Form Reset: Add form reset mixin

Fixes #12638
Closes gh-1555

1 files changed, 62 insertions, 0 deletions

diff --git a/ui/form-reset-mixin.js b/ui/form-reset-mixin.js
new file mode 100644
index 000000000..a751f7f2a
--- /dev/null
+++ b/ui/form-reset-mixin.js
@@ -0,0 +1,62 @@
+( function( factory ) {
+	if ( typeof define === "function" && define.amd ) {
+
+		// AMD. Register as an anonymous module.
+		define( [
+			"jquery",
+			"ui/core"
+		], factory );
+	} else {
+
+		// Browser globals
+		factory( jQuery );
+	}
+}( function( $ ) {
+
+return $.ui.formResetMixin = {
+	_formResetHandler: function() {
+		var form = $( this );
+
+		// Wait for the form reset to actually happen before refreshing
+		setTimeout( function() {
+			var instances = form.data( "ui-form-reset-instances" );
+			$.each( instances, function() {
+				this.refresh();
+			} );
+		} );
+	},
+
+	_bindFormResetHandler: function() {
+		this.form = this.element.form();
+		if ( !this.form.length ) {
+			return;
+		}
+
+		var instances = this.form.data( "ui-form-reset-instances" ) || [];
+		if ( !instances.length ) {
+
+			// We don't use _on() here because we use a single event handler per form
+			this.form.on( "reset.ui-form-reset", this._formResetHandler );
+		}
+		instances.push( this );
+		this.form.data( "ui-form-reset-instances", instances );
+	},
+
+	_unbindFormResetHandler: function() {
+		if ( !this.form.length ) {
+			return;
+		}
+
+		var instances = this.form.data( "ui-form-reset-instances" );
+		instances.splice( $.inArray( this, instances ), 1 );
+		if ( instances.length ) {
+			this.form.data( "ui-form-reset-instances", instances );
+		} else {
+			this.form
+				.removeData( "ui-form-reset-instances" )
+				.off( "reset.ui-form-reset" );
+		}
+	}
+};
+
+} ) );