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

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csnover committed Dec 22, 2010
1 parent 445fdf7 commit f5d4bf8920868c2d1f88cc4f3bfcf85c0b566b2e
Showing with 22 additions and 13 deletions.
  1. +1 −1 src/data.js
  2. +21 −12 test/unit/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 ) {
@@ -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" );
@@ -191,18 +200,18 @@ 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");
equals( div.data("attr"), "exists", "Check for existing data-attr attribute" );

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" );

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