jquery null value checking methods

Question

Among the following two code, which is the best method to check a null item in jquery. What are the differences? or can you suggest any other best method?.

if(!$('#id').val()){
  //code
}

or

if($('#id').val()==''){
  //code
}

The first one, by the way the second one is unsafe equality, === is better — zb22, Feb 12 '18 at 07:10

score 0 · Accepted Answer · answered Feb 12 '18 at 07:11

0

"" is by default a falsy value, and .val() if element exists and the value is blank will return ""

!"" will equate to true so your first approach should be just fine.

answered Feb 12 '18 at 07:11

void

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107

Care to explain the downvotes? – void Feb 12 '18 at 07:12

score -1 · Answer 2 · answered Feb 12 '18 at 07:15

-1

I think this below method is best

if($('#id').val()==''){
  //code
}

And Also Try this also

if($('#id').val().length == 0){
      //code
    }

answered Feb 12 '18 at 07:15

Saurabh Pandya

1
1

Can you explain your choice ? – Striped Feb 12 '18 at 07:18
First One is best – Saurabh Pandya Mar 06 '18 at 10:54

jquery null value checking methods

2 Answers2