Home > Developer > Web Develop

The UpdatePanel Control for ASP.

Source: Internet
Author: User
Developer on Alibaba Coud: Build your first app with APIs, SDKs, and tutorials on the Alibaba Cloud. Read more ＞

In order to improve the refresh efficiency of tree control, local refresh technique is used.

The. aspx code is as follows:



<%@ page language= "C #" autoeventwireup= "true" codefile= "China urban District aspx.cs" inherits= "China urban District"%>


<! DOCTYPE HTML PUBLIC "-//W3C//DTD XHTML 1.0 transitional//en" "Http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd ">


<title></title>
<style type= "Text/css" >
. fl{Float:left;}
</style>
<body>
<form id= "Form1" runat= "Server" >
<div>
<div class= "FL" runat= "Server" >
<p><%=datetime.now.tostring ()%></p>
<asp:treeview id= "Tv_china" runat= "Server"
Onselectednodechanged= "tv_china_selectednodechanged" expanddepth= "0" >
</asp:TreeView>
<asp:scriptmanager
Id= "ScriptManager1" runat= "Server" >
</asp:ScriptManager>
</div>
<asp:updatepanel id= "UpdatePanel1" runat= "Server" >
<ContentTemplate>
<p><%=datetime.now.tostring ()%></p>
Text:<asp:label id= "Label1" runat= "Server" text= "" ></asp:Label>
Value:<asp:label id= "Label2" runat= "Server" text= "" ></asp:Label>
Valuepath:<asp:label id= "Label3" runat= "Server" text= "" ></asp:Label>

</ContentTemplate>
<triggers >
<asp:asyncpostbacktrigger controlid= "Tv_china"/>
</Triggers>
</asp:UpdatePanel>


</div>

</form>
</body>

Observe the change of time within two controls to see the effect of local refresh.

The. Aspx.cs code is as follows:

Using system;using system.collections.generic;using system.linq;using system.web;using System.Web.UI;using System.web.ui.webcontrols;using system.data.oledb;public partial class China City: system.web.ui.page{string str_cnn = "Pr ovider=microsoft.jet.oledb.4.0;    Data source= ";    String str_sourcefile = "~/data/china.mdb";    OleDbConnection CNN;    OleDbCommand cmd;    OleDbDataReader Datar;    String Str_sql; protected void Page_Load (object sender, EventArgs e) {if (!        IsPostBack) {maketree ();        }} protected void Maketree () {TreeNode _tnode, _parentnode;        String str_conn = str_cnn + MapPath (str_sourcefile);        CNN = new OleDbConnection (Str_conn); Cnn.        Open ();        Build a level (province) Str_sql = "Select P_id,p_name from T_province";        cmd = new OleDbCommand (Str_sql, CNN); Datar = cmd.        ExecuteReader (); while (Datar.            Read ()) {_tnode = new TreeNode (); _tnode. Text = Datar["P_name"].            ToString (); _tnode. Value= "P_" +datar["p_id"].            ToString (); Tv_china.                Nodes.Add (_tnode);        }//Build Level Two (city) str_sql = "Select C_id,c_name,c_pid from T_city";        cmd = new OleDbCommand (Str_sql, CNN); Datar = cmd.        ExecuteReader (); while (Datar. Read ()) {_parentnode = Tv_china. FindNode ("P_" + datar["C_pid"].            ToString ());            _tnode = new TreeNode (); _tnode. Text = datar["C_name"].            ToString (); _tnode. Value = "C_" + datar["c_id"].            ToString ();        _parentnode.childnodes.add (_tnode); }//Build Level Three (zone) str_sql = "Select T_city.c_pid, t_city.c_id, t_district.d_id, t_district.d_name from T_district        INNER JOIN t_city on t_district.d_cid = t_city.c_id ";        cmd = new OleDbCommand (Str_sql, CNN); Datar = cmd.        ExecuteReader (); while (Datar. Read ()) {_parentnode = Tv_china. FindNode ("P_" + datar["C_pid"]. ToString () + "/c_" + datar["c_id"].            ToString ());            _tnode = new TreeNode (); _tnode. Text = datar["D_name"].            ToString (); _tnode. Value = "D_" + datar["d_id"].            ToString ();        _parentnode.childnodes.add (_tnode); } CNN.        Close ();        } protected void Tv_china_selectednodechanged (object sender, EventArgs e) {TreeNode _tnode; _tnode = Tv_china.        SelectedNode; Label1.Text = _tnode.        Text; Label2.Text = _tnode.        Value; Label3.text = _tnode.    Valuepath; }}
The effect is as follows:



The UpdatePanel Control for ASP.

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.

Related Keywords:
asp net gallery control asp net slider control asp net chart control asp net scheduler control calendar control in asp net asp net calendar control popup gridview control in asp net

Contact Us

The content source of this page is from Internet, which doesn't represent Alibaba Cloud's opinion; products and services mentioned on that page don't have any relationship with Alibaba Cloud. If the content of the page makes you feel confusing, please write us an email, we will handle the problem within 5 days after receiving your email.

If you find any instances of plagiarism from the community, please send an email to: info-contact@alibabacloud.com and provide relevant evidence. A staff member will contact you within 5 working days.

What's Trending
Top 10 Tags
datastax versions naming convention zookeeper client class definition md5 microsoft sql server 2005 data structures exception handling error handling
Top 10 Keywords
microsoft download center down wordpress address url site address url wordpress address url windows installer 4 0 download 302 not found web address url definition site address url wordpress db2 integer mac os installation step by step pdf abbreviation for return

A Free Trial That Lets You Build Big!

Start building with 50+ products and up to 12 months usage for Elastic Compute Service

Get Started for Free

  • Sales Support

    1 on 1 presale consultation

    Chat Contact Sales

  • After-Sales Support

    24/7 Technical Support 6 Free Tickets per Quarter Faster Response

    Open a Ticket

  • Alibaba Cloud offers highly flexible support services tailored to meet your exact needs.

    Learn More