themes/base/htdocs/luci-static/resources/xhr.js

   1 /*
   2  * xhr.js - XMLHttpRequest helper class
   3  * (c) 2008-2010 Jo-Philipp Wich
   4  */
   5
   6 XHR = function()
   7 {
   8         this.reinit = function()
   9         {
  10                 if( window.XMLHttpRequest ) {
  11                         this._xmlHttp = new XMLHttpRequest();
  12                 }
  13                 else if( window.ActiveXObject ) {
  14                         this._xmlHttp = new ActiveXObject("Microsoft.XMLHTTP");
  15                 }
  16                 else {
  17                         alert("xhr.js: XMLHttpRequest is not supported by this browser!");
  18                 }
  19         }
  20
  21         this.busy = function() {
  22                 switch( this._xmlHttp.readyState )
  23                 {
  24                         case 1:
  25                         case 2:
  26                         case 3:
  27                                 return true;
  28
  29                         default:
  30                                 return false;
  31                 }
  32         }
  33
  34         this.abort = function() {
  35                 if( this.busy() )
  36                         this._xmlHttp.abort();
  37         }
  38
  39         this.get = function(url,data,callback)
  40         {
  41                 this.reinit();
  42
  43                 var xhr  = this._xmlHttp;
  44                 var code = this._encode( data );
  45
  46                 url = 'http://' + location.hostname +
  47                         ( location.port ? ':' + location.port : '' ) + url;
  48
  49                 if( code )
  50                         if( url.substr(url.length-1,1) == '&' )
  51                                 url += code;
  52                         else
  53                                 url += '?' + code;
  54
  55                 xhr.open( 'GET', url, true );
  56
  57                 xhr.onreadystatechange = function()
  58                 {
  59                         if( xhr.readyState == 4 ) {
  60                                 callback( xhr );
  61                         }
  62                 }
  63
  64                 xhr.send( null );
  65         }
  66
  67         this.post = function(url,data,callback)
  68         {
  69                 this.reinit();
  70
  71                 var xhr  = this._xmlHttp;
  72                 var code = this._encode( data );
  73
  74                 xhr.onreadystatechange = function()
  75                 {
  76                         if( xhr.readyState == 4 )
  77                                 callback( xhr );
  78                 }
  79
  80                 xhr.open( 'POST', url, true );
  81                 xhr.setRequestHeader( 'Content-type', 'application/x-www-form-urlencoded' );
  82                 xhr.setRequestHeader( 'Content-length', code.length );
  83                 xhr.setRequestHeader( 'Connection', 'close' );
  84                 xhr.send( code );
  85         }
  86
  87         this.cancel = function()
  88         {
  89                 this._xmlHttp.onreadystatechange = function(){};
  90                 this._xmlHttp.abort();
  91         }
  92
  93         this.send_form = function(form,callback,extra_values)
  94         {
  95                 var code = '';
  96
  97                 for( var i = 0; i < form.elements.length; i++ )
  98                 {
  99                         var e = form.elements[i];
 100
 101                         if( e.options )
 102                         {
 103                                 code += ( code ? '&' : '' ) +
 104                                         form.elements[i].name + '=' + encodeURIComponent(
 105                                                 e.options[e.selectedIndex].value
 106                                         );
 107                         }
 108                         else if( e.length )
 109                         {
 110                                 for( var j = 0; j < e.length; j++ )
 111                                         if( e[j].name ) {
 112                                                 code += ( code ? '&' : '' ) +
 113                                                         e[j].name + '=' + encodeURIComponent( e[j].value );
 114                                         }
 115                         }
 116                         else
 117                         {
 118                                 code += ( code ? '&' : '' ) +
 119                                         e.name + '=' + encodeURIComponent( e.value );
 120                         }
 121                 }
 122
 123                 if( typeof extra_values == 'object' )
 124                         for( var key in extra_values )
 125                                 code += ( code ? '&' : '' ) +
 126                                         key + '=' + encodeURIComponent( extra_values[key] );
 127
 128                 return(
 129                         ( form.method == 'get' )
 130                                 ? this.get( form.getAttribute('action'), code, callback )
 131                                 : this.post( form.getAttribute('action'), code, callback )
 132                 );
 133         }
 134
 135         this._encode = function(obj)
 136         {
 137                 if( typeof obj == 'object' )
 138                 {
 139                         var code = '';
 140                         var self = this;
 141
 142                         for( var k in obj )
 143                                 code += ( code ? '&' : '' ) +
 144                                         k + '=' + encodeURIComponent( obj[k] );
 145                         return code;
 146                 }
 147
 148                 return obj;
 149         }
 150 }