How Can I Detect Internet Explorer Usage Within Event Listeners?

Determining Internet Explorer Usage in Event Listeners

Introduction

When attaching event listeners to specific elements, it may be necessary to check whether the user is currently using Internet Explorer (IE) to execute particular actions or disable the functionality for other browsers. This article explores methods to achieve this and provides solutions for various scenarios.

Detecting IE Usage in Event Functions

To determine if the event was triggered within IE, you can utilize the documentMode property. This property is only available in IE and returns the current version of the browser's rendering engine. The following code sample demonstrates this approach:

$('.myClass').on('click', function(event) {
  //Abort the function if not in IE
  if (!document.documentMode) {
    return;
  }

  //Execute IE-specific actions here
});

Checking Specific IE Versions

In cases where you only need to check for IE11 or higher versions, you can use the UAParser.js library to extract detailed information about the user's browser, including its version. The following code illustrates this method:

$(document).ready(function() {
  //Parse user agent string to determine user's browser
  var parser = new UAParser();
  var uaInfo = parser.getResult();

  // Handle the event listeners based on the UA information
  if (uaInfo.browser.family === 'Microsoft Edge') {
    //Do something for IE
  } else if (uaInfo.browser.family === 'IE' && uaInfo.browser.major >= 11) {
    //Do something for IE11+
  }
});

Considerations for Edge Browser

In recent years, the Microsoft Edge browser has transitioned to using the Chromium rendering engine. To handle Edge correctly in your checks, you can utilize the following code snippet:

if (navigator.userAgent.includes('Edge')) {
  //Handle the Edge browser here
}

Legacy Approach (Pre-Chromium Edge)

Before the Chromium transition, Edge exhibited different User Agent (UA) strings. Here is a function that can still detect IE11 and older versions:

function detectIE() {
  var ua = window.navigator.userAgent;
  var msie = ua.indexOf('MSIE ');
  var trident = ua.indexOf('Trident/');

  //Return IE version or false based on the UA string
  if (msie > 0) {
    return parseInt(ua.substring(msie + 5, ua.indexOf('.', msie)), 10);
  } else if (trident > 0) {
    return parseInt(ua.substring(rv + 3, ua.indexOf('.', rv)), 10);
  } else {
    return false;
  }
}

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