jquery multiple class selector
<p>I am trying to attach a click event handler on a button but it doesn't call the click event on the button. I guess I am using wrong selectors. Can anybody help me out?</p>

<p>The HTML:</p>

<pre><code>&lt;button type="submit" class="btn btn-primary btn-block mb20 submitForm" onclick="RemoveValidation()"&gt;Search&lt;/button&gt;
</code></pre>

<p>And here is the JQuery:</p>

<pre><code>$("#txtZip").keyup(function (event) {
    debugger;
    if (event.keyCode == 13) {
        $(".btn .submitForm").click();
    }
});
</code></pre>