resources/src/mediawiki.legacy/ajax.js

   1 /**
   2  * Remote Scripting Library
   3  * Copyright 2005 modernmethod, inc
   4  * Under the open source BSD license
   5  * http://www.modernmethod.com/sajax/
   6  */
   7
   8 /*jscs:disable requireCamelCaseOrUpperCaseIdentifiers */
   9 /*global alert */
  10 ( function ( mw ) {
  11
  12 /**
  13  * if sajax_debug_mode is true, this function outputs given the message into
  14  * the element with id = sajax_debug; if no such element exists in the document,
  15  * it is injected.
  16  */
  17 function debug( text ) {
  18         if ( !window.sajax_debug_mode ) {
  19                 return false;
  20         }
  21
  22         var b, m,
  23                 e = document.getElementById( 'sajax_debug' );
  24
  25         if ( !e ) {
  26                 e = document.createElement( 'p' );
  27                 e.className = 'sajax_debug';
  28                 e.id = 'sajax_debug';
  29
  30                 b = document.getElementsByTagName( 'body' )[0];
  31
  32                 if ( b.firstChild ) {
  33                         b.insertBefore( e, b.firstChild );
  34                 } else {
  35                         b.appendChild( e );
  36                 }
  37         }
  38
  39         m = document.createElement( 'div' );
  40         m.appendChild( document.createTextNode( text ) );
  41
  42         e.appendChild( m );
  43
  44         return true;
  45 }
  46
  47 /**
  48  * Compatibility wrapper for creating a new XMLHttpRequest object.
  49  */
  50 function createXhr() {
  51         debug( 'sajax_init_object() called..' );
  52         var a;
  53         try {
  54                 // Try the new style before ActiveX so we don't
  55                 // unnecessarily trigger warnings in IE 7 when
  56                 // set to prompt about ActiveX usage
  57                 a = new XMLHttpRequest();
  58         } catch ( xhrE ) {
  59                 try {
  60                         a = new window.ActiveXObject( 'Msxml2.XMLHTTP' );
  61                 } catch ( msXmlE ) {
  62                         try {
  63                                 a = new window.ActiveXObject( 'Microsoft.XMLHTTP' );
  64                         } catch ( msXhrE ) {
  65                                 a = null;
  66                         }
  67                 }
  68         }
  69         if ( !a ) {
  70                 debug( 'Could not create connection object.' );
  71         }
  72
  73         return a;
  74 }
  75
  76 /**
  77  * Perform an AJAX call to MediaWiki. Calls are handled by AjaxDispatcher.php
  78  *   func_name - the name of the function to call. Must be registered in $wgAjaxExportList
  79  *   args - an array of arguments to that function
  80  *   target - the target that will handle the result of the call. If this is a function,
  81  *            if will be called with the XMLHttpRequest as a parameter; if it's an input
  82  *            element, its value will be set to the resultText; if it's another type of
  83  *            element, its innerHTML will be set to the resultText.
  84  *
  85  * Example:
  86  *    sajax_do_call( 'doFoo', [1, 2, 3], document.getElementById( 'showFoo' ) );
  87  *
  88  * This will call the doFoo function via MediaWiki's AjaxDispatcher, with
  89  * (1, 2, 3) as the parameter list, and will show the result in the element
  90  * with id = showFoo
  91  */
  92 function doAjaxRequest( func_name, args, target ) {
  93         var i, x, uri, post_data;
  94         uri = mw.util.wikiScript() + '?action=ajax';
  95         if ( window.sajax_request_type === 'GET' ) {
  96                 if ( uri.indexOf( '?' ) === -1 ) {
  97                         uri = uri + '?rs=' + encodeURIComponent( func_name );
  98                 } else {
  99                         uri = uri + '&rs=' + encodeURIComponent( func_name );
 100                 }
 101                 for ( i = 0; i < args.length; i++ ) {
 102                         uri = uri + '&rsargs[]=' + encodeURIComponent( args[i] );
 103                 }
 104                 //uri = uri + '&rsrnd=' + new Date().getTime();
 105                 post_data = null;
 106         } else {
 107                 post_data = 'rs=' + encodeURIComponent( func_name );
 108                 for ( i = 0; i < args.length; i++ ) {
 109                         post_data = post_data + '&rsargs[]=' + encodeURIComponent( args[i] );
 110                 }
 111         }
 112         x = createXhr();
 113         if ( !x ) {
 114                 alert( 'AJAX not supported' );
 115                 return false;
 116         }
 117
 118         try {
 119                 x.open( window.sajax_request_type, uri, true );
 120         } catch ( e ) {
 121                 if ( location.hostname === 'localhost' ) {
 122                         alert( 'Your browser blocks XMLHttpRequest to "localhost", try using a real hostname for development/testing.' );
 123                 }
 124                 throw e;
 125         }
 126         if ( window.sajax_request_type === 'POST' ) {
 127                 x.setRequestHeader( 'Method', 'POST ' + uri + ' HTTP/1.1' );
 128                 x.setRequestHeader( 'Content-Type', 'application/x-www-form-urlencoded' );
 129         }
 130         x.setRequestHeader( 'Pragma', 'cache=yes' );
 131         x.setRequestHeader( 'Cache-Control', 'no-transform' );
 132         x.onreadystatechange = function () {
 133                 if ( x.readyState !== 4 ) {
 134                         return;
 135                 }
 136
 137                 debug( 'received (' + x.status + ' ' + x.statusText + ') ' + x.responseText );
 138
 139                 //if ( x.status != 200 )
 140                 //      alert( 'Error: ' + x.status + ' ' + x.statusText + ': ' + x.responseText );
 141                 //else
 142
 143                 if ( typeof target === 'function' ) {
 144                         target( x );
 145                 } else if ( typeof target === 'object' ) {
 146                         if ( target.tagName === 'INPUT' ) {
 147                                 if ( x.status === 200 ) {
 148                                         target.value = x.responseText;
 149                                 }
 150                                 //else alert( 'Error: ' + x.status + ' ' + x.statusText + ' (' + x.responseText + ')' );
 151                         } else {
 152                                 if ( x.status === 200 ) {
 153                                         target.innerHTML = x.responseText;
 154                                 } else {
 155                                         target.innerHTML = '<div class="error">Error: ' + x.status +
 156                                                 ' ' + x.statusText + ' (' + x.responseText + ')</div>';
 157                                 }
 158                         }
 159                 } else {
 160                         alert( 'Bad target for sajax_do_call: not a function or object: ' + target );
 161                 }
 162         };
 163
 164         debug( func_name + ' uri = ' + uri + ' / post = ' + post_data );
 165         x.send( post_data );
 166         debug( func_name + ' waiting..' );
 167
 168         return true;
 169 }
 170
 171 /**
 172  * @return {boolean} Whether the browser supports AJAX
 173  */
 174 function wfSupportsAjax() {
 175         var request = createXhr(),
 176                 supportsAjax = request ? true : false;
 177
 178         request = undefined;
 179         return supportsAjax;
 180 }
 181
 182 // Expose + Mark as deprecated
 183 var deprecationNotice = 'Sajax is deprecated, use jQuery.ajax or mediawiki.api instead.';
 184
 185 // Variables
 186 mw.log.deprecate( window, 'sajax_debug_mode', false, deprecationNotice );
 187 mw.log.deprecate( window, 'sajax_request_type', 'GET', deprecationNotice );
 188 // Methods
 189 mw.log.deprecate( window, 'sajax_debug', debug, deprecationNotice );
 190 mw.log.deprecate( window, 'sajax_init_object', createXhr, deprecationNotice );
 191 mw.log.deprecate( window, 'sajax_do_call', doAjaxRequest, deprecationNotice );
 192 mw.log.deprecate( window, 'wfSupportsAjax', wfSupportsAjax, deprecationNotice );
 193
 194 }( mediaWiki ) );