JS实现的相册图片左右滚动完整实例
作者：Blue Sky ......
这篇文章主要介绍了JS实现的相册图片左右滚动效果,结合完整实例形式分析了javascript事件触发与页面元素属性动态变换的相关操作技巧,需要的朋友可以参考下
本文实例讲述了JS实现的相册图片左右滚动效果。分享给大家供大家参考，具体如下：
执行左移右移函数：
var $get = function(id) {
return "string" == typeof id ? document.getElementById(id) : id;
};
var Extend = function(destination, source) {
for (var property in source) {
destination[property] = source[property];
}
return destination;
}
var CurrentStyle = function(element) {
return element.currentStyle || document.defaultView.getComputedStyle(element, null);
}
var Bind = function(object, fun) {
var args = Array.prototype.slice.call(arguments).slice(2);
return function() {
return fun.apply(object, args.concat(Array.prototype.slice.call(arguments)));
}
}
var Tween = {
Quart: {
easeOut: function(t, b, c, d) {
return -c * ((t = t / d - 1) * t * t * t - 1) + b;
}
},
Back: {
easeOut: function(t, b, c, d, s) {
if (s == undefined) s = 1.70158;
return c * ((t = t / d - 1) * t * ((s + 1) * t + s) + 1) + b;
}
},
Bounce: {
easeOut: function(t, b, c, d) {
if ((t /= d) < (1 / 2.75)) {
return c * (7.5625 * t * t) + b;
} else if (t < (2 / 2.75)) {
return c * (7.5625 * (t -= (1.5 / 2.75)) * t + .75) + b;
} else if (t < (2.5 / 2.75)) {
return c * (7.5625 * (t -= (2.25 / 2.75)) * t + .9375) + b;
} else {
return c * (7.5625 * (t -= (2.625 / 2.75)) * t + .984375) + b;
}
}
}
}
//容器对象,滑动对象,切换数量
var SlideTrans = function(container, slider, count, options) {
this._slider = $get(slider);
this._container = $get(container); //容器对象
this._timer = null; //定时器
this._count = Math.abs(count); //切换数量
this._target = 0; //目标值
this._t = this._b = this._c = 0; //tween参数
this.Index = 0; //当前索引
this.SetOptions(options);
this.Auto = !!this.options.Auto;
this.Duration = Math.abs(this.options.Duration);
this.Time = Math.abs(this.options.Time);
this.Pause = Math.abs(this.options.Pause);
this.Tween = this.options.Tween;
this.onStart = this.options.onStart;
this.onFinish = this.options.onFinish;
var bVertical = !!this.options.Vertical;
this._css = bVertical ? "top" : "left"; //方向
//样式设置
var p = CurrentStyle(this._container).position;
p == "relative" || p == "absolute" || (this._container.style.position = "relative");
this._container.style.overflow = "hidden";
this._slider.style.position = "absolute";
this.Change = this.options.Change ? this.options.Change :
this._slider[bVertical ? "offsetHeight" : "offsetWidth"] / this._count;
};
SlideTrans.prototype = {
//设置默认属性
SetOptions: function(options) {
this.options = {//默认值
Vertical: true, //是否垂直方向（方向不能改）
Auto: false, //是否自动
Change: 0, //改变量
Duration: 50, //滑动持续时间
Time: 10, //滑动延时
Pause: 2000, //停顿时间(Auto为true时有效)
onStart: function() { }, //开始转换时执行
onFinish: function() { }, //完成转换时执行
Tween: Tween.Quart.easeOut//tween算子
};
Extend(this.options, options || {});
},
//开始切换
Run: function(index) {
//修正index
index == undefined && (index = this.Index);
index < 0 && (index = this._count - 1) || index >= this._count && (index = 0);
//设置参数
this._target = -Math.abs(this.Change) * (this.Index = index);
this._t = 0;
this._b = parseInt(CurrentStyle(this._slider)[this.options.Vertical ? "top" : "left"]);
this._c = this._target - this._b;
this.onStart();
this.Move();
},
//移动
Move: function() {
clearTimeout(this._timer);
//未到达目标继续移动否则进行下一次滑动
if (this._c && this._t < this.Duration) {
this.MoveTo(Math.round(this.Tween(this._t++, this._b, this._c, this.Duration)));
this._timer = setTimeout(Bind(this, this.Move), this.Time);
} else {
this.MoveTo(this._target);
this.Auto && (this._timer = setTimeout(Bind(this, this.Next), this.Pause));
}
},
//移动到
MoveTo: function(i) {
this._slider.style[this._css] = i + "px";
},
//下一个
Next: function() {
this.Run(++this.Index);
},
//上一个
Previous: function() {
this.Run(--this.Index);
},
//停止
Stop: function() {
clearTimeout(this._timer); this.MoveTo(this._target);
}
};
在前天html加入div容器：
<!-- Icon scroll begin -->
<div style="text-align:center; width:100%; margin:auto auto">
<div class="container" id="idContainer" runat="server" >
</div>
</div>
<!--end-->
<!--左右滚动按钮-->
<div class="defaultprenext">
<table cellpadding=0 cellspacing=0 style="width:100%">
<tr>
<td style="width:40%; text-align:left; padding-left:6px">
<img id="ImgPre" alt="" src="ImageV3/Default/pre-gray.png" />
<span class="pager" id="Pre" style="color:Gray">Pre</span></td>
<td style="width:20%; text-align:center">
<div class="defaultprenextmid">
<div style="height:10px; vertical-align:middle; line-height:10px">
<img src="ImageV3/Default/greendot.png" id="Img1" />
<img src="ImageV3/Default/graydot.png" id="Img2" />
<img src="ImageV3/Default/graydot.png" id="Img3" />
</div>
</div>
</td>
<td style="width:40%; text-align:right; padding-right:6px">
<span class="pager" id="Next" style="color:#2f6417">Next</span>
<img id="ImgNext" alt="" src="ImageV3/Default/next-green.png" />
</td>
</tr>
</table>
</div>
下面是改变左右按钮可用状态
var imgNum = $get("idContainer").getElementsByTagName("img").length;
var pre = $get("Pre");
var next = $get("Next");
var i = 0;
if (imgNum > 0) {
var st = new SlideTrans("idContainer", "idSlider", 3, { Vertical: false });
if (i < 2) {
$get("Next").onclick = function() {
if (i < 2) {
st.Next();
i++;
if (i == 1) {
$get("ImgPre").src = "ImageV3/Default/pre-green.png";
pre.style.color = "#2f6417";
}
if (i == 2) {
$get("ImgNext").src = "ImageV3/Default/next-gray.png";
next.style.color = "Gray";
}
ChangePicIndex(i);
}
}
}
$get("Pre").onclick = function() {
if (i > 0) {
st.Previous();
$get("ImgNext").src = "ImageV3/Default/next-green.png";
next.style.color = "#2f6417";
i--;
if (i == 0) {
$get("ImgPre").src = "ImageV3/Default/pre-gray.png";
pre.style.color = "Gray";
}
ChangePicIndex(i);
}
}
st.Run();
}
function ChangePicIndex(index) {
switch (index) {
case 1:
$get("Img1").src = "ImageV3/Default/graydot.png";
$get("Img2").src = "ImageV3/Default/greendot.png";
$get("Img3").src = "ImageV3/Default/graydot.png";
break
case 2:
$get("Img1").src = "ImageV3/Default/graydot.png";
$get("Img2").src = "ImageV3/Default/graydot.png";
$get("Img3").src = "ImageV3/Default/greendot.png";
break
default:
$get("Img1").src = "ImageV3/Default/greendot.png";
$get("Img2").src = "ImageV3/Default/graydot.png";
$get("Img3").src = "ImageV3/Default/graydot.png";
}
}
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