Home > Developer > ASP

Link two-level drop-down boxes on a jsp page to read database data in real time

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

A two-level drop-down box linkage is implemented on a jsp (preferred for SUN enterprise-level applications) page to read database data in real time. This method is very useful and can be used only in a small modification. Designed file: serch. jsp (preferred for SUN Enterprise applications), main. js, bytetostr. js,

First, let's talk about main. js. This is javascript, and pay attention to modifying the jsp (preferred for SUN Enterprise Applications) Page name.

 

Function findObject (fName, initValue )...{
Var xml (standardization is getting closer and closer) http = new ActiveXObject ("Microsoft. xml (standardization is getting closer and closer) HTTP ");
Xml (standardization is getting closer and closer) http. open ("POST", "searchmx. jsp (preferred for SUN Enterprise Applications )? FindObject = "+ fName +" & initValue = "+ initValue, false); // modify the jsp page (preferred for SUN Enterprise applications)
Xml (standardization is getting closer and closer) http. send ();
Document. getElementById (fName). innerHTML = bytes2BSTR (xml (standardization is getting closer and closer) http. responsebody); // The bytes2BSTR function is in bytetostr. js
}

The second is bytetostr. js. This is vbscript, which does not need to be modified. Its main function is to read the data conversion string.

Function bytes2BSTR (vIn)
Dim I
StrReturn = ""
For I = 1 To LenB (vIn)
ThisCharCode = AscB (MidB (vIn, I, 1 ))
If ThisCharCode <& H80 Then
StrReturn = strReturn & Chr (ThisCharCode)
Else
NextCharCode = AscB (MidB (vIn, I + 1, 1 ))
StrReturn = strReturn & Chr (CLng (ThisCharCode) * & H100 + CInt (NextCharCode ))
I = I + 1
End If
Next
Bytes2BSTR = strReturn
End Function
 

The following is serch. on the jsp (preferred for SUN Enterprise Applications) page, you only need to modify the id in the div and the name you want, and then replace the package at the beginning. You can change the SQL statement, participate in the discussion if you do not understand

 

<% @ Page contentType = "text/html; charset = gb2312" language = "java" import = "com. sjth. zdsygl. vo. *, com. sjth. zdsygl. biz. *, java. util. *, com. sjth. zdsygl. jdbc. *, java. SQL. resultSet "%> // import the corresponding package
<%
// This part of the code is used to query the database and return a string
If (request. getParameter ("findObject ")! = Null )...{
If (request. getParameter ("findObject"). equals ("hy_dm "))...{
DBConnect conn = null;
ResultSet rs = null;
Try ...{
Out. print ("<select name = hy_dm onchange =" javascript: findObject (hymx_dm, this. value) "> ");
String SQL = "select * from dm_hy group by left (hy_dm, 7 )";
Conn = new DBConnect ();
Conn. setPstmt (SQL );
Rs = conn.exe cuteQuery (SQL );
While (rs. next ())...{
Out. print ("<option value =" + rs. getString ("hy_dm") + ">" + rs. getString ("hy_mc") + "</option> ");
}
Out. print ("</select> ");
}
Catch (Exception e )...{
}
Finally ...{
Try ...{
If (rs! = Null)
Rs. close ();
If (conn! = Null)
Conn. close ();
}
Catch (Exception e )...{
E. printStackTrace ();
}
}
}
If (request. getParameter ("findObject"). equals ("hymx_dm "))...{
DBConnect conn = null;
ResultSet rs = null;
Try ...{
Out. print ("<select name = hymx_dm> ");
String SQL = null;
If (request. getParameter ("initValue"). equals (""))...{
SQL = "select * from dm_hy ";
}
Else ...{
SQL = "select * from dm_hy where hy_dm like" + request. getParameter ("initValue") + "% ";
}
Conn = new DBConnect ();
Conn. setPstmt (SQL );
Rs = conn.exe cuteQuery (SQL );
While (rs. next ())...{
Out. print ("<option value =" + rs. getString ("hy_dm") + ">" + rs. getString ("hy_mc") + "</option> ");
}
Out. print ("</select> ");
}
Catch (Exception e )...{
}
Finally ...{
Try ...{
If (rs! = Null)
Rs. close ();
If (conn! = Null)
Conn. close ();
}
Catch (Exception e )...{
E. printStackTrace ();
}
}
}
Return;
}
%>
<Html>
<Head>
<Link href = "css/table.css" type = "text/css" rel = "stylesheet">
<Script language = vbscript src = "css/bytetostr. js"> </script>
<Script language = javascript src = "css/main. js"> </script> // import two js files.
</Head>
<Body>
<Div> industry: </div>
<Div id = "hy_dm"> </div> // used to display the returned string
<Div> industry details: </div>

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:
link to location on page grant drop database link to user in oracle how to fetch data from database in html page sfwmd real time data jsp upload file to database drop database link arduino real time data acquisition
Related Article
Formatremoteurl function of the ASP implementation format int...
ASP. NET core combined with consul cluster &docker to rea...
ASP. NET Core SignalR uses a generic hub to gracefully invoke...
ASP. NET Core 2.0 leverages Masstransit integrated RABBITMQ
Integration testing of ASP. NET Core Webapi using Xunit
CKEDITOR + CKFINDER image upload configuration (C #/asp.net/php)

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