ajax.js

Dateigrösse: 4.78 kb

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