How to check undefined, empty and null in JavaScript/JQuery ?

By Hardik Savani | January 12, 2016 | | 72114 Viewer | Category : Javascript jQuery


If you are working on jquery and However you want to check variable is undefined or not then you can easily check by typeof operator, which is simple, fast and cross-platform:

if(typeof i == "undefined"){

alert('undefined');

}

If you are working on jquery and However you want to check variable is empty or not then you can easily check by compare with empty string:

if(i == ''){

alert('Empty');

}

If you are working on jquery and However you want to check variable is null or not then you can easily check by compare with "null":

if(i == null || i == NULL){

alert('null');

}

Try this......



Hardik Savani
My name is Hardik Savani. I'm a full-stack developer, entrepreneur and owner of Aatman Infotech. I live in India and I love to write tutorials and tips that can help to other artisan. I am a big fan of PHP, Javascript, JQuery, Laravel, Codeigniter, VueJS, AngularJS and Bootstrap from the early stage.
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