#2417 Possibility to specify dataType for $.ajax call in yii.activeForm.js

framework/assets/yii.activeForm.js

@@ -45,7 +45,9 @@
 		// function ($form, attribute, messages)
 		afterValidate: undefined,
 		// the GET parameter name indicating an AJAX-based validation
-		ajaxVar: 'ajax'
+		ajaxVar: 'ajax',
+		// the type of data that you're expecting back from the server
+		ajaxDataType: 'json'
 	};
 
 	var attributeDefaults = {
@@ -301,7 +303,7 @@
 				url: data.settings.validationUrl,
 				type: $form.prop('method'),
 				data: $form.serialize() + extData,
-				dataType: 'json',
+				dataType: data.settings.ajaxDataType,
 				success: function (msgs) {
 					if (msgs !== null && typeof msgs === 'object') {
 						$.each(data.attributes, function () {

framework/widgets/ActiveForm.php

@@ -103,6 +103,10 @@ class ActiveForm extends Widget
 	 * @var string the name of the GET parameter indicating the validation request is an AJAX request.
 	 */
 	public $ajaxVar = 'ajax';
+	/**
+	 * @var string the type of data that you're expecting back from the server.
+	 */
+	public $ajaxDataType = 'json';
 	/**
 	 * @var string|JsExpression a JS callback that will be called when the form is being submitted.
 	 * The signature of the callback should be:
@@ -187,6 +191,7 @@ class ActiveForm extends Widget
 			'successCssClass' => $this->successCssClass,
 			'validatingCssClass' => $this->validatingCssClass,
 			'ajaxVar' => $this->ajaxVar,
+			'ajaxDataType' => $this->ajaxDataType,
 		];
 		if ($this->validationUrl !== null) {
 			$options['validationUrl'] = Html::url($this->validationUrl);