Create some js file

Author: kr-viku

module5-solution/js/ajax-utils.js

@@ -0,0 +1,67 @@
+(function (global) {
+
+// Set up a namespace for our utility
+var ajaxUtils = {};
+
+
+// Returns an HTTP request object
+function getRequestObject() {
+  if (window.XMLHttpRequest) {
+    return (new XMLHttpRequest());
+  } 
+  else if (window.ActiveXObject) {
+    // For very old IE browsers (optional)
+    return (new ActiveXObject("Microsoft.XMLHTTP"));
+  } 
+  else {
+    global.alert("Ajax is not supported!");
+    return(null); 
+  }
+}
+
+
+// Makes an Ajax GET request to 'requestUrl'
+ajaxUtils.sendGetRequest = 
+  function(requestUrl, responseHandler, isJsonResponse) {
+    var request = getRequestObject();
+    request.onreadystatechange = 
+      function() { 
+        handleResponse(request, 
+                       responseHandler,
+                       isJsonResponse); 
+      };
+    request.open("GET", requestUrl, true);
+    request.send(null); // for POST only
+  };
+
+
+// Only calls user provided 'responseHandler'
+// function if response is ready
+// and not an error
+function handleResponse(request,
+                        responseHandler,
+                        isJsonResponse) {
+  if ((request.readyState == 4) &&
+     (request.status == 200)) {
+
+    // Default to isJsonResponse = true
+    if (isJsonResponse == undefined) {
+      isJsonResponse = true;
+    }
+
+    if (isJsonResponse) {
+      responseHandler(JSON.parse(request.responseText));
+    }
+    else {
+      responseHandler(request.responseText);
+    }
+  }
+}
+
+
+// Expose utility to the global object
+global.$ajaxUtils = ajaxUtils;
+
+
+})(window);
+