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Made isPlainObject() supporting null, undefined, and window values on IE too. Also added some related tests. Fixes #5669.

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This commit is contained in:
Robert Katic 2009-12-19 00:34:20 +08:00 committed by John Resig
parent 27d65b59f9
commit 148fb7ba8e
2 changed files with 20 additions and 5 deletions
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10
src/core.js
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@ -425,19 +425,21 @@ jQuery.extend({
}, },
isPlainObject: function( obj ) { isPlainObject: function( obj ) {
if ( toString.call(obj) !== "[object Object]" || typeof obj.nodeType === "number" ) { // Must be an Object.
// Because of IE, we also have to check the presence of the constructor property.
if ( !obj || toString.call(obj) !== "[object Object]" || !("constructor" in obj) ) {
return false; return false;
} }
// not own constructor property must be Object // Not own constructor property must be Object
if ( obj.constructor if ( obj.constructor
&& !hasOwnProperty.call(obj, "constructor") && !hasOwnProperty.call(obj, "constructor")
&& !hasOwnProperty.call(obj.constructor.prototype, "isPrototypeOf") ) { && !hasOwnProperty.call(obj.constructor.prototype, "isPrototypeOf") ) {
return false; return false;
} }
//own properties are iterated firstly, // Own properties are enumerated firstly, so to speed up,
//so to speed up, we can test last one if it is own or not // if last one is own, then all properties are own.
var key; var key;
for ( key in obj ) {} for ( key in obj ) {}

15
test/unit/core.js
View file

@ -204,12 +204,22 @@ test("trim", function() {
}); });
test("isPlainObject", function() { test("isPlainObject", function() {
expect(7); expect(14);
stop(); stop();
// The use case that we want to match // The use case that we want to match
ok(jQuery.isPlainObject({}), "{}"); ok(jQuery.isPlainObject({}), "{}");
// Not objects shouldn't be matched
ok(!jQuery.isPlainObject(""), "string");
ok(!jQuery.isPlainObject(0) && !jQuery.isPlainObject(1), "number");
ok(!jQuery.isPlainObject(true) && !jQuery.isPlainObject(false), "boolean");
ok(!jQuery.isPlainObject(null), "null");
ok(!jQuery.isPlainObject(undefined), "undefined");
// Arrays shouldn't be matched
ok(!jQuery.isPlainObject([]), "array");
// Instantiated objects shouldn't be matched // Instantiated objects shouldn't be matched
ok(!jQuery.isPlainObject(new Date), "new Date"); ok(!jQuery.isPlainObject(new Date), "new Date");
@ -231,6 +241,9 @@ test("isPlainObject", function() {
// DOM Element // DOM Element
ok(!jQuery.isPlainObject(document.createElement("div")), "DOM Element"); ok(!jQuery.isPlainObject(document.createElement("div")), "DOM Element");
// Window
ok(!jQuery.isPlainObject(window), "window");
var iframe = document.createElement("iframe"); var iframe = document.createElement("iframe");
document.body.appendChild(iframe); document.body.appendChild(iframe);