construct header file in utils

js/utils/head_setter.js

@@ -0,0 +1,43 @@
+/**
+ * Created by cevo on 06.10.15.
+ */
+'use strict';
+
+// faviconType: string, is the type of the favicon, such as link, meta, etc.
+//faviconId id of the favicon
+// faviconDict: hash table containing the attributes of the relevant favicon
+
+let constructHeadElement = function(elementType, elementId, elementAttributes) {
+    console.log('setfavicon invoked');
+    var head = (document.head || document.getElementsByTagName('head')[0]);
+    var element = document.createElement(elementType);
+    var oldElement = document.getElementById(elementId);
+    try {
+        for (let k in elementAttributes){
+            console.log('Setting ', k, elementAttributes[k]);
+            element.setAttribute(k, elementAttributes[k]);
+        }
+    }
+    catch(e){
+        console.log(e.message());
+    }
+    if (oldElement) {
+        head.removeChild(oldElement);
+    }
+    head.appendChild(element);
+    return this;
+};
+
+// Accepts a dictionary of dictionaries which comprises a part or all of html head part
+// {link : {id1: {rel: ... }}}
+// traverses a tree of depth 3 (no backtracking)
+export function constructHead(headObject){
+    console.log('Going to set all favicons');
+    console.log(headObject);
+    for (let k in headObject){
+        let favicons = headObject[k];
+        for (let f in favicons){
+            constructHeadElement(k, f, favicons[f]);
+        }
+    }
+}