How to change the value of a checkbox when it is checked or unchecked

Jonas Dulay

Hi all, here's the question. I want to perform other calculations based on checkboxes.

<div>
 COD: <input type="checkbox" id="trigger" name="question" >
</div>

this is the javascript used to calculate the price of the item the problem is that i don't know how to do the else if method

<script>
    $("#price,#quant,#shipment").keyup(function () {
      if(+myFunction3() =="" )
      {
        $('#demo').val(0);
      }
      else if($('#trigger')=="checked") //this is the problem
      {
        $('#demo').val($('#price').val() * $('#quant').val() ;
      }
      else
      {
      $('#demo').val($('#price').val() * $('#quant').val() + +myFunction3());
     }
  });
  </script>

Thank you in advance.

Jacob Peterson

With jQuery you can do the following:

else if($('#trigger:checked').length > 0)

or

else if($('#trigger').is(':checked'))

If you want to rerun the calculation when the user checks or unchecks the checkbox, you can run the same code that runs on the keyup function on the following keyboard:

$('#trigger').change(function() {
  ...
})

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