Update jQuery.hasData to always return a boolean, with unit tests.

diff --git a/src/data.js b/src/data.js
index 120fe718dc5aa7a9d371386cac1e28ffe9e1423b..c3530c835f731a7d34336c53affa4cb39557832d 100644 (file)
--- a/src/data.js
+++ b/src/data.js
@@ -22,7 +22,7 @@ jQuery.extend({
        },
 
        hasData: function( elem ) {
-               return !elem.nodeType || (elem[ jQuery.expando ] && !jQuery.isEmptyObject(jQuery.cache[ elem[jQuery.expando] ]));
+               return !elem.nodeType || (!!elem[ jQuery.expando ] && !jQuery.isEmptyObject(jQuery.cache[ elem[jQuery.expando] ]));
        },
 
        data: function( elem, name, data ) {

diff --git a/test/unit/data.js b/test/unit/data.js
index 1a0f84c1f7087a48814c5eacb705eed776f53097..204d979c345787795ec7135adfcb62716ea414ba 100644 (file)
--- a/test/unit/data.js
+++ b/test/unit/data.js
@@ -78,6 +78,15 @@ test("jQuery.data", function() {
        ok( jQuery.data( window, "BAD" ), "Make sure that the value was set." );
 });
 
+test("jQuery.hasData", function() {
+       var div = document.createElement( "div" );
+       equals( jQuery.hasData(div), false, "No data exists" );
+       jQuery.data( div, "foo", "bar" );
+       equals( jQuery.hasData(div), true, "Data exists" );
+       jQuery.removeData( div, "foo" );
+       equals( jQuery.hasData(div), false, "Data was removed" );
+});
+
 test(".data()", function() {
        expect(5);
 
@@ -180,7 +189,7 @@ test(".data(String) and .data(String, Object)", function() {
        equals( $elem.data('emptyString','').data('emptyString'), '', "Empty strings are preserved");
        equals( $elem.data('false',false).data('false'), false, "false's are preserved");
        equals( $elem.data('exists'), true, "Existing data is returned" );
-       
+
        // Clean up
        $elem.removeData();
        ok( jQuery.isEmptyObject( $elem[0] ), "removeData clears the object" );
@@ -191,7 +200,7 @@ test("data-* attributes", function() {
        var div = jQuery("<div>"),
                child = jQuery("<div data-myobj='old data' data-ignored=\"DOM\" data-other='test'></div>"),
                dummy = jQuery("<div data-myobj='old data' data-ignored=\"DOM\" data-other='test'></div>");
-               
+
        equals( div.data("attr"), undefined, "Check for non-existing data-attr attribute" );
 
        div.attr("data-attr", "exists");
@@ -199,10 +208,10 @@ test("data-* attributes", function() {
 
        div.attr("data-attr", "exists2");
        equals( div.data("attr"), "exists", "Check that updates to data- don't update .data()" );
-               
+
        div.data("attr", "internal").attr("data-attr", "external");
        equals( div.data("attr"), "internal", "Check for .data('attr') precedence (internal > external data-* attribute)" );
-       
+
        child.appendTo('#main');
        equals( child.data("myobj"), "old data", "Value accessed from data-* attribute");
 
@@ -249,7 +258,7 @@ test("data-* attributes", function() {
                .attr("data-space", " ")
                .attr("data-null", "null")
                .attr("data-string", "test");
-       
+
        strictEqual( child.data('true'), true, "Primitive true read from attribute");
        strictEqual( child.data('false'), false, "Primitive false read from attribute");
        strictEqual( child.data('five'), 5, "Primitive number read from attribute");
@@ -265,7 +274,7 @@ test("data-* attributes", function() {
        strictEqual( child.data('string'), "test", "Typical string read from attribute");
 
        child.remove();
-       
+
        // tests from metadata plugin
        function testData(index, elem) {
                switch (index) {
@@ -289,10 +298,10 @@ test("data-* attributes", function() {
                        ok(false, ["Assertion failed on index ", index, ", with data ", data].join(''));
                }
        }
-       
+
        var metadata = '<ol><li class="test test2" data-foo="bar" data-bar="baz" data-arr="[1,2]">Some stuff</li><li class="test test2" data-test="bar" data-bar="baz">Some stuff</li><li class="test test2" data-zoooo="bar" data-bar=\'{"test":"baz"}\'>Some stuff</li><li class="test test2" data-number=true data-stuff="[2,8]">Some stuff</li></ol>',
                elem = jQuery(metadata).appendTo('#main');
-       
+
        elem.find("li").each(testData);
        elem.remove();
 });
@@ -305,12 +314,12 @@ test(".data(Object)", function() {
        div.data({ "test": "in", "test2": "in2" });
        equals( div.data("test"), "in", "Verify setting an object in data" );
        equals( div.data("test2"), "in2", "Verify setting an object in data" );
-       
+
        var obj = {test:"unset"},
                jqobj = jQuery(obj);
        jqobj.data({ "test": "in", "test2": "in2" });
        equals( obj.test, "in", "Verify setting an object on an object extends the object" );
-       equals( obj.test2, "in2", "Verify setting an object on an object extends the object" ); 
+       equals( obj.test2, "in2", "Verify setting an object on an object extends the object" );
 });
 
 test("jQuery.removeData", function() {
@@ -324,13 +333,13 @@ test("jQuery.removeData", function() {
        jQuery.removeData( div );
        ok( !jQuery.data(div, "test2"), "Make sure that the data property no longer exists." );
        ok( !div[ jQuery.expando ], "Make sure the expando no longer exists, as well." );
-       
+
        var obj = {};
        jQuery.data(obj, "test", "testing");
        equals( obj.test, "testing", "verify data on plain object");
        jQuery.removeData(obj, "test");
        equals( jQuery.data(obj, "test"), undefined, "Check removal of data on plain object" );
-       equals( obj.test, undefined, "Check removal of data directly from plain object" );      
+       equals( obj.test, undefined, "Check removal of data directly from plain object" );
 
        jQuery.data( window, "BAD", true );
        jQuery.removeData( window, "BAD" );