Refactor assets bundler and split Javascript files

ui/static/js/dom_helper.js

@@ -0,0 +1,46 @@
+class DomHelper {
+    static isVisible(element) {
+        return element.offsetParent !== null;
+    }
+
+    static openNewTab(url) {
+        let win = window.open("");
+        win.opener = null;
+        win.location = url;
+        win.focus();
+    }
+
+    static scrollPageTo(element) {
+        let windowScrollPosition = window.pageYOffset;
+        let windowHeight = document.documentElement.clientHeight;
+        let viewportPosition = windowScrollPosition + windowHeight;
+        let itemBottomPosition = element.offsetTop + element.offsetHeight;
+
+        if (viewportPosition - itemBottomPosition < 0 || viewportPosition - element.offsetTop > windowHeight) {
+            window.scrollTo(0, element.offsetTop - 10);
+        }
+    }
+
+    static getVisibleElements(selector) {
+        let elements = document.querySelectorAll(selector);
+        let result = [];
+
+        for (let i = 0; i < elements.length; i++) {
+            if (this.isVisible(elements[i])) {
+                result.push(elements[i]);
+            }
+        }
+
+        return result;
+    }
+
+    static findParent(element, selector) {
+        for (; element && element !== document; element = element.parentNode) {
+            if (element.classList.contains(selector)) {
+                return element;
+            }
+        }
+
+        return null;
+    }
+}