How to check if a variable is undefined in JavaScript
The proper way to check if a variable exists in JavaScript. The following code does it:
if( typeof yourVariable === 'undefined' ) {
// Your variable is undefined
}
Home / Tips / Programming languages / Scripting languages / JavaScript / How to check if a variable is undefined in JavaScript
Read also
Log in or create a user account to post a comment.
The most viewed tips
A simple way to open YouTube videos in jQuery Fancybox 5544111101376
How to make a page redirect in JavaScript? 2139138001663
