Actualización

app/Resources/public/assets/jquery-ui/ui/form.js

@@ -0,0 +1,20 @@
+( function( factory ) {
+	if ( typeof define === "function" && define.amd ) {
+
+		// AMD. Register as an anonymous module.
+		define( [ "jquery", "./version" ], factory );
+	} else {
+
+		// Browser globals
+		factory( jQuery );
+	}
+} ( function( $ ) {
+
+// Support: IE8 Only
+// IE8 does not support the form attribute and when it is supplied. It overwrites the form prop
+// with a string, so we need to find the proper form.
+return $.fn.form = function() {
+	return typeof this[ 0 ].form === "string" ? this.closest( "form" ) : $( this[ 0 ].form );
+};
+
+} ) );