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
– CertainPerformance, Commented Apr 13, 2018 at 4:09
Possible duplicate of jQuery see if any or no checkboxes are selected — Rafael Herscovici
– Rafael Herscovici, Commented Apr 13, 2018 at 4:18

Mamun · Accepted Answer · 2018-04-13 04:21:30Z

2

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()" />

answered Apr 13, 2018 at 4:21

Mamun

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