PhantomJS; click an element

Question

How do I click an element in PhantomJS?

page.evaluate(function() {
    document.getElementById(\'idButtonSpan\').click();  
});

This gives

Answer 1

With 1.9.2 this worked for me, click handlers were triggered:

var a = page.evaluate(function() {
    return document.querySelector('a.open');
});

page.sendEvent('click', a.offsetLeft, a.offsetTop);