How to check if an object with an ID already exists on the page? [duplicate]

Question

Possible Duplicate:
Is there an “exists” function for jQuery

Say for instance you have the div:

<div id="hello"></div> 

And you are dynamically creating a div:

<div id="hello"></div> 

Is there a function you can use in Jquery which will check to see if the object with the ID you are trying to create already exists on the page?

Answer 1

For jQuery method you could go with

if($("#selector").length) {     //object already exists } 

Answer 2

if (document.getElementById('hello')) {     // yup, already there } 

Or, the jQuery way:

if ($('#hello').length) {     // yup, already there }