html5 validation on invalid event listener not firing

Question

I have a form in my html with following markup

<form>
    <input type="text" name="fname" required>
    <input type="submit" value="Submit">
</form>

I also have 2 script tags one for jquery and the other for my javascript which I call validate.js

<script src="jquery-2.1.4.min.js"></script>
<script src="validate.js"></script></body>

When I put the following code into my validate.js file and submit invalid data. The page alerts 'invalid' as expected.

$("form input").on("invalid", function() {
     alert("invalid");
});

When I use this code in validate.js instead, when I click on the input the page again behaves as expected this time alerting 'click'.

$("body").on("click", "form input", function(){alert("click");});

However the following code does not work. When invalid data is submitted the invalid event handler does not fire and 'invalid' is not alerted as it should be.

$("body").on("invalid", "form input", function(){alert("invalid");});

I would like to do it this way because in my application I add a form to my page from an ajax request and therefore I want to attach the event handler to the body rather than the form itself. Is there any reason why this is not working?

Answer 1

$("body").on("invalid", "form input", function(){alert("invalid");}); This might not work because this is a live event, where the event is attached to body and triggers invalid for body and not for form input.

$("body").on("click", "form input", function(){alert("invalid");}); For example if we change it to click, the event listens to body click and then propagates the event to form input.

Try using the direct selector.