编程 Javascript

JavaScript实现的多种鼠标拖放效果

Posted in Javascript onNovember 03, 2015

本文实例讲述了JavaScript实现的多种鼠标拖放效果。分享给大家供大家参考，具体如下：

这是一款JavaScript鼠标拖放效果代码，通过本示例了解触发对象，设置范围限制，指定容器大小水平及垂直锁定，还包括获取和释放焦点等。

运行效果截图如下：

在线演示地址如下：

具体代码如下：

<!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>拖放效果</title>
</head>
<body>
<script> 
var isIE = (document.all) ? true : false;
var $ = function (id) {
 return "string" == typeof id ? document.getElementById(id) : id;
};
var Class = {
 create: function() {
  return function() { this.initialize.apply(this, arguments); }
 }
}
var Extend = function(destination, source) {
 for (var property in source) {
  destination[property] = source[property];
 }
}
var Bind = function(object, fun) {
 return function() {
  return fun.apply(object, arguments);
 }
}
var BindAsEventListener = function(object, fun) {
 return function(event) {
  return fun.call(object, (event || window.event));
 }
}
var CurrentStyle = function(element){
 return element.currentStyle || document.defaultView.getComputedStyle(element, null);
}
function addEventHandler(oTarget, sEventType, fnHandler) {
 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) {
 if (oTarget.removeEventListener) {
 oTarget.removeEventListener(sEventType, fnHandler, false);
 } else if (oTarget.detachEvent) {
 oTarget.detachEvent("on" + sEventType, fnHandler);
 } else { 
 oTarget["on" + sEventType] = null;
 }
};
//拖放程序
var Drag = Class.create();
Drag.prototype = {
//拖放对象
 initialize: function(drag, options) {
 this.Drag = $(drag);//拖放对象
 this._x = this._y = 0;//记录鼠标相对拖放对象的位置
 this._marginLeft = this._marginTop = 0;//记录margin
 //事件对象(用于绑定移除事件)
 this._fM = BindAsEventListener(this, this.Move);
 this._fS = Bind(this, this.Stop);
 this.SetOptions(options);
 this.Limit = !!this.options.Limit;
 this.mxLeft = parseInt(this.options.mxLeft);
 this.mxRight = parseInt(this.options.mxRight);
 this.mxTop = parseInt(this.options.mxTop);
 this.mxBottom = parseInt(this.options.mxBottom);
 this.LockX = !!this.options.LockX;
 this.LockY = !!this.options.LockY;
 this.Lock = !!this.options.Lock;
 this.onStart = this.options.onStart;
 this.onMove = this.options.onMove;
 this.onStop = this.options.onStop;
 this._Handle = $(this.options.Handle) || this.Drag;
 this._mxContainer = $(this.options.mxContainer) || null;
 this.Drag.style.position = "absolute";
 //透明
 if(isIE && !!this.options.Transparent){
  //填充拖放对象
  with(this._Handle.appendChild(document.createElement("div")).style){
   width = height = "100%"; backgroundColor = "#fff"; filter = "alpha(opacity:0)";
  }
 }
 //修正范围
 this.Repair();
 addEventHandler(this._Handle, "mousedown", BindAsEventListener(this, this.Start));
 },
 //设置默认属性
 SetOptions: function(options) {
 this.options = {//默认值
  Handle:   "",//设置触发对象（不设置则使用拖放对象）
  Limit:   false,//是否设置范围限制(为true时下面参数有用,可以是负数)
  mxLeft:   0,//左边限制
  mxRight:  9999,//右边限制
  mxTop:   0,//上边限制
  mxBottom:  9999,//下边限制
  mxContainer: "",//指定限制在容器内
  LockX:   false,//是否锁定水平方向拖放
  LockY:   false,//是否锁定垂直方向拖放
  Lock:   false,//是否锁定
  Transparent: false,//是否透明
  onStart:  function(){},//开始移动时执行
  onMove:   function(){},//移动时执行
  onStop:   function(){}//结束移动时执行
 };
 Extend(this.options, options || {});
 },
 //准备拖动
 Start: function(oEvent) {
 if(this.Lock){ return; }
 this.Repair();
 //记录鼠标相对拖放对象的位置
 this._x = oEvent.clientX - this.Drag.offsetLeft;
 this._y = oEvent.clientY - this.Drag.offsetTop;
 //记录margin
 this._marginLeft = parseInt(CurrentStyle(this.Drag).marginLeft) || 0;
 this._marginTop = parseInt(CurrentStyle(this.Drag).marginTop) || 0;
 //mousemove时移动 mouseup时停止
 addEventHandler(document, "mousemove", this._fM);
 addEventHandler(document, "mouseup", this._fS);
 if(isIE){
  //焦点丢失
  addEventHandler(this._Handle, "losecapture", this._fS);
  //设置鼠标捕获
  this._Handle.setCapture();
 }else{
  //焦点丢失
  addEventHandler(window, "blur", this._fS);
  //阻止默认动作
  oEvent.preventDefault();
 };
 //附加程序
 this.onStart();
 },
 //修正范围
 Repair: function() {
 if(this.Limit){
  //修正错误范围参数
  this.mxRight = Math.max(this.mxRight, this.mxLeft + this.Drag.offsetWidth);
  this.mxBottom = Math.max(this.mxBottom, this.mxTop + this.Drag.offsetHeight);
  //如果有容器必须设置position为relative来相对定位，并在获取offset之前设置
  !this._mxContainer || CurrentStyle(this._mxContainer).position == "relative" || (this._mxContainer.style.position = "relative");
 }
 },
 //拖动
 Move: function(oEvent) {
 //判断是否锁定
 if(this.Lock){ this.Stop(); return; };
 //清除选择
 window.getSelection ? window.getSelection().removeAllRanges() : document.selection.empty();
 //设置移动参数
 var iLeft = oEvent.clientX - this._x, iTop = oEvent.clientY - this._y;
 //设置范围限制
 if(this.Limit){
  //设置范围参数
  var mxLeft = this.mxLeft, mxRight = this.mxRight, mxTop = this.mxTop, mxBottom = this.mxBottom;
  //如果设置了容器，再修正范围参数
  if(!!this._mxContainer){
   mxLeft = Math.max(mxLeft, 0);
   mxTop = Math.max(mxTop, 0);
   mxRight = Math.min(mxRight, this._mxContainer.clientWidth);
   mxBottom = Math.min(mxBottom, this._mxContainer.clientHeight);
  };
  //修正移动参数
  iLeft = Math.max(Math.min(iLeft, mxRight - this.Drag.offsetWidth), mxLeft);
  iTop = Math.max(Math.min(iTop, mxBottom - this.Drag.offsetHeight), mxTop);
 }
 //设置位置，并修正margin
 if(!this.LockX){ this.Drag.style.left = iLeft - this._marginLeft + "px"; }
 if(!this.LockY){ this.Drag.style.top = iTop - this._marginTop + "px"; }
 //附加程序
 this.onMove();
 },
 //停止拖动
 Stop: function() {
 //移除事件
 removeEventHandler(document, "mousemove", this._fM);
 removeEventHandler(document, "mouseup", this._fS);
 if(isIE){
  removeEventHandler(this._Handle, "losecapture", this._fS);
  this._Handle.releaseCapture();
 }else{
  removeEventHandler(window, "blur", this._fS);
 };
 //附加程序
 this.onStop();
 }
};
</script>
<style> 
#idContainer{ border:10px solid #990000; width:600px; height:300px;}
#idDrag{ border:5px solid #C4E3FD; background:#C4E3FD; width:50px; height:50px; top:50px; left:50px;}
#idHandle{cursor:move; height:25px; background:#0000FF; overflow:hidden;}
</style>
<div id="idContainer">
<div id="idDrag"><div id="idHandle"></div></div>
</div>
<input id="idReset" type="button" value="复位" />
<input id="idLock" type="button" value="锁定" />
<input id="idLockX" type="button" value="锁定水平" />
<input id="idLockY" type="button" value="锁定垂直" />
<input id="idLimit" type="button" value="范围锁定" />
<input id="idLimitOff" type="button" value="取消范围锁定" />
<br />拖放状态：<span id="idShow">未开始</span>
<script> 
var drag = new Drag("idDrag", { mxContainer: "idContainer", Handle: "idHandle", Limit: true,
 onStart: function(){ $("idShow").innerHTML = "开始拖放"; },
 onMove: function(){ $("idShow").innerHTML = "left："+this.Drag.offsetLeft+"；top:"+this.Drag.offsetTop; },
 onStop: function(){ $("idShow").innerHTML = "结束拖放"; }
});
$("idReset").onclick = function(){
 drag.Limit = true;
 drag.mxLeft = drag.mxTop = 0;
 drag.mxRight = drag.mxBottom = 9999;
 drag.LockX = drag.LockY = drag.Lock = false;
}
$("idLock").onclick = function(){ drag.Lock = true; }
$("idLockX").onclick = function(){ drag.LockX = true; }
$("idLockY").onclick = function(){ drag.LockY = true; }
$("idLimit").onclick = function(){  drag.mxRight = drag.mxBottom = 200;drag.Limit = true; }
$("idLimitOff").onclick = function(){ drag.Limit = false; }
</script>
</body>
</html>

希望本文所述对大家JavaScript程序设计有所帮助。

JavaScript实现的多种鼠标拖放效果

- Author -

企鹅

声明：登载此文出于传递更多信息之目的，并不意味着赞同其观点或证实其描述。

Javascript 相关文章推荐

JQuery 将元素显示在屏幕的中央的代码

Feb 27 Javascript

jquery刷新页面的实现代码（局部及全页面刷新）

Jul 11 Javascript

解析页面加载与js函数的执行 onload or ready

Dec 12 Javascript

IE下Ajax缓存问题的快速解决方法(get方式)

Jan 09 Javascript

预防网页挂马的方法总结

Nov 03 Javascript

多个上传文件用js验证文件的格式和大小的方法(推荐)

Mar 09 Javascript

Angular 4依赖注入学习教程之ValueProvider的使用（七）

Jun 04 Javascript

使用JavaScript进行表单校验功能

Aug 01 Javascript

JS实现的全选、全不选及反选功能【案例】

Feb 19 Javascript

这应该是最详细的响应式系统讲解了

Jul 22 Javascript

基于Vue 撸一个指令实现拖拽功能

Oct 09 Javascript

Vue通过getAction的finally来最大程度避免影响主数据呈现问题

Apr 24 Javascript

JavaScript实现的Tween算法及缓冲特效实例代码

Nov 03 #Javascript

jQuery实现Email邮箱地址自动补全功能代码

Nov 03 #Javascript

jQuery实现仿QQ头像闪烁效果的文字闪动提示代码

Nov 03 #Javascript

基于JavaScript怎么实现让歌词滚动播放

Nov 03 #Javascript

ECMA5数组的新增方法有哪些及forEach（）模仿实现

Nov 03 #Javascript

Javascript设计模式理论与编程实战之简单工厂模式

Nov 03 #Javascript

JS实现网页标题随机显示名人名言的方法

Nov 03 #Javascript