htdocs/javascript/ajax.js

   1 /***************************************************************************
   2  *  Copyright (C) 2003-2007 Polytechnique.org                              *
   3  *  http://opensource.polytechnique.org/                                   *
   4  *                                                                         *
   5  *  This program is free software; you can redistribute it and/or modify   *
   6  *  it under the terms of the GNU General Public License as published by   *
   7  *  the Free Software Foundation; either version 2 of the License, or      *
   8  *  (at your option) any later version.                                    *
   9  *                                                                         *
  10  *  This program is distributed in the hope that it will be useful,        *
  11  *  but WITHOUT ANY WARRANTY; without even the implied warranty of         *
  12  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the          *
  13  *  GNU General Public License for more details.                           *
  14  *                                                                         *
  15  *  You should have received a copy of the GNU General Public License      *
  16  *  along with this program; if not, write to the Free Software            *
  17  *  Foundation, Inc.,                                                      *
  18  *  59 Temple Place, Suite 330, Boston, MA  02111-1307  USA                *
  19  ***************************************************************************/
  20
  21 function AjaxEngine()
  22 {
  23     this.xml_client = null;
  24     this.init = false;
  25     this.obj  = null;
  26     this.func = null;
  27
  28     this.prepare_client = function()
  29     {
  30         if (!this.init) {
  31             if (window.XMLHttpRequest) {
  32                 this.xml_client = new XMLHttpRequest();
  33             } else if (window.ActiveXObject) {
  34                 try {
  35                     this.xml_client = new ActiveXObject("Msxml2.XMLHTTP");
  36                 } catch (e) {
  37                     this.xml_client = new ActiveXObject("Microsoft.XMLHTTP");
  38                 }
  39             }
  40             if (this.xml_client == null) {
  41                 alert("Ton client ne supporte pas Ajax, nécessaire pour certaines fonctionalités de cette page");
  42             }
  43         }
  44         this.init = true;
  45     }
  46
  47     this.update_html = function(obj, src, func)
  48     {
  49         this.prepare_client();
  50         if (this.xml_client == null) {
  51             return true;
  52         }
  53         this.obj = obj;
  54         this.func = func;
  55         this.xml_client.abort();
  56         this.xml_client.onreadystatechange = this.apply_update_html(this);
  57         this.xml_client.open ('GET', src, true);
  58         this.xml_client.send (null);
  59         return false;
  60     }
  61
  62     this.apply_update_html = function(ajax)
  63     {
  64         return function()
  65         {
  66             if(ajax.xml_client.readyState == 4) {
  67                 if (ajax.xml_client.status == 200) {
  68                     if (ajax.obj != null) {
  69                         document.getElementById(ajax.obj).innerHTML = ajax.xml_client.responseText;
  70                     }
  71                     if (ajax.func != null) {
  72                         ajax.func(ajax.xml_client.responseText);
  73                     }
  74                 } else if (ajax.xml_client.status == 403) {
  75                     window.location.reload();
  76                 }
  77             }
  78         };
  79     }
  80 }
  81
  82 var Ajax = new AjaxEngine();
  83
  84 var currentTempMessage = 0;
  85 function setOpacity(obj, opacity)
  86 {
  87   opacity = (opacity == 100)?99:opacity;
  88   // IE
  89   obj.style.filter = "alpha(opacity:"+opacity+")";
  90   // Safari < 1.2, Konqueror
  91   obj.style.KHTMLOpacity = opacity/100;
  92   // Old Mozilla
  93   obj.style.MozOpacity = opacity/100;
  94   // Safari >= 1.2, Firefox and Mozilla, CSS3
  95   obj.style.opacity = opacity/100
  96 }
  97
  98 function _showTempMessage(id, state, back)
  99 {
 100     var obj = document.getElementById(id);
 101     if (currentTempMessage != state) {
 102         return;
 103     }
 104     setOpacity(obj, back * 4);
 105     if (back > 0) {
 106         setTimeout("_showTempMessage('" + id + "', " + currentTempMessage + "," + (back-1) + ")", 125);
 107     } else {
 108         obj.innerHTML = "";
 109     }
 110 }
 111
 112 function showTempMessage(id, message, success)
 113 {
 114     var obj = document.getElementById(id);
 115     obj.innerHTML = (success ? "<img src='images/icons/wand.gif' alt='' /> "
 116                              : "<img src='images/icons/error.gif' alt='' /> ") + message;
 117     obj.style.fontWeight = "bold";
 118     obj.style.color = (success ? "green" : "red");;
 119     currentTempMessage++;
 120     setOpacity(obj, 100);
 121     setTimeout("_showTempMessage('" + id + "', " + currentTempMessage + ", 25)", 1000);
 122 }
 123
 124 function previewWiki(idFrom, idTo, withTitle, idShow)
 125 {
 126     var text = encodeURIComponent(document.getElementById(idFrom).value);
 127     if (text == "") {
 128         return false;
 129     }
 130     var url  = "wiki_preview";
 131     if (!withTitle) {
 132         url += "/notitle";
 133     }
 134     Ajax.update_html(idTo, url + "?text=" + text);
 135     if (idShow != null) {
 136         document.getElementById(idShow).style.display = "";
 137     }
 138 }
 139
 140 // vim:set et sw=4 sts=4 sws=4 foldmethod=marker enc=utf-8: