使用在IE 8和7中不起作用的类获取标签

Question

My Script

var cwidth   = document.getElementById('contentarea').clientWidth;
var elements = document.getElementsByClassName("shadow");

for(var i=0; i<elements.length; i++) {
   elements[i].style.width = cwidth+"px";
   var anc = elements[i].getElementsByTagName("a"); // not working in IE 7 & 8
   anc[0].style.width = cwidth+"px";
}

This script working well in all browsers except IE 7 & 8

Any one please help me

Answer 1

getElementsByClassName isn't supported in IE<9.

In IE8 you can use:

var elements = document.querySelectorAll(".shadow");

But keep in mind that it's not a live collection like the one you get with getElementsByClassName . And if you want to look for elements with multiple classes, you'll have to do document.querySelectorAll(".first.second"); .

As for IE7, you have to rely on something else, like a weel known framework (like jQuery or just Sizzle), or a function like this:

var getElementsByClassName = (function(all) {
    return function (cls) {
        var a = [], i = 0;
        for (; i < all.length; i++)
            if ((" " + all[i].className + " ").indexOf(" " + cls + " ") !== -1)
                a.push(all[i]);
        return a;
    };
})(document.all);

This isn't a live collection either, moreover you won't be able to search for elements with multiple classes. That is, unless they are ordered like you want in their className property, but you can't rely on that. You'll have to do something more complicated, I'll leave it to you when you'll get more experienced in Javascript.

Answer 2

IE7和8没有功能'getElementsByClassName'，您可以像jQuery一样自行构建此功能。