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logeswaran
need help...................please
4 Answer(s)      2 years and a month ago
Posted in : JSP-Interview Questions


I have a problem in my JSP Coding. How to retrive value from database in to text field when user select one value from dropdown list. For example, if user select on of name in dropdown list (the name list is also coming from database)every information about the person should show in texfield that already create in the web page. I'm really stuck on this area. Please help me.

By the way, I'm using access Database and JSP coding.

Thank You.


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July 9, 2012 at 12:57 PM


Here is an application that retrieves table name from database and display in dropdown box. When the user select particular name from dropdown corresponding values will get displayed into textboxes.

1)selectname.jsp:

<%@page import="java.sql.*"%>
<html>
<head>
<script type="text/javascript">
function showEmp(emp_value){ 
 if(document.getElementById("address").value!="-1"){
 xmlHttp=GetXmlHttpObject()
if (xmlHttp==null){
 alert ("Browser does not support HTTP Request")
 return
 }
var url="getvalue.jsp"
url=url+"?name="+emp_value
xmlHttp.onreadystatechange=stateChanged 
xmlHttp.open("GET",url,true)
xmlHttp.send(null)
}
else{
 alert("Please Select Employee Id");
}
}
function stateChanged(){ 
document.getElementById("email").value ="";
document.getElementById("address").value ="";
if (xmlHttp.readyState==4 || xmlHttp.readyState=="complete") { 
var showdata = xmlHttp.responseText; 
    var strar = showdata.split(":");
if(strar.length==1){
  document.getElementById("address").focus();
  alert("Please Select Employee Id");
  document.getElementById("email").value =" ";
document.getElementById("address").value =" ";
 }
 else if(strar.length>1) {
var strname = strar[1];
document.getElementById("address").value= strar[1];
document.getElementById("email").value= strar[2];
 }
 } 
}

function GetXmlHttpObject(){
var xmlHttp=null;
try{
 xmlHttp=new XMLHttpRequest();
 }
catch (e) {
 try {
  xmlHttp=new ActiveXObject("Msxml2.XMLHTTP");
  }
 catch (e)  {
  xmlHttp=new ActiveXObject("Microsoft.XMLHTTP");
  }
 }
return xmlHttp;
}
</script>
</head>
<body>
<form name="employee">
<br><br>
<table border="0" width="400px" align="center" bgcolor="#CDFFFF">
<div id="mydiv"></div>
   <tr><td><b>Select Employee Name</b></td><td> 
   <select name="name" onchange="showEmp(this.value);">
   <option value="-1">Select</option> 
   <%
   Class.forName("com.mysql.jdbc.Driver").newInstance();

Connection conn = DriverManager.getConnection( "jdbc:mysql://localhost:3306/test","root","root");
String query = "select * from employee";

Statement st = conn.createStatement();
ResultSet rs = st.executeQuery(query);
while(rs.next())
{
%>
<option value="<%=rs.getString("name")%>"><%=rs.getString("name")%></option>
<%
}
%>
 </select>
</td></tr>
<tr><td ><b>Employee Address:</b></td><td>
<input  type="text" name="address" id="address" value=""></td></tr>
<tr><td><b>Employee Email:</b></td><td>
<input  type="text" name="email" id="email" value=""></td></tr>

</table>
</form>    
<table border="0" width="100%" align="center">
<br>
<br>
</table>
</body>
</html>

2)getvalue.jsp:

<%@page import="java.sql.*"%>
<%
String emp_id = request.getParameter("name").toString();
String data="";

int sumcount=0; 
Statement st;
try {
Class.forName("com.mysql.jdbc.Driver").newInstance();

Connection conn = DriverManager.getConnection( "jdbc:mysql://localhost:3306/test","root","root");
String query = "select * from employee where name='"+emp_id+"'";

st = conn.createStatement();
ResultSet rs = st.executeQuery(query);
while(rs.next())
{
data = ":" + rs.getString("address") +":"+  rs.getString("email");
}
out.println(data);
}
catch (Exception e) {
e.printStackTrace();
}
%>


July 9, 2012 at 12:58 PM


3)For the above code, we have created following table:

CREATE TABLE employee (
id bigint(255) default NULL,
name varchar(255) default NULL,
address varchar(255) default NULL,
contactNo int(255) default NULL,
email varchar(255) default NULL
)



July 9, 2012 at 12:59 PM


Please visit the following link:

http://www.roseindia.net/jsp/comboSelect.shtml



July 9, 2012 at 5:31 PM


thank you very much



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