Using the value of a checkbox in a jQuery Validation add method doesnt work [duplicate]

Question

I am attempting to use the value of a checkbox on a form to control the validation of other fields. But it seems that the value is always false inside the addmethod routine. I must be doing something wrong here but I can't see it.

My addmethod routine is this:

$.validator.addMethod('ValShort', function (value,element) 
{ 
  var isChecked = $("value").is(":checked");
  alert(isChecked);
  return true;
}, 'Please enter a rate for short sessions.');

I set the rule up like this:

rules: {
  Test: {ValShort: true}
},

Here is the form:

<form id="Modal-Update-Form" method="post">
    <table align="left" width="100%">
        <tr><td>test</td><td><input type="checkbox" name="Test" id="Test"  /><td></tr>
        <tr><td colspan="2" style="padding-bottom:3px;">
                <button type="submit" class="Button" name="Update">Update</button>
            </td></tr>
    </table>
</form>

No matter what I do, the checkbox always shows as false in the alert.

Any ideas on what I am doing wrong, or in how to get the checkbox state inside the addmethod routine?

$("value") selects an element like <value>. There is no such element in your form. — Barmar
– Barmar, Commented Apr 6 at 16:44
Your validation rule is on the checkbox Test. You said you wanted to use the rule to control validation of other fields. — Barmar
– Barmar, Commented Apr 6 at 16:46
"value" is the parameter that comes into the function from jQuery validation and would be Test in this usage. What notation should I use? — John P
– John P, Commented Apr 6 at 17:11
But this is still not using the checkbox when validating another field. It's essentially the same as Test: required — Barmar
– Barmar, Commented Apr 6 at 17:27

Fares Mohamed · Accepted Answer · 2025-04-07 17:48:39Z

0

The alert (isChecked) always returns false, even if the checkbox is flagged. This means the code can't determine the true state of the checkbox.

Wrong :

$("value").is(":checked");

Correct :

$("#Test").is(":checked");

Make Sure You Have $("#Test").

and if you don't want it for a specific element :

var isChecked = $(element).is(":checked");

answered Apr 7 at 17:48

Fares Mohamed

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