JS如何实现简易拖放效果的教程
发布时间：01/15 来源： 浏览：
关键词：
这篇文章介绍了js中如何实现简易拖放效果的教程，非常实用，有兴趣的同学可以亲自动手尝试一下
本文实例讲述了JS实现的简易拖放效果。分享给大家供大家参考，具体如下：
| 代码如下 | |
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<!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=gb2312"/>
<title>简易拖放效果</title>
</head>
<body>
<script type="text/JavaScript">
<!--
varisIE = (document.all) ?true:false;// 是否ie
var$ =function(id) {
//返回id对象
return"string"==typeofid ? document.getElementById(id) : id;
};
varClass = {
// 带构造方法的类
create:function() {
returnfunction() {this.initialize.apply(this, arguments); }//用apply应用下面的initialize初始化属性
}
}
varExtend =function(destination, source) {
//继承
for(varpropertyinsource) {
destination[property] = source[property];
}
}
varBind =function(object, fun) {
returnfunction() {
returnfun.apply(object, arguments);
}
}
/**
用object对象调用fun参数是event||window event
**/
varBindAsEventListener =function(object, fun) {
returnfunction(event) {
returnfun.call(object, (event || window.event));
}
}
/**
添加帧听器事件
@oTarget 目标对象
@sEventType 事件类型
@fnHandler 目标触发事件对象
**/
functionaddEventHandler(oTarget, sEventType, fnHandler) {
if(oTarget.addEventListener) {
oTarget.addEventListener(sEventType, fnHandler,false);//firefox
}elseif(oTarget.attachEvent) {
oTarget.attachEvent("on"+ sEventType, fnHandler);//ie
}else{
oTarget["on"+ sEventType] = fnHandler;//other
}
};
/**
清除添加的帧听器事件
@oTarget 目标对象
@sEventType 事件类型
@fnHandler 目标触发事件对象
**/
functionremoveEventHandler(oTarget, sEventType, fnHandler) {
if(oTarget.removeEventListener) {
oTarget.removeEventListener(sEventType, fnHandler,false);
}elseif(oTarget.detachEvent) {
oTarget.detachEvent("on"+ sEventType, fnHandler);
}else{
oTarget["on"+ sEventType] =null;
}
};
/*------------------------------相关模型构造完毕-----------------------------------*/
//拖放程序
varSimpleDrag = Class.create();
SimpleDrag.prototype = {
//拖放对象,触发对象,初始化
initialize:function(drag) {
this.Drag = $(drag);
this._x =this._y = 0;
this._fM = BindAsEventListener(this,this.Move);//_fM方法就是应用MOVE方法参数是event||window.event
this._fS = Bind(this,this.Stop);//_fS类方法就是Stop方法
this.Drag.style.position ="absolute";
this.Drag.style.cursor ="move";
addEventHandler(this.Drag,"mousedown", BindAsEventListener(this,this.Start));
},
//准备拖动
Start:function(oEvent) {
this._x = oEvent.clientX -this.Drag.offsetLeft;
this._y = oEvent.clientY -this.Drag.offsetTop;
addEventHandler(document,"mousemove",this._fM);
addEventHandler(document,"mouseup",this._fS);
},
//拖动
Move:function(oEvent) {
this.Drag.style.left = oEvent.clientX -this._x +"px";
this.Drag.style.top = oEvent.clientY -this._y +"px";
},
//停止拖动
Stop:function() {
removeEventHandler(document,"mousemove",this._fM);
removeEventHandler(document,"mouseup",this._fS);
}
};
// -->
</script>
<div id="idDrag"style="border:5px solid #0000FF; background:#C4E3FD; width:50px; height:50px;"></div>
<script type="text/javascript">
<!--
newSimpleDrag("idDrag");
// -->
</script>
</body>
</html>
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