JavaScript实现网页对象拖放功能的方法

前端技术 2023/09/09 JavaScript

本文实例讲述了JavaScript实现网页对象拖放功能的方法。分享给大家供大家参考。具体如下：

<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.01 Transitional//EN\" 
\"http://www.w3.org/TR/html4/loose.dtd\">
<html>
<head>
<title>Drag</title>
<meta http-equiv=\"Content-Type\" content=\"text/html;charset=utf-8\">
<style>
#myDiv{width:50px; height:50px; background-color:red}
</style>
</head>
<body>
<div id=\"myDiv\"></div>
</body>
<script type=\"text/javascript\">
 var isIE = document.all ? true : false;
 //判断是否是IE浏览器
 function addEventHandler(oTarget, sEventType, fnHandler){
 //添加事件
 if(oTarget.addEventListener){
 oTarget.addEventListener(sEventType, fnHandler, false);
 }else if(oTarget.attachEvent){
 oTarget.attachEvent(\"on\" + sEventType, fnHandler);
 }else{
 oTarget[\"on\" + sEventType] = fnHandler;
 }
 }
 function removeEventHandler(oTarget, sEventType, fnHandler) {
 //移除事件
 if (oTarget.removeEventListener) {
 oTarget.removeEventListener(sEventType, fnHandler, false);
 } else if (oTarget.detachEvent) {
 oTarget.detachEvent(\"on\" + sEventType, fnHandler);
 } else {
 oTarget[\"on\" + sEventType] = null;
 }
 }
 var BindAsEventListener = function(object, fun) {
 //以另一个对象替换当前对象
 return function(event) {
 return fun.call(object, (event || window.event));
 }
 }
 var $ = function(id){
 return document.getElementById(id);
 }
 var Class = {
 create: function() {
 return function() {this.initialize.apply(this, arguments);}
 }
 }
 var drag = Class.create();
 drag.prototype = {
 initialize: function(id){//初始化
 this._drag = $(id);
 this._flag = false;
 addEventHandler(this._drag,\'mousedown\',BindAsEventListener(this,this.start));
 this._fM = BindAsEventListener(this, this.move);
 this._fS = BindAsEventListener(this, this.stop);
 this._drag.style.position = \"absolute\";
 },
 start: function(oEvent){//相当于onmousedown事件
 //return this._name;
 this._x = oEvent.clientX - this._drag.offsetLeft;
 this._y = oEvent.clientY - this._drag.offsetTop;
 addEventHandler(document, \'mousemove\', this._fM);
 addEventHandler(document, \'mouseup\', this._fS);
 if(isIE){
  addEventHandler(this._drag, \"losecapture\", this._fS);
 //焦点丢失
  this._Handle.setCapture();//设置鼠标捕获
 }else{
  addEventHandler(window, \"blur\", this._fS);//焦点丢失
  oEvent.preventDefault();//阻止默认动作
 }
 },
 move: function(oEvent){ //相当于onmonusemove事件
 this._drag.style.left = oEvent.clientX - this._x + \"px\";
 this._drag.style.top = oEvent.clientY - this._y + \"px\";
 },
 stop: function(){ //相当于onmouseup事件
 removeEventHandler(document, \'mousemove\', this._fM);
 removeEventHandler(document, \'mouseup\', this._fS);
 if(isIE){
  removeEventHandler(this._drag, \"losecapture\", this._fS);
  this._Handle.releaseCapture();
 }else{
  removeEventHandler(window, \"blur\", this._fS);
 }
 }
 }
 var ndrag = new drag(\"myDiv\");
</script>
</html>

希望本文所述对大家的javascript程序设计有所帮助。

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