ドラッグ アンド ドロップ効果。ドラッグ アンド ドロップとも呼ばれます。シンプルなドラッグアンドドロップ効果
div をドラッグ
[プログラムの説明]
まず関数を初期化し、ドラッグアンドドロップオブジェクトにマウスダウンリスニングイベントを追加します
initialize:function(drag){ this.Drag = $$(drag);//拖放对象 this._x = this._y = 0;//记录鼠标相对于拖放对象的位置 this._fM = BindAsEventListener(this, this.Move); //绑定拖动时执行的函数 this._fS = Bind(this, this.Stop); //绑定拖动结束执行的函数 this.Drag.style.position = "absolute"; EventUtil.addEventHandler(this.Drag, "mousedown", BindAsEventListener(this, this.Start)); //监听拖动对象mousedown事件 }
次に、mousemoveイベントとmouseupイベントを追加しますStart メソッド、ドラッグ アンド ドロップ オブジェクトの位置を監視し、リスニング イベントをそれぞれキャンセルします
Start:function(oEvent){ //记录mousedown触发时鼠标相对于拖放对象的位置 this._x = oEvent.clientX - this.Drag.offsetLeft; this._y = oEvent.clientY - this.Drag.offsetTop; //监听mousemove 和 mouseup事件 EventUtil.addEventHandler(document, "mousemove", this._fM); EventUtil.addEventHandler(document, "mouseup", this._fS); }
完全なドラッグ アンド ドロップ プログラム:
/** *拖放程序 */ var simpleDrag = Class.create(); simpleDrag.prototype = { //初始化对象 initialize:function(drag){ this.Drag = $$(drag);//拖放对象 this._x = this._y = 0;//记录鼠标相对于拖放对象的位置 this._fM = BindAsEventListener(this, this.Move); //绑定拖动时执行的函数 this._fS = Bind(this, this.Stop); //绑定拖动结束执行的函数 this.Drag.style.position = "absolute"; EventUtil.addEventHandler(this.Drag, "mousedown", BindAsEventListener(this, this.Start)); //监听拖动对象mousedown事件 }, //准备拖动 Start:function(oEvent){ //记录mousedown触发时鼠标相对于拖放对象的位置 this._x = oEvent.clientX - this.Drag.offsetLeft; this._y = oEvent.clientY - this.Drag.offsetTop; //监听mousemove 和 mouseup事件 EventUtil.addEventHandler(document, "mousemove", this._fM); EventUtil.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(){ EventUtil.removeEventHandler(document, "mousemove", this._fM); EventUtil.removeEventHandler(document, "mouseup", this._fS); }, }; //初始化拖动 new simpleDrag('drag');
完全なデモ:
<!DOCTYPE html><html lang="en"><head> <meta charset="UTF-8"> <title>JavaScript拖放效果</title> <style type="text/css"> *{margin:0;padding:0;} .drag-wrap{height: 300px;margin:10px;border:5px solid #FF8000;background:#8080C0;position: relative;} .draggable{width: 100px;height: 100px;position: absolute;top: 100px;left:100px;background:#eee;border:1px solid #aceaac;cursor: move;} </style></head><body> <div class="drag-wrap"> <div class="draggable" id="drag">拖动div</div> </div> <div class="drag-status" id="drag-status" style="height:30px;padding:0 10px;"></div> <script type="text/javascript"> /** *工具函数 */ var isIE = (document.all) ? true : false ; var $$ = function(id){ return "string" == typeof id ? document.getElementById(id) : id; }; var Class = { create: function() { return function() { this.initialize.apply(this, arguments); } } }; var Extend = function(destination,source){ for(var property in source){ destination[property] = source[property]; } }; var BindAsEventListener = function(object,func){ return function(event){ return func.call(object,event || window.event); } }; var Bind = function(object,func){ return function(){ return func.apply(object,arguments); } }; /** *跨浏览器事件对象 */ var EventUtil = { //事件注册处理程序 addEventHandler:function(oTarget,sEventType,fnHandler){ if(oTarget.addEventListener){ oTarget.addEventListener(sEventType,fnHandler,false); }else if(oTarget.attachEvent){ oTarget.attachEvent("on"+sEventType,fnHandler); }else{ oTarget["on"+sEventType] = fnHandler; } }, //事件移除处理程序 removeEventHandler:function(oTarget,sEventType,fnHandler){ if(oTarget.removeEventListener){ oTarget.removeEventListener(sEventType,fnHandler,false); }else if(oTarget.detachEvent){ oTarget.detachEvent("on"+sEventType,fnHandler); }else{ oTarget["on"+sEventType] = null; } }, getEvent:function(event){ return event ? event : window.event ; }, getTarget:function(event){ return event.target || event.srcElement; } }; /** *拖放程序 */ var simpleDrag = Class.create(); simpleDrag.prototype = { //初始化对象 initialize:function(drag){ this.Drag = $$(drag);//拖放对象 this._x = this._y = 0;//记录鼠标相对于拖放对象的位置 this._fM = BindAsEventListener(this, this.Move); //绑定拖动时执行的函数 this._fS = Bind(this, this.Stop); //绑定拖动结束执行的函数 this.Drag.style.position = "absolute"; EventUtil.addEventHandler(this.Drag, "mousedown", BindAsEventListener(this, this.Start)); //监听拖动对象mousedown事件 }, //准备拖动 Start:function(oEvent){ //记录mousedown触发时鼠标相对于拖放对象的位置 this._x = oEvent.clientX - this.Drag.offsetLeft; this._y = oEvent.clientY - this.Drag.offsetTop; //监听mousemove 和 mouseup事件 EventUtil.addEventHandler(document, "mousemove", this._fM); EventUtil.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(){ EventUtil.removeEventHandler(document, "mousemove", this._fM); EventUtil.removeEventHandler(document, "mouseup", this._fS); }, }; //初始化拖动 new simpleDrag('drag'); </script></body></html>