small layout fix

[tt-rss.git] / functions.js

var hotkeys_enabled = true;
var debug_mode_enabled = false;
var xmlhttp_rpc = Ajax.getTransport();

/* add method to remove element from array */

Array.prototype.remove = function(s) {
        for (var i=0; i < this.length; i++) {
                if (s == this[i]) this.splice(i, 1);
        }
}

function browser_has_opacity() {
        return navigator.userAgent.match("Gecko") != null || 
                navigator.userAgent.match("Opera") != null;
}

function is_msie() {
        return navigator.userAgent.match("MSIE");
}

function is_opera() {
        return navigator.userAgent.match("Opera");
}

function is_khtml() {
        return navigator.userAgent.match("KHTML");
}

function is_safari() {
        return navigator.userAgent.match("Safari");
}

function exception_error(location, e, silent) {
        var msg;

        if (e.fileName) {
                var base_fname = e.fileName.substring(e.fileName.lastIndexOf("/") + 1);
        
                msg = "Exception: " + e.name + ", " + e.message + 
                        "\nFunction: " + location + "()" +
                        "\nLocation: " + base_fname + ":" + e.lineNumber;
                
        } else {
                msg = "Exception: " + e + "\nFunction: " + location + "()";
        }

        debug("<b>EXCEPTION: " + msg + "</b>");

        if (!silent) {
                alert(msg);
        }
}

function disableHotkeys() {
        hotkeys_enabled = false;
}

function enableHotkeys() {
        hotkeys_enabled = true;
}

function xmlhttp_ready(obj) {
        return obj.readyState == 4 || obj.readyState == 0 || !obj.readyState;
}

function open_article_callback(transport) {
        try {

                if (transport.responseXML) {
                        
                        var link = transport.responseXML.getElementsByTagName("link")[0];
                        var id = transport.responseXML.getElementsByTagName("id")[0];

                        debug("open_article_callback, received link: " + link);

                        if (link) {
                                debug("link url: " + link.firstChild.nodeValue);

                                window.open(link.firstChild.nodeValue, "_blank");

                                if (id) {
                                        id = id.firstChild.nodeValue;
                                        if (!document.getElementById("headlinesList")) {
                                                window.setTimeout("toggleUnread(" + id + ", 0)", 100);
                                        }
                                }
                        } else {
                                notify_error("Can't open article: received invalid article link");
                        }
                } else {
                        notify_error("Can't open article: received invalid XML");
                }

        } catch (e) {
                exception_error("open_article_callback", e);
        }
}

function param_escape(arg) {
        if (typeof encodeURIComponent != 'undefined')
                return encodeURIComponent(arg); 
        else
                return escape(arg);
}

function param_unescape(arg) {
        if (typeof decodeURIComponent != 'undefined')
                return decodeURIComponent(arg); 
        else
                return unescape(arg);
}

function delay(gap) {
        var then,now; 
        then=new Date().getTime();
        now=then;
        while((now-then)<gap) {
                now=new Date().getTime();
        }
}

var notify_hide_timerid = false;

function hide_notify() {
        var n = document.getElementById("notify");
        if (n) {
                n.style.display = "none";
        }
} 

function notify_real(msg, no_hide, n_type) {

        var n = document.getElementById("notify");
        var nb = document.getElementById("notify_body");

        if (!n || !nb) return;

        if (notify_hide_timerid) {
                window.clearTimeout(notify_hide_timerid);
        }

        if (msg == "") {
                if (n.style.display == "block") {
                        notify_hide_timerid = window.setTimeout("hide_notify()", 0);
                }
                return;
        } else {
                n.style.display = "block";
        }

        /* types:

                1 - generic
                2 - progress
                3 - error
                4 - info

        */

        if (typeof __ != 'undefined') {
                msg = __(msg);
        }

        if (n_type == 1) {
                n.className = "notify";
        } else if (n_type == 2) {
                n.className = "notifyProgress";
                msg = "<img src='images/indicator_white.gif'> " + msg;
        } else if (n_type == 3) {
                n.className = "notifyError";
                msg = "<img src='images/sign_excl.gif'> " + msg;
        } else if (n_type == 4) {
                n.className = "notifyInfo";
                msg = "<img src='images/sign_info.gif'> " + msg;
        }

//      msg = "<img src='images/live_com_loading.gif'> " + msg;

        nb.innerHTML = msg;

        if (!no_hide) {
                notify_hide_timerid = window.setTimeout("hide_notify()", 3000);
        }
}

function notify(msg, no_hide) {
        notify_real(msg, no_hide, 1);
}

function notify_progress(msg, no_hide) {
        notify_real(msg, no_hide, 2);
}

function notify_error(msg, no_hide) {
        notify_real(msg, no_hide, 3);

}

function notify_info(msg, no_hide) {
        notify_real(msg, no_hide, 4);
}

function printLockingError() {
        notify_info("Please wait until operation finishes.");
}

function hotkey_handler(e) {

        try {

                var keycode;
                var shift_key = false;

                try {
                        shift_key = e.shiftKey;
                } catch (e) {

                }
        
                if (!hotkeys_enabled) {
                        debug("hotkeys disabled");
                        return;
                }
        
                if (window.event) {
                        keycode = window.event.keyCode;
                } else if (e) {
                        keycode = e.which;
                }

                if (keycode == 82) { // r
                        return scheduleFeedUpdate(true);
                }

                if (keycode == 83) { // s
                        return displayDlg("search", getActiveFeedId());
                }

                if (keycode == 85) { // u
                        if (getActiveFeedId()) {
                                return viewfeed(getActiveFeedId(), "ForceUpdate");
                        }
                }
        
                if (keycode == 65) { // a
                        return toggleDispRead();
                }
        
                var feedlist = document.getElementById('feedList');
        
                if (keycode == 74) { // j
                        var feed = getActiveFeedId();
                        var new_feed = getRelativeFeedId(feedlist, feed, 'prev');
                        if (new_feed) viewfeed(new_feed, '');
                }
        
                if (keycode == 75) { // k
                        var feed = getActiveFeedId();
                        var new_feed = getRelativeFeedId(feedlist, feed, 'next');
                        if (new_feed) viewfeed(new_feed, '');
                }

                if (shift_key && (keycode == 78 || keycode == 40)) { // shift - n, down
                        return catchupRelativeToArticle(1);
                }

                if (shift_key && (keycode == 80 || keycode == 38)) { // shift - p, up
                        return catchupRelativeToArticle(0);                     
                }

                if (keycode == 78 || keycode == 40) { // n, down
                        if (typeof moveToPost != 'undefined') {
                                return moveToPost('next');
                        }
                }
        
                if (keycode == 80 || keycode == 38) { // p, up
                        if (typeof moveToPost != 'undefined') {
                                return moveToPost('prev');
                        }
                }
                
                if (keycode == 68 && shift_key) { // d
                        if (!debug_mode_enabled) {
                                document.getElementById('debug_output').style.display = 'block';
                                debug('debug mode activated');
                        } else {
                                document.getElementById('debug_output').style.display = 'none';
                        }

                        debug_mode_enabled = !debug_mode_enabled;
                }

                if (keycode == 190 && shift_key) { // >
                        viewFeedGoPage(1);
                }
                
                if (keycode == 188 && shift_key) { // <
                        viewFeedGoPage(-1);
                }

                if (keycode == 191 && shift_key) { // ?
                        viewFeedGoPage(0);
                }

                if (keycode == 69 && shift_key) { // e
                        return editFeedDlg(getActiveFeedId());
                }

                if (keycode == 70 && shift_key) { // f
                        if (getActiveFeedId()) {
                                return catchupCurrentFeed();
                        }
                }

                if (keycode == 80 && shift_key) { // p 
                        if (getActiveFeedId()) {
                                return catchupPage();
                        }
                }

                if (keycode == 86) { // v
                        if (getActiveArticleId()) {
                                openArticleInNewWindow(getActiveArticleId());
                        }
                }

                if (keycode == 84) { // t

                        var id = getActiveArticleId();

                        if (id) {                               

                                var cb = document.getElementById("RCHK-" + id);

                                if (cb) {
                                        cb.checked = !cb.checked;
                                        toggleSelectRowById(cb, "RROW-" + id);
                                }
                        }
                }

                if (keycode == 67) { // c
                        var id = getActiveArticleId();

                        if (id) {                               
                                toggleUnread(id, 0);
                        }
                }

                if (keycode == 67 && shift_key) { // c
                        if (typeof collapse_feedlist != 'undefined') {
                                return collapse_feedlist();
                        }
                }

                if (keycode == 81 && shift_key) { // shift + q
                        if (typeof catchupAllFeeds != 'undefined') {
                                return catchupAllFeeds();
                        }
                }

                if (keycode == 73 && shift_key) { // shift + i
                        if (document.getElementById("subtoolbar_search")) {
                                if (Element.visible("subtoolbar_search")) {
                                        Element.hide("subtoolbar_search");
                                        Element.show("subtoolbar_ftitle");
                                        setTimeout("Element.focus('subtoolbar_search_box')", 100);
                                } else {
                                        Element.show("subtoolbar_search");
                                        Element.hide("subtoolbar_ftitle");
                                }
                        }
                }

                if (typeof localHotkeyHandler != 'undefined') {
                        try {
                                return localHotkeyHandler(e);
                        } catch (e) {
                                exception_error("hotkey_handler, local:", e);
                        }
                }

                debug("KP=" + keycode);
        } catch (e) {
                exception_error("hotkey_handler", e);
        }
}

function cleanSelectedList(element) {
        var content = document.getElementById(element);

        if (!document.getElementById("feedCatHolder")) {
                for (i = 0; i < content.childNodes.length; i++) {
                        var child = content.childNodes[i];
                        try {
                                child.className = child.className.replace("Selected", "");
                        } catch (e) {
                                //
                        }
                }
        } else {
                for (i = 0; i < content.childNodes.length; i++) {
                        var child = content.childNodes[i];
                        if (child.id == "feedCatHolder") {
                                debug(child.id);
                                var fcat = child.lastChild;
                                for (j = 0; j < fcat.childNodes.length; j++) {
                                        var feed = fcat.childNodes[j];
                                        feed.className = feed.className.replace("Selected", "");
                                }               
                        }
                } 
        }
}


function cleanSelected(element) {
        var content = document.getElementById(element);

        for (i = 0; i < content.rows.length; i++) {
                content.rows[i].className = content.rows[i].className.replace("Selected", "");
        }
}

function getVisibleUnreadHeadlines() {
        var content = document.getElementById("headlinesList");

        var rows = new Array();

        for (i = 0; i < content.rows.length; i++) {
                var row_id = content.rows[i].id.replace("RROW-", "");
                if (row_id.length > 0 && content.rows[i].className.match("Unread")) {
                                rows.push(row_id);      
                }
        }
        return rows;
}

function getVisibleHeadlineIds() {

        var content = document.getElementById("headlinesList");

        var rows = new Array();

        for (i = 0; i < content.rows.length; i++) {
                var row_id = content.rows[i].id.replace("RROW-", "");
                if (row_id.length > 0) {
                                rows.push(row_id);      
                }
        }
        return rows;
}

function getFirstVisibleHeadlineId() {
        var rows = getVisibleHeadlineIds();
        return rows[0];
}

function getLastVisibleHeadlineId() {
        var rows = getVisibleHeadlineIds();
        return rows[rows.length-1];
}

function markHeadline(id) {
        var row = document.getElementById("RROW-" + id);
        if (row) {
                var is_active = false;
        
                if (row.className.match("Active")) {
                        is_active = true;
                }
                row.className = row.className.replace("Selected", "");
                row.className = row.className.replace("Active", "");
                row.className = row.className.replace("Insensitive", "");
                
                if (is_active) {
                        row.className = row.className = "Active";
                }
                
                var check = document.getElementById("RCHK-" + id);

                if (check) {
                        check.checked = true;
                }

                row.className = row.className + "Selected"; 
                
        }
}

function getFeedIds() {
        var content = document.getElementById("feedsList");

        var rows = new Array();

        for (i = 0; i < content.rows.length; i++) {
                var id = content.rows[i].id.replace("FEEDR-", "");
                if (id.length > 0) {
                        rows.push(id);
                }
        }

        return rows;
}

function setCookie(name, value, lifetime, path, domain, secure) {
        
        var d = false;
        
        if (lifetime) {
                d = new Date();
                d.setTime(d.getTime() + (lifetime * 1000));
        }

        debug("setCookie: " + name + " => " + value + ": " + d);
        
        int_setCookie(name, value, d, path, domain, secure);

}

function int_setCookie(name, value, expires, path, domain, secure) {
        document.cookie= name + "=" + escape(value) +
                ((expires) ? "; expires=" + expires.toGMTString() : "") +
                ((path) ? "; path=" + path : "") +
                ((domain) ? "; domain=" + domain : "") +
                ((secure) ? "; secure" : "");
}

function delCookie(name, path, domain) {
        if (getCookie(name)) {
                document.cookie = name + "=" +
                ((path) ? ";path=" + path : "") +
                ((domain) ? ";domain=" + domain : "" ) +
                ";expires=Thu, 01-Jan-1970 00:00:01 GMT";
        }
}
                

function getCookie(name) {

        var dc = document.cookie;
        var prefix = name + "=";
        var begin = dc.indexOf("; " + prefix);
        if (begin == -1) {
            begin = dc.indexOf(prefix);
            if (begin != 0) return null;
        }
        else {
            begin += 2;
        }
        var end = document.cookie.indexOf(";", begin);
        if (end == -1) {
            end = dc.length;
        }
        return unescape(dc.substring(begin + prefix.length, end));
}

function disableContainerChildren(id, disable, doc) {

        if (!doc) doc = document;

        var container = doc.getElementById(id);

        if (!container) {
                //alert("disableContainerChildren: element " + id + " not found");
                return;
        }

        for (var i = 0; i < container.childNodes.length; i++) {
                var child = container.childNodes[i];

                try {
                        child.disabled = disable;
                } catch (E) {

                }

                if (disable) {
                        if (child.className && child.className.match("button")) {
                                child.className = "disabledButton";
                        }
                } else {
                        if (child.className && child.className.match("disabledButton")) {
                                child.className = "button";
                        }
                } 
        }

}

function gotoPreferences() {
        document.location.href = "prefs.php";
}

function gotoMain() {
        document.location.href = "tt-rss.php";
}

function gotoExportOpml() {
        document.location.href = "opml.php?op=Export";
}

function getActiveFeedId() {
//      return getCookie("ttrss_vf_actfeed");
        try {
                debug("gAFID: " + active_feed_id);
                return active_feed_id;
        } catch (e) {
                exception_error("getActiveFeedId", e);
        }
}

function activeFeedIsCat() {
        return active_feed_is_cat;
}

function setActiveFeedId(id) {
//      return setCookie("ttrss_vf_actfeed", id);
        try {
                debug("sAFID(" + id + ")");
                active_feed_id = id;
        } catch (e) {
                exception_error("setActiveFeedId", e);
        }
}

function parse_counters(reply, scheduled_call) {
        try {

                var feeds_found = 0;

                var elems = reply.getElementsByTagName("counter");

                for (var l = 0; l < elems.length; l++) {

                        var id = elems[l].getAttribute("id");
                        var t = elems[l].getAttribute("type");
                        var ctr = elems[l].getAttribute("counter");
                        var error = elems[l].getAttribute("error");
                        var has_img = elems[l].getAttribute("hi");
                        var updated = elems[l].getAttribute("updated");
                        var title = elems[l].getAttribute("title");
                
                        if (id == "global-unread") {
                                global_unread = ctr;
                                updateTitle();
                                continue;
                        }

                        if (id == "subscribed-feeds") {
                                feeds_found = ctr;
                                continue;
                        }
        
                        if (t == "category") {
                                var catctr = document.getElementById("FCATCTR-" + id);
                                if (catctr) {
                                        catctr.innerHTML = "(" + ctr + ")";
                                        if (ctr > 0) {
                                                catctr.className = "catCtrHasUnread";
                                        } else {
                                                catctr.className = "catCtrNoUnread";
                                        }
                                }
                                continue;
                        }
                
                        var feedctr = document.getElementById("FEEDCTR-" + id);
                        var feedu = document.getElementById("FEEDU-" + id);
                        var feedr = document.getElementById("FEEDR-" + id);
                        var feed_img = document.getElementById("FIMG-" + id);
                        var feedlink = document.getElementById("FEEDL-" + id);
                        var feedupd = document.getElementById("FLUPD-" + id);

                        if (updated && feedlink) {
                                if (error) {
                                        feedlink.title = "Error: " + error + " (" + updated + ")";
                                } else {
                                        feedlink.title = "Updated: " + updated;
                                }
                        }

                        if (updated && feedupd) {
                                if (error) {
                                        feedupd.innerHTML = updated + " (Error)";
                                } else {
                                        feedupd.innerHTML = updated;
                                }
                        }

                        if (has_img && feed_img && !is_msie()) {
                                if (!feed_img.src.match(id + ".ico")) {
                                        feed_img.src = getInitParam("icons_location") + "/" + id + ".ico";
                                }
                        }

                        if (feedlink && title) {
                                feedlink.innerHTML = title;
                        }

                        if (feedctr && feedu && feedr) {

                                if (feedu.innerHTML != ctr && id == getActiveFeedId() && scheduled_call) {
                                        viewCurrentFeed();
                                }

                                var row_needs_hl = (ctr > 0 && ctr > parseInt(feedu.innerHTML));

                                feedu.innerHTML = ctr;

                                if (error) {
                                        feedr.className = feedr.className.replace("feed", "error");
                                } else if (id > 0) {
                                        feedr.className = feedr.className.replace("error", "feed");
                                }
        
                                if (ctr > 0) {                                  
                                        feedctr.className = "odd";
                                        if (!feedr.className.match("Unread")) {
                                                var is_selected = feedr.className.match("Selected");
                
                                                feedr.className = feedr.className.replace("Selected", "");
                                                feedr.className = feedr.className.replace("Unread", "");
                
                                                feedr.className = feedr.className + "Unread";
                
                                                if (is_selected) {
                                                        feedr.className = feedr.className + "Selected";
                                                }       
                                                
                                        }

                                        if (row_needs_hl) { 
                                                new Effect.Highlight(feedr, {duration: 1, startcolor: "#fff7d5",
                                                        queue: { position:'end', scope: 'EFQ-' + id, limit: 1 } } );
                                        }
                                } else {
                                        feedctr.className = "invisible";
                                        feedr.className = feedr.className.replace("Unread", "");
                                }                       
                        }
                }

                hideOrShowFeeds(document, getInitParam("hide_read_feeds") == 1);

                var feeds_stored = number_of_feeds;

                debug("Feed counters, C: " + feeds_found + ", S:" + feeds_stored);

                if (feeds_stored != feeds_found) {
                        number_of_feeds = feeds_found;

                        if (feeds_stored != 0 && feeds_found != 0) {
                                debug("Subscribed feed number changed, refreshing feedlist");
                                setTimeout('updateFeedList(false, false)', 50);
                        }
                }

        } catch (e) {
                exception_error("parse_counters", e);
        }
}

function parse_counters_reply(transport, scheduled_call) {

        if (!transport.responseXML) {
                notify_error("Backend did not return valid XML", true);
                return;
        }

        var reply = transport.responseXML.firstChild;
        
        if (!reply) {
                notify_error("Backend did not return expected XML object", true);
                updateTitle("");
                return;
        } 
        
        var error_code = false;
        var error_msg = false;

        if (reply.firstChild) {
                error_code = reply.firstChild.getAttribute("error-code");
                error_msg = reply.firstChild.getAttribute("error-msg");
        }

        if (!error_code) {      
                error_code = reply.getAttribute("error-code");
                error_msg = reply.getAttribute("error-msg");
        }
        
        if (error_code && error_code != 0) {
                debug("refetch_callback: got error code " + error_code);
                return fatalError(error_code, error_msg);
        }

        var counters = reply.getElementsByTagName("counters")[0];
        
        parse_counters(counters, scheduled_call);

        var runtime_info = reply.getElementsByTagName("runtime-info")[0];

        parse_runtime_info(runtime_info);

        if (getInitParam("feeds_sort_by_unread") == 1) {
                        resort_feedlist();              
        }       

        hideOrShowFeeds(document, getInitParam("hide_read_feeds") == 1);

}

function all_counters_callback2(transport) {
        try {
                debug("<b>all_counters_callback2 IN: " + transport + "</b>");
                parse_counters_reply(transport);
                debug("<b>all_counters_callback2 OUT: " + transport + "</b>");

        } catch (e) {
                exception_error("all_counters_callback2", e);
        }
}

function get_feed_unread(id) {
        try {
                return parseInt(document.getElementById("FEEDU-" + id).innerHTML);      
        } catch (e) {
                exception_error("get_feed_unread", e, true);
                return -1;
        }
}

function get_feed_entry_unread(doc, elem) {

        var id = elem.id.replace("FEEDR-", "");

        if (id <= 0) {
                return -1;
        }

        try {
                return parseInt(doc.getElementById("FEEDU-" + id).innerHTML);   
        } catch (e) {
                return -1;
        }
}

function resort_category(doc, node) {
        debug("resort_category: " + node);

        if (node.hasChildNodes() && node.firstChild.nextSibling != false) {  
                for (i = 0; i < node.childNodes.length; i++) {
                        if (node.childNodes[i].nodeName != "LI") { continue; }

                        if (get_feed_entry_unread(doc, node.childNodes[i]) < 0) {
                                continue;
                        }

                        for (j = i+1; j < node.childNodes.length; j++) {                        
                                if (node.childNodes[j].nodeName != "LI") { continue; }  

                                var tmp_val = get_feed_entry_unread(doc, node.childNodes[i]);
                                var cur_val = get_feed_entry_unread(doc, node.childNodes[j]);

                                if (cur_val > tmp_val) {
                                        tempnode_i = node.childNodes[i].cloneNode(true);
                                        tempnode_j = node.childNodes[j].cloneNode(true);
                                        node.replaceChild(tempnode_i, node.childNodes[j]);
                                        node.replaceChild(tempnode_j, node.childNodes[i]);
                                }
                        }

                }
        }

}

function resort_feedlist() {
        debug("resort_feedlist");

        var fd = document;

        if (fd.getElementById("feedCatHolder")) {

                var feeds = fd.getElementById("feedList");
                var child = feeds.firstChild;

                while (child) {

                        if (child.id == "feedCatHolder") {
                                resort_category(fd, child.firstChild);
                        }
        
                        child = child.nextSibling;
                }

        } else {
                resort_category(fd, fd.getElementById("feedList"));
        }
}

/** * @(#)isNumeric.js * * Copyright (c) 2000 by Sundar Dorai-Raj
  * * @author Sundar Dorai-Raj
  * * Email: sdoraira@vt.edu
  * * This program is free software; you can redistribute it and/or
  * * modify it under the terms of the GNU General Public License 
  * * as published by the Free Software Foundation; either version 2 
  * * of the License, or (at your option) any later version, 
  * * provided that any use properly credits the author. 
  * * This program is distributed in the hope that it will be useful,
  * * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  * * GNU General Public License for more details at http://www.gnu.org * * */

  var numbers=".0123456789";
  function isNumeric(x) {
    // is x a String or a character?
    if(x.length>1) {
      // remove negative sign
      x=Math.abs(x)+"";
      for(j=0;j<x.length;j++) {
        // call isNumeric recursively for each character
        number=isNumeric(x.substring(j,j+1));
        if(!number) return number;
      }
      return number;
    }
    else {
      // if x is number return true
      if(numbers.indexOf(x)>=0) return true;
      return false;
    }
  }


function hideOrShowFeeds(doc, hide) {

        debug("hideOrShowFeeds: " + doc + ", " + hide);

        var fd = document;

        var list = fd.getElementById("feedList");

        if (fd.getElementById("feedCatHolder")) {

                var feeds = fd.getElementById("feedList");
                var child = feeds.firstChild;

                while (child) {

                        if (child.id == "feedCatHolder") {
                                hideOrShowFeedsCategory(fd, child.firstChild, hide, child.previousSibling);
                        }
        
                        child = child.nextSibling;
                }

        } else {
                hideOrShowFeedsCategory(fd, fd.getElementById("feedList"), hide);
        }
}

function hideOrShowFeedsCategory(doc, node, hide, cat_node) {

//      debug("hideOrShowFeedsCategory: " + node + " (" + hide + ")");

        var cat_unread = 0;

        if (!node) {
                debug("hideOrShowFeeds: passed node is null, aborting");
                return;
        }

//      debug("cat: " + node.id);

        if (node.hasChildNodes() && node.firstChild.nextSibling != false) {  
                for (i = 0; i < node.childNodes.length; i++) {
                        if (node.childNodes[i].nodeName != "LI") { continue; }

                        if (node.childNodes[i].style != undefined) {

                                var has_unread = (node.childNodes[i].className != "feed" &&
                                        node.childNodes[i].className != "label" && 
                                        !(!getInitParam("hide_read_shows_special") && 
                                                node.childNodes[i].className == "virt") && 
                                        node.childNodes[i].className != "error" && 
                                        node.childNodes[i].className != "tag");
        
//                              debug(node.childNodes[i].id + " --> " + has_unread);
        
                                if (hide && !has_unread) {
                                        //node.childNodes[i].style.display = "none";
                                        var id = node.childNodes[i].id;
                                        Effect.Fade(node.childNodes[i], {duration : 0.3, 
                                                queue: { position: 'end', scope: 'FFADE-' + id, limit: 1 }});
                                }
        
                                if (!hide) {
                                        node.childNodes[i].style.display = "list-item";
                                        //Effect.Appear(node.childNodes[i], {duration : 0.3});
                                }
        
                                if (has_unread) {
                                        node.childNodes[i].style.display = "list-item";
                                        cat_unread++;
                                        //Effect.Appear(node.childNodes[i], {duration : 0.3});
                                        //Effect.Highlight(node.childNodes[i]);
                                }
                        }
                }
        }       

//      debug("end cat: " + node.id + " unread " + cat_unread);

        if (cat_unread == 0) {
                if (cat_node.style == undefined) {
                        debug("ERROR: supplied cat_node " + cat_node + 
                                " has no styles. WTF?");
                        return;
                }
                if (hide) {
                        //cat_node.style.display = "none";
                        Effect.Fade(cat_node, {duration : 0.3, 
                                queue: { position: 'end', scope: 'CFADE-' + node.id, limit: 1 }});
                } else {
                        cat_node.style.display = "list-item";
                }
        } else {
                try {
                        cat_node.style.display = "list-item";
                } catch (e) {
                        debug(e);
                }
        }

//      debug("unread for category: " + cat_unread);
}

function selectTableRow(r, do_select) {
        r.className = r.className.replace("Selected", "");
        
        if (do_select) {
                r.className = r.className + "Selected";
        }
}

function selectTableRowById(elem_id, check_id, do_select) {

        try {

                var row = document.getElementById(elem_id);

                if (row) {
                        selectTableRow(row, do_select);
                }               

                var check = document.getElementById(check_id);

                if (check) {
                        check.checked = do_select;
                }
        } catch (e) {
                exception_error("selectTableRowById", e);
        }
}

function selectTableRowsByIdPrefix(content_id, prefix, check_prefix, do_select, 
        classcheck, reset_others) {

        var content = document.getElementById(content_id);

        if (!content) {
                alert("[selectTableRows] Element " + content_id + " not found.");
                return;
        }

        for (i = 0; i < content.rows.length; i++) {
                if (Element.visible(content.rows[i])) {
                        if (!classcheck || content.rows[i].className.match(classcheck)) {
                
                                if (content.rows[i].id.match(prefix)) {
                                        selectTableRow(content.rows[i], do_select);
                                
                                        var row_id = content.rows[i].id.replace(prefix, "");
                                        var check = document.getElementById(check_prefix + row_id);
        
                                        if (check) {
                                                check.checked = do_select;
                                        }
                                } else if (reset_others) {
                                        selectTableRow(content.rows[i], false);
        
                                        var row_id = content.rows[i].id.replace(prefix, "");
                                        var check = document.getElementById(check_prefix + row_id);
        
                                        if (check) {
                                                check.checked = false;
                                        }
        
                                }
                        } else if (reset_others) {
                                selectTableRow(content.rows[i], false);
        
                                var row_id = content.rows[i].id.replace(prefix, "");
                                var check = document.getElementById(check_prefix + row_id);
        
                                if (check) {
                                        check.checked = false;
                                }
        
                        }
                }
        }
}

function getSelectedTableRowIds(content_id, prefix) {

        var content = document.getElementById(content_id);

        if (!content) {
                alert("[getSelectedTableRowIds] Element " + content_id + " not found.");
                return;
        }

        var sel_rows = new Array();

        for (i = 0; i < content.rows.length; i++) {
                if (content.rows[i].id.match(prefix) && 
                                content.rows[i].className.match("Selected")) {
                                
                        var row_id = content.rows[i].id.replace(prefix + "-", "");
                        sel_rows.push(row_id);  
                }
        }

        return sel_rows;

}

function toggleSelectRowById(sender, id) {
        var row = document.getElementById(id);

        if (sender.checked) {
                if (!row.className.match("Selected")) {
                        row.className = row.className + "Selected";
                }
        } else {
                if (row.className.match("Selected")) {
                        row.className = row.className.replace("Selected", "");
                }
        }
}

function toggleSelectListRow(sender) {
        var parent_row = sender.parentNode;

        if (sender.checked) {
                if (!parent_row.className.match("Selected")) {
                        parent_row.className = parent_row.className + "Selected";
                }
        } else {
                if (parent_row.className.match("Selected")) {
                        parent_row.className = parent_row.className.replace("Selected", "");
                }
        }
}

function tSR(sender) {
        return toggleSelectRow(sender);
}

function toggleSelectRow(sender) {
        var parent_row = sender.parentNode.parentNode;

        if (sender.checked) {
                if (!parent_row.className.match("Selected")) {
                        parent_row.className = parent_row.className + "Selected";
                }
        } else {
                if (parent_row.className.match("Selected")) {
                        parent_row.className = parent_row.className.replace("Selected", "");
                }
        }
}

function getRelativeFeedId(list, id, direction, unread_only) {  
        var rows = list.getElementsByTagName("LI");
        var feeds = new Array();

        for (var i = 0; i < rows.length; i++) {
                if (rows[i].id.match("FEEDR-")) {

                        if (rows[i].id == "FEEDR-" + id || (Element.visible(rows[i]) && Element.visible(rows[i].parentNode))) {

                                if (!unread_only || 
                                                (rows[i].className.match("Unread") || rows[i].id == "FEEDR-" + id)) {
                                        feeds.push(rows[i].id.replace("FEEDR-", ""));
                                }
                        }
                }
        }

        if (!id) {
                if (direction == "next") {
                        return feeds.shift();
                } else {
                        return feeds.pop();
                }
        } else {
                if (direction == "next") {
                        var idx = feeds.indexOf(id);
                        if (idx != -1 && idx < feeds.length) {
                                return feeds[idx+1];                                    
                        } else {
                                return getRelativeFeedId(list, false, direction, unread_only);
                        }
                } else {
                        var idx = feeds.indexOf(id);
                        if (idx > 0) {
                                return feeds[idx-1];
                        } else {
                                return getRelativeFeedId(list, false, direction, unread_only);
                        }
                }

        }
}

function showBlockElement(id, h_id) {
        var elem = document.getElementById(id);

        if (elem) {
                elem.style.display = "block";

                if (h_id) {
                        elem = document.getElementById(h_id);
                        if (elem) {
                                elem.style.display = "none";
                        }
                }
        } else {
                alert("[showBlockElement] can't find element with id " + id);
        } 
}

function appearBlockElement_afh(effect) {

}

function checkboxToggleElement(elem, id) {
        if (elem.checked) {
                Effect.SlideDown(id, {duration : 0.5});
        } else {
                Effect.SlideUp(id, {duration : 0.5});
        }
}

function appearBlockElement(id, h_id) {

        try {
                if (h_id) {
                        Effect.Fade(h_id);
                }
                Effect.SlideDown(id, {duration : 1.0, afterFinish: appearBlockElement_afh});
        } catch (e) {
                exception_error("appearBlockElement", e);
        }

}

function hideParentElement(e) {
        e.parentNode.style.display = "none";
}

function dropboxSelect(e, v) {
        for (i = 0; i < e.length; i++) {
                if (e[i].value == v) {
                        e.selectedIndex = i;
                        break;
                }
        }
}

// originally stolen from http://www.11tmr.com/11tmr.nsf/d6plinks/MWHE-695L9Z
// bugfixed just a little bit :-)
function getURLParam(strParamName){
  var strReturn = "";
  var strHref = window.location.href;

  if (strHref.indexOf("#") == strHref.length-1) {
                strHref = strHref.substring(0, strHref.length-1);
  }

  if ( strHref.indexOf("?") > -1 ){
    var strQueryString = strHref.substr(strHref.indexOf("?"));
    var aQueryString = strQueryString.split("&");
    for ( var iParam = 0; iParam < aQueryString.length; iParam++ ){
      if (aQueryString[iParam].indexOf(strParamName + "=") > -1 ){
        var aParam = aQueryString[iParam].split("=");
        strReturn = aParam[1];
        break;
      }
    }
  }
  return strReturn;
} 

function leading_zero(p) {
        var s = String(p);
        if (s.length == 1) s = "0" + s;
        return s;
}

function closeInfoBox(cleanup) {

        if (!is_msie() && !getInitParam("infobox_disable_overlay")) {
                var overlay = document.getElementById("dialog_overlay");
                if (overlay) {
                        overlay.style.display = "none";
                }
        }

        var box = document.getElementById('infoBox');
        var shadow = document.getElementById('infoBoxShadow');

        if (shadow) {
                shadow.style.display = "none";
        } else if (box) {
                box.style.display = "none";
        }

        if (cleanup) box.innerHTML = "&nbsp;";

        enableHotkeys();

        return false;
}


function displayDlg(id, param) {

        notify_progress("Loading, please wait...", true);

        disableHotkeys();

        var query = "backend.php?op=dlg&id=" +
                param_escape(id) + "&param=" + param_escape(param);

        new Ajax.Request(query, {
                onComplete: function (transport) {
                        infobox_callback2(transport);
                } });

        return false;
}

function infobox_submit_callback2(transport) {
        closeInfoBox();

        try {
                // called from prefs, reload tab
                if (active_tab) {
                        selectTab(active_tab, false);
                }
        } catch (e) { }

        if (transport.responseText) {
                notify_info(transport.responseText);
        }
}

function infobox_callback2(transport) {
        try {

                debug("infobox_callback2");

                if (!is_msie() && !getInitParam("infobox_disable_overlay")) {
                        var overlay = document.getElementById("dialog_overlay");
                        if (overlay) {
                                overlay.style.display = "block";
                        }
                }

                var box = document.getElementById('infoBox');
                var shadow = document.getElementById('infoBoxShadow');
                if (box) {                      

/*                              if (!is_safari()) {
                                new Draggable(shadow);
                        } */

                        box.innerHTML=transport.responseText;                   
                        if (shadow) {
                                shadow.style.display = "block";
                        } else {
                                box.style.display = "block";                            
                        }
                }

                /* FIXME this needs to be moved out somewhere */

                if (document.getElementById("tags_choices")) {
                        new Ajax.Autocompleter('tags_str', 'tags_choices',
                                "backend.php?op=rpc&subop=completeTags",
                                { tokens: ',', paramName: "search" });
                }

                notify("");
        } catch (e) {
                exception_error("infobox_callback2", e);
        }
}

function createFilter() {

        var form = document.forms['filter_add_form'];
        var reg_exp = form.reg_exp.value;

        if (reg_exp == "") {
                alert(__("Can't add filter: nothing to match on."));
                return false;
        }

        var query = Form.serialize("filter_add_form");

        new Ajax.Request("backend.php?" + query, {
                onComplete: function (transport) {
                        infobox_submit_callback2(transport);
                } });
        
        return true;
}

function toggleSubmitNotEmpty(e, submit_id) {
        try {
                document.getElementById(submit_id).disabled = (e.value == "")
        } catch (e) {
                exception_error("toggleSubmitNotEmpty", e);
        }
}

function isValidURL(s) {
        return s.match("http://") != null || s.match("https://") != null || s.match("feed://") != null;
}

function subscribeToFeed() {

        var form = document.forms['feed_add_form'];
        var feed_url = form.feed_url.value;

        if (feed_url == "") {
                alert(__("Can't subscribe: no feed URL given."));
                return false;
        }

        notify_progress(__("Subscribing to feed..."), true);

        closeInfoBox();

        var feeds_doc = document;

//      feeds_doc.location.href = "backend.php?op=error&msg=Loading,%20please wait...";
        
        var query = Form.serialize("feed_add_form");
        
        debug("subscribe q: " + query);

        new Ajax.Request("backend.php", {
                parameters: query,
                onComplete: function(transport) { 
                        dlg_frefresh_callback(transport); 
                } });

        return false;
}

function filterCR(e, f)
{
     var key;

     if(window.event)
          key = window.event.keyCode;     //IE
     else
          key = e.which;     //firefox

        if (key == 13) {
                if (typeof f != 'undefined') {
                        f();
                        return false;
                } else {
                        return false;
                }
        } else {
                return true;
        }
}

function getMainContext() {
        return this.window;
}

function getFeedsContext() {
        return this.window;
}

function getContentContext() {
        return this.window;
}

function getHeadlinesContext() {
        return this.window;
}

var debug_last_class = "even";

function debug(msg) {

        if (debug_last_class == "even") {
                debug_last_class = "odd";
        } else {
                debug_last_class = "even";
        }

        var c = document.getElementById('debug_output');
        if (c && c.style.display == "block") {
                while (c.lastChild != 'undefined' && c.childNodes.length > 100) {
                        c.removeChild(c.lastChild);
                }
        
                var d = new Date();
                var ts = leading_zero(d.getHours()) + ":" + leading_zero(d.getMinutes()) +
                        ":" + leading_zero(d.getSeconds());
                c.innerHTML = "<li class=\"" + debug_last_class + "\"><span class=\"debugTS\">[" + ts + "]</span> " + 
                        msg + "</li>" + c.innerHTML;
        }
}

function getInitParam(key) {
        return init_params[key];
}

function storeInitParam(key, value) {
        debug("<b>storeInitParam is OBSOLETE: " + key + " => " + value + "</b>");
        init_params[key] = value;
}

function fatalError(code, message) {
        try {   

                if (code == 6) {
                        window.location.href = "tt-rss.php";                    
                } else if (code == 5) {
                        window.location.href = "update.php";
                } else {
                        var fe = document.getElementById("fatal_error");
                        var fc = document.getElementById("fatal_error_msg");
        
                        if (message == "") message = "Unknown error";

                        fc.innerHTML = "<img src='images/sign_excl.gif'> " + message + " (Code " + code + ")";
        
                        fe.style.display = "block";
                }

        } catch (e) {
                exception_error("fatalError", e);
        }
}

function getFeedName(id, is_cat) {      
        var d = getFeedsContext().document;

        var e;

        if (is_cat) {
                e = d.getElementById("FCATN-" + id);
        } else {
                e = d.getElementById("FEEDN-" + id);
        }
        if (e) {
                return e.innerHTML.stripTags();
        } else {
                return null;
        }
}

function viewContentUrl(url) {
        getContentContext().location = url;
}

function filterDlgCheckAction(sender) {

        try {

                var action = sender[sender.selectedIndex].value;

                var form = document.forms["filter_add_form"];
        
                if (!form) {
                        form = document.forms["filter_edit_form"];
                }

                if (!form) {
                        debug("filterDlgCheckAction: can't find form!");
                        return;
                }

                var action_param = form.action_param;

                if (!action_param) {
                        debug("filterDlgCheckAction: can't find action param!");
                        return;
                }

                // if selected action supports parameters, enable params field
                if (action == 4 || action == 6) {
                        action_param.disabled = false;
                } else {
                        action_param.disabled = true;
                }

        } catch (e) {
                exception_error(e, "filterDlgCheckAction");
        }

}

function explainError(code) {
        return displayDlg("explainError", code);
}

// this only searches loaded headlines list, not in CDM
function getRelativePostIds(id) {

        debug("getRelativePostIds: " + id);

        var ids = new Array();
        var container = document.getElementById("headlinesList");

        if (container) {
                var rows = container.rows;

                for (var i = 0; i < rows.length; i++) {
                        var r_id = rows[i].id.replace("RROW-", "");

                        if (r_id == id) {
                                if (i > 0) ids.push(rows[i-1].id.replace("RROW-", ""));
                                if (i > 1) ids.push(rows[i-2].id.replace("RROW-", ""));
                                if (i > 2) ids.push(rows[i-3].id.replace("RROW-", ""));

                                if (i < rows.length-1) ids.push(rows[i+1].id.replace("RROW-", ""));
                                if (i < rows.length-2) ids.push(rows[i+2].id.replace("RROW-", ""));
                                if (i < rows.length-3) ids.push(rows[i+3].id.replace("RROW-", ""));

                                return ids;
                        }
                }
        }

        return false;
}

function openArticleInNewWindow(id) {
        try {
                debug("openArticleInNewWindow: " + id);

                var query = "backend.php?op=rpc&subop=getArticleLink&id=" + id;

                debug(query);

                new Ajax.Request(query, {
                        onComplete: function(transport) { 
                                open_article_callback(transport); 
                        } });


        } catch (e) {
                exception_error("openArticleInNewWindow", e);
        }
}

/* http://textsnippets.com/posts/show/835 */

Position.GetWindowSize = function(w) {
        w = w ? w : window;
        var width = w.innerWidth || (w.document.documentElement.clientWidth || w.document.body.clientWidth);
        var height = w.innerHeight || (w.document.documentElement.clientHeight || w.document.body.clientHeight);
        return [width, height]
}

/* http://textsnippets.com/posts/show/836 */

Position.Center = function(element, parent) {
        var w, h, pw, ph;
        var d = Element.getDimensions(element);
        w = d.width;
        h = d.height;
        Position.prepare();
        if (!parent) {
                var ws = Position.GetWindowSize();
                pw = ws[0];
                ph = ws[1];
        } else {
                pw = parent.offsetWidth;
                ph = parent.offsetHeight;
        }
        element.style.top = (ph/2) - (h/2) -  Position.deltaY + "px";
        element.style.left = (pw/2) - (w/2) -  Position.deltaX + "px";
}


function labeltest_callback(transport) {
        try {
                var container = document.getElementById('label_test_result');
        
                container.innerHTML = transport.responseText;
                if (!Element.visible(container)) {
                        Effect.SlideDown(container, { duration : 0.5 });
                }

                notify("");
        } catch (e) {
                exception_error("labeltest_callback", e);
        }
}

function labelTest() {

        try {
                var container = document.getElementById('label_test_result');
        
                var form = document.forms['label_edit_form'];
        
                var sql_exp = form.sql_exp.value;
                var description = form.description.value;
        
                notify_progress("Loading, please wait...");
        
                var query = "backend.php?op=pref-labels&subop=test&expr=" +
                        param_escape(sql_exp) + "&descr=" + param_escape(description);
        
                new Ajax.Request(query, {
                        onComplete: function (transport) {
                                labeltest_callback(transport);
                        } });
        
                return false;

        } catch (e) {
                exception_error("labelTest", e);
        }
}

function isCdmMode() {
        return !document.getElementById("headlinesList");
}

function getSelectedArticleIds2() {
        var rows = new Array();
        var cdm_mode = isCdmMode();

        if (cdm_mode) {
                rows = cdmGetSelectedArticles();
        } else {        
                rows = getSelectedTableRowIds("headlinesList", "RROW", "RCHK");
        }

        var ids = new Array();

        for (var i = 0; i < rows.length; i++) {
                var chk = document.getElementById("RCHK-" + rows[i]);
                if (chk && chk.checked) {
                        ids.push(rows[i]);
                }
        }

        return ids;
}

function displayHelpInfobox(topic_id) {

        var url = "backend.php?op=help&tid=" + param_escape(topic_id);

        var w = window.open(url, "ttrss_help", 
                "status=0,toolbar=0,location=0,width=450,height=500,scrollbars=1,menubar=0");

        return false;
}