diff --git a/framework/widgets/Pjax.php b/framework/widgets/Pjax.php
index d84bdf1154..95099659d5 100644
--- a/framework/widgets/Pjax.php
+++ b/framework/widgets/Pjax.php
@@ -50,9 +50,15 @@ class Pjax extends Widget
 	/**
 	 * @var string the jQuery selector of the links that should trigger pjax requests.
 	 * If not set, all links within the enclosed content of Pjax will trigger pjax requests.
-	 * Note that the pjax response to a link is a full page, a normal request will be sent again.
+	 * Note that if the response to the pjax request is a full page, a normal request will be sent again.
 	 */
 	public $linkSelector;
+	/**
+	 * @var string the jQuery selector of the forms whose submissions should trigger pjax requests.
+	 * If not set, all forms with `data-pjax` attribute within the enclosed content of Pjax will trigger pjax requests.
+	 * Note that if the response to the pjax request is a full page, a normal request will be sent again.
+	 */
+	public $formSelector;
 	/**
 	 * @var boolean whether to enable push state.
 	 */
@@ -148,9 +154,11 @@ class Pjax extends Widget
 		$this->clientOptions['timeout'] = $this->timeout;
 		$options = Json::encode($this->clientOptions);
 		$linkSelector = Json::encode($this->linkSelector !== null ? $this->linkSelector : '#' . $id . ' a');
+		$formSelector = Json::encode($this->formSelector !== null ? $this->formSelector : '#' . $id . ' form[data-pjax]');
 		$view = $this->getView();
 		PjaxAsset::register($view);
 		$js = "jQuery(document).pjax($linkSelector, \"#$id\", $options);";
+		$js .= "jQuery(document).on('submit', $formSelector, function (event) {jQuery.pjax.submit(event, '#$id');});";
 		$view->registerJs($js);
 	}
 }