基于javascript实现仿百度输入框自动匹配功能
本文实例讲解了基于javascript实现仿百度输入框自动匹配功能的详细代码，现在很多网站都有这种效果，在文本框输入一个字符，下边会出来相匹配的内容，这个代码就演示了这个功能是如何完成的，当然，这是个静态的，你可以将提示的内容从数据库读取出来，要用到AJAX那东东，分享给大家供大家参考，具体内容如下
<HTML>
<HEAD>
<title>带输入匹配的文本框</title>
<style>
body,div{
font-family:verdana;
line-height:100%;
font-size:10pt;
}
input{
width:320px;
}
h1{
text-align:center;
font-size:2.2em;
}
#divc{
border:1pxsolid#555;
}
.des{
width:500px;
background-color:lightyellow;
border:1pxsolid#555;
padding:25px;
margin-top:25px;
}
.mouseover{
color:#ffffff;
background-color:highlight;
width:100%;
cursor:default;
}
.mouseout{
color:#000;
width:100%;
background-color:#ffffff;
cursor:default;
}
</style>
<SCRIPTLANGUAGE="JavaScript">
<!--
functionjsAuto(instanceName,objID)
{
this._msg=[];
this._x=null;
this._o=document.getElementById(objID);
if(!this._o)return;
this._f=null;
this._i=instanceName;
this._r=null;
this._c=0;
this._s=false;
this._v=null;
this._o.style.visibility="hidden";
this._o.style.position="absolute";
this._o.style.zIndex="9999";
this._o.style.overflow="auto";
this._o.style.height="50";
returnthis;
};
jsAuto.prototype.directionKey=function(){with(this)
{
vare=_e.keyCode?_e.keyCode:_e.which;
varl=_o.childNodes.length;
(_c>l-1||_c<0)?_s=false:"";
if(e==40&&_s)
{
_o.childNodes[_c].className="mouseout";
(_c>=l-1)?_c=0:_c++;
_o.childNodes[_c].className="mouseover";
}
if(e==38&&_s)
{
_o.childNodes[_c].className="mouseout";
_c--<=0?_c=_o.childNodes.length-1:"";
_o.childNodes[_c].className="mouseover";
}
if(e==13)
{
if(_o.childNodes[_c]&&_o.style.visibility=="visible")
{
_r.value=_x[_c];
_o.style.visibility="hidden";
}
}
if(!_s)
{
_c=0;
_o.childNodes[_c].className="mouseover";
_s=true;
}
}};
//mouseEvent.
jsAuto.prototype.domouseover=function(obj){with(this)
{
_o.childNodes[_c].className="mouseout";
_c=0;
obj.tagName=="DIV"?obj.className="mouseover":obj.parentElement.className="mouseover";
}};
jsAuto.prototype.domouseout=function(obj)
{
obj.tagName=="DIV"?obj.className="mouseout":obj.parentElement.className="mouseout";
};
jsAuto.prototype.doclick=function(msg){with(this)
{
if(_r)
{
_r.value=msg;
_o.style.visibility="hidden";
}
else
{
alert("javascriptautocompleteERROR:\n\ncannotgetreturnobject.");
return;
}
}};
//objectmethod;
jsAuto.prototype.item=function(msg)
{
if(msg.indexOf(",")>0)
{
vararrMsg=msg.split(",");
for(vari=0;i<arrMsg.length;i++)
{
arrMsg[i]?this._msg.push(arrMsg[i]):"";
}
}
else
{
this._msg.push(msg);
}
this._msg.sort();
};
jsAuto.prototype.append=function(msg){with(this)
{
_i?"":_i=eval(_i);
_x.push(msg);
vardiv=document.createElement("DIV");
//bindeventtoobject.
div.onmouseover=function(){_i.domouseover(this)};
div.onmouseout=function(){_i.domouseout(this)};
div.onclick=function(){_i.doclick(msg)};
varre=newRegExp("("+_v+")","i");
div.style.lineHeight="140%";
div.className="mouseout";
if(_v)div.innerHTML=msg.replace(re,"<strong>$1</strong>");
div.style.fontFamily="verdana";
_o.appendChild(div);
}};
jsAuto.prototype.display=function(){with(this)
{
if(_f&&_v!="")
{
_o.style.left=_r.offsetLeft;
_o.style.width=_r.offsetWidth;
_o.style.top=_r.offsetTop+_r.offsetHeight;
_o.style.visibility="visible";
}
else
{
_o.style.visibility="hidden";
}
}};
jsAuto.prototype.handleEvent=function(fValue,fID,event){with(this)
{
varre;
_e=event;
vare=_e.keyCode?_e.keyCode:_e.which;
_x=[];
_f=false;
_r=document.getElementById(fID);
_v=fValue;
_i=eval(_i);
re=newRegExp("^"+fValue+"","i");
_o.innerHTML="";
for(vari=0;i<_msg.length;i++)
{
if(re.test(_msg[i]))
{
_i.append(_msg[i]);
_f=true;
}
}
_i?_i.display():alert("cannotgetinstance");
if(_f)
{
if((e==38||e==40||e==13))
{
_i.directionKey();
}
else
{
_c=0;
_o.childNodes[_c].className="mouseover";
_s=true;
}
}
}};
window.onerror=newFunction("returntrue;");
//-->
</SCRIPT>
</HEAD>
<BODY>
<divid="divc">
<!--thisistheautocompletecontainer.-->
</div>
<divalign="center">
<inputonkeyup="jsAutoInstance.handleEvent(this.value,'auto',event)"id="auto">
</div>
<SCRIPTLANGUAGE="JavaScript">
<!--
varjsAutoInstance=newjsAuto("jsAutoInstance","divc");
jsAutoInstance.item("a-start,b-start,c-start,d-start,e-start,f-start,g-start,h-start,i-start,j-start,k-start,l-start,m-start,n-start,o-start,p-start,q-start,r-start,s-start,t-start,u-start,v-start,w-start,x-start,y-start,z-start,z-start,a-start,b-start,c-start,d-start,e-start,f-start,g-start,h-start,i-start,j-start,k-start,l-start,m-start,n-start,o-start,p-start,q-start,r-start,s-start,t-start,u-start,v-start,w-start,x-start,y-start,z-start,u-start,v-start,w-start,x-start,y-start,z-start,z-start,a-start,b-start,c-start,y-start,z-start,z-start,a-start,b-start,c-start,d-start,e-start,f-start,g-start,h-start,i-start,s-start,w-start,x-start,y-start,z-start,z-start,a-start,b-start,c-start,d-start,e-start,f-start,g-start,h-start,i-start,a-start,b-start,c-start,d-start,e-start,z-start,z-start");
jsAutoInstance.item("blueDestiny");
jsAutoInstance.item("BlueMiracle,Blue");
jsAutoInstance.item("angela,geniuslau");
jsAutoInstance.item("never-online");
//-->
</SCRIPT>
<center>请在输入框输入一个字母：</center>
</BODY>
</HTML>
希望本文所述对大家学习javascript程序设计有所帮助。