JS实现的简易拖放效果示例
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2023-01-31 10:33:38
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：
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：
<!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">
<!--
var isie = (document.all) ? true : false;// 是否ie
var $ = function (id) {
//返回id对象
return "string" == typeof id ? document.getelementbyid(id) : id;
};
var class = {
// 带构造方法的类
create: function() {
return function() { this.initialize.apply(this, arguments); } //用apply应用下面的initialize初始化属性
}
}
var extend = function(destination, source) {
//继承
for (var property in source) {
destination[property] = source[property];
}
}
var bind = function(object, fun) {
return function() {
return fun.apply(object, arguments);
}
}
/**
用object对象调用fun参数是event||window event
**/
var bindaseventlistener = function(object, fun) {
return function(event) {
return fun.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
**/
function addeventhandler(otarget, seventtype, fnhandler) {
if (otarget.addeventlistener) {
otarget.addeventlistener(seventtype, fnhandler, false);//firefox
} else if (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
**/
function removeeventhandler(otarget, seventtype, fnhandler) {
if (otarget.removeeventlistener) {
otarget.removeeventlistener(seventtype, fnhandler, false);
} else if (otarget.detachevent) {
otarget.detachevent("on" + seventtype, fnhandler);
} else {
otarget["on" + seventtype] = null;
}
};
/*------------------------------相关模型构造完毕-----------------------------------*/
//拖放程序
var simpledrag = 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">
<!--
new simpledrag("iddrag");
// -->
</script>
</body>
</html>
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希望本文所述对大家javascript程序设计有所帮助。
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