Unable to populate data in option field of jtable - json

Question

I have a jsp page in which i have implemented J-Table. I have a field in jtable called ClassID which i want to make as dropdown. So how am i trying to do it as :
$('#UserTableContainer').jtable({
title : 'Table of Users',
actions : {
listAction : 'CRUDController?action=list',
fields : {
ClassID : {
title : 'ClassID',
list : true,
width : '50%',
edit : true,
option:'CRUDController?action=getClassID'
},
My Model i.e. the BEAN Class is :
private int id;
private String name;
private String classID;
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getClassID() {
return classID;
}
public void setClassID(String classID) {
this.classID = classID;
}
When listAction : 'CRUDController?action=list' is called i get the populated data in jtable from servlet to the jsp
But when control comes to this line : option:'CRUDController?action=getClassID' , It goes to the dopost method of servlet class, searches the action=getClassID and then creates the jsonArray. But when the control comes back to the jsp page, it is unable to populate the dropdown in the JTable
My servlet code is :
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
if (request.getParameter("action") != null) {
List<UserModel> lstUser = new ArrayList<UserModel>();
String action = (String) request.getParameter("action");
Gson gson = new Gson();
response.setContentType("application/json");
if (action.equals("list")) {
try {
// Fetch Data from User Table
lstUser = daoForMat.getAllUserList();
// Convert Java Object to Json
JsonElement element = gson.toJsonTree(lstUser, new TypeToken<List<UserModel>>() {
}.getType());
JsonArray jsonArray = element.getAsJsonArray();
String listData = jsonArray.toString();
// Return Json in the format required by jTable plugin
listData = "{\"Result\":\"OK\",\"Records\":" + listData + "}";
response.getWriter().print(listData);
} catch (Exception ex) {
String error = "{\"Result\":\"ERROR\",\"Message\":" + ex.getMessage() + "}";
response.getWriter().print(error);
ex.printStackTrace();
}
else if(action.equals("getClassID") ){
System.out.println("I came to action getClassID");
List<String> lstClassID = new ArrayList<String>();
//Here i am able to get the List containing classID
lstClassID = GetClassList();
JsonElement element = gson.toJsonTree(lstClassID , new TypeToken<List<String>>() {
}.getType());
JsonArray jsonArray = element.getAsJsonArray();
String listData = jsonArray.toString();
// Return Json in the format required by jTable plugin
listData = "{\"Result\":\"OK\",\"Records\":" + listData + "}";
response.getWriter().print(listData );
//return jsonArray;
}
}
}
What am i doing wrong? I have written the same code for action.equals("getClassID") as that for if (action.equals("list")). **For the later condition i am able to populate the Jtable but for this condition - action.equals("getClassID") i am not able to populate the dropdown in JTable.
The only difference is when action=list i am writing a list of BEAN Class to the response. ie.List<UserModel> lstUser = new ArrayList<UserModel>(); as you can see in the servlet code
and when action=getClassID i am writing a list of String to the response i.e.List<String> lstClassID = new ArrayList<String>();
What should i write in option field of JTABLE in the jsp page so that i can populate the dropdown?** Looking forward to your solutions. Thanks in advance

Answer 1

Hey you can try this.
declare a field whch u gonna use as dropdown like this
Location:
{
title: 'Location',
width: '12%',
list: true,
options: '/JTablePractice.aspx/GetContinentalOptions',
},
and write this in your front end
public static object GetContinentalOptions()
{
using (var db = new ASPPracticesEntities1())
try
{
var numbers = db.Members.Select(c => new { DisplayText = c.Location, Value = c.Location }).ToList();
return new { Result = "OK", Options = numbers };
}
catch (Exception ex)
{
return new { Result = "ERROR", Message = ex.Message };
}
}
Donno how to write it in java but hopw it help u