Util changes

js/Util.js

@@ -0,0 +1,35 @@
+// Acts as a public static class
+class Util {
+    static getElement(elementOrElementId) {
+        return typeof elementOrElementId
+            ? document.getElementById(elementOrElementId)
+            : elementOrElementId;
+    }
+    static getText(elementId) {
+        return this.getElement(elementId).textContent;
+    }
+
+    static setText(elementId, text) {
+        this.getElement(elementId).textContent = text;
+    }
+    static getValue(elementId) {
+        return this.getElement(elementId).value;
+    }
+    
+    static setValue(elementId, value) {
+        this.getElement(elementId).value = value;
+    }
+    //add class .selected to specified element
+    static select(elementId) {
+        this.getElement(elementId).classList.add('selected');
+    }
+    
+    //remove .selected class from specified element
+    static deselect(elementId) {
+        this.getElement(elementId).classList.remove('selected');
+    }
+    //toggle the status of the .selected class on the specified element
+    static toggle(elementId) {
+        this.getElement(elementId).classList.toggle('selected');
+    }
+}