Checking if any checkbox array items have been checked

Question

I have checkboxes that have an array name checker[] and I want my function to tell me, when unchecking any box, if any of the checkboxes with that name are checked. Can't figure it out.

function doStuff() {
  if (document.forms.theForm.elements.checker[].checked == false)
   alert('none checked');
}

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>

<form name="theForm">
<input type="checkbox" name="checker[]" value="1" onclick="doStuff()"> 
<input type="checkbox" name="checker[]" value="2" onclick="doStuff()">
</form>

`Can't figure it out.` Post what you *have* tried for debugging, else this is liable to be closed for a `write-my-code-for-me-from-scratch` question — CertainPerformance, Apr 13 '18 at 04:09
Possible duplicate of [jQuery see if any or no checkboxes are selected](https://stackoverflow.com/questions/4086957/jquery-see-if-any-or-no-checkboxes-are-selected) — Rafael Herscovici, Apr 13 '18 at 04:18

score 2 · Accepted Answer · answered Apr 13 '18 at 04:21

You can check the length property of checked Check Boxes:

$('input[name="checker[]"]:checked').length

function doStuff() {
  var len = $('input[name="checker[]"]:checked').length;
  if (len === 0 )
   alert('none checked');
}

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<input type="checkbox" name="checker[]" value="1" onclick="doStuff()" /> 
<input type="checkbox" name="checker[]" value="2" onclick="doStuff()" />

worked perfectly, thanks! `[+1]` – kapitan Dec 03 '21 at 00:42 — kapitan, Dec 03 '21 at 00:42

Checking if any checkbox array items have been checked

1 Answers1