Question

if you got something like this:

jQuery(selector).focus(function(){...});
jQuery(selector).focus(function(){...});

the focus will trigger twice, is there anyway that I can correct/prevent that?

Answer 1

Use the data('events') to find event handlers:

var isBound = function(el, ev) {
    var found = false;
    $.each($(el).data("events"), function(i, e) {
        if (i === ev) {
            found = true;
        }
    });
    return found;
}

if (!isBound(selector, 'focus')) {
    $(selector).bind('focus', fn);
}

I think you can use the .one() function in jQuery too, have a look at http://api.jquery.com/one/