add custom DynamicArrayField to better handle arrays

passbook/core/static/js/passbook.js

@@ -16,3 +16,33 @@ const typeHandler = function (e) {
 
 $source.on('input', typeHandler) // register for oninput
 $source.on('propertychange', typeHandler) // for IE8
+
+window.addEventListener('load', function () {
+
+    function addRemoveEventListener(widgetElement) {
+        widgetElement.querySelectorAll('.array-remove').forEach(function (element) {
+            element.addEventListener('click', function () {
+                this.parentNode.parentNode.remove();
+            });
+        });
+    }
+
+    document.querySelectorAll('.dynamic-array-widget').forEach(function (widgetElement) {
+
+        addRemoveEventListener(widgetElement);
+
+        widgetElement.querySelector('.add-array-item').addEventListener('click', function () {
+            var first = widgetElement.querySelector('.array-item');
+            var newElement = first.cloneNode(true);
+            var id_parts = newElement.querySelector('input').getAttribute('id').split('_');
+            var id = id_parts.slice(0, -1).join('_') + '_' + String(parseInt(id_parts.slice(-1)[0]) + 1);
+            newElement.querySelector('input').setAttribute('id', id);
+            newElement.querySelector('input').value = '';
+
+            addRemoveEventListener(newElement);
+            first.parentElement.insertBefore(newElement, first.parentNode.lastChild);
+        });
+
+    });
+
+});