本文实例讲述了JavaScript实现图片DIV竖向滑动的方法。分享给大家供大家参考。具体实现方法如下：
<!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>图片滑动展示效果</title>
<script type="text/javascript">
var $$ = function (id) {
return "string" == typeof id ? document.getElementById(id) : id;
};
function Event(e){
var oEvent = document.all ? window.event : e;
if (document.all) {
if(oEvent.type == "mouseout") {
oEvent.relatedTarget = oEvent.toElement;
}else if(oEvent.type == "mouseover") {
oEvent.relatedTarget = oEvent.fromElement;
}
}
return oEvent;
}
function addEventHandler(oTarget, sEventType, fnHandler) {
if (oTarget.addEventListener) {
oTarget.addEventListener(sEventType, fnHandler, false);
} else if (oTarget.attachEvent) {
oTarget.attachEvent("on" + sEventType, fnHandler);
} else {
oTarget["on" + sEventType] = fnHandler;
}
};
var Class = {
create: function() {
return function() {
this.initialize.apply(this, arguments);
}
}
}
Object.extend = function(destination, source) {
for (var property in source) {
destination[property] = source[property];
}
return destination;
}
var GlideView = Class.create();
GlideView.prototype = {
//容器对象 容器宽度 展示标签 展示宽度
initialize: function(obj, iHeight, sTag, iMaxHeight, options) {
var oContainer = $$(obj), oThis=this, len = 0;
this.SetOptions(options);
this.Step = Math.abs(this.options.Step);
this.Time = Math.abs(this.options.Time);
this._list = oContainer.getElementsByTagName(sTag);
len = this._list.length;
this._count = len;
this._height = parseInt(iHeight / len);
this._height_max = parseInt(iMaxHeight);
this._height_min = parseInt((iHeight - this._height_max) / (len - 1));
this._timer = null;
this.Each(function(oList, oText, i){
oList._target = this._height * i;//自定义一个属性放目标left
oList.style.top = oList._target + "px";
oList.style.position = "absolute";
addEventHandler(oList, "mouseover", function(){ oThis.Set.call(oThis, i); });
})
//容器样式设置
oContainer.style.height = iHeight + "px";
oContainer.style.overflow = "hidden";
oContainer.style.position = "relative";
//移出容器时返回默认状态
addEventHandler(oContainer, "mouseout", function(e){
//变通防止执行oList的mouseout
var o = Event(e).relatedTarget;
if (oContainer.contains ? !oContainer.contains(o) : oContainer != o && !(oContainer.compareDocumentPosition(o) & 16)) oThis.Set.call(oThis, -1);
})
},
//设置默认属性
SetOptions: function(options) {
this.options = {//默认值
Step:20,//滑动变化率
Time:3,//滑动延时
TextTag:"",//说明容器tag
TextHeight: 0//说明容器高度
};
Object.extend(this.options, options || {});
},
//相关设置
Set: function(index) {
if (index < 0) {
//鼠标移出容器返回默认状态
this.Each(function(oList, oText, i){ oList._target = this._height * i; if(oText){ oText._target = this._height_text; } })
} else {
//鼠标移到某个滑动对象上
this.Each(function(oList, oText, i){
oList._target = (i <= index) ? this._height_min * i : this._height_min * (i - 1) + this._height_max;
if(oText){ oText._target = (i == index) ? 0 : this._height_text; }
})
}
this.Move();
},
//移动
Move: function() {
clearTimeout(this._timer);
var bFinish = true;//是否全部到达目标地址
this.Each(function(oList, oText, i){
var iNow = parseInt(oList.style.top), iStep = this.GetStep(oList._target, iNow);
if (iStep != 0) { bFinish = false; oList.style.top = (iNow + iStep) + "px"; }
})
//未到达目标继续移动
if (!bFinish) { var oThis = this; this._timer = setTimeout(function(){ oThis.Move(); }, this.Time); }
},
//获取步长
GetStep: function(iTarget, iNow) {
var iStep = (iTarget - iNow) / this.Step;
if (iStep == 0) return 0;
if (Math.abs(iStep) < 1) return (iStep > 0 ? 1 : -1);
return iStep;
},
Each:function(fun) {
for (var i = 0; i < this._count; i++)
fun.call(this, this._list[i], (this.Showtext ? this._text[i] : null), i);
}
};
</script>
<style type="text/css">
#idGlideView {
height:314px;
width:325px;
margin:0 auto;
}
#idGlideView div {
width:325px;
height:314px;
}
</style>
</head>
<body>
<div id="idGlideView">
<div style="background-color:#006699;"> 鼠标移到这里试试看！</div>
<div style="background-color:#FF9933;"> 鼠标移到这里试试看！</div>
</div>
<div>https://www.jb51.net/</div>
<SCRIPT>
var gv = new GlideView("idGlideView", 314, "div", 280,"");
</SCRIPT>
</body>
</html>
希望本文所述对大家的javascript程序设计有所帮助。
