don’t let duplicate ajax field

I need someone to help me not to let me create duplicate names. In real time. In case of duplicate give a duplicate alert and not submit the registration.

<?php $test3 = get_post_meta( get_the_ID(), ‘itunes_songs’, true ); ?>

<input class=”textfield” id=”test2″ type=”text” data-type=”text” name=”test” value=”<?php echo $test3 ?>” size=”40″ >

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