Support IE11

Previously `let of` loop was used, which isn't supported in IE11.

It seems it just fails when there is some JS syntax error
(doesn't matter where exactly) and dataType: 'json' has no effect.

Closes #982

app/assets/javascripts/admin-manifest.coffee

@@ -8,6 +8,10 @@
 #= require jquery-ui/datepicker
 #= require select2
 #= require jquery.doubleScroll
+
+# Load order does matter
+#= require polyfills/node_list_for_each
+
 #= require datepicker
 #= require spell_check
 #= require admin/application

app/assets/javascripts/polyfills/node_list_for_each.js

@@ -0,0 +1,11 @@
+// Needed mainly for IE11
+// https://developer.mozilla.org/en-US/docs/Web/API/NodeList/forEach
+
+if (window.NodeList && !NodeList.prototype.forEach) {
+    NodeList.prototype.forEach = function (callback, thisArg) {
+        thisArg = thisArg || window;
+        for (var i = 0; i < this.length; i++) {
+            callback.call(thisArg, this[i], i, this);
+        }
+    };
+}

app/assets/javascripts/registrant-manifest.coffee

@@ -4,5 +4,9 @@
 #= require jquery-ui/datepicker
 #= require select2
 #= require datepicker
+
+# Load order does matter
+#= require polyfills/node_list_for_each
+
 #= require spell_check
 #= require shared/general

app/assets/javascripts/registrar-manifest.coffee

@@ -6,6 +6,10 @@
 #= require jquery-ui/datepicker
 #= require select2
 #= require datepicker
+
+# Load order does matter
+#= require polyfills/node_list_for_each
+
 #= require spell_check
 #= require popover
 #= require text_field_trimmer

app/assets/javascripts/spell_check.js

@@ -3,9 +3,11 @@
         let selector = 'input[type=text], textarea';
         let textFields = document.querySelectorAll(selector);
 
-        for (let field of textFields) {
+        textFields.forEach(
+            function (field, _currentIndex, _listObj) {
                 field.spellcheck = false;
             }
+        );
     }
 
     disableSpellCheck();

app/assets/javascripts/text_field_trimmer.js

@@ -2,13 +2,15 @@
     function trimTextFields() {
         let selector = 'input[type=text], input[type=search], input[type=email], textarea';
         let textFields = document.querySelectorAll(selector);
-        let listener = function () {
+        let changeListener = function () {
             this.value = this.value.trim();
         };
 
-        for (let field of textFields) {
+        textFields.forEach(
-            field.addEventListener('change', listener);
+            function (field, currentIndex, listObj) {
+                field.addEventListener('change', changeListener);
             }
+        );
     }
 
     trimTextFields();