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锁定老帖子 主题:发觉prototype.js真是神来之笔啊
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发表时间:2006-08-20
var dragger = new Dragger();; dragger.makeDraggable ({targetObj:targetDiv,objContainer:targetDiv1});; dragger.makeDraggable({targetObj:targetDiv1});; 需要拖动的是两个Div: <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> <HTML> <HEAD> <TITLE> New Document </TITLE> <META NAME="Generator" CONTENT="EditPlus"> <META NAME="Author" CONTENT=""> <META NAME="Keywords" CONTENT=""> <META NAME="Description" CONTENT=""> <style> #targetDiv{ background-color:#996600; border:#333333 solid 1px; width:100px; height:100px } #targetDiv1{ background-color:#666600; border:#333333 solid 2px; width:400px; height:400px } </style> <script src="prototype.js"></script> <script src="EasyDrag.js"></script> <script> function window::onload(); { var dragger = new Dragger();; dragger.makeDraggable({targetObj:targetDiv,objContainer:targetDiv1});; dragger.makeDraggable({targetObj:targetDiv1});; } </script> </HEAD> <BODY> dd <div id="targetDiv" style="position:absolute;top:120px;left:100px;display:visibility; z-index:2">拖我!!!</div> <div id="targetDiv1" style="position:absolute;top:120px;left:100px;display:visibility;z-index:1">拖我!!!</div> </BODY> </HTML> prototype.js从这里下载:http://prototype.conio.net/ 这是我写的那个EasyDrag JS对象: /** *@(#);EasyDrag.js * 版本号 1.0 * *修订记录: *1);更改者:陈雄华 * 时 间:2006-8-20 * 描 述:创建 * * 功能说明: * 使组件拥有移动的功能, * 1.实例化var dragger = Dragger();对象 * 2.利用dragger.makeDraggable(parameters);方法使组件具备拖动功能 * 其中parameters是一个匿名类,该 匿 名 类 有 以下 的属性: * 1);targetObj:需要移动的目标组件,对象名或对象实例,可选 * 2);objContainer:包装targetObj的组件,即组件只能在该包装组件内部移动,可选,默认为document.body * 如果需要进行特殊的移动,可手工提供以下方法 * 3);onMouseDown:鼠标左键按下时响应的方法,传入方法名 * 4);onMouseMove: 鼠标左键按下并拖动时响应的方法,传入方法名 * 5);onMouseUp: 鼠标左键弹起时响应的方法,传入方法名 * 例1: * function test(); * { * var dragger = new Dragger();; * dragger.makeDraggable({targetObj:targetDiv,objContainer:targetDiv1});; * dragger.makeDraggable({targetObj:targetDiv1});; * } * <div id="targetDiv" style="position:absolute;top:120px;left:100px;display:visibility; z-index:2">asdfasdf</div> * <div id="targetDiv1" style="position:absolute;top:120px;left:100px;display:visibility;z-index:1">asdfasdf</div> */ var Dragger = Class.create();; Dragger.prototype={ initialize:function();{ this.dragArray = new Array();; }, makeDraggable:function(parameters);{ var item = new DraggerItem(parameters);; this.dragArray.push(item);; } }; var DraggerItem = Class.create();; DraggerItem.prototype={ initialize:function(parameters); { this.targetObj = parameters.targetObj; this.objContainer = parameters.objContainer?parameters.objContainer:document.body; this.ponMouseDown = parameters.onMouseDown; this.ponMouseMove = parameters.onMouseMove; this.ponMouseUp = parameters.onMouseUp; this.targetObj.onmousedown = this.ponMouseDown?this.ponMouseDown.bind(this);: this.onMouseDown.bind(this);; this.targetObj.onmousemove = this.ponMouseMove?this.ponMouseMove.bind(this);: this.onMouseMove.bind(this);; this.targetObj.onmouseup = this.ponMouseUp?this.ponMouseUp.bind(this);: this.onMouseUp.bind(this);; this.caculateBorderCoor();; }, caculateBorderCoor:function(); { //默认容器,即document if(this.objContainer == document.body); { //左边框坐标 this.x0 = this.objContainer.clientLeft; //右边框坐标 this.x1 = this.objContainer.clientWidth; //上边框坐标 this.y0 = this.objContainer.clientTop; //下边框坐标 this.y1 = this.objContainer.clientHeight; } else//是Div { var body = document.body; //左边框坐标 this.x0 = this.objContainer.offsetLeft; //右边框坐标 this.x1 = this.x0 + this.objContainer.offsetWidth - body.clientLeft; //上边框坐标 this.y0 = body.clientTop + this.objContainer.offsetTop; //下边框坐标 this.y1 = this.y0+ this.objContainer.clientHeight - body.clientTop; } }, onMouseDown:function(); { if(event.button==1);//按下左键 { if(this.ponMouseDown); { Try.these( this.ponMouseDown );; } else { this.targetObj.moveable = true; this.targetObj.setCapture();; this.startX=parseInt(this.targetObj.style.left);; this.startY=parseInt(this.targetObj.style.top);; this.mouseX=event.clientX; this.mouseY=event.clientY; } } }, onMouseMove:function(); { if(event.button==1);//按下左键 { if(this.ponMouseMove); { Try.these( this.ponMouseMove );; } else if(this.targetObj.moveable); { var left = this.startX + event.clientX - this.mouseX; var top = this.startY + event.clientY - this.mouseY; //超过容器左边框或上边框时 left = left < this.x0?this.x0:left; top = top < this.y0?this.y0:top; //超过容器左边框或下边框时 this.targetObj.style.left= left >(this.x1-this.targetObj.clientWidth);? (this.x1-this.targetObj.clientWidth);:left; this.targetObj.style.top= top > (this.y1 - this.targetObj.clientHeight);? (this.y1 - this.targetObj.clientHeight);:top; window.status =""+left+","+top; } } }, onMouseUp:function(); { if(event.button==1);//按下左键 { if(this.ponMouseUp); { Try.these( this.ponMouseUp );; } else if(this.targetObj.moveable); { this.targetObj.moveable = false; this.targetObj.releaseCapture();; } } } } 声明:ITeye文章版权属于作者,受法律保护。没有作者书面许可不得转载。
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发表时间:2006-08-21
scriptaculous里有更加现成的实现,两三行代码就可以搞定你上面的功能
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发表时间:2006-08-21
这个好像与Prototype无关吧.
Class.Create()可以用这句代码代替 var Dragger = function(){this.initialize.apply(this, arguments);}; bind也可以这样来达到同样的效果 var oThis = this; this.targetObj.onmousedown = function(evt) { var evt = (evt== null?window.event:evt); return oThis.onmousedown(evt); }; 并且按照你那样不用bindAsListener的话,结果就是IE only了,不是对Prototype的浪费啊 并且为什么要在每个地方都去判断onmousedown之类的函数,一次搞定多好. 没研究过Drag,原来是直接改坐标.... |
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发表时间:2006-08-21
oh dear god, lz 写的 跟prototype有什么关系?
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发表时间:2006-08-22
写那么复杂干什么...
还有不少地方容易引起Memory Leak... -_-b |
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