How can I detect if a selector returns null

0 votes

What is the best way to detect if a jQuery-selector returns an empty object. If you do:

alert($('#notAnElement'));

you get [object Object], so the way I do it now is:

alert($('#notAnElement').get(0));

which will write "undefined", and so you can do a check for that. But it seems very bad. What other way is there?

Oct 5, 2020 in JQuery by kartik
• 37,500 points
1,316 views

1 answer to this question.

0 votes

Hello @kartik,

My favourite is to extend jQuery with this tiny convenience:

$.fn.exists = function () {
    return this.length !== 0;
}

Used like:

$("#notAnElement").exists();

More explicit than using length.

Hope it helps!!
Thank you!!

answered Oct 5, 2020 by Niroj
• 82,740 points

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