inputSuggest文本框输入时提示、自动完成效果(邮箱输入自动补全插件)

像QQ邮箱提示、百度的搜索框提示、淘宝的商品搜索提示等，现在有不少的网站都有类似效果，以提升用户体验。
　　使用方法：
　　new InputSuggest({
　　input HTMLInputElement 必选
　　data Array ['sina.cn','sina.com','2008.sina.com','vip.sina.com.cn'] 必选
　　containerCls 容器className
　　itemCls 容器子项className
　　activeCls 高亮子项className
　　width 宽度设置 此项将覆盖containerCls的width
　　opacity 透明度设置 此项将覆盖containerCls的opacity……
在线演示:http://demo.jb51.net/js/2012/inputSuggest/
完整源码下载：http://www.jb51.net/jiaoben/44737.html

inputSuggest输入字符时提示

body{margin:0;padding:0;}
input{width:200px;}
.suggest-container{border:1px solid #C1C1C1;visibility:hidden;}
.suggest-item{padding:3px 2px;}
.suggest-active {background:#33CCFF;color:white;padding:3px 2px;}

function InputSuggest(opt){
this.win = null;
this.doc = null;
this.container = null;
this.items = null;
this.input = opt.input || null;
this.containerCls = opt.containerCls || 'suggest-container';
this.itemCls = opt.itemCls || 'suggest-item';
this.activeCls = opt.activeCls || 'suggest-active';
this.width = opt.width;
this.opacity = opt.opacity;
this.data = opt.data || [];
this.active = null;
this.visible = false;
this.init();
}
InputSuggest.prototype = {
init: function(){
this.win = window;
this.doc = window.document;
this.container = this.$C('div');
this.attr(this.container, 'class', this.containerCls);
this.doc.body.appendChild(this.container);
this.setPos();
var _this = this, input = this.input;
this.on(input,'keyup',function(e){
if(input.value==''){
_this.hide();
}else{
_this.onKeyup(e);
}
});
// blur会在click前发生，这里使用mousedown
this.on(input,'blur',function(e){
_this.hide();
});
this.onMouseover();
this.onMousedown();
},
$C: function(tag){
return this.doc.createElement(tag);
},
getPos: function (el){
var pos=[0,0], a=el;
if(el.getBoundingClientRect){
var box = el.getBoundingClientRect();
pos=[box.left,box.top];
}else{
while(a && a.offsetParent){
pos[0] += a.offsetLeft;
pos[1] += a.offsetTop;
a = a.offsetParent
}
}
return pos;
},
setPos: function(){
var input = this.input,
pos = this.getPos(input),
brow = this.brow,
width = this.width,
opacity = this.opacity,
container = this.container;
container.style.cssText =
'position:absolute;overflow:hidden;left:'
+ pos[0] + 'px;top:'
+ (pos[1]+input.offsetHeight) + 'px;width:'
// IE6/7/8/9/Chrome/Safari input[type=text] border默认为2，Firefox为1，因此取offsetWidth-2保证与FF一致
+ (brow.firefox ? input.clientWidth : input.offsetWidth-2) + 'px;';
if(width){
container.style.width = width + 'px';
}
if(opacity){
if(this.brow.ie){
container.style.filter = 'Alpha(Opacity=' + opacity * 100 + ');';
}else{
container.style.opacity = (opacity == 1 ? '' : '' + opacity);
}
}
},
show: function(){
this.container.style.visibility = 'visible';
this.visible = true;
},
hide: function(){
this.container.style.visibility = 'hidden';
this.visible = false;
},
attr: function(el, name, val){
if(val === undefined){
return el.getAttribute(name);
}else{
el.setAttribute(name,val);
name=='class' && (el.className = val);
}
},
on: function(el, type, fn){
el.addEventListener ? el.addEventListener(type, fn, false) : el.attachEvent('on' + type, fn);
},
un: function(el, type, fn){
el.removeEventListener ? el.removeEventListener(type, fn, false) : el.detachEvent('on' + type, fn);
},
brow: function(ua){
return {
ie: /msie/.test(ua) && !/opera/.test(ua),
opera: /opera/.test(ua),
firefox: /firefox/.test(ua)
};
}(navigator.userAgent.toLowerCase()),
onKeyup: function(e){
var container = this.container, input = this.input, iCls = this.itemCls, aCls = this.activeCls;
if(this.visible){
switch(e.keyCode){
case 13: // Enter
if(this.active){
input.value = this.active.firstChild.data;
this.hide();
}
return;
case 38: // 方向键上
if(this.active==null){
this.active = container.lastChild;
this.attr(this.active, 'class', aCls);
input.value = this.active.firstChild.data;
}else{
if(this.active.previousSibling!=null){
this.attr(this.active, 'class', iCls);
this.active = this.active.previousSibling;
this.attr(this.active, 'class', aCls);
input.value = this.active.firstChild.data;
}else{
this.attr(this.active, 'class', iCls);
this.active = null;
input.focus();
input.value = input.getAttribute("curr_val");
}
}
return;
case 40: // 方向键下
if(this.active==null){
this.active = container.firstChild;
this.attr(this.active, 'class', aCls);
input.value = this.active.firstChild.data;
}else{
if(this.active.nextSibling!=null){
this.attr(this.active, 'class', iCls);
this.active = this.active.nextSibling;
this.attr(this.active, 'class', aCls);
input.value = this.active.firstChild.data;
}else{
this.attr(this.active, 'class', iCls);
this.active = null;
input.focus();
input.value = input.getAttribute("curr_val");
}
}
return;
}
// 烈火網 liehｕｏ．ｎｅt 欢迎复制,拒绝恶意采集 ｖｅｒｙｈｕｏ．ＣＯｍ
}
if(e.keyCode==27){ // ESC键
this.hide();
input.value = this.attr(input,'curr_val');
return;
}
if(input.value.indexOf('@')!=-1){return;}
this.items = [];
if(this.attr(input,'curr_val')!=input.value){
this.container.innerHTML = '';
for(var i=0,len=this.data.length;i

window.onload = function(){
var sinaSuggest = new InputSuggest({
input: document.getElementById('sina'),
data: ['sina.cn','sina.com','vip.sina.com.cn','2008.sina.com','263.sina.com']
});
var sohuSuggest = new InputSuggest({
width: 300,
opacity: 0.3,
input: document.getElementById('sohu'),
data: ['sohu.com','sogou.com','chinaren.com','vip.sohu.com','sohu.net','2008.sohu.com','sms.sohu.com']
});
}

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