Question

onchange on combobox

Asked by: widiyanto

Hi,

I would like to ask about the onchange method in javascript.

For example: if there is name combobox in my jsp page, the names inside it are retrieved from database. if I want like if I select 'lala' from combobox then it will display a table of information about 'lala' such as her address and contact no but if I never select anything then it doesn't show the table.

I've manage to find out how to do that by reloading to that page and passing the parameter name so the url is something like this: http://192.168.28.174:8080/TWIS/intranet/sample/showDetail1.jsp?samplecode=lala

if its empty then it will be like this:
http://192.168.28.174:8080/TWIS/intranet/sample/showDetail1.jsp?samplecode=
which I don't want... I want it to be like this:
http://192.168.28.174:8080/TWIS/intranet/sample/showDetail1.jsp

cos there are a lot of pages that is linked to this page so if I change that it will become more complicated. any ideas how to do that? thanks.

here is my sample code:
<select name="samplecode" size="1" id="select" onchange="location.reload('showDetail1.jsp?samplecode='+this.options[this.selectedIndex].value)">
<option selected><%= request.getParameter("samplecode")%></option>
<option></option>
<%
        conn = db.getConnection();
        stmt = conn.createStatement();
        sql="select sample from sampledefinition";
        rs=stmt.executeQuery(sql);
        while(rs.next()){
%>
       <option value="<%=rs.getString("sample")%>"><%=rs.getString("sample")%></option>
       <%}
            rs.close();
            stmt.close();
            conn.close();
      %>
     </select>

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Asked On
2004-10-29 at 02:37:47ID21187448
Tags

onchange

,

combobox

,

javascript

Topic

JavaScript

Participating Experts
2
Points
100
Comments
7

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Answers

 

by: minichickenPosted on 2004-10-29 at 02:46:40ID: 12442608

You can do somoething like this: A form which will submit to it self. and on your ASP page you just use Request.Querystring to get the value.

<form name="form1" method="get" action="">
  <select name="select" onChange="form1.submit()">
    <option>Value1</option>
    <option>Value2</option>
    <option>Value3</option>
  </select>
</form>

 

by: widiyantoPosted on 2004-10-29 at 02:54:04ID: 12442640

thanks for the quick response.. but I'm using jsp.. :D

 

by: minichickenPosted on 2004-10-29 at 02:57:13ID: 12442653

Oh sorry, but it will work basically the same way, on your JSP page, use the method to request values from the URL querystring.

<form name="form1" method="get" action="">
  <select name="select" onChange="form1.submit()">
    <option>Value1</option>
    <option>Value2</option>
    <option>Value3</option>
  </select>
</form>

 

by: steve_bagnallPosted on 2004-10-29 at 04:14:22ID: 12443027

Hi,

I think this is what you're looking for..

request.getParameter("select");

Cheers, Steve

 

by: widiyantoPosted on 2004-10-29 at 18:50:39ID: 12450023

ok thanks....
I tried the code and it works... but when I want to link to that page, I got http error--404 eventhough I put the file on the correct page  or sometimes it java nullpointer error... can help me? thanks.

 

by: minichickenPosted on 2004-10-30 at 02:17:45ID: 12450988

How about this?

<form name="form1" method="get" action="showDetail1.jsp">
  <select name="select" onChange="form1.submit()">
    <option>Value1</option>
    <option>Value2</option>
    <option>Value3</option>
  </select>
</form>

 

by: widiyantoPosted on 2004-10-31 at 16:54:04ID: 12459997

ok.. Thanks...

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