Jquery - Object.id Is Undefined When It Shouldn't Be

I'm working with JQuery and i'm running into this strange (or perhaps stupid) error. In my HTML I have:

Solution 1:

o is a reference to a jQuery object, NOT a DOM element reference. Inside your validateRepeatPassword function do:

alert( $(o).attr('id') );

If you want to access the direct DOM element's property from the jQuery object,

alert( o[0].id )

alert( o.get(0).id );

Solution 2:

Inside your function o is a jQuery object, you should grab the id with the attr function of of o.

alert(o.attr('id'));

But if you want to work directly with the DOM element on your validateRepeatPassword function, you can pass a reference to the element:

validateRepeatPassword($('#id_repeatPassword').get(0));