Question

Here is the jquery I am testing:

var length = $('#showLBVRBVVol').length;
if(length != 0) {
   console.log('test');
}

This throw an error of undefined

What is interesting is this works:

var length = $('#showLBVRBVVol').length;
if(length == 0) {
   console.log('test');
}

The above will correctly log ‘test’. Is there something I am doing wrong that the first option is not working but the second one is?

The element is dynamically added if it is needed otherwise it doesn’t exist. I need to be able to tell the difference between the two.

EDITED:

http://jsfiddle.net/d6dZG/

Answer 1

I think you want check whether it exists or not, so to check existence of '#showLBVRBVVol' element

if($('#showLBVRBVVol').length) // if true
{
    console.log('exists'); // Output: 'exists' only when if condition is true
}

if it exists then it will return 1 (boolean true) otherwise 0 (boolean false)