[Sommaire] [Imprimer]

   1  /*
   2      Copyright 2005 Rolando Gonzalez (rolosworld@gmail.com)
   3  
   4      This program is free software; you can redistribute it and/or modify
   5      it under the terms of the GNU General Public License as published by
   6      the Free Software Foundation; either version 2 of the License, or
   7      (at your option) any later version.
   8  
   9      This program is distributed in the hope that it will be useful,
  10      but WITHOUT ANY WARRANTY; without even the implied warranty of
  11      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12      GNU General Public License for more details.
  13  
  14      You should have received a copy of the GNU General Public License
  15      along with this program; if not, write to the Free Software
  16      Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  17  */
  18  
  19  function getRequester()
  20  {
  21    try
  22      {
  23        if(window.XMLHttpRequest) 
  24          {
  25            return new XMLHttpRequest();
  26          } 
  27        else if(window.ActiveXObject)
  28          {
  29            return new ActiveXObject("Microsoft.XMLHTTP");
  30          }
  31      }
  32    catch (e) 
  33      {
  34        alert("You need a browser which supports an XMLHttpRequest Object.\nMozilla build 0.9.5 has this Object and IE5 and above.");
  35      }
  36  };
  37  
  38  /*
  39  onreadystatechange    Event handler for an event that fires at every state change
  40  readyState    Object status integer:
  41  0 = uninitialized
  42  1 = loading
  43  2 = loaded
  44  3 = interactive
  45  4 = complete
  46  responseText    String version of data returned from server process
  47  responseXML    DOM-compatible document object of data returned from server process
  48  status    Numeric code returned by server, such as 404 for "Not Found" or 200 for "OK"
  49  statusText    String message accompanying the status code
  50  */
  51  function Ajax(cb)
  52  {
  53    var me = this;
  54    this.requester = getRequester();
  55    
  56    if(cb)
  57      this.callback = cb;
  58    else
  59      this.callback = function(req)
  60      {
  61        return eval(req.responseText);
  62      };
  63  
  64    this.requester.onreadystatechange = function(){
  65      switch(me.requester.readyState)
  66      {
  67        case 1:
  68        case 2:
  69        case 3:
  70          break;
  71        case 4:
  72          var response = me.callback(me.requester);
  73          break;
  74        default:
  75          alert("Error");
  76          break;
  77      }
  78    };
  79  
  80    this.state = function()
  81    {
  82      return me.requester.readyState;
  83    };
  84  
  85    this.process = function(url, parameters){
  86      me.requester.open("POST", url, true);
  87      me.requester.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
  88      me.requester.setRequestHeader("Content-length", parameters.length);
  89      //me.requester.setRequestHeader("Connection", "close");
  90      me.requester.send(parameters);
  91    };
  92  };