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用js实现输入提示（自动完成）

2011-03-01 09:56 676 查看
完成有以下功能：

输入字符会把以输入字符开头的提示出来。

支持上下方向键选择提示选项，支持循环

支持绑定一个数组提示，支持ajax传递输入框值请求数据。

支持多个选择的dom元素一块绑定数据实现输入提示。各dom元素也可以单独绑定自己的数据实现输入提示，互不影响。

支持中文。
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>autoComplete</title>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<mce:style type="text/css"><!--
.autoComplete {margin:8px;position:relative;float:left;}
.autoComplete input {width:200px;height:25px;margin:0;padding:0;line-height:25px;}
.autoComplete ul {z-index:-12;padding:0px;margin:0px;border:1px #333 solid;width:200px;background:white;display:none;position:absolute;left:0;top:28px;*margin-left:9px;*margin-top:2px;margin-top:1px/0;}
.autoComplete li {list-style:none;}
.autoComplete li a {display:block;color:#000;text-decoration:none;padding:1px 0 1px 5px;_width:97%;}
.autoComplete li a:hover {color:#000;background:#ccc;border:none;}
--></mce:style><style type="text/css" mce_bogus="1">.autoComplete {margin:8px;position:relative;float:left;}
.autoComplete input {width:200px;height:25px;margin:0;padding:0;line-height:25px;}
.autoComplete ul {z-index:-12;padding:0px;margin:0px;border:1px #333 solid;width:200px;background:white;display:none;position:absolute;left:0;top:28px;*margin-left:9px;*margin-top:2px;margin-top:1px/0;}
.autoComplete li {list-style:none;}
.autoComplete li a {display:block;color:#000;text-decoration:none;padding:1px 0 1px 5px;_width:97%;}
.autoComplete li a:hover {color:#000;background:#ccc;border:none;}</style>
<mce:script type="text/javascript"><!--
var getElementsByClassName = function (searchClass, node, tag) {/* 兼容各浏览器的选择class的方法；(写法参考了博客园：http://www.cnblogs.com/rubylouvre/archive/2009/07/24/1529640.html，想了解更多请看这个地址) */
node = node || document, tag = tag ? tag.toUpperCase() : "*";
if(document.getElementsByClassName){/* 支持getElementsByClassName的浏览器 */
var temp = node.getElementsByClassName(searchClass);
if(tag=="*"){
return temp;
} else {
var ret = new Array();
for(var i=0; i<temp.length; i++)
if(temp[i].nodeName==tag)
ret.push(temp[i]);
return ret;
}
}else{/* 不支持getElementsByClassName的浏览器 */
var classes = searchClass.split(" "),
elements = (tag === "*" && node.all)? node.all : node.getElementsByTagName(tag),
patterns = [], returnElements = [], current, match;
var i = classes.length;
while(--i >= 0)
patterns.push(new RegExp("(^|//s)" + classes[i] + "(//s|$)"));
var j = elements.length;
while(--j >= 0){
current = elements[j], match = false;
for(var k=0, kl=patterns.length; k<kl; k++){
match = patterns[k].test(current.className);
if(!match) break;
}
if(match) returnElements.push(current);
}
return returnElements;
}
};
var addEvent=(function(){/* 用此函数添加事件防止事件覆盖 */
if(document.addEventListener){
return function(type, fn){ this.addEventListener(type, fn, false); };
}else if(document.attachEvent){
return function(type,fn){
this.attachEvent('on'+type, function () {
return fn.call(this, window.event);/* 兼容IE */
});
};
}
})();
;(function(window){
/* 插件开始 */
var autoComplete=function(o){
var handler=(function(){
var handler=function(e,o){ return new handler.prototype.init(e,o); };/* 为每个选择的dom都创建一个相对应的对象，这样选择多个dom时可以很方便地使用 */
handler.prototype={
e:null, o:null, timer:null, show:0, input:null, popup:null,
init:function(e,o){/* 设置初始对象 */
this.e=e, this.o=o,
this.input=this.e.getElementsByTagName(this.o.input)[0],
this.popup=this.e.getElementsByTagName(this.o.popup)[0],
this.initEvent();/* 初始化各种事件 */
},
match:function(quickExpr,value,source){/* 生成提示 */
var li = null;
for(var i in source){
if( value.length>0 && quickExpr.exec(source[i])!=null ){
li = document.createElement('li');
li.innerHTML = '<a href="javascript:;" mce_href="javascript:;">'+source[i]+'</a>';
this.popup.appendChild(li);
}
}
if(this.popup.getElementsByTagName('a').length)
this.popup.style.display='block';
else
this.popup.style.display='none';
},
ajax:function(type,url,quickExpr,search){/* ajax请求远程数据 */
var xhr = window.ActiveXObject ? new ActiveXObject("Microsoft.XMLHTTP") : new XMLHttpRequest();
xhr.open(type,url,true);/* 同异步在此修改 */
xhr.setRequestHeader("Content-Type","application/x-www-form-urlencoded");
var that=this;
xhr.onreadystatechange = function(){
if(xhr.readyState==4) {
if(xhr.status==200) {
var data = eval(xhr.responseText);
that.match(quickExpr,search,data);/* 相同于成功的回调函数 */
}else{
alert("请求页面异常!");/* 请求失败 */
}
}
};
xhr.send(null);
},
fetch:function(ajax,search,quickExpr){
var that=this;
this.ajax(ajax.type,ajax.url+search,quickExpr,search);
},
initEvent:function(){/* 各事件的集合 */
var that=this;
this.input.onfocus = function(){
if(this.inputValue) this.value = this.inputValue;
var value=this.value, quickExpr=RegExp('^'+value,'i'), self=this;
var els = that.popup.getElementsByTagName('a');
if(els.length>0) that.popup.style.display = 'block';
that.timer=setInterval(function(){
if(value!=self.value){/* 判断输入内容是否改变，兼容中文 */
value=self.value;
that.popup.innerHTML='';
if(value!=''){
quickExpr=RegExp('^'+value);
if(that.o.source) that.match(quickExpr,value,that.o.source);
else if(that.o.ajax) that.fetch(that.o.ajax,value,quickExpr);
}
}
},200);
};
this.input.onblur = function(){/*  输入框添加事件 */
if(this.value!=this.defaultValue) this.inputValue = this.value;
clearInterval(that.timer);
var current=-1;/* 记住当前有焦点的选项 */
var els = that.popup.getElementsByTagName('a');
var len = els.length-1;
var aClick = function(){
that.input.inputValue = this.firstChild.nodeValue;
that.popup.innerHTML='';
that.popup.style.display='none';
that.input.focus();
};
var aFocus = function(){
for(var i=len; i>=0; i--){
if(this.parentNode===that.popup.children[i]){
current = i;
break;
}
}
//that.input.value = this.firstChild.nodeValue;
for(var k in that.o.elemCSS.focus){
this.style[k] = that.o.elemCSS.focus[k];
}
};
var aBlur= function(){
for(var k in that.o.elemCSS.blur)
this.style[k] = that.o.elemCSS.blur[k];
};
var aKeydown = function(event){
event = event || window.event;/* 兼容IE */
if(current === len && event.keyCode===9){/* tab键时popup隐藏 */
that.popup.style.display = 'none';
}else if(event.keyCode==40){/* 处理上下方向键事件方便选择提示的选项 */
current++;
if(current<-1) current=len;
if(current>len){
current=-1;
that.input.focus();
}else{
that.popup.getElementsByTagName('a')[current].focus();
}
}else if(event.keyCode==38){
current--;
if(current==-1){
that.input.focus();
}else if(current<-1){
current = len;
that.popup.getElementsByTagName('a')[current].focus();
}else{
that.popup.getElementsByTagName('a')[current].focus();
}
}
};
for(var i=0; i<els.length; i++){/* 为每个选项添加事件 */
els[i].onclick = aClick;
els[i].onfocus = aFocus;
els[i].onblur = aBlur;
els[i].onkeydown = aKeydown;
}
};
this.input.onkeydown = function(event){
event = event || window.event;/* 兼容IE */
var els = that.popup.getElementsByTagName('a');
if(event.keyCode==40){
if(els[0]) els[0].focus();
}else if(event.keyCode==38){
if(els[els.length-1]) els[els.length-1].focus();
}else if(event.keyCode==9){
if(event.shiftKey==true) that.popup.style.display = 'none';
}
};
this.e.onmouseover = function(){ that.show=1; };
this.e.onmouseout = function(){ that.show=0; };
addEvent.call(document,'click',function(){
if(that.show==0){
that.popup.style.display='none';
}
});/* 处理提示框dom元素不支持onblur的情况 */
}
};
handler.prototype.init.prototype=handler.prototype;/* JQuery style，这样我们在处的时候就不用每个dom元素都用new来创建对象了 */
return handler;/* 把内部的处理函数传到外部 */
})();
if(this.length){/* 处理选择多个dom元素 */
for(var a=this.length-1; a>=0; a--){/* 调用方法为每个选择的dom生成一个处理对象，使它们不互相影响 */
handler(this[a],o);
}
}else{/* 处理选择一个dom元素 */
handler(this,o);
}
return this;
};
return window.autoComplete = autoComplete;/* 暴露方法给全局对象 */
/* 插件结束 */
})(window);
/* 调用 */
addEvent.call(null,'load',function(){
autoComplete.call( getElementsByClassName('autoComplete'), {/* 使用call或apply调用此方法 */
source:['0123','023',123,1234,212,214,'033333','0352342',1987,17563,20932],/* 提示时在此数组中搜索 */
//ajax:{ type:'post',url:'./php/fetch.php?search=' },/* 如果使用ajax则远程返回的数据格式要与source相同 */
elemCSS:{ focus:{'color':'black','background':'#ccc'}, blur:{'color':'black','background':'transparent'} },/* 些对象中的key要js对象中的style属性支持 */
input:'input',/* 输入框使用input元素 */
popup:'ul'/* 提示框使用ul元素 */
});
});
// --></mce:script>
</head>
<body><!-- 这所以使用这么多的z-index是因为ie6和ie7的问题 -->
<div>
<div class="autoComplete" style="z-index:19" mce_style="z-index:19"> <input value="input" /> <ul><li></li></ul> </div>
<div class="autoComplete" style="z-index:18" mce_style="z-index:18"> <input value="input" /> <ul><li></li></ul> </div>
<div class="autoComplete" style="z-index:17" mce_style="z-index:17"> <input value="input" /> <ul><li></li></ul> </div>
<div class="autoComplete" style="z-index:16" mce_style="z-index:16"> <input value="input" /> <ul><li></li></ul> </div>
<div class="autoComplete" style="z-index:15" mce_style="z-index:15"> <input value="input" /> <ul><li></li></ul> </div>
<div class="autoComplete" style="z-index:14" mce_style="z-index:14"> <input value="input" /> <ul><li></li></ul> </div>
<div class="autoComplete" style="z-index:13" mce_style="z-index:13"> <input value="input" /> <ul><li></li></ul> </div>
<div class="autoComplete" style="z-index:12" mce_style="z-index:12"> <input value="input" /> <ul><li></li></ul> </div>
<div class="autoComplete" style="z-index:11" mce_style="z-index:11"> <input value="input" /> <ul><li></li></ul> </div>
<div class="autoComplete" style="z-index:10" mce_style="z-index:10"> <input value="input" /> <ul><li></li></ul> </div>
<div class="autoComplete" style="z-index:9" mce_style="z-index:9"> <input value="input" /> <ul><li></li></ul> </div>
<div class="autoComplete" style="z-index:8" mce_style="z-index:8"> <input value="input" /> <ul><li></li></ul> </div>
<div class="autoComplete" style="z-index:7" mce_style="z-index:7"> <input value="input" /> <ul><li></li></ul> </div>
<div class="autoComplete" style="z-index:6" mce_style="z-index:6"> <input value="input" /> <ul><li></li></ul> </div>
<div class="autoComplete" style="z-index:5" mce_style="z-index:5"> <input value="input" /> <ul><li></li></ul> </div>
<div class="autoComplete" style="z-index:4" mce_style="z-index:4"> <input value="input" /> <ul><li></li></ul> </div>
<div class="autoComplete" style="z-index:3" mce_style="z-index:3"> <input value="input" /> <ul><li></li></ul> </div>
<div class="autoComplete" style="z-index:2" mce_style="z-index:2"> <input value="input" /> <ul><li></li></ul> </div>
<div class="autoComplete" style="z-index:1" mce_style="z-index:1"> <input value="input" /> <ul><li></li></ul> </div>
<div class="autoComplete" style="z-index:0" mce_style="z-index:0"> <input value="input" /> <ul><li></li></ul> </div>
<div style="clear:both;" mce_style="clear:both;"></div>
</div>
<div style="border:3px red double;margin:15px;padding:5px;" mce_style="border:3px red double;margin:15px;padding:5px;">
<h3 style="line-height:10px;" mce_style="line-height:10px;">Tip:</h3>
<ul>
<li>输入0、1，2会得到提示。</li>
<li>用鼠标或上下键可以选择提示。</li>
<li>选择点击鼠标或点回车可以选择选项。</li>
<li>可以修改调用处，使各个输入框提示不同内容。</li>
</ul>
</div>
</body>
</html>
出自博客园:http://www.cnblogs.com/jaiho/archive/2011/02/28/js_autoComplete.html
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