why is this simple fiddle not working

Question

This fiddle is not working-

http://jsfiddle.net/RcfNL/1/

I just want to add a text field in a div onchange in drop down . What's the problem?

Answer 1

您也可以交替变化的选项Frameworks and Extensions到onLoad选项，以便等待整个DOM是ready.Check你拨弄

Answer 2

You need to wrap your code in a document ready function .

$(document).ready(function() {
   ...
});

JSFiddle demo .

A page can't be manipulated safely until the document is "ready." jQuery detects this state of readiness for you. Code included inside $( document ).ready() will only run once the page Document Object Model (DOM) is ready for JavaScript code to execute.