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carousel.js
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carousel.js
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window.Carousel = (function() {
// 定义Carousel对象
var Carousel = {},
carousel = null,
left = null,
right = null,
item = null,
li_list = null,
item_active_index = -1,
item_next_index = -1,
item_prev_index = -1,
li_active = null,
li_next = null,
li_prev = null;
// I.定义一个TimerManager类
// 1）构造函数
function TimerManager() {
this.timers = []; // 保存定时器
this.args = []; // 保存定时器的参数
this.isFiring = false;
}
// 2）静态方法：为element添加一个TimerManager实例
TimerManager.makeInstance = function(element) {
// 如果element.__TimerManager__上没有TimerManager，就为其添加一个
if (!element.__TimerManager__ || element.__TimerManager__.constructor != TimerManager) {
element.__TimerManager__ = new TimerManager();
}
};
// 3）扩展TimerManager原型，分别实现add，fire，next方法
TimerManager.prototype.add = function(timer, args) {
this.timers.push(timer);
this.args.push(args);
this.fire();
};
TimerManager.prototype.fire = function() {
if ( !this.isFiring ) {
var timer = this.timers.shift(), // 取出定时器
args = this.args.shift(); // 取出定时器参数
if (timer && args) {
this.isFiring = true;
// 传入参数，执行定时器函数
timer(args[0], args[1],args[2]);
}
}
};
TimerManager.prototype.next = function() {
this.isFiring = false;
this.fire();
};
// 定义左右移动函数
function slideLeft (ele,left,callback){
var current_left = ele.offsetLeft,
width = ele.offsetWidth,
incream = width/(500/10);
setLeft(current_left);
function setLeft(current_left){
var timer = setTimeout(function(){
current_left -=incream;
ele.style.left = current_left+'px';
clearInterval(timer);
if(-current_left>=-left){
callback();
if (ele.__TimerManager__ && ele.__TimerManager__.constructor == TimerManager) {
ele.__TimerManager__.next();
}
} else {
setLeft(current_left);
}
},10);
}
}
function slideRight (ele,left,callback){
var current_left = ele.offsetLeft,
width = ele.offsetWidth,
incream = width/(500/10);
setLeft(current_left);
function setLeft(current_left){
var timer = setTimeout(function(){
current_left +=incream;
ele.style.left = current_left+'px';
clearInterval(timer);
if(current_left>=left){
callback();
if (ele.__TimerManager__ && ele.__TimerManager__.constructor == TimerManager) {
ele.__TimerManager__.next();
}
} else {
setLeft(current_left);
}
},10);
}
}
Carousel.prev = function(type,prev){
if(type=='direction'){
item_prev_index = item_active_index>0?item_active_index-1:0;
} else if(type=='mouseover'){
item_prev_index = prev;
}
addClass(item[item_prev_index],'prev');
li_active = li_list[item_active_index];
li_prev = li_list[item_prev_index];
item[item_active_index].offsetWidth;
}
Carousel.next = function(type,next){
if(type=='direction'){
item_next_index = item_active_index<item.length?item_active_index+1:item_active_index;
} else if(type=='mouseover'){
item_next_index = next;
}
addClass(item[item_next_index],'next');
li_active = li_list[item_active_index];
li_next = li_list[item_next_index];
item[item_active_index].offsetWidth;
}
// III.定义外部访问接口
Carousel.swiper = function(id) {
carousel = document.getElementById(id);
left = carousel.querySelectorAll('.left')[0];
right = carousel.querySelectorAll('.right')[0];
item = carousel.querySelectorAll('.item');
li_list = document.querySelectorAll('.btn-dot .li');
for(var i=0;i<item.length;i++){
var ele = item[i];
if(hasClass(ele,'active')){
item_active_index = i;
}
}
var that = this;
addEvent(left,'click',function(e){
that.prev('direction');
var active = item[item_active_index],
prev = item[item_prev_index];
TimerManager.makeInstance(active);
active.__TimerManager__.add(slideRight, [active,active.offsetWidth,function(){
}]);
TimerManager.makeInstance(prev);
prev.__TimerManager__.add(slideRight, [prev,0,function(){
removeClass(active,'active');
removeClass(li_active,'active');
item_active_index = item_prev_index;
addClass(prev,'active');
addClass(li_prev,'active');
removeClass(prev,'prev');
}]);
})
addEvent(right,'click',function(e){
that.next('direction');
var active = item[item_active_index],
next = item[item_next_index];
TimerManager.makeInstance(active);
active.__TimerManager__.add(slideLeft, [active,-active.offsetWidth,function(){
}]);
TimerManager.makeInstance(next);
next.__TimerManager__.add(slideLeft, [next,0,function(){
removeClass(active,'active');
removeClass(li_active,'active');
item_active_index = item_next_index;
addClass(next,'active');
addClass(li_next,'active');
removeClass(next,'next');
}]);
})
for(var i=0;i<li_list.length;i++){
var li = li_list[i];
test(i);
function test(i){
addEvent(li,'click',function(){
if(i>item_active_index&&i<item.length){
that.next('mouseover',i);
var active = item[item_active_index],
next = item[item_next_index];
TimerManager.makeInstance(active);
active.__TimerManager__.add(slideLeft, [active,-active.offsetWidth,function(){
}]);
TimerManager.makeInstance(next);
next.__TimerManager__.add(slideLeft, [next,0,function(){
removeClass(active,'active');
removeClass(li_active,'active');
item_active_index = item_next_index;
addClass(next,'active');
addClass(li_next,'active');
removeClass(next,'next');
}]);
} else if(i>=0&&i<item_active_index){
that.prev('mouseover',i);
var active = item[item_active_index],
prev = item[item_prev_index];
TimerManager.makeInstance(active);
active.__TimerManager__.add(slideRight, [active,active.offsetWidth,function(){
}]);
TimerManager.makeInstance(prev);
prev.__TimerManager__.add(slideRight, [prev,0,function(){
removeClass(active,'active');
removeClass(li_active,'active');
item_active_index = item_prev_index;
addClass(prev,'active');
addClass(li_prev,'active');
removeClass(prev,'prev');
}]);
}
})
}
}
return this;
};
// 返回Carousel对象
return Carousel;
})();