How to display contents automatically ?

Question

Hi, all
I have a html form. It has a dropdown list and a text box in it. User will be allowed to select a employee id from the drop down list. (which is coming from DB.)
Then as soon as id is selected, that particular employee name should be displayed in the text box automatically�..immediately. again (again from DB).
Sql query as follows :
select distinct (emp#) from eaddress.-----for the id drop down list.
select distinct eid,ename from emp where eid=emp#---------for text box to display the name���.( from another table)
Can anyone suggest me how to do this ????
Regards,
Thank u.
Ash

Answer 1

Thank u ram,
but, i couldn't understand following lines.
especiallly
the statement within if -condition.
==============================================
if(id != null && (id ==
String.valueOf(code.get(i)))){
%>
selected <!-- set this option as selected -->
<% } %>
<!-- close option begin tag --><%=code.get(i)%></OPTION>
<% } %>
</SELECT></td>
</tr>
=================================
could u pls. clarify my doubt ? what should be done
within if condition ?Hmmm....everything's done actually :), i put in the comments so that you could understand the code better.
1. The first time this page is accessed, there would no code chosen by the user, hence the first code would be selected by default. You had coded only for this..
2. Now, the user selects a code, you have a form submit, the code selected by the user goes to the server. In the server, you get the name corresponding to the code and populate that in a textfield. However this is not enough. The user had entered a code and when you show the form back to the user, the code should be what the user selected and the textfield should have the corresponding name, right ?
1. first check if this is the first time user views the form or if he has already selected a code. To do this, check for the request parameter called 'code'.
<%
String id = request.getParameter("code")
//here if id is null, it means user is viewing the form first time, else he has selected a code and form's submitted to server to get the corresponding name
%>Next if id is not null, as you iterate through each option element, you should check if the code matches the one the user selected and if so set that code as the default value. This is how you set a default value for a select field
<option name = "foo" value = "bar" selected>foo</option>
<%
for(int i=0;i<code.size();i++){                       
%>
<OPTION NAME = "<%=code.get(i)%>"  Value = "<%=code.get(i)%>"
<!-- note this option tag has not yet been closed.-->
<!-- it can be closed only after checking for selected option -->
<!-- check to see if this option should be the 'selected' option -->
<%
  if(id != null && (id == String.valueOf(code.get(i)))){
  // the request params 'code' matches with this value of code
  //so set this option as selected and close the option tag
%>
   selected>
<%} //close if loop
<%=code.get(i)%></OPTION>
<% } //close for loop%>
</SELECT></td>
ram.