JavaScript 无缝上下左右滚动加定高定宽停顿效果

• 2009-09-23
• 2522 View

根据无缝滚动和八向滚动修改而来，特点是能同一程序中分别向四个方向移动。
对滚动框内的样式设置有些要求。

效果：
var $$ = function (id) { return "string" == typeof id ? document.getElementById(id) : id; }; var Class = { create: function() { return function() { this.initialize.apply(this, arguments); } } } Object.extend = function(destination, source) { for (var property in source) { destination[property] = source[property]; } return destination; } function addEventHandler(oTarget, sEventType, fnHandler) { if (oTarget.addEventListener) { oTarget.addEventListener(sEventType, fnHandler, false); } else if (oTarget.attachEvent) { oTarget.attachEvent("on" + sEventType, fnHandler); } else { oTarget["on" + sEventType] = fnHandler; } }; var Scroller = Class.create(); Scroller.prototype = { initialize: function(idScroller, idScrollMid, options) { var oThis = this, oScroller = $$(idScroller), oScrollMid = $$(idScrollMid); this.SetOptions(options); this.Side = this.options.Side || ["up"];//方向 this.scroller = oScroller; //对象 this.speed = this.options.Speed; //速度 this.timer = null; //时间 this.pauseHeight = 0; //定高 this.pauseWidth = 0; //定宽 this.pause = 0; //定高(宽) this.side = 0; //参数 //用于上下滚动 this.heightScroller = parseInt(oScroller.style.height) || oScroller.offsetHeight; this.heightList = oScrollMid.offsetHeight; //用于左右滚动 this.widthScroller = parseInt(oScroller.style.width) || oScroller.offsetWidth; this.widthList = oScrollMid.offsetWidth; //js取不到css设置的height和width oScroller.style.overflow = "hidden"; oScrollMid.appendChild(oScrollMid.cloneNode(true)); oScrollMid.appendChild(oScrollMid.cloneNode(true)); addEventHandler(oScroller, "mouseover", function() { oThis.Stop(); }); addEventHandler(oScroller, "mouseout", function() { oThis.Start(); }); this.Start(); }, //设置默认属性 SetOptions: function(options) { this.options = {//默认值 Step: 1,//每次变化的px量 Speed: 20,//速度(越大越慢) Side: ["up"],//滚动方向:"up"是上，"down"是下，"left"是左，"right"是右 PauseHeight: 0,//隔多高停一次 PauseWidth: 0,//隔多宽停一次 //当上下和左右一起使用时必须设置PauseHeight和PauseWidth来设置转向位置 PauseStep: 1000//停顿时间(PauseHeight或PauseWidth大于0该参数才有效) }; Object.extend(this.options, options || {}); }, //转向 Turn: function() { //通过设置方向数组的排列来转向 this.Side.push(this.Side.shift().toLowerCase()); }, //上下滚动 ScrollUpDown: function() { this.pause = this.pauseHeight; this.scroller.scrollTop = this.GetScroll(this.scroller.scrollTop, this.heightScroller, this.heightList, this.options.PauseHeight); this.pauseHeight = this.pause; var oThis = this; this.timer = window.setTimeout(function(){ oThis.Start(); }, this.speed); }, //左右滚动 ScrollLeftRight: function() { this.pause = this.pauseWidth; //注意:scrollLeft超过1400会自动变回1400 注意长度 this.scroller.scrollLeft = this.GetScroll(this.scroller.scrollLeft, this.widthScroller, this.widthList, this.options.PauseWidth); this.pauseWidth = this.pause; var oThis = this; this.timer = window.setTimeout(function(){ oThis.Start(); }, this.speed); }, //获取设置滚动数据 GetScroll: function(iScroll, iScroller, iList, iPause) { var iStep = this.options.Step * this.side; if(this.side > 0){ if(iScroll >= (iList * 2 - iScroller)){ iScroll -= iList; } } else { if(iScroll <= 0){ iScroll += iList; } } this.speed = this.options.Speed; if(iPause > 0){ if(Math.abs(this.pause) >= iPause){ this.speed = this.options.PauseStep; this.pause = iStep = 0; this.Turn(); } else { this.pause += iStep; } } return (iScroll + iStep); }, //开始 Start: function() { //document.getElementById("test").innerHTML+=sTurn+","; //方向设置 switch (this.Side[0].toLowerCase()) { case "right" : if(this.widthList < this.widthScroller) return; this.side = -1; this.ScrollLeftRight(); break; case "left" : if(this.widthList < this.widthScroller) return; this.side = 1; this.ScrollLeftRight(); break; case "down" : if(this.heightList < this.heightScroller) return; this.side = -1; this.ScrollUpDown(); break; case "up" : default : if(this.heightList < this.heightScroller) return; this.side = 1; this.ScrollUpDown(); } }, //停止 Stop: function() { clearTimeout(this.timer); } }; .Scroller {line-height:50px; border:1px solid #000000; padding:0px 10px; height:50px; width:400px;} .Scroller *{margin:0px; padding:0px;} .ScrollMid {float:left;} .ScrollMid ul{width:800px;float:left;} .ScrollMid li{list-style:none; float:left; width:390px; padding-left:10px;line-height:50px; }

new Scroller("idScroller", "idScrollMid",{ Side:["up","left"], PauseHeight:50, PauseWidth:400 });
代码：