原生Js实现按的数据源均分时间点幻灯片效果(已封装)_javascript技巧



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
代码如下:
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 += '

';
}
//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 = '' + (JSONData[pointIndex]['date'] || '') + '';
title.innerHTML = '' + (JSONData[pointIndex]['title'] || '') + '';
//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);
}
}
}