Check if user is using IE

Question

I am calling a function like the one below by click on divs with a certain class.

Is there a way I can check when starting the function if a user is using Internet

Answer 1

I landed on this page in 2020, and I see that till IE5 all userAgent string have Trident, I'm not sure if they have changed anything. So checking only for Trident in the userAgent worked for me.

var isIE = navigator.userAgent.indexOf('Trident') > -1;