Checking for null is not working in javascript

Question

I have this very simple code to check whether the value is null or not but, it is not working and passing through the 'if' condition.

enter image description here

Code:

var existingFilterCriteria = filterCriteriaSectionRow.data('filterapplied');

if (existingFilterCriteria != null && existingFilterCriteria != '' && existingFilterCriteria != 'null');
{
    MappingQueryFilter = existingFilterCriteria;
}

Question:

Am I doing anything wrong here? Is there any special check I have to do for data returned from the 'data' attribute in a DOM element?

What is the value of filterCriteriaSectionRow.data('filterapplied')? What is the expected output? How do you define "working"? — Josh Beam
– Josh Beam, Commented Jun 23, 2015 at 17:33
Also, the code you showed in the screenshot of the code is different than the code you copied and pasted. For example, != and !== are by no means the same thing. — Josh Beam
– Josh Beam, Commented Jun 23, 2015 at 17:34
@JoshBeam, I agree. I was trying different options to capture the null check. Let me update the code. — JGV
– JGV, Commented Jun 23, 2015 at 17:38

brso05 · Accepted Answer · 2015-06-23 17:37:35Z

5

You have a ; at the end of your if statement.

answered Jun 23, 2015 at 17:37

brso05

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5 Comments

Bhojendra Rauniyar Over a year ago

Yeah, that's the problem but still it should be or operator than and operator.

loli Over a year ago

@Bhojendra Nepal why? what if the value is '''. He would still go inside when he doesn't want to

Bhojendra Rauniyar Over a year ago

NO, both case wouldn't match anytime as null !== ''

JGV Over a year ago

@brso05, you care correct. The semicolon (;) was causing the issue. After I removed it, things started to work fine. I don't know how I missed it. Thanks for catching it.

brso05 Over a year ago

@BhojendraNepal he only wants to execute the block of code if existingFilterCriteria contains something a non null non empty string...

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