jQuery if Element has an ID?

Like this:

var $aWithId = $('.parent a[id]');

Following OP's comment, test it like this:

if($aWithId.length) //or without using variable: if ($('.parent a[id]').length)

Will return all anchor tags inside elements with class parent which have an attribute ID specified

You can use jQuery's .is() function.

if ( $(".parent a").is("#idSelector") ) {
//Do stuff
}

It will return true if the parent anchor has #idSelector id.

You can do

document.getElementById(id) or 
$(id).length > 0

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