在IE中将计算出的背景颜色作为rgb [英] get computed background color as rgb in IE

问题描述

我想使用以下代码在IE中获取RGB背景颜色：

I am trying to get the RGB background color in IE using the following code:

function getStyle(elem, name) {
    // J/S Pro Techniques p136
    if (elem.style[name]) {
        return elem.style[name];
    } else if (elem.currentStyle) {
        return elem.currentStyle[name];
    }
    else if (document.defaultView && document.defaultView.getComputedStyle) {
        name = name.replace(/([A-Z])/g, "-$1");
        name = name.toLowerCase();
        s = document.defaultView.getComputedStyle(elem, "");
        return s && s.getPropertyValue(name);
    } else {
        return null;
    }
}

var $b = $("<button>");
$b.css("backgroundColor", "ButtonFace");
$("body").append($b);
alert("button bg color is: "+ getStyle($b[0],"backgroundColor"));
//alerts 'buttonface'

这不会像firefox一样返回rgb颜色值，它返回'buttonface'，这对我没用。

this does not return an rgb color value like firefox does, it returns 'buttonface' which is useless to me.

推荐答案

我一直致力于跨浏览器实现 getStyle函数，
我的函数尚未完成，但我可以帮助您解决IE中的这个特定问题。

I have been working on a cross-browser implementation of a "getStyle" function, my function isn't complete yet but I can help you to solve this specific problem you have with IE.

对于计算出的 backgroundColor ，我正在使用这个页面，它使用IE特定的 queryCommandValue 获取 BackColor 。

For the computed backgroundColor, I'm using a hack proposed in this page, it uses the IE specific queryCommandValue method to get the BackColor of a selection.

关于你发布的实现，我建议检查一下rst如果标准的 getComputedStyle 方法存在 document.defaultView ，因为某些浏览器如Opera，提供IE特定的 currentStyle 兼容性对象。

About the implementation you post, I would recommend to check first if the standard getComputedStyle method via the document.defaultView exists, because some browsers like Opera, provide the IE specific currentStyle object for compatibility.

所以我重构了你的函数并包含了 IE hack ：

So I've refactored your function and included the IE hack:

function getStyle(elem, name) {
  if (document.defaultView && document.defaultView.getComputedStyle) {
    name = name.replace(/([A-Z])/g, "-$1");
    name = name.toLowerCase();
    s = document.defaultView.getComputedStyle(elem, "");
    return s && s.getPropertyValue(name);
  } else if (elem.currentStyle) {
    if (/backgroundcolor/i.test(name)) {
      return (function (el) { // get a rgb based color on IE
        var oRG=document.body.createTextRange();
        oRG.moveToElementText(el);
        var iClr=oRG.queryCommandValue("BackColor");
          return "rgb("+(iClr & 0xFF)+","+((iClr & 0xFF00)>>8)+","+
                      ((iClr & 0xFF0000)>>16)+")";
      })(elem);
    }

    return elem.currentStyle[name];
  } else if (elem.style[name]) {
    return elem.style[name];
  } else  {
    return null;
  }
}

希望很快我会发布一个更通用的实现，但这足以解决你的 backgorundColor 问题。

Hopefully soon I'll post a more generic implementation, but this will be enough to solve your backgorundColor issue.

你可以测试上面的函数这里。

You can test the above function here.

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