原生Js实现按的数据源均分时间点幻灯片效果(已封装)

建议在Chrom,Firefox,Opera,Safari等标准浏览器中查看. Ie下没有阴影及圆角.

实现了根据源数据(样例中是一个JSON数据组)总条数, 均分出时间点以平滑向右动画方式显示在时间线上, 当鼠标划过时间点时, 显示对应的日期及标题. 鼠标划过事件, 充分考虑了用户体验, 当用户快速(无意识移动)从时间点上划过时, 并不触发相应事件.

相关的方法说明及使用, 请参见下面的注释或发评论, 同时也欢迎大家找bug并提交.



Js核心代码点此查看样例

var JSONData=[{...},{...},...];//数据源,一切皆因它而生,因它而灭 

function iTimePoint(iTimeSlideId, dateId, timeLineId, titleTop, titleId, defaultShow){ 
/* 传入参数说明: 
* iTimeSlideId: 外围ID名. 本样例DOM中#itimeslide; 
* dateId: 日期ID名. 本样例DOM中#date; 
* timeLineId: 时间点分布ID名. 本样例DOM中#timeline; 
* titleTop: 标题容器上方小三角ID名. 本样例DOM中#titletop; 
* titleId: 标题容器ID名. 本样例DOM中#title; 
* defaultShow: 设定初始显示的时间点, 默认为0, 可不传值 
*/ 

//参数判断,测试用,成功运行后可删除 
if (arguments.length < 5 || arguments.length>6) { 
alert('参数传入错误,请传入5或6个值! :)'); 
return false; 
} 

//通用方法 
var iBase = { 
//document.getElementById 
Id: function(name){ 
return document.getElementById(name); 
}, 
//时间点动画显示 
PointSlide: function(elem, val){ 
//可通过修改i+=5中的5控制滑动速度 
for (var i = 0; i <= 100; i += 5) { 
(function(){ 
//这个pos定义很重要,若直接使用闭包获取到的不是上面的i 
var pos = i; 
//平滑移动 
setTimeout(function(){ 
elem.style.left = pos * val / 100 + 'px'; 
}, (pos + 1) * 10); 
})(); 
} 
}, 
//为元素添加样式 
AddClass: function(elem, val){ 
//若元素无class,直接赋值 
if (!elem.className) { 
elem.className = val; 
}else { 
//否则通过添加空格新增一个class 
var oVal = elem.className; 
oVal += ' '; 
oVal += val; 
elem.className = val; 
} 
}, 
//获取元素索引 
Index: function(cur, obj){ 
for (var i = 0; i < obj.length; i++) { 
if (obj[i] == cur) { 
return i; 
} 
} 
} 
} 
//整个函数变量定义区 
var dataLen = JSONData.length; 
var iTimeSilde = iBase.Id(iTimeSlideId); 
var date = iBase.Id(dateId); 
var timeLine = iBase.Id(timeLineId); 
var titletop = iBase.Id(titleTop); 
var title = iBase.Id(titleId); 
var iTimeSildeW = iTimeSilde.offsetWidth;//幻灯区实际宽度 
var timePoint = document.createElement('ul');//用来存储时间点的ul 
var timePointLeft = null;//时间点相对于父元素左边距离 
var timePointLeftCur = null;//每两个时间点间距 
var pointIndex = 0;//时间点在队列中的索引值 
var defaultShow = defaultShow || 0;//默认显示的时间 
var clearFun=null;//当用户无意识的划过时中止执行 
var that=null; 
//根据数据条数生成对应的时间点html 
for (var i = 0; i < dataLen; i++) { 
timePoint.innerHTML += '<li></li>'; 
} 
//将时间点插入到时间线DIV中 
timeLine.appendChild(timePoint) 
var timePoints = timeLine.getElementsByTagName('li'); 
//时间点平滑显示 
for (var i = 0; i < timePoints.length; i++) { 
//每两个时间点间间距 
timePointLeftCur = parseInt(iTimeSildeW / (dataLen + 1)); 
//计算对应时间点左边距 
timePointLeft = (i + 1) * timePointLeftCur; 
//时间点动画形式初始化 
iBase.PointSlide(timePoints[i], timePointLeft); 
//初始显示时间点 
setTimeout(function(){ 
timePoints[defaultShow].onmouseover(); 
}, 1200); 
//获取时间点默认class值,为鼠标事件做准备 
timePoints[i].oldClassName = timePoints[i].className; 
timePoints[i].onmouseover = function(){ 
that = this;//确保clearFun中的this是当前的this 
//提升用户体验,当用户无意识地划过时不执行函数 
clearFun=setTimeout(function(){ 
//计算出当前时间点索引值,为鼠标划出做准备 
pointIndex = iBase.Index(that, timePoints); 
//去除上一个时间点高亮样式 
for (var m = 0; m < timePoints.length; m++) { 
if (m != pointIndex) { 
timePoints[m].className = timePoints[m].oldClassName 
} 
} 
//为当前时间点加载高亮样式 
iBase.AddClass(that, 'hover'); 
//切换日期及标题值 
date.innerHTML = '<span>' + (JSONData[pointIndex]['date'] || '') + '</span><EM></EM>'; 
title.innerHTML = '<a href="' + (JSONData[pointIndex]['href'] || '') + '">' + (JSONData[pointIndex]['title'] || '') + '</a>'; 
//改变日期及标题的位置,此处减去的数字,可根据实际样式调整 
date.style.left = ((pointIndex + 1) * timePointLeftCur - 25) + 'px'; 
titletop.style.left = ((pointIndex + 1) * timePointLeftCur + 6) + 'px'; 
//当标题框左边距与标题框宽度之和大于外围宽度时,以右边为绝对点 
if ((title.offsetWidth + (pointIndex + 1) * timePointLeftCur) < iTimeSildeW) { 
title.style.left = ((pointIndex + 1) * timePointLeftCur - timePointLeftCur) + 'px'; 
}else { 
title.style.left = (iTimeSildeW - title.offsetWidth) + 'px'; 
} 
//显示日期/时间点/标题 
date.style.display = 'block'; 
titletop.style.display = 'block'; 
title.style.display = 'block'; 
},200);//200为认定无意识划过的时间,可自行调节 
} 
timePoints[i].onmouseout = function(){ 
//若停留时间低于200ms,认定为无意识划过,中止函数 
clearTimeout(clearFun); 
} 
} 
}