Trigger Bootstrap Dropdown with JS

Question

I need to open a Bootstrap dropdown menu via JavaScript. This answer suggests adding and removing the open class, but when I try that, nothing happens. Adding a different class works fine. Is Bootstrap preventing me from doing this?

Working sample on JSFiddle.

HTML

<input type="button" value="Add Classes" />
<div class="dropdown">
    <a data-toggle="dropdown" href="#">Dropdown Trigger</a>
    <div class="dropdown-menu">Dropdown Content</div>
</div>

JS

$('input').click(function () {
    $('.dropdown').addClass('open');
    $('.dropdown').addClass('test-class');
});

Answer 1

Your main problem is that you aren't stopping the click event from propagating to the document. Bootstrap sets an event listener on the document that closes dropdowns.

$('input').on('click', function (e) {
    e.stopPropagation();
    $(this).next('.dropdown').find('[data-toggle=dropdown]').dropdown('toggle');
});

jsFiddle - http://jsfiddle.net/8p6Wd/2/