How to detect IE/Edge using javascript?

I am trying to use javascript to apply a certain style to the pages based on which browser the user is using. I can detect all of the browsers except for IE/Edge. In my code snippet I am just trying to detect IE/Edge and apply the style.

Here is my code:

var bodyStyle = document.querySelector("#bodyArea");
if((navigator.userAgent.indexOf("Edge") != -1 ) || (!!document.documentMode == true ))
    alert("asdf"); = "500px";
{ = "300px";

When I put an alert in the else section it gives me an alert, but it doesn't work on the if part. So I think my problem is occurring when I try to detect IE/Edge. Or if it lay elsewhere, let me know. If anyone has any feedback, it will be greatly appreciated. Thanks in advance!


You can use this custom script to detect IE/Edge:

if (/MSIE 10/i.test(navigator.userAgent)) {
   // this is internet explorer 10

if(/MSIE 9/i.test(navigator.userAgent) || /rv:11.0/i.test(navigator.userAgent)){
    // this is internet explorer 9 and 11
    window.location = 'pages/core/ie.htm';

if (/Edge\/12./i.test(navigator.userAgent)){
   // this is Microsoft Edge
   window.alert('Microsoft Edge');

Check out this page for the latest IE and Edge user agent strings:

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