Not Equal to Null condition in JavaScript [duplicate]

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
– Rayon, Commented Nov 19, 2015 at 14:21
it is obvious that first string is not equal to second one, or you did not explain well.. — Zohaib Ijaz
– Zohaib Ijaz, Commented Nov 19, 2015 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
– Salesforce Steps, Commented Nov 19, 2015 at 14:30

R3tep · Accepted Answer · 2015-11-19 14:22:34Z

1

With your code you compare two string.

Maybe you need to compare the variable :

if(!Account.CSS_CustomerID__c != null)

answered Nov 19, 2015 at 14:22

R3tep

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2 Comments

Can you give me the exact syntax for above if condition