Changeset 27322 for main/trunk

Timestamp:

2013-05-09T18:19:57+12:00 (11 years ago)

Author:

ak19

Message:

Added Ajax PostAsync method urlPostAsync and tested it works.

File:

• main/trunk/greenstone2/web/script/gsajaxapi.js (modified) (2 diffs)

main/trunk/greenstone2/web/script/gsajaxapi.js

@@ -188 +188 @@
     xmlHttp.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded');
     
-    // If asynchronous:
-//    xmlHttp.onreadystatechange = function() {
-//        if (xmlHttp.readyState == 4) {
-//            updatepage(xmlHttp.responseText);
-//        }
-//    }
-    
     if(un_ != null) {
     params += "&un=" + un_;
@@ -208 +201 @@
     return xmlHttp.responseText;
 }
+
+    // New, an Ajax Asynchronous Post method.
+    // For helpful links, see the urlPostSync() method above
+    this.urlPostAsync = function(scriptURL, params, callback) {
+    var xmlHttp=false;
+       try {
+         // Firefox, Opera 8.0+, Safari
+         xmlHttp=new XMLHttpRequest();
+       }
+       catch (e) {
+         // Internet Explorer
+         try {
+           xmlHttp=new ActiveXObject("Msxml2.XMLHTTP");
+         }
+         catch (e) {
+           try {
+             xmlHttp=new ActiveXObject("Microsoft.XMLHTTP");
+           }
+           catch (e) {
+             alert("Your browser does not support AJAX!");
+             return false;
+           }
+         }
+       }
+
+
+
+    // e.g. scriptURL: /greenstone/cgi-bin/metadata-server.pl
+    xmlHttp.open('POST', scriptURL, true); // true means asynchronous
+    xmlHttp.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded');
+
+
+    // If asynchronous:
+    // If the callback param is a function, we will set it up to get called when 
+    // the async post has finished (is ready)
+    // if the callback parameter isn't a function, the param represents a field 
+    // that we want to dynamically update when the async post process has finished
+
+    var typeof_callback = typeof(callback);
+    if ((typeof_callback == "string") || (typeof_callback == "number") || (typeof_callback == "boolean")) {
+        var locid = callback;
+
+        xmlHttp.onreadystatechange=function() {
+        if(xmlHttp.readyState==4) {
+            if (locelem != null) {
+            var locelem = document.getElementById(locid);
+            
+            locelem.innerHTML = xmlHttp.responseText;
+            }
+        }
+        }
+    }
+    else if (typeof_callback == "function") {
+        xmlHttp.onreadystatechange=function() {
+        if(xmlHttp.readyState==4) {
+            callback(xmlHttp); // e.g. this might do: updatepage(xmlHttp.responseText);
+        }
+        }
+    }
+    else {
+        alert("Unrecognized type of callback value: " + typeof_callback);
+    }
+    
+    if(un_ != null) {
+    params += "&un=" + un_;
+    }
+    if(ky_ != null) {
+    params += "&ky=" + ky_;
+    }
+    //alert("Posting Async: " + scriptURL + "?" + params);
+
+    xmlHttp.send(params); // needs to be escaped/encoded
+    // if synchronous, would process xmlHttp AFTER send() call, such as by
+    // accessing xmlHttp.responseText to return that to the caller at this point.
+}
+
 
     this.setLiveMetadata = function(id,metaname,metavalue)