用JavaScript打造搜索工具栏

电子科技大学软件学院03级2班周银辉

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）

1 <%@ Page Language="C#" AutoEventWireup="true" CodeFile="Search.aspx.cs" Inherits="Search" %>
2
3 <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
4
5 <html xmlns="http://www.w3.org/1999/xhtml" >
6 <head runat="server">
7     <title>Search</title>
8 <script language="javascript" type="text/javascript">
9 // <!CDATA[
10
11 function GetEncodeOfKey()
12 {
13     var strKey = window.document.getElementById("Text_Key").value;
14     return encodeURIComponent(strKey);
15 }
16
17 function GetUrl(site)
18 {
19     var encode=GetEncodeOfKey();
20
21     //web
22     if(document.getElementById("RadioButtonList_Kind_0").checked)
23     {
24         if(site=="google")
25         {
26             return "http://www.google.com/search?q="+encode+"&ei=UTF-8";
27         }
28         else
29         {
30             return "http://search.yahoo.com/search?p="+encode+"&ei=UTF-8";
31         }
32     }
33     //mp3
34     else if(document.getElementById("RadioButtonList_Kind_1").checked)
35     {
36         if(site=="google")
37         {
38             return "http://www.google.com/search?q="+encode+" mp3"+"&ei=UTF-8";
39         }
40         else
41         {
42             return "http://audio.search.yahoo.com/search/audio?&p="+encode+"&ei=UTF-8";
43
44         }
45     }
46     //img
47     else if(document.getElementById("RadioButtonList_Kind_2").checked)
48     {
49         if(site=="google")
50         {
51             return "http://images.google.com/images?q="+encode+"&ei=UTF-8";
52         }
53         else
54         {
55             return "http://images.search.yahoo.com/search/images?p="+encode+"&ei=UTF-8";
56         }
57     }
58     else
59     {
60         //alert("err");
61     }
62
63
64 }
65
66 function Button_Google_onclick()
67 {
68     window.open(GetUrl("google"));
69 }
70
71 function Button_Yahoo_onclick()
72 {
73     window.open(GetUrl("yahoo"));
74 }
75
76 // ]]>
77 </script>
78 </head>
79 <body>
80     <form id="form1" runat="server">
81     <div>
82         <br />
83         <br />
84         <strong><span style="font-size: 24pt; color: #336633">Search<br />
85         </span></strong>
86     </div>
87     <hr style="position: relative" />
88         <br />
89         <table style="left: 0px; position: relative; top: 0px">
90             <tr>
91                 <td style="width: 31px; height: 21px">
92                     <span style="font-family: Terminal">Key</span></td>
93                 <td style="width: 253px; height: 21px">
94                     <input id="Text_Key" style="width: 248px; position: relative" type="text" /></td>
95                 <td style="width: 175px; height: 21px">
96                     <asp:RadioButtonList ID="RadioButtonList_Kind" runat="server" RepeatDirection="Horizontal"
97                         Style="position: relative" Font-Names="terminal">
98                         <asp:ListItem Selected="True">Web</asp:ListItem>
99                         <asp:ListItem>Mp3</asp:ListItem>
100                         <asp:ListItem>Image</asp:ListItem>
101                     </asp:RadioButtonList></td>
102             </tr>
103             <tr>
104                 <td style="width: 31px">
105                 </td>
106                 <td colspan="2">
107                     <input id="Button_Google" style="width: 80px; position: relative" type="button" value="Google" onclick="return Button_Google_onclick()" />
108                              
109                     <input id="Button_Yahoo" style="left: -29px; width: 104px; position: relative" type="button"
110                         value="Yahoo!" onclick="return Button_Yahoo_onclick()" /></td>
111             </tr>
112         </table>
113         <br />
114         <hr style="position: relative" />
115         <asp:HyperLink ID="HyperLink_Home" runat="server" NavigateUrl="~/Default.aspx" Style="position: relative">Home</asp:HyperLink></form>
116 </body>
117 </html>
118