js获取隐藏元素宽高的实现方法_javascript技巧-JS Tutorial-php.cn

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js获取隐藏元素宽高的实现方法_javascript技巧

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May 23, 2016 pm 01:15 PM

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>

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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;
     }  
 
   }
}

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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

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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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