Rewrite accordion widget in vanilla Javascript

assets/js/core/kb.js

@@ -0,0 +1,60 @@
+'use strict';
+
+var KB = {
+    components: {},
+    utils: {},
+    clickEvents: {}
+};
+
+KB.onClick = function (selector, callback) {
+    this.clickEvents[selector] = callback;
+};
+
+KB.listen = function () {
+    var self = this;
+
+    function onClick(e) {
+        for (var selector in self.clickEvents) {
+            if (self.clickEvents.hasOwnProperty(selector) && e.target.matches(selector)) {
+                e.preventDefault();
+                self.clickEvents[selector](e);
+            }
+        }
+    }
+
+    document.addEventListener('click', onClick, false);
+};
+
+KB.component = function (name, object) {
+    this.components[name] = object;
+};
+
+KB.render = function () {
+    for (var name in this.components) {
+        var elementList = document.querySelectorAll('.js-' + name);
+
+        for (var i = 0; i < elementList.length; i++) {
+            if (this.components.hasOwnProperty(name)) {
+                var object = this.components[name];
+                var component = new object(elementList[i], JSON.parse(elementList[i].dataset.params));
+
+                component.render();
+                elementList[i].className = elementList[i].className + '-rendered';
+            }
+        }
+    }
+};
+
+KB.utils.formatDuration = function (d) {
+    if (d >= 86400) {
+        return Math.round(d/86400) + "d";
+    }
+    else if (d >= 3600) {
+        return Math.round(d/3600) + "h";
+    }
+    else if (d >= 60) {
+        return Math.round(d/60) + "m";
+    }
+
+    return d + "s";
+};