How to populate dropdownlist with JSON data as ajax response in jQuery
Question
I am working on a j2ee application. In my application I have a drop-down list(or Select element). I want to populate this drop-down list with JSON data as a Ajax response.
Below is the code what I have:
Server side Code (json_source.java) which generates a JSON response. :
package demo.model;
import java.io.IOException;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.Statement;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import com.google.gson.*;
/**
* Servlet implementation class json_source
*/
public class json_source extends HttpServlet {
private static final long serialVersionUID = 1L;
/**
* @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
*/
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException
{
JsonArray data_json=new JsonArray();
Statement st_loginId=null;
ResultSet rs_loginId=null;
try
{
Connection con=null;
Class.forName("oracle.jdbc.OracleDriver");
/* Connection String for "OPERWH"(exadata) Database */
con=DriverManager.getConnection("jdbc:oracle:thin:*************","*****","*****");
con.setAutoCommit(true);
st_loginId=con.createStatement();
rs_loginId=st_loginId.executeQuery("select login_id \"LOGIN ID\" from user_access");
//System.out.println("entered in frame_login_code");
int login_val=0;
JsonObject json_response=new JsonObject();
while(rs_loginId.next())
{
login_val++;
JsonObject json=new JsonObject();
json.addProperty("value", "login"+login_val);
json.addProperty("text", rs_loginId.getString(1));
data_json.add(json);
}
System.out.println(data_json);
json_response.add("aaData", data_json);
response.setContentType("application/Json");
response.getWriter().write(json_response.toString());
System.out.println(json_response);
}
catch(Exception ex)
{
System.out.println("Exception occured during retrieval of Login_Id in ComboBox :"+ex);
ex.printStackTrace();
}
}
/**
* @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
*/
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
}
}
and the JSON data which successfully generated through above server side code :
{
"aaData": [{
"value": "login1",
"text": "kapils"
}, {
"value": "login2",
"text": "davidn"
}, {
"value": "login3",
"text": "alanp"
}]
}
and Below is my Client side code (source1.jsp) which generate ajax request:
(Using $.ajax() ) :
<script type="text/javascript">
$(document).ready(function()
{
$('#id_trial').click(function() {
alert("entered in trial button code");
$.ajax({
type: "GET",
url:"/demo_trial_application/json_source",
dataType: "json",
success: function (data) {
$.each(data.aaData,function(i,data)
{
alert(data.value+":"+data.text);
var div_data="<option value="+data.value+">"+data.text+"</option>";
alert(div_data);
$(div_data).appendTo('#ch_user1');
});
}
});
});
});
</script>
<body>
<div id="div_source1">
<select id="ch_user1" >
<option value="select"></option>
</select>
</div>
<input type="button" id="id_trial" name="btn_trial" value="Trial Button..">
</body>
OR Using ($.getJSON()) :
$.getJSON("/demo_trial_application/json_source", function (data) {
$.each(data.aaData, function (i, data) {
var div_data = "<option value=" + data.value + ">" + data.text + "</option>";
alert(div_data);
$(div_data).appendTo('#ch_user1');
});
});
Now when I clicked on button (#id_trial), the server side code executes successfully and as a result JSON object created. but i am not getting that "JSON response" in callback function of Success parameter using jQuery's ajax call.
and apart from jQuery's ajax call I also tried with $.getJSON function to receive JSON response..but I didn't get JSON data.
So please tell me if there is any mistake in my code, and how to get JSON data using above code and populate drop-down list.
I want to populate my dropdownlist with JSON data using ajax response. please help me to sort out this problem...its very urgent for my application.
8 answers
solution1
19 ACCPTED 2013-11-01 11:23:22
try to change the jquery method variable, it might be causing the problem (ie, you are using the data variable coming from the ajax callback PLUS are then trying to assign it to the item object in the jquery method - changed to obj ):
$.ajax({
type: "GET",
url:"/demo_trial_application/json_source",
dataType: "json",
success: function (data) {
$.each(data.aaData,function(i,obj)
{
alert(obj.value+":"+obj.text);
var div_data="<option value="+obj.value+">"+obj.text+"</option>";
alert(div_data);
$(div_data).appendTo('#ch_user1');
});
}
});
});
solution2
3 2014-08-21 23:35:31
I use "for"
var List;
jQuery.ajax({
url: "/demo_trial_application/json_source",
type: "POST",
dataType: "json",
async: false,
success: function (data) {
List = data.aaData
$('#ch_user1').empty();
$('#ch_user1').append('<option value="">All</option>');
for (i in List ) {
$('#ch_user1').append('<option value="' + List[i].value + '">' + List[i].text + '</option>');
}
}
});
solution3
2 2017-01-23 11:04:09
Working with Laravel this is my solution:
$("#YOUR_DIV").on("change", function(){
var selected = $(this).val();
makeAjaxRequest(selected);
})
function makeAjaxRequest(opts){
$.ajax({
type: "GET",
url : '{{ action('YOUR_CONTROLLER@YOUR_FUNCTION') }}',
data: { opts: opts },
success: function(data) {
NEW_JS_FUNCTION(data);
}
});
}
function NEW_JS_FUNCTION(params) {
$('#YOUR_DIV').empty();
$('#YOUR_DIV').append('<option value="">ALL</option>');
params.forEach(function(entry){
$('#YOUR_DIV').append('<option value="' + entry.KEY+ '">' + entry.TEXT + '</option>');
});
}
It works. Hope this can help.
solution4
1 2016-11-18 11:09:49
We can populate dropdown like below . it's very easy for you all i guess.
var options = $("#options");
$.getJSON("/Country/GetAll/", function(response) {
$.each(response, function() {
options.append($("<option />").val(this.Id).text(this.Name));
});
});
solution5
0 2016-09-29 11:48:07
<div class="col-lg-4">
<%--<input type="text" class="form-control" id="txtGender" />--%>
<select class='form-control DropDown' id="txtGender"></select>
</div>
--------------------------------------------------------------------------------
$(document).ready(function () {
$.ajax({
type: "POST",
url: "AjaxCallGrid.asmx/GetDropDown",
dataType: "json",
contentType: "application/json; charset=utf-8",
success: function (result) {
$('.DropDown').empty();
$('.DropDown').append("<option value='0'>---Select---</option>");
$.each(result.d, function (key, value) {
$('.DropDown').append($("<option></option>").val(value.iD).html(value.firstName));
});
}
});
});
-------------------------------------------------------------------------
[WebMethod]
public List<Students> GetDropDown()
{
DataTable dt = new DataTable();
List<Students> result = new List<Students>();
using (SqlConnection con = new SqlConnection(@"Data Source=DOS-PC\MARJI;Initial Catalog=examples;Integrated Security=True"))
{
using (SqlCommand cmd = new SqlCommand("select id,firstname from Students ", con))
{
con.Open();
SqlDataAdapter da = new SqlDataAdapter(cmd);
da.Fill(dt);
if (dt.Rows.Count > 0)
{
for (int i = 0; i < dt.Rows.Count; i++)
{
result.Add(new Students
{
iD = Convert.ToInt32(dt.Rows[i]["id"].ToString()),
firstName = dt.Rows[i]["firstname"].ToString()
}
);
}
}
return result;
}
}
solution6
0 2017-12-09 10:48:03
The simplest way is to download this library https://github.com/JocaPC/jquery-view-engine/tree/master/src . This JQuery library directly loads JSON into dropdows and looks like a perfect match for your example. You just need to put the following code:
success: function (data) {
$('#ch_user1').view(data.aaData);
}
Take a look at this page https://jocapc.github.io/jquery-view-engine/docs/ajax-dropdown for more details.
solution7
0 2018-04-19 10:32:17
Try as follows
<select id="xxx"></select>
success: function (response) {
for (var i = 0; i < response.length; i++) {
$("#xxx").append("<option value='" + response[i]["id"] + "'>" + response[i]["name"] + "</option>");
}
}
solution8
0 2021-10-13 08:46:00
This is how you can do it:
$(".ddEvent").on('change', function(e){
const selectedEvent = $(this).val();
$("#ddExhibitor").empty();
$("#ddExhibitor").append("<option value='-1'>-- Choose Exhibitor --</option>");
$.ajax({
url: '/dashboard/get-exhibitors/'+selectedEvent,
type: 'GET',
success: function success(data) {
if(data.exhibitors.length > 0){
data.exhibitors.forEach(exhibitor => {
$("#ddExhibitor").append("<option value='" + exhibitor.id + "'>" + exhibitor.exhibitor_name + "</option>");
});
}
},
error: function error(err) {
alert(data.error);
}
});
});
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