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jQuery Check Undefined or Empty Value | Check Value Undefined or Null in jQuery

Nov 17, 2013
Introduction

Here I will explain how to check undefined or empty value in
jQuery or jQuery to check undefined variable value or empty value or null value.


To check undefined values in jQuery we need use type of operator for that we need to write the code like as shown below


<script type="text/javascript">
$(function() {
var UserName = $.cookie("UserName");
if (UserName != '' && typeof UserName != 'undefined') {
alert(QuestionId);
}
})
</script>

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3 comments :

Anonymous said...

thanks for posting such a nice article!

Cross Platform Android development Houston TX said...

Great Info. Thanks for the your effort. Appreciate it.

Vaibhav Shah said...

Cant we check like this ?

if (UserName != "' && UserName != undefined && UserName != null)
{
// do something
}

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