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Fixes #13571. jQuery.isPlainObject 1.9.x compatibility

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Signed-off-by: Rick Waldron <waldron.rick@gmail.com>
This commit is contained in:
Rick Waldron 2013-03-06 14:42:24 -05:00
parent 49abe3dc92
commit 8d1c42296f
2 changed files with 49 additions and 5 deletions
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11
src/core.js
View File

@ -422,8 +422,11 @@ jQuery.extend({
},
isPlainObject: function( obj ) {
var key;
// Not plain objects:
// - Any object or value whose internal [[Class]] property is not "[object Object]"
// ...Unless it was a constructor, whose prototype property was paved over by
// by a plain object at its declaration. #13571
// - DOM nodes
// - window
if ( jQuery.type( obj ) !== "object" || obj.nodeType || jQuery.isWindow( obj ) ) {
@ -442,9 +445,11 @@ jQuery.extend({
return false;
}
// If the function hasn't returned already, we're confident that
// |obj| is a plain object, created by {} or constructed with new Object
return true;
// Own properties are enumerated firstly, so to speed up,
// if last one is own, then all properties are own.
for ( key in obj ) {}
return key === undefined || core_hasOwn.call( obj, key );
},
isEmptyObject: function( obj ) {

43
test/unit/core.js
View File

@ -296,9 +296,9 @@ test("type", function() {
});
asyncTest("isPlainObject", function() {
expect(15);
expect(16);
var pass, iframe, doc,
var pass, iframe, doc, c, extended,
fn = function() {};
// The use case that we want to match
@ -360,6 +360,45 @@ asyncTest("isPlainObject", function() {
} catch(e) {
window.iframeDone( Object, "iframes not supported" );
}
// #13571
function C() {}
C.prototype = {
x: 1
};
c = new C();
extended = jQuery.extend( true, {}, {
target: c
});
strictEqual(
extended.target, c,
"Instances, whose constructor defined its prototype by assigning a plain object, " +
"will lie about their true identity to preserve a broken user-code expectation"
);
//
// The test above is broken and tests a broken feature, to support a misinformed
// assumption, as documented here:
//
// http://bugs.jquery.com/ticket/13571#comment:4
//
// It will not pass if the object being assigned as the prototype
// has no properties:
//
// function C() {}
// C.prototype = {};
// c = new C();
// extended = jQuery.extend( true, {}, {
// target: c
// });
// strictEqual( extended.target, c, "Undetectable, will fail every time" );
//
// The solution is to reset the constructor property of your plain object prototypes.
//
//
});
test("isFunction", function() {