javascript - conditional form validation using jquery.validate.js plugin - Stack Overflow

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Can anyone tell me how to write a rule that validates if neither one radio button option nor the (optinal) textfield is chosen/filled by a user? The rule should only give a message if no checkbox option #myradiogroup is chosen AND the textfield #email2 is empty.

My form code:

<form name="my" id="myForm" action="" method="post">

<input type="radio" name="myradiogroup" id="myradiogroup" value="option 1" /> option 1
<input type="radio" name="myradiogroup" id="myradiogroup" value="option 2" /> option 2

<label for="emailNew4use">this is an optional field:</label>
<input type="text" name="email2" id="email2" />

<input type="submit" value="send">

</form>

Can anyone tell me how to write a rule that validates if neither one radio button option nor the (optinal) textfield is chosen/filled by a user? The rule should only give a message if no checkbox option #myradiogroup is chosen AND the textfield #email2 is empty.

My form code:

<form name="my" id="myForm" action="" method="post">

<input type="radio" name="myradiogroup" id="myradiogroup" value="option 1" /> option 1
<input type="radio" name="myradiogroup" id="myradiogroup" value="option 2" /> option 2

<label for="emailNew4use">this is an optional field:</label>
<input type="text" name="email2" id="email2" />

<input type="submit" value="send">

</form>

• javascript
• jquery
• jquery-validate

Share Improve this question Follow edited Mar 5, 2014 at 0:13 apaul 16.2k88 gold badges4949 silver badges8282 bronze badges asked Sep 19, 2013 at 14:39 michbeckmichbeck 74533 gold badges1111 silver badges1717 bronze badges 2

• it would have been really helpful if you had been much clearer in what you were expecting as an answer – hima Commented Sep 19, 2013 at 15:42
• 1 You should also show your .validate() code. – Sparky Commented Sep 19, 2013 at 15:42

Add a ment  | 

2 Answers 2

Sorted by: Reset to default 5

The required parameter in jQuery Validate can take a function.

$('#myForm').validate({
    rules: {
        email2: {
            required: function(element) {
                if ($('[name="myradiogroup"]:checked').length) {
                    return false;
                } else {
                    return true;
                }
            }
        },
        myradiogroup: {
            required: function(element) {
                if ($('#email2').val()) {
                    return false;
                } else {
                    return true;
                }
            }
        }
    }
});

---

Here's a condensed version from Sparky

$('#myForm').validate({
    rules: {
        email2: {
            required: function(element) {
                return !$('[name="myradiogroup"]:checked').length;
            }
        },
        myradiogroup: {
            required: function(element) {
                return !$('#email2').val();
            }
        }
    }
});

maybe can this:

$('#myForm').submit(function() {
    if($('input:radio').val() == '' || $('#email2').val() == '') {
        preventDefault();
        // show error
    }
}

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