var Hongru={};
function H$(id){return document.getElementById(id)}
function H$$(c,p){return p.getElementsByTagName(c)}
Hongru.fader = function(){
function init(anchor,options){
this.anchor = anchor;
var wp = H$(options.id),
ul = H$$('ul',wp)[0],
li = this.li = H$$('li',ul);
this.index = options.position?options.position:0;
this.a = options.auto?options.auto:2;
this.cur = this.z = 0;
this.l = li.length;
this.img = [];
for(var k=0;k<this.l;k++){
this.img.push(H$$('img',this.li[k])[0]);
}
this.curC = options.curNavClass?options.curNavClass:'fader-cur-nav';
nav_wp = document.createElement('div');
nav_wp.id = 'fader-nav';
nav_wp.style.cssText = 'position:absolute;right:0;bottom:0;height:22px;';
var alt = this.alt = document.createElement('p');
for(var i=0;i<this.l;i++){
this.li[i].o = 100;
//setOpacity(this.li[i],this.li.o);
this.li[i].style.opacity = this.li[i].o/100;
this.li[i].style.filter = 'alpha(opacity='+this.li[i].o+')';
//绘制控制器
var nav = document.createElement('a');
nav.className = options.navClass?options.navClass:'fader-nav';
nav.innerHTML = i+1;
nav.onclick = new Function(this.anchor+'.pos('+i+')');
nav_wp.appendChild(nav);
}
wp.appendChild(alt);
wp.appendChild(nav_wp);
this.textH = nav_wp.offsetHeight;
alt.style.cssText = '';
alt.style.height = alt.style.lineHeight = this.textH+'px';
this.pos(this.index);
}
init.prototype={
auto:function(){
this.li.a = setInterval(new Function(this.anchor+'.move(1)'),this.a*1000);
},
move:function(i){
var n = this.cur+i;
var m = i==1?n==this.l?0:n:n<0?this.l-1:n;
this.pos(m);
},
pos:function(i){
clearInterval(this.li.a);
clearInterval(this.li[i].f);
var curLi = this.li[i];
this.z++;
curLi.style.zIndex = this.z;
this.alt.style.zIndex = this.z+1;
nav_wp.style.zIndex = this.z+2;
this.li.a=false; //这句话是必要的
this.cur = i;
//setOpacity(curLi[i],0);
if(this.li[i].o>=100){
this.li[i].o = 0;
curLi.style.opacity = 0;
curLi.style.filter = 'alpha(opacity=0)';
this.alt.style.height = '0px';
}
for(var x=0;x<this.l;x++){
nav_wp.getElementsByTagName('a')[x].className = x==i?this.curC:'fader-nav';
}
this.alt.innerHTML = this.img[i].alt;
this.li[i].f = setInterval(new Function(this.anchor+'.fade('+i+')'),20);
},
fade:function(i){
var p=this.li[i];
if(p.o>=100){
clearInterval(p.f);
if(!this.li.a){ //一定要在这里做个是否已经clearInterval的判断，要不然在快速点击的时候会导致图片不停地闪
this.auto();
}
}
else{
p.o+=5;
//setOpacity(this.li[i],this.li[i].o);
p.style.opacity = p.o/100;
p.style.filter = 'alpha(opacity='+p.o+')';
this.alt.style.height = Math.ceil(p.o*this.textH/100)+'px';
}
}
};
return {init:init};
}();