I tried to binding remote DataSource for my Kendo DropDownList, but the Kendo Datasource could parse the json response correctly. The result turns out to be "undefined" and recognize every single charachter in the data as a selection. I have no idea where the bug is, please help me!
Responce from controllor:
"[{"CODE_ID":"A","CODE_NAME":"Free"},{"CODE_ID":"B","CODE_NAME":"Borrowed"},{"CODE_ID":"U","CODE_NAME":"Unable"},{"CODE_ID":"C","CODE_NAME":"To be Borrowed"}]"
HTML Result
Front-end js code for Kendo DropDownList
$(document).ready(function () {
$("#search_category").kendoDropDownList({
dataTextField: "CODE_NAME",
dataValueField: "CODE_ID",
dataSource: {
transport: {
read: {
type: "GET",
url: "/BookData/GetDataList",
data: { name: "category" },
dataType: "json"
}
},
},
});
}
BookDataControllor
[HttpGet()]
public JsonResult GetDatalist(string name)
{
string result;
try
{
switch (name)
{
case "category":
result = codeService.GetDataList("CODE_ID, CODE_NAME",
"BOOK_CODE", "CODE_TYPE = 'BOOK_STATUS'");
break;
default:
return Json(false);
}
return Json(result, JsonRequestBehavior.AllowGet);
}
catch (Exception ex)
{
return Json(false);
}
}
back-end class CodeService
private DataTable GetDataTable(string sql)
{
DataTable dt = new DataTable();
using (SqlConnection conn = new SqlConnection(this.GetDBConnectionString()))
{
conn.Open();
SqlCommand cmd = new SqlCommand(sql, conn);
SqlDataAdapter sqlAdapter = new SqlDataAdapter(cmd);
sqlAdapter.Fill(dt);
conn.Close();
}
return dt;
}
public string GetDataList(string col, string src, string cond)
{
DataTable dt = GetDataTable(string.Format(#"SELECT {0} FROM {1} WHERE {2}",
col, src, cond).ToUpper());
string result = JsonConvert.SerializeObject(dt);
return result;
}
You are returning CODE_ID and CODE_NAME in your controller, but the values you're referencing on the front-end are Category_Name and Category_ID. Change them to reference the correct column names:
$('#search_category').kendoDropDownList({
dataTextField: 'CODE_NAME',
dataValueField: 'CODE_ID',
dataSource: {
transport: {
read: {
type: 'GET',
url: '/BookData/GetDataList',
data: { name: 'category' },
dataType: 'json',
success: function (response) {
console.log(response);
}
}
}
}
});
It seems that even returning your data with Json(result) as JsonResult, the response content could be a string, which the DataSource is not handling the right way.
Try enrusing that it will be json with parse method:
$(document).ready(function () {
$("#search_category").kendoDropDownList({
dataTextField: "CODE_NAME",
dataValueField: "CODE_ID",
dataSource: {
transport: {
read: {
type: "GET",
url: "/BookData/GetDataList",
data: { name: "category" },
dataType: "json"
}
},
schema: {
parse: function(data) {
// Here you can check what 'data' really is
console.log(data);
return JSON.parse(data);
}
}
},
});
}
Related
I have web page with dropdown list "ListBox" with email address of users.
How do I make a function that update the dropdownlist "ListBox" everytime when I add new email user in the dropdown list ?
I have trying this solution without success because the dropdown list it emptied, instead of add new user.
This is my code :
nnewuser.txuser = $("[id*=txuser]").val();
$.ajax({
type: "POST",
url: "prefix.aspx/Savepnusers" + qString,
data: '{nnewuser: ' + JSON.stringify(nnewuser) + '}',
contentType: "application/json; charset=utf-8",
dataType: "json",
success: function (response) {
if ($("[id*=txuser]").val()) {
alert("Ok");
alert(JSON.stringify(nnewuser));
$("[id*=ListBox1]").html(response);
}
},
failure: function (response) {
alert(response.d);
},
error: function (response) {
alert(response.d);
},
error: function (xhr, ajaxOptions, thrownError) {
alert("error : " + thrownError + JSON.stringify(nnewuser));
}
});
return false;
});
Savepnusers
public class pnnusers
{
public string txuser { get; set; }
}
[WebMethod(EnableSession = true)]
[ScriptMethod]
public static void Savepnusers(pnnusers nnewuser)
{
string sql = #String.Format(" INSERT INTO `tbl_email` (email) VALUES (?); ");
using (OdbcConnection cn =
new OdbcConnection(ConfigurationManager.ConnectionStrings["cn"].ConnectionString))
{
using (OdbcCommand command =
new OdbcCommand(sql, cn))
{
try
{
command.Connection.Open();
command.Parameters.AddWithValue("param1", nnewuser.txuser.ToString());
command.ExecuteNonQuery();
}
catch (Exception ex)
{
throw ex;
}
finally
{
command.Connection.Close();
}
}
}
}
DropDownList
private void MTListBox1()
{
DataTable dt = new DataTable();
sql = #String.Format(" SELECT ");
sql += String.Format(" LOWER(Email) AS UserEmail ");
sql += String.Format(" FROM ");
sql += String.Format(" tbl_email ORDER BY LOWER(Email) ASC; ");
using (OdbcConnection cn =
new OdbcConnection(ConfigurationManager.ConnectionStrings["cn"].ConnectionString))
{
using (OdbcCommand command =
new OdbcCommand(sql, cn))
{
try
{
command.Connection.Open();
OdbcDataAdapter sqlDa = new OdbcDataAdapter(command);
sqlDa.Fill(dt);
if (dt.Rows.Count > 0)
{
ListBox1.DataTextField = "UserEmail";
ListBox1.DataValueField = "UserEmail";
ListBox1.DataSource = dt;
ListBox1.DataBind();
}
}
catch (OdbcException ex)
{
string msg = "Fetch Error:";
msg += ex.Message;
throw new Exception(msg);
}
finally
{
command.Connection.Close();
}
}
}
}
There are 2 main problems here:
First, your Savepnusers method does not return anything, so you can't use response in AJAX calls. What you need is that re-initialize ListBox1 or append new item after Savepnusers complete successfully:
Secondly, it seems you can't send nnewuser as parameter correctly. You don't need to have pnnusers class instead just use string type as a parameter.
So server-side:
public static void Savepnusers(string nnewuser)
On client-side, you need to add dropdownlist item with jquery:
var txtUser = $("[id*=txuser]").val();
$.ajax({
type: "POST",
url: "prefix.aspx/Savepnusers",
data: JSON.stringify({ nnewuser: txtUser }),
contentType: "application/json; charset=utf-8",
dataType: "json",
success: function () {
//Since you can't use response object, you can append new item to dropdownlist
if (txtUser) {
$("[id*=ListBox1]").append('<option value="'+txtUser+'">'+txtUser+'</option>');
}
},
failure: function (response) {
alert(response.d);
},
error: function (response) {
alert(response.d);
},
error: function (xhr, ajaxOptions, thrownError) {
alert("error : " + thrownError + JSON.stringify(nnewuser));
}
});
See: asp dropdownlist dynamic value from javascript issue
I have a problem displaying the data in the dropdown list using select2. I think the reason is the Query returning many rows. when I limit the number of Row to 50 (where Rownum <=100 ) the data displayed but when I remove the where condition no data display. The PatientDemo table has more than 600000 rows Any help how to solve this issue. I am using Orcale and C#
View
<link href="~/Content/css/select2.min.css" rel="stylesheet" />
<div class="jumbotron">
<input type="hidden" id="textBoxVal" />
<select class="mySelect2" style="width:500px;">
</select>
</div>
<script>
$(document).ready(function () {
$(".mySelect2").select2({
placeholder: "Select category",
allowClear: true,
theme: "classic",
ajax: {
url: "/Home/GetCategory",
dataType: 'json',
delay: 10000,
data: function (params) {
return {
searchTerm: params.term
};
},
processResults: function (data, params) {
return {
results: data
};
}
}
});
});
$(".mySelect2").on("change", function () {
var catId = $(this).val();
$("#textBoxVal").val(catId);
var textBoxValueData = $("#textBoxVal").val();
$.ajax({
url: '/Home/Save?data=' + textBoxValueData,
dataType: 'json',
type: 'post',
});
});
Model
public class Select2Model
{
public string id { get; set; }
public string text { get; set; }
}
C#
public JsonResult GetCategory(string searchTerm)
{
var list = new List<Select2Model>();
using (OracleConnection conn = new OracleConnection(WebConfigurationManager.ConnectionStrings["PatientRecord"].ConnectionString))
{
conn.Open();
OracleCommand cmd = new OracleCommand();
cmd.Connection = conn;
cmd.CommandText = #"SELECT PATIENT, NAMEFORWARD FROM PATIENTDEMO ";
cmd.CommandType = CommandType.Text;
OracleDataReader rdr = cmd.ExecuteReader();
while (rdr.Read())
{
list.Add(new Select2Model()
{
text = rdr["NAMEFORWARD"].ToString(),
id = rdr["Patient"].ToString()
});
}
var dataList = list.ToList();
if (searchTerm != null)
{
dataList = list.Where(x => x.text.Contains(searchTerm)).ToList();
}
var modifiedData = dataList.Select(x => new {
id = x.id,
text = x.text
});
return Json(modifiedData, JsonRequestBehavior.AllowGet);
}
}
public JsonResult Save(string data)
{
return Json(0, JsonRequestBehavior.AllowGet);
}
600000 rows in a drop down list is not a user friendly one. Instead why don't you implement a drop down list with auto complete?
Check the example at the bottom of this page: https://api.jqueryui.com/autocomplete/
Update:
In your case you source would be a ajax call to the server side to pull the relevant data. Like this:
$('#myautocomplete').autocomplete({
type: "POST",
minLength: 3,
source : function (request, response)
{
var source_url = "../handlers/MyLookup.ashx?someparameter=" + $("#someparameter").val();
$.ajax({
url: source_url,
dataType: "json",
data: request,
success: function (data) { response(data); },
error : function (a,b,c) { HandleLookUpError(a); }
});
},
select: function (event, ui) { $('#result').val(ui.item.id); }
});
Note the source_url variable and the ajax call in the above code.
More details on how to load data from server side is here: https://stackoverflow.com/a/8873641/218408
public class theatresController : ApiController
{
[HttpGet]
public static DataTable GetAlltheatredet()
{
try
{
string connString = "Server=localhost;database=mytable;uid=root;";
string query = "SELECT TheatreName FROM `mytable`.`theatredetails`";
MySqlDataAdapter ma = new MySqlDataAdapter(query, connString);
DataSet DS = new DataSet();
ma.Fill(DS);
return DS.Tables[0];
}
catch (MySqlException e)
{
throw new Exception(e.Message);
}
}
I am fetching my table data from DB by using datatable. How can I convert all these datas to json
I tried by using this in an html file
$(document).ready(function ()
{
$("#Theaterdet").click(function ()
{
alert("in document submit");
$.ajax({
type: "GET",
url: "/api/theatres/",
dataType: 'json',
success: function (data)
{
},
error: function ()
{
alert("Error while invoking the Web API");
}
});
});
});
But I got error... How can I implement this functionality?
I cannot get autocomplete to work. I suspect this is because of my declaration of the URL in the Jquery method. How can I fix this issue?
This is the method in the HomeController:
public JsonResult Autocomplete(string term)
{
string connectionString = ConfigurationManager.ConnectionStrings["AbintegroModelContext"].ConnectionString;
List<string> CompanyName = new List<string>();
string query = string.Format("select distinct CompanyName from CompanyTable where CompanyName like '%{0}%'", term);
using (SqlConnection connection = new SqlConnection(connectionString))
{
using (SqlCommand cmd = new SqlCommand(query, connection))
{
connection.Open();
SqlDataReader reader = cmd.ExecuteReader();
while (reader.Read())
{
CompanyName.Add(reader["CompanyName"].ToString());
}
}
}
return Json(CompanyName, JsonRequestBehavior.AllowGet);
}
this is the Index view:
<body>
<script src="~/Scripts/jquery-1.8.2.js"></script>
<script src="~/Scripts/jquery-ui-1.8.24.js"></script>
<script>
$(function () {
$("#CompanyName").autocomplete({
source: function (request, response) {
var param = { companyName: $('#CompanyName').val() };
$.ajax({
url: '#Url.Action("Autocomplete", "Home")',
data: JSON.stringify(param),
datatype: "json",
type: "GET",
contentType: "application/json; charset=utf-8",
dataFilter: function (data) {
response($.map(data.d, function (item) {
return {
value: item
}
}))
},
error: function (XMLHttpRequest, textStatus, errorThrown) {
var err = eval("(" + XMLHttpRequest.responseText + ")");
alert(err.Message)
console.log("Ajax Error!");
}
});
},
minLength: 2 //min legth of textbox input
});
});
</script>
...later on in the same view I have the html helper textbox CompanyName.
#Html.TextBox("CompanyName", null, new { #class = "indexTextbox" })
I haven't tried re-creating this problem on my end.
Have you used your browser's code inspector to see if any errors are returned?
Also you may try placing the jquery code inside a $(document).ready() function to see if that helps.
I get data from Webmethod & it need to bind to a table.But my Jquery function not success.Not call webmethod because of Ajax call error.
My Webmethod is
[WebMethod, ScriptMethod]
public static List<UploadedFiles> GetAllUploadedFiles()
{
List<UploadedFiles> UploadedFilesDetails = new List<UploadedFiles>();
try
{
SqlCommand comGetAllFiles = new SqlCommand("SP_GetAllUploadedFiles", conDB);
comGetAllFiles.CommandType = CommandType.StoredProcedure;
if (conDB.State == ConnectionState.Closed)
conDB.Open();
SqlDataReader rdr = comGetAllFiles.ExecuteReader();
DataTable dt = new DataTable();
dt.Load(rdr);
foreach (DataRow r in dt.Rows)
{
UploadedFilesDetails.Add(new UploadedFiles
{
Id = (int)r["Id"],
UserId =(Guid)r["UserId"],
FilePath = r["FilePath"].ToString(),
Date =(DateTime) r["Date"]
});
}
}
catch(Exception ee)
{
}
finally
{
conDB.Close();
}
return UploadedFilesDetails;
My Ajax Function
<script>
$(function () {
LoadUploadFiles();
});
function LoadUploadFiles() {
var url = '<%=ResolveUrl("WebMethods.aspx/GetAllUploadedFiles") %>';
$.ajax({
url: url,
type: "POST",
dataType: "json",
contentType: "application/json; charset=utf-8",
success: function (Result) {
alert("x");//<-- This alert firing
$.each(Result.d, function (key, value) {
alert(Result.d); //<-- Thisone not firing
$("#uploaddata").append($("<table><tr></tr></table>").val
(value.Id).html(value.FilePath));
});
},
error: function (e, x) {
alert(x.ResponseText);
}
});
}
</script>