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OnSelectedIndexChanged fired incorrectly after refreshing page in Firefox

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ComboBox

This is a migrated thread and some comments may be shown as answers.

Meng asked on 08 Jun 2015, 01:56 PM

Hi there,

The RadcomboBox OnSelectedIndexChanged event fired unexpected after I refresh page in firefox, however, it is working fine in IE and Chrome. Here is my code and scenario. Please help. Thank you very much.

1 Use firefox to open the page

2 Select value from the first ComboBox

3 Select value from the second ComboBox

4 Refresh Page

5 Click the "Explore" button on the page, the OnSelectedIndexChanged event of the first RadComboBox got fired in Firefox (working fine in IE and Chrome).

Default.aspx:

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="Default" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns='http://www.w3.org/1999/xhtml'>

<head runat="server">

<title>Telerik ASP.NET Example</title>

<link rel="stylesheet" type="text/css" href="styles.css" />

</head>

<body>

<form id="form1" runat="server">

<telerik:RadScriptManager runat="server" ID="RadScriptManager1" />

<telerik:RadFormDecorator ID="FormDecorator1" runat="server" />

<div class="qsf-demo-canvas">

<div class="continents">

<telerik:RadComboBox ID="RadComboBox1" runat="server" Width="186px"

AutoPostBack="true" Filter="Contains" datatextfield="Name" datavaluefield="ID"

OnDataBound="ddlBox1_DataBound" OnSelectedIndexChanged="RadComboBox1_SelectedIndexChanged">

</telerik:RadComboBox>

</div>

<div class="countries">

<telerik:RadComboBox ID="RadComboBox2" runat="server" Width="186px"

AutoPostBack="true" Filter="Contains" datatextfield="Name" datavaluefield="ID"

OnDataBound="ddlBox2_DataBound" OnSelectedIndexChanged="RadComboBox2_SelectedIndexChanged">

</telerik:RadComboBox>

</div>

<div>

<telerik:RadGrid ID="RadGrid1" runat="server" AllowPaging="True" CellSpacing="0" AllowSorting="true"

GridLines="None" Width="800px">

<ClientSettings>

<Selecting AllowRowSelect="true" />

</ClientSettings>

<MasterTableView AutoGenerateColumns="False" DataKeyNames="ID">

<Columns>

<telerik:GridBoundColumn DataField="ID" DataType="System.String"

HeaderText="StateID" ReadOnly="True" SortExpression="ID" UniqueName="ID">

</telerik:GridBoundColumn>

<telerik:GridDateTimeColumn DataField="Name" DataType="System.String"

HeaderText="Name" SortExpression="Name" UniqueName="Name">

</telerik:GridDateTimeColumn>

</Columns>

</MasterTableView>

<FilterMenu EnableImageSprites="False">

</FilterMenu>

</telerik:RadGrid>

</div>

<p class="buttons">

<asp:Button ID="Button1" runat="server" Text="Explore" OnClick="Button1_Click" />

</p>

<div class="result">

<asp:Label runat="server" ID="Literal1" />

</div>

<telerik:RadAjaxManager ID="RadAjaxManager1" runat="server">

<AjaxSettings>

<telerik:AjaxSetting AjaxControlID="RadComboBox1">

<UpdatedControls>

<telerik:AjaxUpdatedControl ControlID="RadComboBox2" />

<telerik:AjaxUpdatedControl ControlID="RadGrid1" />

</UpdatedControls>

</telerik:AjaxSetting>

<telerik:AjaxSetting AjaxControlID="RadComboBox2">

<UpdatedControls>

<telerik:AjaxUpdatedControl ControlID="RadGrid1" />

</UpdatedControls>

</telerik:AjaxSetting>

</AjaxSettings>

</telerik:RadAjaxManager>

</form>

</body>

</html>

Code behind file:

using System;

using System.Web;

using System.Web.UI;

using System.Web.UI.WebControls;

using System.Linq;

using System.Data;

using System.Data.SqlClient;

using System.Configuration;

using System.Web.Security;

using System.Collections.Generic;

using System.Web.UI.WebControls.WebParts;

using System.Web.UI.HtmlControls;

using Telerik.Web.UI;

public partial class Default : System.Web.UI.Page

{

public class State

{

public String ID { get; set; }

public String Name { get; set; }

}

public class City

{

public String ID { get; set; }

public String Name { get; set; }

public String StateID { get; set; }

}

public List<State> GetStateList()

{

List<State> _list = new List<State>();

State d1 = new State();

d1.Name = "AB";

d1.ID = "1";

State d2 = new State();

d2.Name = "BC";

d2.ID = "2";

State d3 = new State();

d3.Name = "ON";

d3.ID = "3";

_list.Add(d1);

_list.Add(d2);

_list.Add(d3);

return _list;

}

public List<City> GetCityList(String _stateID)

{

List<City> _list = new List<City>();

List<City> _newList = new List<City>();

City c1 = new City();

c1.Name = "Calgary";

c1.ID = "1";

c1.StateID = "1";

City c2 = new City();

c2.Name = "Edmonton";

c2.ID = "2";

c2.StateID = "1";

City c3 = new City();

c3.Name = "Vancouver";

c3.ID = "3";

c3.StateID = "2";

City c4 = new City();

c4.Name = "Victoria";

c4.ID = "4";

c4.StateID = "2";

City c5 = new City();

c5.Name = "Toronto";

c5.ID = "5";

c5.StateID = "3";

City c6 = new City();

c6.Name = "Ottawa";

c6.ID = "6";

c6.StateID = "3";

_list.Add(c1);

_list.Add(c2);

_list.Add(c3);

_list.Add(c4);

_list.Add(c5);

_list.Add(c6);

var _result = _list.Where(t => t.StateID == _stateID);

foreach (var _item in _result)

{

City d = new City();

d.ID = _item.ID;

d.StateID = _item.StateID;

d.Name = _item.Name;

_newList.Add(d);

}

return _newList;

}

protected void Page_Load(object sender, EventArgs e)

{

if (!Page.IsPostBack)

LoadBox1();

}

protected void RadComboBox1_SelectedIndexChanged(object sender, RadComboBoxSelectedIndexChangedEventArgs e)

{

if (e.Value != String.Empty)

{

LoadBox2(e.Value);

List<State> _test = new List<State>();

RadGrid1.DataSource = _test;

RadGrid1.DataBind();

}

protected void RadComboBox2_SelectedIndexChanged(object sender, RadComboBoxSelectedIndexChangedEventArgs e)

{

if (e.Value != String.Empty)

{

LoadGrid();

}

public void LoadGrid()

{

RadGrid1.DataSource = GetStateList();

RadGrid1.DataBind();

}

protected void LoadBox1()

{

RadComboBox1.DataSource = GetStateList();

RadComboBox1.DataBind();

}

protected void LoadBox2(string _stateID)

{

RadComboBox2.DataSource = GetCityList(_stateID);

RadComboBox2.DataBind();

}

protected void ddlBox1_DataBound(object sender, EventArgs e)

{

var combo = (RadComboBox)sender;

combo.Items.Insert(0, new RadComboBoxItem("Please Select", String.Empty));

RadComboBox2.Items.Insert(0, new RadComboBoxItem("Please Select", String.Empty));

}

protected void ddlBox2_DataBound(object sender, EventArgs e)

{

var combo = (RadComboBox)sender;

combo.Items.Insert(0, new RadComboBoxItem("Please Select", String.Empty));

}

protected void Button1_Click(object sender, EventArgs e)

{

//Literal1.Text = string.Empty;

}

4 Answers, 1 is accepted

answered on 16 Jun 2015, 10:04 AM

Hello,

You can still use the RadAjaxManager to update other controls on your page. You can remove only the AjaxSetting for the two RadComboBox if you are going to be refreshing the page, as in this scenario refreshing the page will cause the SelectedIndexChanged event to fire. This is the controls default behavior and can be noticed in our Cascading ComboBoxes demo as well.

Regards,
Ivan Danchev
Telerik

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