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Implementing the automatic matching function of Baidu-like input box based on javascript_javascript skills

WBOY
WBOYOriginal
2016-05-16 15:22:181603browse

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:1px solid #555; 
} 
.des { 
width:500px; 
background-color:lightyellow; 
border:1px solid #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> 
<SCRIPT LANGUAGE="JavaScript"> 
<!-- 
function jsAuto(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"; 
return this; 
};

jsAuto.prototype.directionKey=function() { with (this)
{
var e = _e.keyCode &#63; _e.keyCode : _e.which;
var l = _o.childNodes.length;
(_c>l-1 || _c<0) &#63; _s=false : "";

if( e==40 && _s )
{
_o.childNodes[_c].className="mouseout";
(_c >= l-1) &#63; _c=0 : _c ++;
_o.childNodes[_c].className="mouseover";
}
if( e==38 && _s )
{
_o.childNodes[_c].className="mouseout";
_c--<=0 &#63; _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" &#63; obj.className="mouseover" : obj.parentElement.className="mouseover";
}};
jsAuto.prototype.domouseout=function(obj)
{
obj.tagName=="DIV" &#63; 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("javascript autocomplete ERROR :\n\n can not get return object.");
return;
}
}};

// object method;
jsAuto.prototype.item=function(msg)
{
if( msg.indexOf(",")>0 )
{
var arrMsg=msg.split(",");
for(var i=0; i<arrMsg.length; i++)
{
arrMsg[i] &#63; this._msg.push(arrMsg[i]) : "";
}
}
else
{
this._msg.push(msg);
}
this._msg.sort();
};
jsAuto.prototype.append=function(msg) { with (this)
{
_i &#63; "" : _i = eval(_i);
_x.push(msg);
var div = document.createElement("DIV");
//bind event to object.
div.onmouseover = function(){_i.domouseover(this)};
div.onmouseout = function(){_i.domouseout(this)};
div.onclick = function(){_i.doclick(msg)};
var re = new RegExp("(" + _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)
{
var re;
_e = event;
var e = _e.keyCode &#63; _e.keyCode : _e.which;
_x = [];
_f = false;
_r = document.getElementById( fID );
_v = fValue;
_i = eval(_i);
re = new RegExp("^" + fValue + "", "i");
_o.innerHTML="";

for(var i=0; i<_msg.length; i++)
{
if(re.test(_msg[i]))
{
_i.append(_msg[i]);
_f = true;
}
}

_i &#63; _i.display() : alert("can not get instance");

if(_f)
{
if((e==38 || e==40 || e==13))
{
_i.directionKey();
}
else
{
_c=0;
_o.childNodes[_c].className = "mouseover";
_s=true;
}
}
}};
window.onerror=new Function("return true;");
//-->
</SCRIPT>
</HEAD>

<BODY>
<div id="divc">
<!--this is the autocomplete container.-->
</div>
<div align="center">
<input onkeyup="jsAutoInstance.handleEvent(this.value,'auto',event)" id="auto">
</div>

<SCRIPT LANGUAGE="JavaScript">
<!--
var jsAutoInstance = new jsAuto("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。

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