haslayout

定义

  haslayout是IE7-浏览器的特有属性。hasLayout是一种只读属性,有两种状态:true或false。当其为true时,代表该元素有自己的布局,否则代表该元素的布局继承于父元素。   [注意]通过element.currentStyle.hasLayout可以得出当前元素的hasLayout情况

 

HTML标签

  默认触发hasLayout的有如下HTML标签:

【1】html,body

【2】table,tr,th,td

【3】img

【4】hr

【5】input,button,select,textarea,fieldset

【6】frameset,frame,iframe

 

CSS属性

  可以触发hasLayout的有如下CSS属性:

  【1】display:inline-block

  【2】height/width:除了auto

  【3】float:left/right

  【4】position:absolute

  【5】writing-mode(IE专有属性,设置文本的垂直显示):tb-rl

  【6】zoom(IE专有属性,设置或检索对象的缩放比例):除了normal

 

【IE7专有的触发hasLayout的CSS属性】

  【1】min-height/max-height/min-width/max-width:除none

  【2】overflow\overflow-x\overflow-y:除visible

  【3】position:fixed

  

用途

【1】解决IE7-浏览器下父级边框不阻止子级上下margin传递的bug

<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Document</title>
<style>
body{
    margin: 0;
}
ul{
    margin: 0;
    padding: 0;
    list-style: none;
}
.list{
    border: 10px solid black;
    background-color: red;
    /*触发hasLayout*/
    /*float:left;*/
}
.in{
    height: 100px;
    width: 100px;
    margin-top: 50px;
    background-color: blue;
}
</style>
</head>
<body>
<ul class="list">
    <li class="in"></li>
</ul>
</body>    
</html>    

 

  【2】配合display:inline让块元素模拟inline-block

<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Document</title>
<style>
body{
    margin: 0;
}
.box{
    width: 100px;
    height: 100px;
    background-color: red;
    display:inline-block;
    /*配合display:inline触发hasLayout*/
    /*     float:left;
    display:inline; */
}
</style>
</head>
<body>
<div class="box" id="box"></div><span>测试inline-block用</span>
</body>    
</html>            

 

  【3】解决在IE7-浏览器下LI4px空隙bug(IE7-浏览器下li有高度或宽度或zoom:1,且仅包含内联元素,且内联元素被设置为display:block,li下会多出3px的垂直间距)

<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Document</title>
<style>
body{
    margin: 0;
}
ul{
    margin: 0;
    padding: 0;
    list-style: none;
}
.list{
    width: 200px;
    background-color: lightgreen;
}
.in{
    height: 100px;
    background-color: lightblue;
}
.span{
    display: block;
    zoom:1;
}
</style>
</head>
<body>
<ul class="list">
    <li class="in">
        <span class="span">1231</span>
    </li>
    <li class="in">
        <span class="span">1232</span>
    </li>
</ul>
</body>    
</html>        

 

  【4】触发浮动元素的父级的hasLayout,浮动元素会被layout元素自动包含,相当于IE7-浏览器下实现清浮动

<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Document</title>
<style>
body{
    margin: 0;
}
ul{
    margin: 0;
    padding: 0;
    list-style: none;
}
.list{
    background-color: lightgreen;
    height: 200px;
}

.in{
    float: left;
    width: 100px;
    height: 100px;
    border: 1px solid black;
    background-color: lightblue;
}
.test{
    width: 100px;
    height: 150px;
    background-color: yellow;
}
</style>
</head>
<body>
<ul class="list">
    <li class="in"></li>
    <li class="in"></li>
</ul>
<div class="test">测试浮动</div>
</body>    
</html>            

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