jQuery UI Boilerplate
A simple jquery ui boilerplate setup.
HTML
<div class='form'>
<form>
<div>
<label>Suche</label>
<input id='text' placeholder="Suchbegriff" />
</div>
<input id="submit" type="button" value="los" disabled />
</form>
</div>
JavaScript
var text = $('#text');
var submit = $('#submit');
$('#text').on('input', function() {
if (text.val()) {
submit.attr('disabled', false);
} else {
submit.attr('disabled', true);
}
});