jQuery browser detection?

Question

Is there a good way to detect if the user's browser is Internet Explorer using jQuery?

I have an issue with PNG graphics using IE and want to swap them for GIF's only if the user is viewing the site with IE.

Answer 1

You can using $.browser , yes, but it's a bad idea to use browser detection:

if($.browser.msie) { /* IE */ }

A better option for instance would be $.support which is feature detection, like this:

if(!$.support.opacity) { /* IE 6-8 */ }

$.support.opacity is false in browsers that don't support opacity in styling (though IE 7-8 handle transparent PNGs file, so this still isn't ideal, depending on what you're after...personally I think you'd be giving IE 7/8 users a sub-optimal experience).

What you should really do is target IE6 which doesn't support transparent PNGs (without an alpha filter), like this:

<!--[if IE 6]>
  <link rel="stylesheet" type="text/css" href="IE6ImageStyles.css">
<![endif]-->

Answer 2

Yes, you can, but they prefer you to use jQuery.support : http://api.jquery.com/jQuery.support/ .

In this case, use jQuery.support.opacity .

Edit: assuming this is about opacity, of course.

Answer 3

$ .browser已在1.9中删除，因为它现在建议通过$ .support首选功能检测

Answer 4

为了更好的浏览器检测，jQuery强烈建议使用诸如Modernizr之类的外部库，而不是依赖于jQuery.support中的属性或不推荐使用的jQuery.browser （从v1.9开始删除）

Answer 5

$.browser.webkit
$.browser.safari
$.browser.opera
$.browser.msie
$.browser.mozilla

if ($.browser.msie) {
        //do something
}
else if ($.browser.mozilla) {
        //do something else
}

works with jQuery 1.3

Answer 6

Check out the $.browser function.

To detect IE, you can also and better go for IE conditional comments .

Example:

<!--[if IE]>
  Special instructions for IE here
<![endif]-->

Answer 7

<script>
    jQuery.each(jQuery.browser, function(i, val) {
      $("<div>" + i + " : <span>" + val + "</span>")
                .appendTo(document.body);
    });</script>

$.browser.msie
for IE

Answer 8

I realise this isn't an answer - but I can't really post this in a comment!

If you're going to use javascript this code fixes the png issue with ie6. I haven't used it much, but afaik you need a transparent gif image called x.gif and it does the rest automatically.

// JavaScript Document

var supersleight    = function() {

    var root = false;
    var applyPositioning = true;

    // Path to a transparent GIF image
    var shim            = 'x.gif';

    // RegExp to match above GIF image name
    var shim_pattern    = /x\.gif$/i;



    var fnLoadPngs = function() { 
        if (root) {
            root = document.getElementById(root);
        }else{
            root = document;
        }
        for (var i = root.all.length - 1, obj = null; (obj = root.all[i]); i--) {
            // background pngs
            if (obj.currentStyle.backgroundImage.match(/\.png/i) !== null) {
                bg_fnFixPng(obj);
            }
            // image elements
            if (obj.tagName=='IMG' && obj.src.match(/\.png$/i) !== null){
                el_fnFixPng(obj);
            }
            // apply position to 'active' elements
            if (applyPositioning && (obj.tagName=='A' || obj.tagName=='INPUT') && obj.style.position === ''){
                obj.style.position = 'relative';
            }
        }
    };

    var bg_fnFixPng = function(obj) {
        var mode = 'scale';
        var bg  = obj.currentStyle.backgroundImage;
        var src = bg.substring(5,bg.length-2);
        if (obj.currentStyle.backgroundRepeat == 'no-repeat') {
            mode = 'crop';
        }
        obj.style.filter = "progid:DXImageTransform.Microsoft.AlphaImageLoader(src='" + src + "', sizingMethod='" + mode + "')";
        obj.style.backgroundImage = 'url('+shim+')';
    };

    var el_fnFixPng = function(img) {
        var src = img.src;
        img.style.width = img.width + "px";
        img.style.height = img.height + "px";
        img.style.filter = "progid:DXImageTransform.Microsoft.AlphaImageLoader(src='" + src + "', sizingMethod='scale')";
        img.src = shim;
    };

    var addLoadEvent = function(func) {
        var oldonload = window.onload;
        if (typeof window.onload != 'function') {
            window.onload = func;
        } else {
            window.onload = function() {
                if (oldonload) {
                    oldonload();
                }
                func();
            };
        }
    };

    return {
        init: function() { 
            addLoadEvent(fnLoadPngs);
        },

        limitTo: function(el) {
            root = el;
        },

        run: function() {
            fnLoadPngs();
        }
    };
}();

// limit to part of the page ... pass an ID to limitTo:
// supersleight.limitTo('header');

supersleight.init();