How to signup to run a code after the name/method has been defined using jQuery?

Question

I am trying to run a code but I get

$.uniform is undefined
[Break on this error] $.uniform.restore("#f_variedbyoperator"); 

How can I use jQuery, to detect if .uniform has been defined? And to signup the code to run after that.

Answer 1

The same way you'd test any other property:

• $.hasOwnProperty('uniform') (true if it is defined), or
• typeof $.uniform === 'undefined' (true if it is not defined), or
• !!$.uniform (true if it is a truthy value - anything other than undefined, null, 0, false, or '' - the empty string)

What do you mean "signup the code to run?"

---

var i = setInterval(function ()
{
    if ($.uniform)
    {
        clearInterval(i);
        $.uniform.restore("#f_variedbyoperator");
    }
}, 1000); // check for $.uniform every 1000 ms

Answer 2

If all you want to do is check that an element exists, try:

if($('element').length)
{
  // exists!
}