Javascript拖动效果函数_js mousemove setcapture 演示-优快云博客

本文链接：https://blog.youkuaiyun.com/kovar/article/details/1706256

本文介绍了一种拖动效果函数的实现方式，该函数能够使HTML元素具备拖拽功能，并支持随窗口滚动调整位置。通过简单的JavaScript代码，实现了对元素位置的精确控制。

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<html>

<head><title>拖动效果函数演示 by Longbill.cn</title>

<style>

body

{

font-size:12px;

color:#333333;

border : 0px solid blue;

}

div

{

position : absolute;

background-color : #c3d9ff;

margin : 0px;

padding : 5px;

border : 0px;

width : 100px;

height:100px;

}

</style>

</head>

<body>

function drag(o,s)

{

if (typeof o == "string") o = document.getElementById(o);

o.orig_x = parseInt(o.style.left) - document.body.scrollLeft;

o.orig_y = parseInt(o.style.top) - document.body.scrollTop;

o.orig_index = o.style.zIndex;

o.onmousedown = function(a)

{

this.style.cursor = "move";

this.style.zIndex = 10000;

var d=document;

if(!a)a=window.event;

var x = a.clientX+d.body.scrollLeft-o.offsetLeft;

var y = a.clientY+d.body.scrollTop-o.offsetTop;

//author: www.longbill.cn

d.ondragstart = "return false;"

d.onselectstart = "return false;"

d.onselect = "document.selection.empty();"

if(o.setCapture)

o.setCapture();

else if(window.captureEvents)

window.captureEvents(Event.MOUSEMOVE|Event.MOUSEUP);

d.onmousemove = function(a)

{

if(!a)a=window.event;

o.style.left = a.clientX+document.body.scrollLeft-x;

o.style.top = a.clientY+document.body.scrollTop-y;

o.orig_x = parseInt(o.style.left) - document.body.scrollLeft;

o.orig_y = parseInt(o.style.top) - document.body.scrollTop;

}

d.onmouseup = function()

{

if(o.releaseCapture)

o.releaseCapture();

else if(window.captureEvents)

window.captureEvents(Event.MOUSEMOVE|Event.MOUSEUP);

d.onmousemove = null;

d.onmouseup = null;

d.ondragstart = null;

d.onselectstart = null;

d.onselect = null;

o.style.cursor = "normal";

o.style.zIndex = o.orig_index;

}

if (s)

{

var orig_scroll = window.onscroll?window.onscroll:function (){};

window.onscroll = function ()

{

orig_scroll();

o.style.left = o.orig_x + document.body.scrollLeft;

o.style.top = o.orig_y + document.body.scrollTop;

}

</script>

<div id="div1" style="left:10px;top:10px;">div1:我可以被拖动</div>

<div id="div3" style="left:230px;top:10px;background-color : #c3ffff">div3:我随便你拖</div>

<div id="div4" style="left:10px;top:120px;background-color : #c3d944">div4:我可以随窗口滑动，把我拖到最下面，然后滚动网页看看</div>

<div id="div5" style="left:120px;top:120px;background-color : #f3d944">div5

</div>

drag(obj [,scroll]);<br/>

obj:对象的id或对象本身;<br/>

scroll(可选):对象是否随窗口拖动而滑动，默认为否<br/>

鼠标右键查看源代码

</div>

drag("div1");

drag("div2");

drag("div3");

drag("div4",1);

drag("div5",1);

drag("div6",1);

</script>

</body>