用javascript打造搜索工具栏

一:最终效果

二:原理

如果你在Yahoo中搜索“中国”，那么在浏览器的地址栏将得到这样一串地址：http://search.cn.yahoo.com/search?ei=gbk&fr=fp-tab-web-ycn&meta=vl%
3Dlang_zh-CN%26vl%3Dlang_zh-TW&pid=ysearch&source=ysearch_www_hp_button
&p=%D6%D0%B9%FA&Submit=
看上去有些乱了，简化一下：http://search.cn.yahoo.com/search?&p=%D6%D0%B9%FA
这就是关键.其中&p=%D6%D0%B9%FA是搜索的关键字参数，而%D6%D0%B9%FA是“中国”的
Url编码。OK，我们只要能构造出这样的编码就好了。

三：URL编码
JavaScript的encodeURIComponent()函数可以完成编码工作。
比如上面的例子我们可以用“http://search.cn.yahoo.com/search?&p=”＋encodeURIComponent(“中国”)；来完成。

四：代码
(点击加号展开）
复制代码代码如下:
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Search.aspx.cs" Inherits="Search" %>

<!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 runat="server">
<title>Search</title>
<script language="javascript" type="text/javascript">
// <!CDATA[

function GetEncodeOfKey()
{
var strKey = window.document.getElementById("Text_Key").value;
return encodeURIComponent(strKey);
}

function GetUrl(site)
{
var encode=GetEncodeOfKey();

     //web
     if(document.getElementById("RadioButtonList_Kind_0").checked)
     {
         if(site=="google")
         {
             return "http://www.google.com/search?q="+encode+"&ei=UTF-8";
         }
         else
         {
             return "http://search.yahoo.com/search?p="+encode+"&ei=UTF-8";
         }
     }
     //mp3
     else if(document.getElementById("RadioButtonList_Kind_1").checked)
     {
         if(site=="google")
         {
             return "http://www.google.com/search?q="+encode+" mp3"+"&ei=UTF-8";
         }
         else
         {
             return "http://audio.search.yahoo.com/search/audio?&p="+encode+"&ei=UTF-8";

         }
     }
     //img
     else if(document.getElementById("RadioButtonList_Kind_2").checked)
     {
         if(site=="google")
         {
             return "http://images.google.com/images?q="+encode+"&ei=UTF-8";
         }
         else
         {
             return "http://images.search.yahoo.com/search/images?p="+encode+"&ei=UTF-8";
         }
     }
     else
     {
         //alert("err");
     }

}

function Button_Google_onclick()
{
window.open(GetUrl("google"));
}

function Button_Yahoo_onclick()
{
window.open(GetUrl("yahoo"));
}

// ]]>
</script>
</head>
<body>
     <form id="form1" runat="server">
     <div>
         <br />
         <br />
         <strong><span style="font-size: 24pt; color: #336633">Search<br />
         </span></strong>
     </div>
     <hr style="position: relative" />
         <br />
         <table style="left: 0px; position: relative; top: 0px">
             <tr>
                 <td style="width: 31px; height: 21px">
                     <span style="font-family: Terminal">Key</span></td>
                 <td style="width: 253px; height: 21px">
                     <input id="Text_Key" style="width: 248px; position: relative" type="text" /></td>
                 <td style="width: 175px; height: 21px">
                     <asp:RadioButtonList ID="RadioButtonList_Kind" runat="server" RepeatDirection="Horizontal"
                         Style="position: relative" Font-Names="terminal">
                         <asp:ListItem Selected="True">Web</asp:ListItem>
                         <asp:ListItem>Mp3</asp:ListItem>
                         <asp:ListItem>Image</asp:ListItem>
                     </asp:RadioButtonList></td>
             </tr>
             <tr>
                 <td style="width: 31px">
                 </td>
                 <td colspan="2">
                     <input id="Button_Google" style="width: 80px; position: relative" type="button" value="Google" onclick="return Button_Google_onclick()" />

                     <input id="Button_Yahoo" style="left: -29px; width: 104px; position: relative" type="button"
                         value="Yahoo!" onclick="return Button_Yahoo_onclick()" /></td>
         </table>
         <br />
         <hr style="position: relative" />
         <asp:HyperLink ID="HyperLink_Home" runat="server" NavigateUrl="~/Default.aspx" Style="position: relative">Home</asp:HyperLink></form>
</body>
</html>