netteForms: modernized code

src/assets/netteForms.js

@@ -328,9 +328,8 @@
 
 		dialog.setAttribute('class', 'netteFormsModal');
 		dialog.innerText = message + '\n\n';
-		dialog.appendChild(style);
-		dialog.appendChild(button);
-		document.body.appendChild(dialog);
+		dialog.append(style, button);
+		document.body.append(dialog);
 		dialog.showModal();
 	};
 
@@ -369,7 +368,7 @@
 		filled: function(elem, arg, val) {
 			return val !== '' && val !== false && val !== null
 				&& (!Array.isArray(val) || !!val.length)
-				&& (!window.FileList || !(val instanceof window.FileList) || val.length);
+				&& (!(val instanceof FileList) || val.length);
 		},
 
 		blank: function(elem, arg, val) {
@@ -458,7 +457,7 @@
 					regExp = new RegExp('^(?:' + arg + ')$', caseInsensitive ? 'i' : '');
 				}
 
-				if (window.FileList && val instanceof FileList) {
+				if (val instanceof FileList) {
 					for (var i = 0; i < val.length; i++) {
 						if (!regExp.test(val[i].name)) {
 							return false;
@@ -511,11 +510,9 @@
 		},
 
 		fileSize: function(elem, arg, val) {
-			if (window.FileList) {
-				for (var i = 0; i < val.length; i++) {
-					if (val[i].size > arg) {
-						return false;
-					}
+			for (var i = 0; i < val.length; i++) {
+				if (val[i].size > arg) {
+					return false;
 				}
 			}
 			return true;
@@ -528,7 +525,7 @@
 			}
 			re = new RegExp(re.join('|'));
 
-			if (window.FileList && val instanceof FileList) {
+			if (val instanceof FileList) {
 				for (i = 0; i < val.length; i++) {
 					if (val[i].type && !re.test(val[i].type)) {
 						return false;
@@ -682,7 +679,7 @@
 				elem = document.createElement('input');
 				elem.setAttribute('name', name);
 				elem.setAttribute('type', 'hidden');
-				form.appendChild(elem);
+				form.append(elem);
 			}
 			form.elements[name].value = values[name].join(',');
 			form.elements[name].disabled = values[name].length === 0;