Set input as invalid

Question

In the HTMLInputElement interface, there is no such property as valid or invalid.

You can use the setCustomValidity(error) method with native form validation.

As for your script, here’s a demo that should work in all HTML5 compliant browsers:

$('input[name=pass2]').keyup(function () {
    'use strict';

    if ($('input[name=pass]').val() === $(this).val()) {
        $('#pass_hint').html('match');
        this.setCustomValidity('');
    } else {
        $('#pass_hint').html('mismatch');
        this.setCustomValidity('Passwords must match');
    }
});

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<form action='#'>
    <p>Password:
        <input name=pass type=password required>
    </p>
    <p>Verify:
        <input name=pass2 type=password required>
    </p>
    <p id=pass_hint></p>
    <button type=submit>Submit</button>
</form>

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