document.getelementbyId will return null if element is not defined?

Question

In my code, I see this:

if (document.getElementById('xx') !=null) {     //do stuff } 

if xx element is not defined, will this evaluate to true or false?

Should I write:

if (document.getElementById('xx')) 

to be safe?

Answer 1

console.log(document.getElementById('xx') ) evaluates to null.  document.getElementById('xx') !=null evaluates to false 

You should use document.getElementById('xx') !== null as it is a stronger equality check.