Question

105

JavaScript if var exists

rated 0 times [ 108] [ 3] / answers: 1 / hits: 18045 / 13 Years ago, thu, december 15, 2011, 12:00:00

I want my code so that if a specific var exists it will perform an action, else it will be ignored and move along. The problem with my code is, if the specific var does not exist it causes an error, presumably ignoring the remainder of the JavaScript code.

Example

var YouTube=EpicKris;



if ((typeof YouTube) != 'undefined' && YouTube != null) {

    document.write('YouTube:' + YouTube);

};

Answers

Only authorized users can answer the question. Please sign in first, or register a free account.

ashli

Add To Favorites

Follow

Total Points: 210

Total Questions: 94

Total Answers: 96

Location: Austria

Member since Sat, Jul 24, 2021

3 Years ago

answered 13 Years ago marib · Accepted Answer

Code:

var YouTube=EpicKris;



if (typeof YouTube!='undefined') {

    document.write('YouTube:' + YouTube);

};

Worked out the best method for this, use typeof to check if the var exists. This worked perfectly for me.