How to handle getElementById return Null

Question

On our web application there are many pages. Some of them contain element \"Ribbon.ListForm.Display.Manage.Workflows-Medium\" while some pages not.

I would like to use s

Answer 1

You can check like this for null element:

if (edit!=null && edit.value == '') 
if (wf!=null && wf.value == '')
if (checkout!=null && checkout.value == '')