fadeIn / fadeOut based on a boolean

Question

I was wondering if I really have to write:

if (status) {
    $(\'#status-image-\' + id).fadeIn();
} else {
    $(\'#status-image-\' + id).fadeOut();
}


        

Answer 1

No, there is not, but you can make one like that:

jQuery.fn.fadeInOrOut = function(status){
    return status ? this.fadeIn() : this.fadeOut();
}

and then call it like that (see this jsfiddle for a proof):

$('#status-image-' + id).fadeInOrOut(status);

Is it what you wanted?

Answer 2

The shortest way I know of to write this, but one I find personally abhorrent, is this:

$('#status-image-' + id)[status ? 'fadeIn' : 'fadeOut']();

You can of course just add the proposed function straight to jQuery:

(function($) {
    $.fn.fade = function() {
        var args = Array.prototype.slice.call(arguments);  
        var status = args.shift();
        var func = status ? 'fadeIn' : 'fadeOut';
        return $.fn[func].apply(this, args);
    };
})(jQuery);

This is untested - I just knocked it up on the spot.

The first argument supplied will be your status parameter - the remaining arguments will be passed through to .fadeIn() or .fadeOut().