Test for empty jQuery selection result

Question

Say I do

var s = $(\'#something\');

and next I want to test if jQuery found #something, i.e. I want to test if s is empty.

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Answer 1

An even more jQueryesque solution for me is:

jQuery.fn.isEmpty = function(fun){ if (this.length === 0) { fun(); } return this; };

This lets me write in typical fashion:

$("#sel").fadeOut(500,afterFade).isEmpty(insteadOfFade);

Answer 2

if($("#something").length > 0 ){
     // Element found
}
else{
    // No element found
}

Answer 3

Use the s.length property.

if(s.length == 0) {
    ...
}

[edit] size() deprecated in jquery 1.8 http://api.jquery.com/size/