网上有一些js获取隐藏元素宽高的方法，但是可能会存在某些情况获取不了。
例如：
<!DOCTYPE html>
<html lang="en">
<head>
<meta http-equiv="Content-Type" content="text/html;charset=UTF-8" />
<title>test</title>
</head>
<body>
<div id="test" style="display:none">
我有一壶酒，足以慰风尘。尽倾江海里，赠饮天下人。
</div>
<div id="test2" style="display:none">
<div style="display:none">
<div id="test2_child">
我有一壶酒，足以慰风尘。尽倾江海里，赠饮天下人。
</div>
</div>
</div>
<div id="test3">
<div>
<div id="test3_child">
我有一壶酒，足以慰风尘。尽倾江海里，赠饮天下人。
</div>
</div>
</div>
</div>
</body>
</html>
test获取得了，但是test2_child是获取不到的。鉴于这种情况，于是自己写了一个方法解决。
解决思路：
1. 获取元素（拿宽高那个）所有隐藏的祖先元素直到body元素，包括自己。
2. 获取所有隐藏元素的style的display、visibility 属性，保存下来。
3. 设置所有隐藏元素为 visibility:hidden;display:block !important;（之所以要important是避免优先级不够）。
4. 获取元素（拿宽高那个）的宽高。
5. 恢复所有隐藏元素的style的display、visibility 属性。
6. 返回元素宽高值。
代码实现：
function getSize(id){
var width,
height,
elem = document.getElementById(id),
noneNodes = [],
nodeStyle = [];
getNoneNode(elem); //获取多层display：none;的元素
setNodeStyle();
width = elem.clientWidth;
height = elem.clientHeight;
resumeNodeStyle();
return {
width : width,
height : height
}
function getNoneNode(node){
var display = getStyles(node).getPropertyValue('display'),
tagName = node.nodeName.toLowerCase();
if(display != 'none'
&& tagName != 'body'){
getNoneNode(node.parentNode);
} else {
noneNodes.push(node);
if(tagName != 'body')
getNoneNode(node.parentNode);
}
}
//这方法才能获取最终是否有display属性设置，不能style.display。
function getStyles(elem) {
// Support: IE<=11+, Firefox<=30+ (#15098, #14150)
// IE throws on elements created in popups
// FF meanwhile throws on frame elements through "defaultView.getComputedStyle"
var view = elem.ownerDocument.defaultView;
if (!view || !view.opener) {
view = window;
}
return view.getComputedStyle(elem);
};
function setNodeStyle(){
var i = 0;
for(; i < noneNodes.length; i++){
var visibility = noneNodes[i].style.visibility,
display = noneNodes[i].style.display,
style = noneNodes[i].getAttribute("style");
//覆盖其他display样式
noneNodes[i].setAttribute("style", "visibility:hidden;display:block !important;" + style);
nodeStyle[i] = {
visibility :visibility,
display : display
}
}
}
function resumeNodeStyle(){
var i = 0;
for(; i < noneNodes.length; i++){
noneNodes[i].style.visibility = nodeStyle[i].visibility;
noneNodes[i].style.display = nodeStyle[i].display;
}
}
}
例子演示：
var testSize = getSize('test');
console.log("test-> width:" + testSize.width + " height:" + testSize.height);
var test2ChildSize2 = getSize('test2_child');
console.log("test2Child2-> width:" + test2ChildSize2.width + " height:" + test2ChildSize2.height);
var test3ChildSize = getSize('test3_child');
console.log("test3_child-> width:" + test3ChildSize.width + " height:" + test3ChildSize.height);
//打印值如下
test-> width:417 height:18
test2Child2-> width:417 height:18
test3_child-> width:417 height:18
注意事项：
1. 打开显示所有隐藏祖先元素，然后获取元素的宽高值，可能在某些情况下获取值是不正确的。
PS：不过这个不用担心，真正出错时再hack方法就行。
2. 之所以要保存隐藏祖先元素display、visibility 属性，是为了后面可以设置回来，不影响其本身。
3. 另外getStyles方法是从jquery源码中摘取出来，这方法才能获取最终是否有display属性设置。
PS：不能从style.display获取。
以上这篇js获取隐藏元素宽高的实现方法就是小编分享给大家的全部内容了，希望能给大家一个参考，也希望大家多多支持脚本之家。
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