YUI Library Examples: YAHOO Global Object: Type-Checking Your Data

YAHOO Global Object: Type-Checking Your Data

The Yahoo Global Object includes several useful type-checking methods in the YAHOO.lang object. Click the Check button in each row to evaluate the data.

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Data	isObject	isArray	isFunction
`null`
`[] or new Array()`
`{} or new Object()`
`function Foo() {}`
`new Foo()`
`elem.getElementsByTagName('p')`
`YAHOO.util.Dom. getElementsByClassName( 'foo','p',elem)`

YAHOO.lang comes with YAHOO

YAHOO.lang comes bundled with the YAHOO Global Object.


1	<script type="text/javascript" src="http://yui.yahooapis.com/2.5.1/build/yahoo/yahoo-min.js"></script>
	view plain \| print \| ?

If you are using any other YUI components on your page, you should already have YAHOO.lang available.

Checking types

In this example, we use a few of the type-checking methods available in YAHOO.lang to test various types of data.


1	// Test the input using YAHOO.lang type checking methods
2	YAHOO.example.checkType = function (val) {
3	return {
4	'object' : YAHOO.lang.isObject(val),
5	'array' : YAHOO.lang.isArray(val),
6	'function': YAHOO.lang.isFunction(val)
7	};
8	}
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Other type checking methods

YAHOO.lang currently supports the following type checking methods:

YAHOO Global Object Examples:

More YAHOO Global Object Resources:

User's Guide (external)
API Documentation