Edit in JSFiddle

$(function(){
    $('.target').dblclick(function() { // bind an event handler to the double-click event
        $(this).toggleClass('btn-primary');
        $('.log').append(' double-click-event');
    });
    
    $('.trigger').click(function() { // trigger the double-click event manually
        $('.target').dblclick();
        $('.log').append(' double-click-trigger');
    });
});

<div class="well">
    <p>
        <span class="target btn btn-primary">double-click me</span>
        <span class="trigger btn btn-inverse">click me to trigger double-click event manually</span>
    </p>
    <div class="log alert alert-block">log</div>
</div>