How to check whether an element exists using jQuery :: Aaron Russell

How to check whether an element exists using jQuery :: Aaron Russell

isset(), empty(), is_null(), == null

Despite using PHP every day, I had confusion among the above function (empty() and isset() are language constructs)
After some experience with Zend framework, I now use

isset($var)

defined(CONST)

and

null === func()

i could have replaced that with

if (func())

but none of my functions return false, 0, '' in case of an error