SO - 14766894

by Arun P Johny

HTML

<label class="checkbox">
    <input type="checkbox" id="isNews" name="isNews"/>If you want send news:
</label>
<label for="newsSource" class="ilable">news source</label>
<input id="newsSource" name="newsSource" class="input-xlarge" disabled="" type="text" placeholder="news source"/>

JavaScript

$('#isNews').change(function(){
   $("#newsSource").prop("disabled", !$(this).is(':checked'));
});