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 = location.protocol + '//' + location.host + url;
  47
  48                 if( code )
  49                         if( url.substr(url.length-1,1) == '&' )
  50                                 url += code;
  51                         else
  52                                 url += '?' + code;
  53
  54                 xhr.open( 'GET', url, true );
  55
  56                 xhr.onreadystatechange = function()
  57                 {
  58                         if( xhr.readyState == 4 ) {
  59                                 var json = null;
  60                                 if( xhr.getResponseHeader("Content-Type") == "application/json" ) {
  61                                         try {
  62                                                 json = eval('(' + xhr.responseText + ')');
  63                                         }
  64                                         catch(e) {
  65                                                 json = null;
  66                                         }
  67                                 }
  68
  69                                 callback( xhr, json );
  70                         }
  71                 }
  72
  73                 xhr.send( null );
  74         }
  75
  76         this.post = function(url,data,callback)
  77         {
  78                 this.reinit();
  79
  80                 var xhr  = this._xmlHttp;
  81                 var code = this._encode( data );
  82
  83                 xhr.onreadystatechange = function()
  84                 {
  85                         if( xhr.readyState == 4 )
  86                                 callback( xhr );
  87                 }
  88
  89                 xhr.open( 'POST', url, true );
  90                 xhr.setRequestHeader( 'Content-type', 'application/x-www-form-urlencoded' );
  91                 xhr.setRequestHeader( 'Content-length', code.length );
  92                 xhr.setRequestHeader( 'Connection', 'close' );
  93                 xhr.send( code );
  94         }
  95
  96         this.cancel = function()
  97         {
  98                 this._xmlHttp.onreadystatechange = function(){};
  99                 this._xmlHttp.abort();
 100         }
 101
 102         this.send_form = function(form,callback,extra_values)
 103         {
 104                 var code = '';
 105
 106                 for( var i = 0; i < form.elements.length; i++ )
 107                 {
 108                         var e = form.elements[i];
 109
 110                         if( e.options )
 111                         {
 112                                 code += ( code ? '&' : '' ) +
 113                                         form.elements[i].name + '=' + encodeURIComponent(
 114                                                 e.options[e.selectedIndex].value
 115                                         );
 116                         }
 117                         else if( e.length )
 118                         {
 119                                 for( var j = 0; j < e.length; j++ )
 120                                         if( e[j].name ) {
 121                                                 code += ( code ? '&' : '' ) +
 122                                                         e[j].name + '=' + encodeURIComponent( e[j].value );
 123                                         }
 124                         }
 125                         else
 126                         {
 127                                 code += ( code ? '&' : '' ) +
 128                                         e.name + '=' + encodeURIComponent( e.value );
 129                         }
 130                 }
 131
 132                 if( typeof extra_values == 'object' )
 133                         for( var key in extra_values )
 134                                 code += ( code ? '&' : '' ) +
 135                                         key + '=' + encodeURIComponent( extra_values[key] );
 136
 137                 return(
 138                         ( form.method == 'get' )
 139                                 ? this.get( form.getAttribute('action'), code, callback )
 140                                 : this.post( form.getAttribute('action'), code, callback )
 141                 );
 142         }
 143
 144         this._encode = function(obj)
 145         {
 146                 obj = obj ? obj : { };
 147                 obj['_'] = Math.random();
 148
 149                 if( typeof obj == 'object' )
 150                 {
 151                         var code = '';
 152                         var self = this;
 153
 154                         for( var k in obj )
 155                                 code += ( code ? '&' : '' ) +
 156                                         k + '=' + encodeURIComponent( obj[k] );
 157
 158                         return code;
 159                 }
 160
 161                 return obj;
 162         }
 163 }