Fix #8335: Avoid memory leak by never setting data on non-element non…

…-document nodes. Close gh-1127.

src/data.js

@@ -223,6 +223,11 @@ jQuery.extend({

	// A method for determining if a DOM node can handle the data expando
	acceptData: function( elem ) {
		// Do not set data on non-element because it will not be cleared (#8335).
		if ( elem.nodeType && elem.nodeType !== 1 && elem.nodeType !== 9 ) {
			return false;
		}

		var noData = elem.nodeName && jQuery.noData[ elem.nodeName.toLowerCase() ];

		// nodes accept data unless otherwise specified; rejection can be conditional

test/unit/data.js

@@ -99,8 +99,16 @@ test("jQuery.data(document)", 25, function() {
	QUnit.expectJqData(document, "foo");
});

test("Data is not being set on comment and text nodes", function() {
	expect(2);

	ok( !jQuery.hasData( jQuery("<!-- comment -->").data("foo", 0) ) );
	ok( !jQuery.hasData( jQuery("<span>text</span>").contents().data("foo", 0) ) );

});

test("jQuery.acceptData", function() {
	expect(7);
	expect(9);

	ok( jQuery.acceptData( document ), "document" );
	ok( jQuery.acceptData( document.documentElement ), "documentElement" );
@@ -115,6 +123,9 @@ test("jQuery.acceptData", function() {
	var applet = document.createElement("object");
	applet.setAttribute("classid", "clsid:8AD9C840-044E-11D1-B3E9-00805F499D93");
	ok( !jQuery.acceptData( applet ), "applet" );

	ok( !jQuery.acceptData( document.createComment("") ), "comment" );
	ok( !jQuery.acceptData( document.createTextNode("") ), "text" );
});

test(".data()", function() {