使用javascript,当我点击它时,如何获得表格单元格的背景颜色? [英] Using javascript, how do I get the background color of a table cell when I click on it?
问题描述
我想要弹出一个警报,只要点击它就可以显示表格单元格的背景。我似乎无法找到或弄清楚如何获取背景颜色。
我的表格单元格如下所示:
< td id =s0onclick =selectCell(event)> 0< / td>
我的selectCell函数如下所示:
函数selectCell(e){
alert(e.target.backgroundColor); //这给了我'未定义'
alert(e.target.bgcolor); //这给了我'未定义'
alert(e.target.bgColor); //没有任何显示。我不相信这是一个有效的财产
//一旦我知道我正确地抓住了颜色,我会在这里做它的东西。
}
我的CSS看起来像这样:
#s0 {
border:1px solid;
background-color:yellow;
}
任何帮助将不胜感激!
节点的样式位于styles属性中,例如:
e.target.style.backgroundColor;
然而,这只适用于使用内联样式
属性。如果使用样式表分配CSS(应该是),则需要使用:
window.getComputedStyle(e .target,null).backgroundColor;
不幸的是,Internet Explorer并未实现 getComputedStyle() code>选项,而不是提供
currentStyle
(注意,它们不支持 e.target
认为,至少在8之前的版本?)。我没有用于测试的Internet Explorer,但文档建议它应该被使用:
var e = window.event? window.event:e,
elementNode = e.target!== null? e.target:e.srcElement;
elementNode.currentStyle.backgroundColor;
参考文献:
I want to have an alert pop up that shows me the background of a table cell whenever i click on it. I just can't seem to find or figure out how to grab the background color.
My table cell looks like this:
<td id="s0" onclick="selectCell(event)">0</td>
My selectCell function looks like this:
function selectCell(e){
alert(e.target.backgroundColor); //this gives me 'undefined'
alert(e.target.bgcolor); //this gives me 'undefined'
alert(e.target.bgColor); //nothing shows up. i don't believe this is a valid property
//once i know i am properly grabbing the color i will do stuff with it here.
}
My CSS looks like this:
#s0 {
border: 1px solid;
background-color: yellow;
}
Any help would be greatly appreciated!!
The styles of a node are in the styles property, for example:
e.target.style.backgroundColor;
However this works only for those styles declared with the in-line style
attribute. If CSS is assigned (as it should be) using a stylesheet, you'll need to use:
window.getComputedStyle(e.target, null).backgroundColor;
Internet Explorer, unfortunately, doesn't implement the getComputedStyle()
option, instead offering currentStyle
(mind, they don't support e.target
either, I think, at least in versions prior to 8?). I don't have Internet Explorer with which to test, but the docs suggest that it should be used:
var e = window.event ? window.event : e,
elementNode = e.target !== null ? e.target : e.srcElement;
elementNode.currentStyle.backgroundColor;
References:
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