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Width and Height

 
阅读更多

Width and Height

offsetLeft offsetTop offsetWidth offsetHeight

offsetWidth offsetHeight

offsetWidth/offsetHeight = width/height + padding + border

 

offsetParent

offsetParent属性返回一个对象的引用，这个对象是距离调用offsetParent的元素最近的（在包含层次中最靠近的），并且是已进行过CSS定位的容器元素。 如果这个容器元素未进行CSS定位, 则offsetParent属性的取值为根元素的引用。

　　总的来说两条规则：

　　1、如果当前元素的父级元素没有进行CSS定位（position为absolute或relative），offsetParent为body。

　　2、如果当前元素的父级元素中有CSS定位（position为absolute或relative），offsetParent取最近的那个父级元素。

 

offsetLeft offsetTop

当body无margin、border、padding的场合、并且CSS中没有定位（offsetParent为body时）：

原则：元素的左（上）外边框至包含元素的左（上）内边框之间的像素距离(图1)。

IE6-7：(预测IE6-7默认当前元素的父级元素中有CSS定位,注意IE6不同的盒模型),值为相邻元素之间的距离。(图4、5)

IE8、Firefox、Chrome、Safari：元素距离浏览器边框的距离。(图2、3)

图1

 

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">  
<HTML>  
    <HEAD>  
        <TITLE> New Document </TITLE>  
        <META NAME="Generator" CONTENT="EditPlus">  
        <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />   
        <META NAME="Author" CONTENT="">  
        <META NAME="Keywords" CONTENT="">  
        <META NAME="Description" CONTENT="">  
        <style type="text/css">  
            * {  
                padding: 0;  
                margin: 0;  
            } 
            #BB{  
                margin:10px;  
                border:15px solid yellow;  
                padding:12px;  
                width:500px;height:400px;  
                background:red;  
                /*position: relative;*/
            }  
            #CC{  
                margin:30px;  
                border:40px solid black;  
                padding:10px;  
                width:500px;  
                height:250px;  
                background:blue;
                /*position: relative;*/
            }  
            #DD{  
                margin:20px;  
                border:30px solid #ccc;  
                padding:10px;  
                width:100px;  
                height:100px;  
                background:blue;  
                float: left;  
            }  
            #da{  
                margin:20px;  
                border:30px solid #555;  
                padding:10px;  
                width:100px;  
                height:100px;  
                background:blue;  
                float: left;  
            }  
        </style>  
    </HEAD>  
    <body>  
        <div id="BB">
			BB
			<div>
				<div id="CC">
					CC
					<div id="DD">
						DD
					</div>
					<div id="da">
						DA
					</div>
				</div>
			</div>
		</div>
		<span>
			<pre>	    #BB{margin:10px;border:15px solid yellow;padding:12px; position: relative;}  
            #CC{margin:30px;border:40px solid black; padding:10px;position: relative;}  
            #DD{margin:20px;border:30px solid #ccc;  padding:10px;width:100px;}  
            #da{margin:20px;border:30px solid #555;  padding:10px; } 
			</pre>
		</span>
    </body>  
    <script type="text/javascript">  
        function getElementLeft(element) {  
            var actualLeft = element.offsetLeft;  
            return actualLeft;  
        }  
  
        function getElementTop(element) {  
            var actualTop = element.offsetTop;  
            return actualTop;  
        } 
         
        /*
         * 
        function getElementLeft(element) {
			var actualLeft = element.offsetLeft;
			var current = element.offsetParent;
			while (current!==null) {
				actualLeft += current.offsetLeft;
				current = current.offsetParent;
			}
			return actualLeft;
		}

		function getElementTop(element) {
			var actualTop = element.offsetTop;
			var current = element.offsetParent;
			while (current!==null) {
				actualTop += current.offsetTop;
				current = current.offsetParent;
			}
			return actualTop;
		}
         */  
        var aa = document.body;  
        var bb = document.getElementById("BB");  
        var cc = document.getElementById("CC");  
        var dd = document.getElementById("DD");  
        var da = document.getElementById("da");  
          
        str = "bodyLeft:"+getElementLeft(aa);  
        str =str+"<br/>"+"bodyTop:"+getElementTop(aa);  
          
        str =str+"<br/>"+"redDivLeft:"+getElementLeft(bb);  
        str =str+"<br/>"+"redDivTop:"+getElementTop(bb);  
          
        str =str+ "<br/>"+"blueDivLeft:"+getElementLeft(cc);  
        str =str+"<br/>"+"blueDivTop:"+getElementTop(cc);  
          
        str =str+ "<br/>"+"innerDivLeft:"+getElementLeft(dd);  
        str =str+"<br/>"+"innerDivTop:"+getElementTop(dd);  
          
        str =str+ "<br/>"+"daDivLeft:"+getElementLeft(da);  
        str =str+"<br/>"+"daDivTop:"+getElementTop(da);  
          
        document.write(str);  
    </script>  
</HTML>
 

图2

图3

图4

图5

 

 

当body无margin、border、padding的场合、并且CSS中都有定位（offsetParent最近的那个父级元素时）：

原则：元素的左（上）外边框至包含元素的左（上）内边框之间的像素距离。

IE6-7、Firefox、Chrome、Safari：值为相邻元素之间的距离。并且与上图中的IE7的值基本相同（图6）。

IE8：元素的左（上）外边框至包含元素的左（上）外边框之间的像素距离（图7）。

IE6-7的值与上一种情况比较：未发生变化。

//为#BB、#CC添加代码position: relative;
#BB{  
                margin:10px;  
                border:15px solid yellow;  
                padding:12px;  
                width:500px;height:400px;  
                background:red;  
                position: relative;
            }  
            #CC{  
                margin:30px;  
                border:40px solid black;  
                padding:10px;  
                width:500px;  
                height:250px;  
                background:blue;
                position: relative;
            }

  图6

 

图7

总结：采用如下代码，基本（还要考虑上面所述的问题）可以获取某个元素在页面上的偏移量。

 

function getElementLeft(element) {
	var actualLeft = element.offsetLeft;
	var current = element.offsetParent;
	while (current!==null) {
		actualLeft += current.offsetLeft;
		current = current.offsetParent;
	}
	return actualLeft;
}

function getElementTop(element) {
	var actualTop = element.offsetTop;
	var current = element.offsetParent;
	while (current!==null) {
		actualTop += current.offsetTop;
		current = current.offsetParent;
	}
	return actualTop;
}

参考文章：http://www.cnblogs.com/jscode/archive/2012/09/03/2669299.html

 

obj.clientLeft、obj.clientTop、obj.clientWidth、obj.clientHeight（图8）

obj.scrollLeft、obj.scrollTop、obj.scrollWidth、obj.scrollHeight（图9）

window.sreenTop(sreenX)、window.screenLeft(sreenY)

window.screen.height、window.screen.width 屏幕分辨率的高度宽度

window.screen.availHeight、window.screen.availWidth 屏幕可用工作区的高度宽度

图8

图9

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
<HTML>
<HEAD>
<TITLE> New Document </TITLE>
<META NAME="Generator" CONTENT="EditPlus">
<META NAME="Author" CONTENT="">
<META NAME="Keywords" CONTENT="">
<META NAME="Description" CONTENT="">

</HEAD>

<body style="margin:20px;border:100px solid black;">
aaaaaaaaaaaaaaaaaaaaaaaaaaa
<div style="width:400px;height:400px;background:red">

bbbbb
<div>

<div id="sss" style="margin:10px;border:150px solid black;padding:100px;width:400px;height:400px;background:blue">

ccc
<div>
</body>

<script type="text/javascript">
 function test()
  {
  var s="";
   s+="\r\n body.clientLeft:"+document.body.clientLeft;
  s+="\r\n body.clientWidth:"+document.body.clientWidth;
  s+="\r\n body.clientHeight:"+document.body.clientHeight;
  s+="\r\n body.offsetLeft:"+document.body.offsetLeft; 
  s+="\r\n body.offsetTop:"+document.body.offsetTop;
  s+="\r\n body.offsetWidth:"+document.body.offsetWidth;
  s+="\r\n body.offsetHeight:"+document.body.offsetHeight;
  s+="\r\n body.scrollWidth:"+document.body.scrollWidth;
  s+="\r\n body.scrollHeight:"+document.body.scrollHeight;
  s+="\r\n body.scrollTop:"+document.body.scrollTop;
  s+="\r\n body.scrollLeft:"+document.body.scrollLeft;
  s+="\r\n window.screenTop:"+window.screenTop;
  s+="\r\n window.screenLeft:"+window.screenLeft;
  s+="\r\n window.screen.height:"+window.screen.height;
  s+="\r\n window.screen.width:"+window.screen.width;
  s+="\r\n window.screen.availHeight:"+window.screen.availHeight;
  s+="\r\n window.screen.availWidth:"+window.screen.availWidth;  
  s+="\r\n div:clientLeft"+document.getElementById("sss").clientLeft;
  s+="\r\n div:clientTop"+document.getElementById("sss").clientTop;
  s+="\r\n div:clientWidth"+document.getElementById("sss").clientWidth;
  s+="\r\n div:clientHeight"+document.getElementById("sss").clientHeight;

  s+="\r\n div:offsetLeft"+document.getElementById("sss").offsetLeft;
  s+="\r\n div:offsetTop"+document.getElementById("sss").offsetTop;
  s+="\r\n div:offsetWidth"+document.getElementById("sss").offsetWidth;
  s+="\r\n div:offsetHeight"+document.getElementById("sss").offsetHeight;


  alert(s);
  
  }
		test();

</script>
</HTML>

  运行结果：

 

从运行结果中得知：body中、clientWidth与scrollWidth比较：

IE相同、FF相差200（border）、Safari/Chrome相差240（border和margin）

以下内容引用自：http://www.sj63.com/html/201206/201206042342531057004461_1.html

 

 

obj.offset[Width|Height|Top|Left] 　取控件相对于父控的位置
event.offset[X|Y] 取鼠标相对触发事件的控件中的坐标
event.screen[X|Y] 鼠标相对于屏幕坐标
event.client[X|Y] 鼠标相对于网页坐标在在
obj.scroll[Width|Height|Top|Left]　获取对象滚动的大小
obj.client[Width|Height|Top|Left]　获取对象可见区域的大小

 

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
	<head>
		<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
		<title>无标题文档</title>
		<style type="text/css">
			div {
				font-family: "宋体";
				font-size: 12px;
				color: #000000;
			}
			* {
				padding: 0;
				margin: 0
			}
			#div1 {
				position: absolute;
				background-color: #f0f0f0;
				width: 200px;
				height: 200px;
				left: 20px;
				top: 0px;
				z-index: 1;
			}
			#div2 {
				background-color: #cfc0cf;
				width: 200px;
				height: 210px;
				position: absolute;
				left: 261px;
				top: 347px;
				z-index: 100;
			}
			#div3 {
				background-color: #abbfbf;
				width: 200px;
				height: 200px;
				position: absolute;
				left: 20px;
				top: 247px;
				z-index: 100;
			}
			#div4 {
				background-color: #cfcfcf;
				width: 200px;
				height: 200px;
				position: absolute;
				left: 461px;
				top: 147px;
				z-index: 100;
			}

		</style>

	</head>

	<body>
		<div id='div1' onclick='eventc(this)'>
			div1
		</div>
		<div id='div2' onclick='client(this);'>
			div2
		</div>
		<div id='div3' onclick='screen(this);'>
			div3
		</div>
		<div id='div4'onclick='offset(this);'>
			offset 控件相对于父窗体的位置
		</div>
		<script>
			function offset(ids) {
				ids.innerHTML = "offsetLeft =" + ids.offsetLeft + "<BR>";
				ids.innerHTML += "offsetWidth =" + ids.offsetWidth + "<BR>";
				ids.innerHTML += "offsetHeight =" + ids.offsetHeight + "<BR>";
				ids.innerHTML += "offsetTop =" + ids.offsetTop + "<BR>";
				ids.innerHTML += "event.offset 鼠标相对于控件的位置<BR>";
				ids.innerHTML += "offsetX =" + event.offsetX + "<BR>";
				ids.innerHTML += "offsetY =" + event.offsetY + "<BR>";
			}

			function screen(ids) {
				ids.innerHTML = "scrollWidth =" + ids.scrollWidth + "<BR>";
				ids.innerHTML += "scrollHeight =" + ids.scrollHeight + "<BR>";
				ids.innerHTML += "scrollTop =" + ids.scrollTop + "<BR>";
				ids.innerHTML += "scrollLeft =" + ids.scrollLeft + "<BR>";
			}

			function client(ids) {
				ids.innerHTML = "clientWidth =" + ids.clientWidth + "<BR>";
				ids.innerHTML += "clientHeight =" + ids.clientHeight + "<BR>";
				ids.innerHTML += "clientTop =" + ids.clientTop + "<BR>";
				ids.innerHTML += "clientLeft =" + ids.clientLeft + "<BR>";
			}

			function eventc(ids) {
				ids.innerHTML = "鼠标相对于屏幕坐标<BR>event.screenX=" + event.screenX + "<BR>";
				ids.innerHTML += "event.screenY =" + event.screenY + "<BR>";
				ids.innerHTML += "鼠标相对于网页坐标event.clientX=" + event.clientX + "<BR>";
				ids.innerHTML += "event.clientY =" + event.clientY + "<BR>";
			}

		</script>
	</body>
</html>

运行结果：  

 

以下内容以用自：http://www.funnyhao.com/pagex-clientx-offsetx-layerx-of-those-things/

pageX,clientX,offsetX,layerX的那些事

在各个浏览器的JS中,有很多个让你十分囧的属性,由于各大厂商对标准的解释和执行不一样,导致十分混乱,也让我们这些前端攻城狮十分无语和纠结>_<

John Resig大神说过,动态元素有3个至关重要的元素,位置,尺寸和可见性.所以,今天,先拿几个页面位置属性开刀.

 

一.PageX和clientX

PageX和clientX ,这个两个比较容易搞混,
PageX:鼠标在页面上的位置,从页面左上角开始,即是以页面为参考点,不随滑动条移动而变化
clientX:鼠标在页面上可视区域的位置,从浏览器可视区域左上角开始,即是以浏览器滑动条此刻的滑动到的位置为参考点,随滑动条移动 而变化.
真拗口,直接上图,


两个DIV接触点(黑点位置)
如果将浏览器Y轴方向缩小,出现了滑动条就可以分辨出两者的区别

很明显,红色参考块已经被滑动条截取部分,PageY不变,但是clientY已经变了

可是悲剧的是,PageX只有FF特有,IE这个悲剧没有啊T_T,所以大牛们想出了一个办法
PageY=clientY+scrollTop-clientTop;(只讨论Y轴,X轴同理,下同)
页面上的位置=可视区域位置+页面滚动条切去高度-自身border高度,还是直接上图比较清楚

很明显,模块交界处,scrollTop代表的是被浏览器滑动条滚过的长度,和clientY相加,刚好等于100,最后还要再减去一个clientTop,即是border-top的宽度

Jquery中的PageX的代码如下.十分精炼..

 

// Calculate pageX/Y if missing and clientX/Y available
if ( event.pageX == null && event.clientX !=  null ) {
	var doc = document.documentElement, body = document.body;
	event.pageX = event.clientX + (doc && doc.scrollLeft || body && body.scrollLeft || 0) - (doc && doc.clientLeft  || body && body.clientLeft || 0);
	event.pageY = event.clientY + (doc && doc.scrollTop  ||  body && body.scrollTop  || 0) - (doc && doc.clientTop  || body && body.clientTop  || 0);
}
 

二.screenX

screenX:鼠标在屏幕上的位置,从屏幕左上角开始,这个没有任何争议,不讨论 ^_^

三.offsetX和layerX

接下来是offsetX和layerX
offsetX:IE特有,鼠标相比较于触发事件的元素的位置,以元素盒子模型的内容区域的左上角为参考点,如果有boder,可能出现负值

IE以内容区域开始,向上进入border将出现负值

layerX:FF特有,鼠标相比较于当前坐标系的位置,即如果触发元素没有设置绝对定位或相对定位,以页面为参考点,如果有,将改变参考坐标系,从触发元素盒子模型的border区域的左上角为参考点
也就是当触发元素设置了相对或者绝对定位后,layerX和offsetX就幸福地生活在一起^-^,几乎相等,唯一不同就是一个从border为参考点,一个以内容为参考点

FF从border开始,

x/y:IE特有,这个本来和layerX/layerY的作用基本一样,但是IE的当前坐标选择十分混乱,能不用就不用,不讨论

网上别人总结的关于这六个纠结的纠结表..

1
2
3
4
5
6

offsetX/offsetY：W3C- IE+ Firefox- Opera+ Safari+ chrome+
x/y：W3C- IE+ Firefox- Opera+ Safari+ chrome+
layerX/layerY：W3C- IE- Firefox+ Opera- Safari+ chrome+
pageX/pageY：W3C- IE- Firefox+ Opera+ Safari+ chrome+
clientX/clientY：W3C+ IE+ Firefox+ Opera+ Safari+ chrome+
screenX/screenY：W3C+ IE+ Firefox+ Opera+ Safari+ chrome+

只有clientX和screenX 皆大欢喜是W3C标准.其他的,都纠结了.
最给力的是,chrome和safari一条龙通杀!完全支持所有属性.其中(offsetX和layerX都是以border为参考点)...

调式页面连接.

综合event的screenX、clientX、pageX、offsetX(layerX、x)的代码

 

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">  
<html xmlns="http://www.w3.org/1999/xhtml">  
    <head>  
        <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />  
        <title>无标题文档</title>  
        <style type="text/css">  
            div {  
                font-family: "宋体";  
                font-size: 12px;  
                color: #000000;  
            }  
            * {  
                padding: 0;  
                margin: 0  
            }  
            #div1 {  
                position: absolute;  
                background-color: #f0f0f0;  
                width: 200px;  
                height: 300px;  
                left: 20px;  
                top: 0px;  
                z-index: 1;  
            }  
            #div2 {  
                background-color: #cfc0cf;  
                width: 200px;  
                height: 210px;  
                position: absolute;  
                left: 261px;  
                top: 347px;  
                z-index: 100;  
            }  
            #div3 {  
                background-color: #abbfbf;  
                width: 200px;  
                height: 200px;  
                position: absolute;  
                left: 20px;  
                top: 347px;  
                z-index: 100;  
            }  
            #div4 {  
                background-color: #cfcfcf;  
                width: 200px;  
                height: 200px;  
                position: absolute;  
                left: 461px;  
                top: 147px;  
                z-index: 100;  
            }  
  
        </style>  
  
    </head>  
  
    <body>  
        <div id='div1' onclick='eventc(this,event)'>  
            div1  
        </div>  
        <div id='div2' onclick='client(this);'>  
            div2  
        </div>  
        <div id='div3' onclick='screen(this);'>  
            div3  
        </div>  
        <div id='div4'onclick='offset(this);'>  
            offset 控件相对于父窗体的位置  
        </div>  
        <script>  
            function offset(ids) {  
                ids.innerHTML = "offsetLeft =" + ids.offsetLeft + "<BR>";  
                ids.innerHTML += "offsetWidth =" + ids.offsetWidth + "<BR>";  
                ids.innerHTML += "offsetHeight =" + ids.offsetHeight + "<BR>";  
                ids.innerHTML += "offsetTop =" + ids.offsetTop + "<BR>";  
               
            }  
  
            function screen(ids) {  
                ids.innerHTML = "scrollWidth =" + ids.scrollWidth + "<BR>";  
                ids.innerHTML += "scrollHeight =" + ids.scrollHeight + "<BR>";  
                ids.innerHTML += "scrollTop =" + ids.scrollTop + "<BR>";  
                ids.innerHTML += "scrollLeft =" + ids.scrollLeft + "<BR>";  
            }  
  
            function client(ids) {  
                ids.innerHTML = "clientWidth =" + ids.clientWidth + "<BR>";  
                ids.innerHTML += "clientHeight =" + ids.clientHeight + "<BR>";  
                ids.innerHTML += "clientTop =" + ids.clientTop + "<BR>";  
                ids.innerHTML += "clientLeft =" + ids.clientLeft + "<BR>";  
            }  
  
            function eventc(ids,event) { 
            	event = event?event:window.event ;
               ids.innerHTML = "鼠标相对于屏幕坐标<BR>event.screenX=" + event.screenX + "<BR>";  
                ids.innerHTML += "event.screenY =" + event.screenY + "<BR>";  
                //从浏览器可视区域左上角开始,即是以浏览器滑动条此刻的滑动到的位置为参考点,随滑动条移动 而变化
                ids.innerHTML += "鼠标在页面上可视区域的位置,<br>"+
                				"event.clientX=" + event.clientX + "<BR>";  
                ids.innerHTML += "event.clientY =" + event.clientY + "<BR>"; 
                
                //IE 特有（比较FF而言）
                ids.innerHTML += "类比FF中的event.page鼠标在页面上的位置<BR>";  
                offsetXFF(ids,event);
                ids.innerHTML += "event.offset 鼠标相对于控件的位置<BR>";  
                ids.innerHTML += "offsetX =" + event.offsetX + "<BR>";  
                ids.innerHTML += "offsetY =" + event.offsetY + "<BR>";  
                ids.innerHTML += "event.x,y 鼠标相对于控件的位置（与offset不同点：参考点），不建议使用";  
                ids.innerHTML += "event.x =" + event.x + "<BR>";  
                ids.innerHTML += "event.y =" + event.y + "<BR>";  
                
                //FF 特有（比较IE而言）
                //从页面左上角开始,即是以页面为参考点,不随滑动条移动而变化
                ids.innerHTML += "event.page鼠标在页面上的位置<BR>";  
                ids.innerHTML += "event.pageX =" + event.pageX + "<BR>";  
                ids.innerHTML += "event.pageY =" + event.pageY + "<BR>"; 
                ids.innerHTML += "event.layerX 鼠标相对于控件的位置（IE中的offset）<BR>";  
                ids.innerHTML += "layerX =" + event.layerX + "<BR>";  
                ids.innerHTML += "layerY =" + event.layerY + "<BR>";  
            }  
  
  			function offsetXFF(ids,event){
  				event = event?event:window.event ;
  				if (event.pageX == null && event.clientX !=  null ) {  
				    var doc = document.documentElement, body = document.body;  
				    event.pageX = event.clientX + (doc && doc.scrollLeft || body && body.scrollLeft || 0) - (doc && doc.clientLeft  || body && body.clientLeft || 0);  
				    event.pageY = event.clientY + (doc && doc.scrollTop  ||  body && body.scrollTop  || 0) - (doc && doc.clientTop  || body && body.clientTop  || 0);
				    ids.innerHTML += "event.pageX =" + event.pageX + "<BR>";  
               		ids.innerHTML += "event.pageY =" + event.pageY + "<BR>";   
				}  
  			}
        </script>  
    </body>  
</html>
 

 

 

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