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| 1 | +(function( jQuery ) { |
| 2 | + |
| 3 | +var // #5280: Internet Explorer will keep connections alive if we don't abort on unload |
| 4 | + xhrOnUnloadAbort = window.ActiveXObject ? function() { |
| 5 | + // Abort all pending requests |
| 6 | + for ( var key in xhrCallbacks ) { |
| 7 | + xhrCallbacks[ key ]( 0, 1 ); |
| 8 | + } |
| 9 | + } : false, |
| 10 | + xhrId = 0, |
| 11 | + xhrCallbacks; |
| 12 | + |
| 13 | +// Functions to create xhrs |
| 14 | +function createStandardXHR() { |
| 15 | + try { |
| 16 | + return new window.XMLHttpRequest(); |
| 17 | + } catch( e ) {} |
| 18 | +} |
| 19 | + |
| 20 | +function createActiveXHR() { |
| 21 | + try { |
| 22 | + return new window.ActiveXObject( "Microsoft.XMLHTTP" ); |
| 23 | + } catch( e ) {} |
| 24 | +} |
| 25 | + |
| 26 | +// Create the request object |
| 27 | +// (This is still attached to ajaxSettings for backward compatibility) |
| 28 | +jQuery.ajaxSettings.xhr = window.ActiveXObject ? |
| 29 | + /* Microsoft failed to properly |
| 30 | + * implement the XMLHttpRequest in IE7 (can't request local files), |
| 31 | + * so we use the ActiveXObject when it is available |
| 32 | + * Additionally XMLHttpRequest can be disabled in IE7/IE8 so |
| 33 | + * we need a fallback. |
| 34 | + */ |
| 35 | + function() { |
| 36 | + return !this.isLocal && createStandardXHR() || createActiveXHR(); |
| 37 | + } : |
| 38 | + // For all other browsers, use the standard XMLHttpRequest object |
| 39 | + createStandardXHR; |
| 40 | + |
| 41 | +// Determine support properties |
| 42 | +(function( xhr ) { |
| 43 | + jQuery.extend( jQuery.support, { |
| 44 | + ajax: !!xhr, |
| 45 | + cors: !!xhr && ( "withCredentials" in xhr ) |
| 46 | + }); |
| 47 | +})( jQuery.ajaxSettings.xhr() ); |
| 48 | + |
| 49 | +// Create transport if the browser can provide an xhr |
| 50 | +if ( jQuery.support.ajax ) { |
| 51 | + |
| 52 | + jQuery.ajaxTransport(function( s ) { |
| 53 | + // Cross domain only allowed if supported through XMLHttpRequest |
| 54 | + if ( !s.crossDomain || jQuery.support.cors ) { |
| 55 | + |
| 56 | + var callback; |
| 57 | + |
| 58 | + return { |
| 59 | + send: function( headers, complete ) { |
| 60 | + |
| 61 | + // Get a new xhr |
| 62 | + var xhr = s.xhr(), |
| 63 | + handle, |
| 64 | + i; |
| 65 | + |
| 66 | + // Open the socket |
| 67 | + // Passing null username, generates a login popup on Opera (#2865) |
| 68 | + if ( s.username ) { |
| 69 | + xhr.open( s.type, s.url, s.async, s.username, s.password ); |
| 70 | + } else { |
| 71 | + xhr.open( s.type, s.url, s.async ); |
| 72 | + } |
| 73 | + |
| 74 | + // Apply custom fields if provided |
| 75 | + if ( s.xhrFields ) { |
| 76 | + for ( i in s.xhrFields ) { |
| 77 | + xhr[ i ] = s.xhrFields[ i ]; |
| 78 | + } |
| 79 | + } |
| 80 | + |
| 81 | + // Override mime type if needed |
| 82 | + if ( s.mimeType && xhr.overrideMimeType ) { |
| 83 | + xhr.overrideMimeType( s.mimeType ); |
| 84 | + } |
| 85 | + |
| 86 | + // X-Requested-With header |
| 87 | + // For cross-domain requests, seeing as conditions for a preflight are |
| 88 | + // akin to a jigsaw puzzle, we simply never set it to be sure. |
| 89 | + // (it can always be set on a per-request basis or even using ajaxSetup) |
| 90 | + // For same-domain requests, won't change header if already provided. |
| 91 | + if ( !s.crossDomain && !headers["X-Requested-With"] ) { |
| 92 | + headers[ "X-Requested-With" ] = "XMLHttpRequest"; |
| 93 | + } |
| 94 | + |
| 95 | + // Need an extra try/catch for cross domain requests in Firefox 3 |
| 96 | + try { |
| 97 | + for ( i in headers ) { |
| 98 | + xhr.setRequestHeader( i, headers[ i ] ); |
| 99 | + } |
| 100 | + } catch( _ ) {} |
| 101 | + |
| 102 | + // Do send the request |
| 103 | + // This may raise an exception which is actually |
| 104 | + // handled in jQuery.ajax (so no try/catch here) |
| 105 | + xhr.send( ( s.hasContent && s.data ) || null ); |
| 106 | + |
| 107 | + // Listener |
| 108 | + callback = function( _, isAbort ) { |
| 109 | + |
| 110 | + var status, |
| 111 | + statusText, |
| 112 | + responseHeaders, |
| 113 | + responses, |
| 114 | + xml; |
| 115 | + |
| 116 | + // Firefox throws exceptions when accessing properties |
| 117 | + // of an xhr when a network error occured |
| 118 | + // http://helpful.knobs-dials.com/index.php/Component_returned_failure_code:_0x80040111_(NS_ERROR_NOT_AVAILABLE) |
| 119 | + try { |
| 120 | + |
| 121 | + // Was never called and is aborted or complete |
| 122 | + if ( callback && ( isAbort || xhr.readyState === 4 ) ) { |
| 123 | + |
| 124 | + // Only called once |
| 125 | + callback = undefined; |
| 126 | + |
| 127 | + // Do not keep as active anymore |
| 128 | + if ( handle ) { |
| 129 | + xhr.onreadystatechange = jQuery.noop; |
| 130 | + if ( xhrOnUnloadAbort ) { |
| 131 | + delete xhrCallbacks[ handle ]; |
| 132 | + } |
| 133 | + } |
| 134 | + |
| 135 | + // If it's an abort |
| 136 | + if ( isAbort ) { |
| 137 | + // Abort it manually if needed |
| 138 | + if ( xhr.readyState !== 4 ) { |
| 139 | + xhr.abort(); |
| 140 | + } |
| 141 | + } else { |
| 142 | + status = xhr.status; |
| 143 | + responseHeaders = xhr.getAllResponseHeaders(); |
| 144 | + responses = {}; |
| 145 | + xml = xhr.responseXML; |
| 146 | + |
| 147 | + // Construct response list |
| 148 | + if ( xml && xml.documentElement /* #4958 */ ) { |
| 149 | + responses.xml = xml; |
| 150 | + } |
| 151 | + responses.text = xhr.responseText; |
| 152 | + |
| 153 | + // Firefox throws an exception when accessing |
| 154 | + // statusText for faulty cross-domain requests |
| 155 | + try { |
| 156 | + statusText = xhr.statusText; |
| 157 | + } catch( e ) { |
| 158 | + // We normalize with Webkit giving an empty statusText |
| 159 | + statusText = ""; |
| 160 | + } |
| 161 | + |
| 162 | + // Filter status for non standard behaviors |
| 163 | + |
| 164 | + // If the request is local and we have data: assume a success |
| 165 | + // (success with no data won't get notified, that's the best we |
| 166 | + // can do given current implementations) |
| 167 | + if ( !status && s.isLocal && !s.crossDomain ) { |
| 168 | + status = responses.text ? 200 : 404; |
| 169 | + // IE - #1450: sometimes returns 1223 when it should be 204 |
| 170 | + } else if ( status === 1223 ) { |
| 171 | + status = 204; |
| 172 | + } |
| 173 | + } |
| 174 | + } |
| 175 | + } catch( firefoxAccessException ) { |
| 176 | + if ( !isAbort ) { |
| 177 | + complete( -1, firefoxAccessException ); |
| 178 | + } |
| 179 | + } |
| 180 | + |
| 181 | + // Call complete if needed |
| 182 | + if ( responses ) { |
| 183 | + complete( status, statusText, responses, responseHeaders ); |
| 184 | + } |
| 185 | + }; |
| 186 | + |
| 187 | + // if we're in sync mode or it's in cache |
| 188 | + // and has been retrieved directly (IE6 & IE7) |
| 189 | + // we need to manually fire the callback |
| 190 | + if ( !s.async || xhr.readyState === 4 ) { |
| 191 | + callback(); |
| 192 | + } else { |
| 193 | + handle = ++xhrId; |
| 194 | + if ( xhrOnUnloadAbort ) { |
| 195 | + // Create the active xhrs callbacks list if needed |
| 196 | + // and attach the unload handler |
| 197 | + if ( !xhrCallbacks ) { |
| 198 | + xhrCallbacks = {}; |
| 199 | + jQuery( window ).unload( xhrOnUnloadAbort ); |
| 200 | + } |
| 201 | + // Add to list of active xhrs callbacks |
| 202 | + xhrCallbacks[ handle ] = callback; |
| 203 | + } |
| 204 | + xhr.onreadystatechange = callback; |
| 205 | + } |
| 206 | + }, |
| 207 | + |
| 208 | + abort: function() { |
| 209 | + if ( callback ) { |
| 210 | + callback(0,1); |
| 211 | + } |
| 212 | + } |
| 213 | + }; |
| 214 | + } |
| 215 | + }); |
| 216 | +} |
| 217 | + |
| 218 | +})( jQuery ); |
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