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Example of implementing provincial/municipal level-2 linkage using Ajax

Source: Internet
Author: User
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// In the example, the provincial/municipal secondary node does not need to be refreshed, and the provincial/municipal connection server dynamically loads the municipal name

<% @ Page Language = "C #" autoeventwireup = "true" codefile = "ajaxcity. aspx. cs" inherits = "ajaxcity" %>
<! Doctype HTML public "-// W3C // dtd xhtml 1.0 strict // en" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<HTML xmlns = "http://www.w3.org/1999/xhtml">
<Head>
<Title> obtain the city name by province name </title>

<SCRIPT type = "text/JavaScript">
VaR XMLHTTP;
// Create an XMLHTTPRequest object
Function createhttp ()
{
If (window. activexobject)
{
XMLHTTP = new activexobject ("Microsoft. XMLHTTP ");
}
Else
{
XMLHTTP = new XMLHttpRequest ();
}
}
Function showcity ()
{
VaR url = "showcity. aspx? Id = "+ document. getelementbyid (" Province "). value;
// Create an XMLHTTPRequest object
Createhttp ();
// Specify the Server Response Function
XMLHTTP. onreadystatechange = showres;
XMLHTTP. Open ("get", URL, true );
XMLHTTP. Send (null );
}
Function showres ()
{
If (XMLHTTP. readystate = 4)
{
If (XMLHTTP. Status = 200)
{
Addcity ();
}
}
}
// Add a city name based on the province name
Function addcity ()
{
VaR citys = Document. getelementbyid ("city ");
Clearoptions (citys );
// Obtain server response data
VaR TXT = XMLHTTP. responsetext;
VaR res = TXT. Split (",");
// Add new data
For (VAR I = 0; I <res. length; I ++)
{
VaR opt = Document. createelement ("option ");
Opt. Text = res [I];
Opt. value = I;
Citys. Options. Add (OPT );
}
}
// Clear historical records
Function clearoptions (citys)
{
For (VAR I = Citys. Options. length; I>-1; I --)
{
Citys. Options. Remove (I );
}
}
</SCRIPT>
</Head>
<Body>
<Select id = "Province" runat = "server" style = "width: 141px" onchange = "showcity ();">
<Option selected = "selected" value = "1"> Hubei </option>
<Option value = "2"> Jiangsu </option>
<Option> </option>
</SELECT>
<Select id = "city" runat = "server" style = "width: 139px">
<Option selected = "selected"> </option>
</SELECT>
</Body>

</Html>

 

Using system;
Using system. Data;
Using system. Data. sqlclient;
Using system. configuration;
Using system. collections;
Using system. Web;
Using system. text;
Using system. IO;
Using system. Web. Security;
Using system. Web. UI;
Using system. Web. UI. webcontrols;
Using system. Web. UI. webcontrols. webparts;
Using system. Web. UI. htmlcontrols;

Public partial class showcity: system. Web. UI. Page
{
Protected void page_load (Object sender, eventargs E)
{
If (! This. ispostback)
{
String id = request. querystring ["ID"]. tostring ();
This. showinfo (ID );
}
}
/// <Summary>
/// Query the city name by province ID
/// </Summary>
/// <Param name = "ID"> </param>
Private void showinfo (string ID)
{
Sqlconnection con = new sqlconnection ("Data Source = (local); initial catalog = Master; Integrated Security = sspi ");
Sqlcommand cmd = new sqlcommand ("select * from city where pid =" + Int. parse (ID), con );
Con. open ();
Sqldatareader READ = cmd. executereader ();
Stringbuilder STR = new stringbuilder ();
While (read. Read ())
{
Str. append (read ["cityname"]. tostring () + ",");
}
Response. Write (STR );
}
}

 

This article is an English version of an article which is originally in the Chinese language on aliyun.com and is provided for information purposes only. This website makes no representation or warranty of any kind, either expressed or implied, as to the accuracy, completeness ownership or reliability of the article or any translations thereof. If you have any concerns or complaints relating to the article, please send an email, providing a detailed description of the concern or complaint, to info-contact@alibabacloud.com. A staff member will contact you within 5 working days. Once verified, infringing content will be removed immediately.

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