JavaScript 拖放效果_html/css_WEB-ITnose
Jun 24, 2016 am 11:53 AM
拖放效果，也叫拖拽、拖動(dòng)。一個(gè)簡單的拖放效果
拖動(dòng)div
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【程序說明】
首先初始化函數(shù)，對(duì)拖放對(duì)象添加mousedown監(jiān)聽事件
initialize:function(drag){ this.Drag = $$(drag);//拖放對(duì)象 this._x = this._y = 0;//記錄鼠標(biāo)相對(duì)于拖放對(duì)象的位置 this._fM = BindAsEventListener(this, this.Move); //綁定拖動(dòng)時(shí)執(zhí)行的函數(shù) this._fS = Bind(this, this.Stop); //綁定拖動(dòng)結(jié)束執(zhí)行的函數(shù) this.Drag.style.position = "absolute"; EventUtil.addEventHandler(this.Drag, "mousedown", BindAsEventListener(this, this.Start)); //監(jiān)聽拖動(dòng)對(duì)象mousedown事件 } 之后在Start方法添加mousemove和mouseup事件，分別監(jiān)聽拖放對(duì)象的位置和取消監(jiān)聽事件
Start:function(oEvent){ //記錄mousedown觸發(fā)時(shí)鼠標(biāo)相對(duì)于拖放對(duì)象的位置 this._x = oEvent.clientX - this.Drag.offsetLeft; this._y = oEvent.clientY - this.Drag.offsetTop; //監(jiān)聽mousemove 和 mouseup事件 EventUtil.addEventHandler(document, "mousemove", this._fM); EventUtil.addEventHandler(document, "mouseup", this._fS); } 完整拖放程序：
/** *拖放程序 */ var simpleDrag = Class.create(); simpleDrag.prototype = { //初始化對(duì)象 initialize:function(drag){ this.Drag = $$(drag);//拖放對(duì)象 this._x = this._y = 0;//記錄鼠標(biāo)相對(duì)于拖放對(duì)象的位置 this._fM = BindAsEventListener(this, this.Move); //綁定拖動(dòng)時(shí)執(zhí)行的函數(shù) this._fS = Bind(this, this.Stop); //綁定拖動(dòng)結(jié)束執(zhí)行的函數(shù) this.Drag.style.position = "absolute"; EventUtil.addEventHandler(this.Drag, "mousedown", BindAsEventListener(this, this.Start)); //監(jiān)聽拖動(dòng)對(duì)象mousedown事件 }, //準(zhǔn)備拖動(dòng) Start:function(oEvent){ //記錄mousedown觸發(fā)時(shí)鼠標(biāo)相對(duì)于拖放對(duì)象的位置 this._x = oEvent.clientX - this.Drag.offsetLeft; this._y = oEvent.clientY - this.Drag.offsetTop; //監(jiān)聽mousemove 和 mouseup事件 EventUtil.addEventHandler(document, "mousemove", this._fM); EventUtil.addEventHandler(document, "mouseup", this._fS); }, //拖動(dòng) Move:function(oEvent){ this.Drag.style.left = oEvent.clientX - this._x + "px"; this.Drag.style.top = oEvent.clientY - this._y + "px"; }, //停止拖動(dòng) Stop:function(){ EventUtil.removeEventHandler(document, "mousemove", this._fM); EventUtil.removeEventHandler(document, "mouseup", this._fS); }, }; //初始化拖動(dòng) new simpleDrag('drag'); 完整DEMO：
<!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">拖動(dòng)div</div> </div> <div class="drag-status" id="drag-status" style="height:30px;padding:0 10px;"></div> <script type="text/javascript"> /** *工具函數(shù) */ var isIE = (document.all) ? true : false ; var $$ = function(id){ return "string" == typeof id ? document.getElementById(id) : id; }; var Class = { create: function() { return function() { this.initialize.apply(this, arguments); } } }; var Extend = function(destination,source){ for(var property in source){ destination[property] = source[property]; } }; var BindAsEventListener = function(object,func){ return function(event){ return func.call(object,event || window.event); } }; var Bind = function(object,func){ return function(){ return func.apply(object,arguments); } }; /** *跨瀏覽器事件對(duì)象 */ var EventUtil = { //事件注冊(cè)處理程序 addEventHandler:function(oTarget,sEventType,fnHandler){ if(oTarget.addEventListener){ oTarget.addEventListener(sEventType,fnHandler,false); }else if(oTarget.attachEvent){ oTarget.attachEvent("on"+sEventType,fnHandler); }else{ oTarget["on"+sEventType] = fnHandler; } }, //事件移除處理程序 removeEventHandler:function(oTarget,sEventType,fnHandler){ if(oTarget.removeEventListener){ oTarget.removeEventListener(sEventType,fnHandler,false); }else if(oTarget.detachEvent){ oTarget.detachEvent("on"+sEventType,fnHandler); }else{ oTarget["on"+sEventType] = null; } }, getEvent:function(event){ return event ? event : window.event ; }, getTarget:function(event){ return event.target || event.srcElement; } }; /** *拖放程序 */ var simpleDrag = Class.create(); simpleDrag.prototype = { //初始化對(duì)象 initialize:function(drag){ this.Drag = $$(drag);//拖放對(duì)象 this._x = this._y = 0;//記錄鼠標(biāo)相對(duì)于拖放對(duì)象的位置 this._fM = BindAsEventListener(this, this.Move); //綁定拖動(dòng)時(shí)執(zhí)行的函數(shù) this._fS = Bind(this, this.Stop); //綁定拖動(dòng)結(jié)束執(zhí)行的函數(shù) this.Drag.style.position = "absolute"; EventUtil.addEventHandler(this.Drag, "mousedown", BindAsEventListener(this, this.Start)); //監(jiān)聽拖動(dòng)對(duì)象mousedown事件 }, //準(zhǔn)備拖動(dòng) Start:function(oEvent){ //記錄mousedown觸發(fā)時(shí)鼠標(biāo)相對(duì)于拖放對(duì)象的位置 this._x = oEvent.clientX - this.Drag.offsetLeft; this._y = oEvent.clientY - this.Drag.offsetTop; //監(jiān)聽mousemove 和 mouseup事件 EventUtil.addEventHandler(document, "mousemove", this._fM); EventUtil.addEventHandler(document, "mouseup", this._fS); }, //拖動(dòng) Move:function(oEvent){ this.Drag.style.left = oEvent.clientX - this._x + "px"; this.Drag.style.top = oEvent.clientY - this._y + "px"; }, //停止拖動(dòng) Stop:function(){ EventUtil.removeEventHandler(document, "mousemove", this._fM); EventUtil.removeEventHandler(document, "mouseup", this._fS); }, }; //初始化拖動(dòng) new simpleDrag('drag'); </script></body></html> ?
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