Add js http helper

dashboard/js/http.js

@@ -0,0 +1,43 @@
+try {
+    new ActiveXObject("Msxml2.XMLHTTP");
+    getXHR = function() {
+        return new ActiveXObject("Msxml2.XMLHTTP");
+    }
+} catch (e) {
+    try {
+        new ActiveXObject("Microsoft.XMLHTTP");
+        getXHR = function() {
+            return new ActiveXObject("Microsoft.XMLHTTP");
+        }
+    } catch (e) {
+        if (typeof XMLHttpRequest !== 'undefined') {
+            getXHR = function() {
+                return new XMLHttpRequest();
+            }
+        } else {
+            alert("Something went really wrong!");
+            console.log("XHR is not available");
+        }
+    }
+}
+
+function getURL(url, params, callback) {
+    if (Object.keys(params).length > 0) {
+        var pairs = [];
+        for (key in params) {
+            pairs.push(key +'='+ encodeURIComponent(params[key]))
+        }
+        url += '?'+ pairs.join('&');
+    }
+
+    var xhr = getXHR();
+    xhr.open('GET', url, true);
+    xhr.onreadystatechange = function() {
+        if (xhr.readyState === 4) {
+            if(xhr.status === 200) {
+                callback(JSON.parse(xhr.responseText));
+            }
+        }
+    };
+    xhr.send(null);
+}