通过JS抓取style.display属性仅在设置内联时有效吗? [英] Grabbing style.display property via JS only works when set inline?

问题描述

我正在尝试获取页面上div的DISPLAY属性.我似乎只能抓住它，如果它是通过内联样式属性设置的.

I'm trying to grab the DISPLAY property of a div on a page. I can only seem to grab it if it was set via an inline style attribute.

如果我的JS是这样的:

If my JS is this:

alert(document.getElementById('myDiv').style.display);

它将使用以下HTML警报阻止":

It will alert 'block' with this HTML:

<div id="myDiv" style="display: block;"></div>

但是，如果我通过外部样式表进行设置:

However, if I set it via an external style sheet:

#myID {display: block}

和我的HTML:

<div id="myDiv"></div>

然后我的警报是一个空字符串.

then my alert is an empty string.

这是为什么?

推荐答案

这是CSS的功能".要真正获得样式，您需要使用 window.getComputedStyle (大多数浏览器)或 element.currentStyle (Internet Explorer).

This is a "feature" of CSS. To actually get the style, you need to use window.getComputedStyle (most browsers) or element.currentStyle (Internet Explorer).

可以在以下位置找到实现 window.getComputedStyle IE的修复程序: http://www.quirksmode.org/dom/getstyles.html#link7 (底部附近有一个脚本，用于跨浏览器的getComputedStyle替代方法.)

A fix to implement window.getComputedStyle IE can be found at: http://snipplr.com/view/13523/getcomputedstyle-for-ie/. Additionally, see this page for more info: http://www.quirksmode.org/dom/getstyles.html#link7 (there is a script near the bottom for a cross-browser getComputedStyle alternative).

这应该在所有浏览器中都可以使用(基于上面QuirksMode链接的功能):

This should work in all browsers (based on function from QuirksMode link above):

var elem = document.getElementById("myDiv");
if (elem.currentStyle) {
    var displayStyle = elem.currentStyle.display;
} else if (window.getComputedStyle) {
    var displayStyle = window.getComputedStyle(elem, null).getPropertyValue("display");
}
alert(displayStyle);

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