JavaScript 图片切换展示效果alibaba拓展版
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首先需要一个容器,设置它的overflow为hidden,position为relative;
容器里面还要一个滑动对象,设置它的position为absolute;
在initialize()函数里初始化一些属性。
在切换之前先执行Start()函数,进行相关设置,
主要是设置Index属性(索引)和_target属性(目标值):
if(this.Index < 0){
this.Index = this._count - 1;
} else if (this.Index >= this._count){ this.Index = 0; }
this._target = -1 * this._parameter * this.Index;
接着就执行Move()函数开始移动了,原理通过设置滑动对象的top(或left)来做出移动的效果,
而减速的效果就需要执行GetStep()函数来获取步长:
var iStep = (iTarget - iNow) / this.Step;用目标值减当前值再除以一个参数,得到步长,
这样取得的步长在当前值越接近目标值时会越来越小,也做成了减速的效果,
然后在top(或left)的设置中加上这个步长,并设置定时器继续Move(),直到到达目标值:
this._slider.style[style] = (iNow + iStep) + "px";
this._timer = setTimeout(function(){ oThis.Move(); }, this.Time);
下面例子里的容器结构:
<div class="container" id="idTransformView">
<ul class="slider" id="idSlider">
<li><img src="http://shundebk.cn/temp/https://img.qb5200.com/download-x/20200511/25840.jpg"/></li>
<li><img src="http://shundebk.cn/temp/https://img.qb5200.com/download-x/20200511/25841.jpg"/></li>
<li><img src="http://shundebk.cn/temp/https://img.qb5200.com/download-x/20200511/25842.gif"/></li>
</ul>
<ul class="num" id="idNum">
<li>1</li>
<li>2</li>
<li>3</li>
</ul>
</div>
要美观的话需要css设置一下:
.container, .container *{margin:0; padding:0;}
.container{width:408px; height:168px; overflow:hidden;}
.slider{position:absolute;}
.slider li{ list-style:none;display:inline;}
.slider img{ width:408px; height:168px; display:block;}
.slider2{width:2000px;}
.slider2 li{float:left;}
.num{ position:absolute; right:5px; bottom:5px;}
.num li{
float: left;
color: #FF7300;
text-align: center;
line-height: 16px;
width: 16px;
height: 16px;
font-family: Arial;
font-size: 12px;
cursor: pointer;
overflow: hidden;
margin: 3px 1px;
border: 1px solid #FF7300;
background-color: #fff;
}
.num li.on{
color: #fff;
line-height: 21px;
width: 21px;
height: 21px;
font-size: 16px;
margin: 0 1px;
border: 0;
background-color: #FF7300;
font-weight: bold;
}
样式的设置跟程序也有一定关系,例如宽和高,这里就不说明了。
接着就可以实例化了:
var tv = new TransformView ("idTransformView", "idSlider", 168, 3, {
onStart : function(){ Each(objs, function(o, i) { o.className = tv.Index == i ? "on" : ""; }) }//按钮样式
});
这里主要有4个参数,分别是容器对象、滑动对象、切换参数和切换数量。
当程序是上下切换时,切换参数切换的高度,当左右切换时,是切换的宽度。
切换数量就是有多少个切换对象了,例如上面的例子就是3个。
最后的参数是一些设置:
属性: 默认值//说明
Up: true,//是否向上(否则向左)
Step: 5,//滑动变化率
Time: 10,//滑动延时
Auto: true,//是否自动转换
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
例子里设置了onStart属性,作用是在切换开始时,设置按钮的样式
例子里完整的测试代码:
function Each(list, fun){
for (var i = 0, len = list.length; i < len; i++) { fun(list[i], i); }
};
var objs = $("idNum").getElementsByTagName("li");
var tv = new TransformView("idTransformView", "idSlider", 168, 3, {
onStart : function(){ Each(objs, function(o, i) { o.className = tv.Index == i ? "on" : ""; }) }//按钮样式
});
tv.Start();
Each(objs, function (o, i){
o.onmouseover = function(){
o.className = "on";
tv.Auto = false;
tv.Index = i;
tv.Start();
}
o.onmouseout = function(){
o.className = "";
tv.Auto = true;
tv.Start();
}
})
源码:
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;
}
var TransformView = Class.create();
TransformView.prototype = {
//容器对象,滑动对象,切换参数,切换数量
initialize: function(container, slider, parameter, count, options) {
if(parameter <= 0 || count <= 0) return;
var oContainer = $(container), oSlider = $(slider), oThis = this;
this.Index = 0;//当前索引
this._timer = null;//定时器
this._slider = oSlider;//滑动对象
this._parameter = parameter;//切换参数
this._count = count || 0;//切换数量
this._target = 0;//目标参数
this.SetOptions(options);
this.Up = !!this.options.Up;
this.Step = Math.abs(this.options.Step);
this.Time = Math.abs(this.options.Time);
this.Auto = !!this.options.Auto;
this.Pause = Math.abs(this.options.Pause);
this.onStart = this.options.onStart;
this.onFinish = this.options.onFinish;
oContainer.style.overflow = "hidden";
oContainer.style.position = "relative";
oSlider.style.position = "absolute";
oSlider.style.top = oSlider.style.left = 0;
},
//设置默认属性
SetOptions: function(options) {
this.options = {//默认值
Up: true,//是否向上(否则向左)
Step: 5,//滑动变化率
Time: 10,//滑动延时
Auto: true,//是否自动转换
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
};
Object.extend(this.options, options || {});
},
//开始切换设置
Start: function() {
if(this.Index < 0){
this.Index = this._count - 1;
} else if (this.Index >= this._count){ this.Index = 0; }
this._target = -1 * this._parameter * this.Index;
this.onStart();
this.Move();
},
//移动
Move: function() {
clearTimeout(this._timer);
var oThis = this, style = this.Up ? "top" : "left", iNow = parseInt(this._slider.style[style]) || 0, iStep = this.GetStep(this._target, iNow);
if (iStep != 0) {
this._slider.style[style] = (iNow + iStep) + "px";
this._timer = setTimeout(function(){ oThis.Move(); }, this.Time);
} else {
this._slider.style[style] = this._target + "px";
this.onFinish();
if (this.Auto) { this._timer = setTimeout(function(){ oThis.Index++; oThis.Start(); }, this.Pause); }
}
},
//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;
},
//停止
Stop: function(iTarget, iNow) {
clearTimeout(this._timer);
this._slider.style[this.Up ? "top" : "left"] = this._target + "px";
}
};
[Ctrl+A 全选 注:如需引入外部Js需刷新才能执行]
容器里面还要一个滑动对象,设置它的position为absolute;
在initialize()函数里初始化一些属性。
在切换之前先执行Start()函数,进行相关设置,
主要是设置Index属性(索引)和_target属性(目标值):
复制代码 代码如下:
if(this.Index < 0){
this.Index = this._count - 1;
} else if (this.Index >= this._count){ this.Index = 0; }
this._target = -1 * this._parameter * this.Index;
接着就执行Move()函数开始移动了,原理通过设置滑动对象的top(或left)来做出移动的效果,
而减速的效果就需要执行GetStep()函数来获取步长:
复制代码 代码如下:
var iStep = (iTarget - iNow) / this.Step;用目标值减当前值再除以一个参数,得到步长,
这样取得的步长在当前值越接近目标值时会越来越小,也做成了减速的效果,
然后在top(或left)的设置中加上这个步长,并设置定时器继续Move(),直到到达目标值:
复制代码 代码如下:
this._slider.style[style] = (iNow + iStep) + "px";
this._timer = setTimeout(function(){ oThis.Move(); }, this.Time);
下面例子里的容器结构:
复制代码 代码如下:
<div class="container" id="idTransformView">
<ul class="slider" id="idSlider">
<li><img src="http://shundebk.cn/temp/https://img.qb5200.com/download-x/20200511/25840.jpg"/></li>
<li><img src="http://shundebk.cn/temp/https://img.qb5200.com/download-x/20200511/25841.jpg"/></li>
<li><img src="http://shundebk.cn/temp/https://img.qb5200.com/download-x/20200511/25842.gif"/></li>
</ul>
<ul class="num" id="idNum">
<li>1</li>
<li>2</li>
<li>3</li>
</ul>
</div>
要美观的话需要css设置一下:
复制代码 代码如下:
.container, .container *{margin:0; padding:0;}
.container{width:408px; height:168px; overflow:hidden;}
.slider{position:absolute;}
.slider li{ list-style:none;display:inline;}
.slider img{ width:408px; height:168px; display:block;}
.slider2{width:2000px;}
.slider2 li{float:left;}
.num{ position:absolute; right:5px; bottom:5px;}
.num li{
float: left;
color: #FF7300;
text-align: center;
line-height: 16px;
width: 16px;
height: 16px;
font-family: Arial;
font-size: 12px;
cursor: pointer;
overflow: hidden;
margin: 3px 1px;
border: 1px solid #FF7300;
background-color: #fff;
}
.num li.on{
color: #fff;
line-height: 21px;
width: 21px;
height: 21px;
font-size: 16px;
margin: 0 1px;
border: 0;
background-color: #FF7300;
font-weight: bold;
}
样式的设置跟程序也有一定关系,例如宽和高,这里就不说明了。
接着就可以实例化了:
复制代码 代码如下:
var tv = new TransformView ("idTransformView", "idSlider", 168, 3, {
onStart : function(){ Each(objs, function(o, i) { o.className = tv.Index == i ? "on" : ""; }) }//按钮样式
});
这里主要有4个参数,分别是容器对象、滑动对象、切换参数和切换数量。
当程序是上下切换时,切换参数切换的高度,当左右切换时,是切换的宽度。
切换数量就是有多少个切换对象了,例如上面的例子就是3个。
最后的参数是一些设置:
属性: 默认值//说明
Up: true,//是否向上(否则向左)
Step: 5,//滑动变化率
Time: 10,//滑动延时
Auto: true,//是否自动转换
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
例子里设置了onStart属性,作用是在切换开始时,设置按钮的样式
例子里完整的测试代码:
复制代码 代码如下:
function Each(list, fun){
for (var i = 0, len = list.length; i < len; i++) { fun(list[i], i); }
};
var objs = $("idNum").getElementsByTagName("li");
var tv = new TransformView("idTransformView", "idSlider", 168, 3, {
onStart : function(){ Each(objs, function(o, i) { o.className = tv.Index == i ? "on" : ""; }) }//按钮样式
});
tv.Start();
Each(objs, function (o, i){
o.onmouseover = function(){
o.className = "on";
tv.Auto = false;
tv.Index = i;
tv.Start();
}
o.onmouseout = function(){
o.className = "";
tv.Auto = true;
tv.Start();
}
})
源码:
复制代码 代码如下:
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;
}
var TransformView = Class.create();
TransformView.prototype = {
//容器对象,滑动对象,切换参数,切换数量
initialize: function(container, slider, parameter, count, options) {
if(parameter <= 0 || count <= 0) return;
var oContainer = $(container), oSlider = $(slider), oThis = this;
this.Index = 0;//当前索引
this._timer = null;//定时器
this._slider = oSlider;//滑动对象
this._parameter = parameter;//切换参数
this._count = count || 0;//切换数量
this._target = 0;//目标参数
this.SetOptions(options);
this.Up = !!this.options.Up;
this.Step = Math.abs(this.options.Step);
this.Time = Math.abs(this.options.Time);
this.Auto = !!this.options.Auto;
this.Pause = Math.abs(this.options.Pause);
this.onStart = this.options.onStart;
this.onFinish = this.options.onFinish;
oContainer.style.overflow = "hidden";
oContainer.style.position = "relative";
oSlider.style.position = "absolute";
oSlider.style.top = oSlider.style.left = 0;
},
//设置默认属性
SetOptions: function(options) {
this.options = {//默认值
Up: true,//是否向上(否则向左)
Step: 5,//滑动变化率
Time: 10,//滑动延时
Auto: true,//是否自动转换
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
};
Object.extend(this.options, options || {});
},
//开始切换设置
Start: function() {
if(this.Index < 0){
this.Index = this._count - 1;
} else if (this.Index >= this._count){ this.Index = 0; }
this._target = -1 * this._parameter * this.Index;
this.onStart();
this.Move();
},
//移动
Move: function() {
clearTimeout(this._timer);
var oThis = this, style = this.Up ? "top" : "left", iNow = parseInt(this._slider.style[style]) || 0, iStep = this.GetStep(this._target, iNow);
if (iStep != 0) {
this._slider.style[style] = (iNow + iStep) + "px";
this._timer = setTimeout(function(){ oThis.Move(); }, this.Time);
} else {
this._slider.style[style] = this._target + "px";
this.onFinish();
if (this.Auto) { this._timer = setTimeout(function(){ oThis.Index++; oThis.Start(); }, this.Pause); }
}
},
//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;
},
//停止
Stop: function(iTarget, iNow) {
clearTimeout(this._timer);
this._slider.style[this.Up ? "top" : "left"] = this._target + "px";
}
};
[Ctrl+A 全选 注:如需引入外部Js需刷新才能执行]
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