jQuery.isFunction()
Categories: Utilities
jQuery.isFunction( obj )Returns: boolean
Description: Determine if the argument passed is a Javascript function object.
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jQuery.isFunction( obj )
version added: 1.0obj Object to test whether or not it is a function.
Note: As of jQuery 1.3, functions provided by the browser like alert()
and DOM element methods like getAttribute()
are not guaranteed to be detected as functions in browsers such as Internet Explorer.
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Test a few parameter examples.
HTML:
<div>jQuery.isFunction(objs[0]) = <span></span></div> <div>jQuery.isFunction(objs[1]) = <span></span></div> <div>jQuery.isFunction(objs[2]) = <span></span></div> <div>jQuery.isFunction(objs[3]) = <span></span></div> <div>jQuery.isFunction(objs[4]) = <span></span></div>
CSS:
div { color:blue; margin:2px; font-size:14px; } span { color:red; }
Code:
function stub() { } var objs = [ function () {}, { x:15, y:20 }, null, stub, "function" ]; jQuery.each(objs, function (i) { var isFunc = jQuery.isFunction(objs[i]); $("span").eq(i).text(isFunc); });
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Finds out if the parameter is a function.
Code:
$.isFunction(function(){});
Results:
true