How Can I Detect Internet Explorer 8 or Higher in JavaScript and Run a Function Accordingly?

Internet Explorer Detection and Its Applicability in Custom Functions

You have a function that you want to execute only for users with Internet Explorer 8 or higher. How can you verify if a user is using IE before running the function?

Browser Detection in JavaScript

You can check for IE by examining the User Agent string, which provides information about the browser. Here's a straightforward approach:

if (window.document.documentMode) {
    // Do IE stuff
}

This condition checks if the documentMode property exists, which is specific to IE. If it does, the browser is using IE.

Using a Helper Function for Browser Detection

In cases where checking multiple browsers is necessary or to make the code more reusable, a helper function can be helpful:

function detectIEEdge() {
    var ua = window.navigator.userAgent;

    var msie = ua.indexOf('MSIE ');
    if (msie > 0) {
        return parseInt(ua.substring(msie + 5, ua.indexOf('.', msie)), 10);
    }

    var trident = ua.indexOf('Trident/');
    if (trident > 0) {
        var rv = ua.indexOf('rv:');
        return parseInt(ua.substring(rv + 3, ua.indexOf('.', rv)), 10);
    }

    var edge = ua.indexOf('Edge/');
    if (edge > 0) {
        return parseInt(ua.substring(edge + 5, ua.indexOf('.', edge)), 10);
    }

    return false;
}

You can then use this function in your event listener as follows:

$('.myClass').on('click', function(event) {
    if (detectIEEdge()) {
        // Do IE stuff
    }
});

Conclusion

By incorporating these browser detection techniques, you can tailor your functions to execute only when specific conditions are met, such as when a user is using Internet Explorer. This ensures that your code behaves as intended and provides a better user experience.

The above is the detailed content of How Can I Detect Internet Explorer 8 or Higher in JavaScript and Run a Function Accordingly?. For more information, please follow other related articles on the PHP Chinese website!