Not Equal to Null condition in JavaScript

Question

I am using this code on a button in Salesforce -- onClick JavaScript :

Is this is the correct way:

if('{!Account.CSS_CustomerID__c}' != 'null'){

          //do something
}

Should I do like this --1

 if('{!Account.CSS_CustomerID__c}' != null){

              //do something
    }

Should I do like this --2

 if('{!Account.CSS_CustomerID__c}' !== null){

              //do something
    }

Or there is any other way?

ANSWER : This worked for me

 if('{!Account.CSS_CustomerID__c}' !== null){

              //do something
    }

You are comparing `string` with `string` which is un-identical.. — Rayon, Nov 19 '15 at 14:21
it is obvious that first string is not equal to second one, or you did not explain well.. — Zohaib Ijaz, Nov 19 '15 at 14:21
I gone through the existing Question .... But I am not able to find out how to check for NOT EQUAL TO NULL CONDITION there — Salesforce Steps, Nov 19 '15 at 14:30

score 1 · Answer 1 · answered Nov 19 '15 at 14:22

1

With your code you compare two string.

Maybe you need to compare the variable :

if(!Account.CSS_CustomerID__c != null)

answered Nov 19 '15 at 14:22

R3tep

Can you give me the exact syntax for above if condition – Salesforce Steps Nov 19 '15 at 14:29
http://www.w3schools.com/js/js_comparisons.asp – R3tep Nov 19 '15 at 14:40

1 Answers1