About jQuery append() and how to check if an element has been appended

Question

I made a very simple button click event handler, I would like to have

element be appended when button clicked, you can check my code

Answer 1

1) jsFiddle loads in MooTools by default, you need to include jQuery for this to work. There is not a reason in the world why that example wouldn't work. (Assuming that the $ is actually mapped to the jQuery object, that is.)

2) You can check the nextSibling of a DOMElement, or use the next() jQuery method, like so:

if(!$('#something').next().length) {
   //no next sibling.
}