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Pelbagai kesan drag-and-drop tetikus dilaksanakan oleh JavaScript

PHPz
PHPzke hadapan
2016-05-16 15:33:491119semak imbas

Artikel ini terutamanya memperkenalkan pelbagai kesan seret dan lepas tetikus yang dilaksanakan oleh JavaScript, dan melibatkan teknik berkaitan untuk JavaScript mengubah atribut elemen halaman secara dinamik sebagai tindak balas kepada peristiwa tetikus Ia mempunyai nilai rujukan tertentu yang boleh dirujuk oleh Rakan yang memerlukannya ia. Butirannya adalah seperti berikut:

Ini ialah kod kesan seret dan lepas tetikus JavaScript Melalui contoh ini, anda boleh belajar tentang objek pencetus, tetapkan had julat, nyatakan saiz bekas, kuncinya secara mendatar. dan menegak, dan juga termasuk memperoleh dan melepaskan fokus, dsb.

Tangkapan skrin kesan berjalan adalah seperti berikut:

Alamat demo dalam talian adalah seperti berikut:

http: //demo.jb51.net/ js/2015/js-mouse-move-fix-style-codes/

Kod khusus adalah seperti berikut: 

<!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("p")).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>
<p id="idContainer">
<p id="idDrag"><p id="idHandle"></p></p>
</p>
<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>

Kod di atas ialah keseluruhan kandungan bab ini Untuk lebih banyak tutorial berkaitan, sila Lawati Tutorial Video JavaScript!

Kenyataan：
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