RadAjaxManager losing drop down list value after Ajax postback

[Jonathan]

Hi

I am having a problem with our web app on the search page. My setup is we have a Search.aspx where a RadAjaxManager lives.

From there we have SearchPanel.ascx registered on the search page. This control has its own AjaxEventArgs registered to the OnInit using the Seach.aspx RadManager. This event populates drop down lists with values via an onclick event that is registered to the drop down list control. This works perfectly fine on the first request.

The problem I'm having is when i hit the search button we have registered on that page it fires a seperate AjaxEventArgs with a different AjaxEvent command and it loses the values from the drop down list.

I have undertook the work of upgrading our telerik controls from classic to Asp.Net Ajax control collection (Latest Version) and this previously worked but obviously since I can now only have one manager on the page it seems the behaviour has changed when im hooking up multiple AjaxEventArgs to one manager.

Does this behaviour sound like I have setup any part of the AjaxManager incorrectly or can you point me in any direction I can start looking to resolve this issue? If any more information is required please let me know.

Regards,
Jonathan

[Jonathan]

Update

I have discovered that after i hit the search button i lose the values of my dropdown list (Lets call this dropdown list 1) apart from the values of a dropdown list (Lets call this dropdown list 2) that is registered in a different way.

The dropdown list 2 in question has an ajaxRequest associated with it and when i fire that my dropdown list 1 is repopulated.

However, again hitting the search button i lose the values of dropdown list 1 again. The only difference i could spot on dropdown list 2 control is that ViewState is enabled to true and changing this to false was causing me to lose the values of that control as well, after a search button hit.

I thought simply setting viewstate to dropdown list 1 would resolve the problem but the values did not remain.

Can anyone offer any insight into this?

[Jonathan]

Code below - please respond to this request.

Drop List Control

<%@ Control Language="C#" AutoEventWireup="true" EnableViewState="false" CodeBehind="DropDownList.ascx.cs" Inherits="Hexagon.Web.UI.Search.Results.SearchPanelControls.DropDownList" %>
<%@ Register TagPrefix="SearchPanelControls" TagName="Label" Src="~/Search2/SearchPanelControls/Label.ascx" %>
<%@ Register TagPrefix="telerik" Namespace="Telerik.Web.UI" Assembly="Telerik.Web.UI" %>
 
<telerik:RadScriptBlock ID="RadScriptBlock1" runat="server">
<script type="text/javascript">
    var obj = new SearchField('<%= this.ddl.ClientID %>', '<%= this.ID %>', 'DROPDOWN');
    arrSearchInputs.push(obj);
</script>
</telerik:RadScriptBlock>
 
<SearchPanelControls:Label ID="lbl" ControlType="DROPDOWNLIST" runat="server"></SearchPanelControls:Label>
<td class="LeftAligned">
    <asp:DropDownList
        EnableViewState="false"
        ID="ddl" 
        CssClass="MSBox" 
        AutoPostBack="false" 
        CausesValidation="false" 
        runat="server"></asp:DropDownList>
</td>

using System;
using System.Collections;
using System.Configuration;
using System.Data;
using System.Linq;
using System.Text;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Xml.Linq;
//BOs
using Hexagon.BusinessObjects.Context;
using Hexagon.BusinessObjects.Context.User;
using Hexagon.BusinessObjects.DocumentManagement.Search;
using Hexagon.BusinessObjects.DocumentManagement.Statuses;
using Hexagon.BusinessObjects.Context.MilestoneManagement;
//Utilities
using Hexagon.Utilities.State;
//3rd party
using Telerik.Web.UI;
 
namespace Hexagon.Web.UI.Search.Results.SearchPanelControls
{
    public partial class DropDownList : SearchPanelControlBase
    {
        #region Attributes
 
        private SourceType _sourceType = SourceType.UNDEFINED;
		private string _onChangeJS = string.Empty;
 
        #endregion
 
        #region Properties
 
        public SourceType SourceType
        {
            get { return this._sourceType; }
            set { this._sourceType = value; }
        }
 
		public string OnChangeJS
		{
			get { return this._onChangeJS; }
			set { this._onChangeJS = value; }
		}
 
        #endregion
 
        #region Page Life Cycle
 
        protected void Page_Load(object sender, EventArgs e)
        {
			this.EnableViewState = true;
 
            if (!IsPostBack)
            {
                this.InitaliseLabel();
                if (this._dataSource != null)
                {
                    this.DataBind();
                }
                else
                {
                    this.AjaxDataBind();
                }
            }
        }
 
        public void InitialiseAjax(RadAjaxManager radAjaxManager)
        {
            radAjaxManager.AjaxSettings.AddAjaxSetting(radAjaxManager, this.ddl);
        }
        public void InitialiseAjax(RadAjaxManager radAjaxManager, RadAjaxLoadingPanel RadAjaxLoadingPanel)
        {
			radAjaxManager.AjaxSettings.AddAjaxSetting(radAjaxManager, this.ddl, RadAjaxLoadingPanel);
        }
 
        #endregion
 
        #region Helpers
 
        private void InitaliseLabel()
        {
            this.lbl.LabelForClientID   = this.ddl.ClientID;
            this.lbl.ResourceStringsID  = this.ID;
        }
 
        public void AjaxDataBind()
        {
			if (ddl.Items.Count == 0)
			{
				string strAll = this._resourceManager.GetString("all");
				this.ddl.Items.Add(new ListItem(strAll, "ALL"));
				this.ddl.SelectedValue = "ALL";
				this.ddl.Attributes.Add("onclick", "SearchPanelAjaxEvent('AJAXDDLLOAD^" + this.ID + "', true);");
			}
        }
 
        public override void DataBind()
        {
            string strAll = this._resourceManager.GetString("all");
            string strCurrentUser = this._resourceManager.GetString("currentUser");         // Added as fix for case : 14829, pratik patel
            string strCurrentUserOrg = this._resourceManager.GetString("currentUserOrg");   // Added as fix for case : 14829, pratik patel
            this.ddl.Attributes.Clear();
            this.ddl.Items.Clear();
 
            bool bAddCurrentProfileOrg = true;
 
            bool bSelected = false;
            switch (this._sourceType)
            {
                case SourceType.ORGANISATION:
				case SourceType.ORGANISATION_WITHID:
                    #region ORGANISATION
 
                    if (this._dataSource != null)
                    {
                        int _nearestESPType =  ApplicationHelper.CurrentContext.CurrentContainer.Ancestors.NearestESP().ContainerType;
 
                        foreach (SearchEngine.SearchResultInfo info in (SearchEngine)this._dataSource)
                        {
                            ListItem li = new ListItem(info.Name, _sourceType == SourceType.ORGANISATION ? info.Name.ToString() : info.PrimaryKey.ToString());
                            li.Attributes.Add("title", ScriptHelper.EscapeJavascript(info.Name));
                            this.ddl.Items.Add(li);
 
                            if (info.OrgAtCurrentContext == false && ApplicationHelper.CurrentContext.CurrentContainerType != Utilities.ACLObjectType.ObjectType.ENTERPRISE)
                            {
                                if (ApplicationHelper.CurrentContext.CurrentContainerType == Utilities.ACLObjectType.ObjectType.DOCUMENTFOLDER || ApplicationHelper.CurrentContext.CurrentContainerType == Utilities.ACLObjectType.ObjectType.REVISABLESTATICVIRTUALCONTAINER || ApplicationHelper.CurrentContext.CurrentContainerType == Utilities.ACLObjectType.ObjectType.DYNAMICVIRTUALCONTAINER)
                                {
                                    if (_nearestESPType != 2)
                                        li.Attributes.Add("class", "GreyedOut");
                                }
                                else
                                {
                                    li.Attributes.Add("class", "GreyedOut");
                                }
                            }
 
                            if (info.Name == this._value || info.PrimaryKey.ToString() == this._value)
                            {
                                ddl.SelectedValue = li.Value;
                                bSelected = true;
                            }                            
                        }
                    }
                    if (bAddCurrentProfileOrg)
                    {
                        ddl.Items.Add(new ListItem(strCurrentUserOrg, "CurrentUserOrg")); // Added as fix for case : 14829, pratik patel
                        if (!bSelected && this._value.ToLower() == "currentuserorg") // Added as fix for case : 14829, pratik patel
                        {
                            ddl.SelectedValue = "CurrentUserOrg";
                            bSelected = true;
                        }
                    }
                    ddl.Items.Add(new ListItem(strAll, "ALL"));
 
                    #endregion
 
                    break;
                case SourceType.REVISIONSTATUS:
 
                    #region REVISIONSTATUS
 
                    if (this._dataSource != null)
                    {
                        foreach (ItemStatusFinder.ItemStatusInfo its in (ItemStatusFinder)this._dataSource)
                        {
                            ListItem li = new ListItem(its.Name, its.ID.ToString());
                            li.Attributes.Add("title", ScriptHelper.EscapeJavascript(its.Name));
                            this.ddl.Items.Add(li);
 
						    if (!its.Assigned)
                            {
                                li.Attributes.Add("class", "GreyedOut");
                            }
 
                            if (its.ID.ToString() == this._value)
                            {
                                ddl.SelectedValue = li.Value;
                                bSelected = true;
                            }
                        }
                    }
 
                    ddl.Items.Add(new ListItem(strAll, "ALL"));
 
                    #endregion
 
                    break;
 
                case SourceType.PROFILE:
 
                    #region PROFILE
 
                    if (this._dataSource != null)
                    {
                        foreach (ROProfile prof in (ProfileFinder)this._dataSource)
                        {
                           // ListItem li = new ListItem(prof.ProfileName, prof.ProfileID.ToString());
                            ListItem li = new ListItem(prof.UserFriendlyProfileName, prof.ProfileID.ToString());
                            li.Attributes.Add("title", ScriptHelper.EscapeJavascript(prof.UserFriendlyProfileName));
                            this.ddl.Items.Add(li);
 
                            if (prof.ProfileID.ToString() == this._value)
                            {
                                ddl.SelectedValue = li.Value;
                                bSelected = true;
                            }
 
							if (prof.IsRevoked)
							{
								li.Attributes.Add("class", "Revoked");
							}
                        }
                    }
 
                    if (bAddCurrentProfileOrg)
                    {
                        ddl.Items.Add(new ListItem(strCurrentUser, "currentUser"));  // Added as fix for case : 14829, pratik patel
                        if (!bSelected && this._value.ToLower() == "currentuser")     // Added as fix for case : 14829, pratik patel
                        {
                            ddl.SelectedValue = "currentUser";
                            bSelected = true;
                        }
                    }
                    ddl.Items.Add(new ListItem(strAll, "ALL"));
 
                    #endregion
 
                    break;
 
                case SourceType.READSTATUS:
 
                    #region READSTATUS 
 
                    if (this._dataSource != null)
                    {
                        int count = 0;
                        foreach (string name in (string[])this._dataSource)
                        {
                            ListItem li = new ListItem(this._resourceManager.GetString(name.ToLower()), name.ToUpper());
                            li.Attributes.Add("title", ScriptHelper.EscapeJavascript(this._resourceManager.GetString(name.ToLower())));
                            this.ddl.Items.Add(li);
 
                            if (this._value != "")
                            {
                                if (count == int.Parse(this._value))
                                {
                                    ddl.SelectedValue = li.Value;
                                    bSelected = true;
                                }
                            }
 
                            count++;
                        }
                    }
 
                    #endregion
 
                    break;
 
                case SourceType.MILESTONECOMPLETE:
 
                    if (this._dataSource != null)
                    {
                        int count = 0;
                        foreach (string name in (string[])this._dataSource)
                        {
                            ListItem li = new ListItem(this._resourceManager.GetString(name.ToLower()), name.ToUpper());
                            li.Attributes.Add("title", ScriptHelper.EscapeJavascript(this._resourceManager.GetString(name.ToLower())));
                            this.ddl.Items.Add(li);
 
                            if (this._value != "")
                            {
                                if (count == int.Parse(this._value))
                                {
                                    ddl.SelectedValue = li.Value;
                                    bSelected = true;
                                }
                            }
 
                            count++;
                        }
                   }
 
                    break;
 
                case SourceType.WORKFLOWSTATUS:
 
                    #region WORKFLOWSTATUS
 
                    if (this._dataSource != null)
                    {
                        int count = 0;
                        foreach (string name in (string[])this._dataSource)
                        {
                            ListItem li = new ListItem(this._resourceManager.GetString(name.ToLower()), name);
                            li.Attributes.Add("title", ScriptHelper.EscapeJavascript(this._resourceManager.GetString(name.ToLower())));
                            this.ddl.Items.Add(li);
 
                            if (this._value != "")
                            {
                                if (count == int.Parse(this._value))
                                {
                                    ddl.SelectedValue = li.Value;
                                    bSelected = true;
                                }
                            }
 
                            count++;
                        }
                    }
                    
                    ddl.Items.Add(new ListItem(strAll, "ALL"));
 
                    #endregion
 
                    break;
 
                case SourceType.STATE:
 
                    #region STATE
 
                    if (this._dataSource != null)
                    {
                        foreach (ListItem li in (ArrayList)this._dataSource)
                        {
                            li.Attributes.Add("title", ScriptHelper.EscapeJavascript(li.Text));
                            ddl.Items.Add(li);
 
                            if (li.Value == this._value)
                            {
                                ddl.SelectedValue = li.Value;
                                bSelected = true;
                            }
                        }
                    }
                    
                    ddl.Items.Add(new ListItem(strAll, "ALL"));
 
                    #endregion
 
                    break;
 
				case SourceType.OVERDUESTATUS:
 
					#region OVERDUESTATUS
 
					if (this._dataSource != null)
					{
						int count = 0;
						foreach (string name in (string[])this._dataSource)
						{
							ListItem li = new ListItem(this._resourceManager.GetString(name.ToLower()), name.ToUpper());
							li.Attributes.Add("title", ScriptHelper.EscapeJavascript(this._resourceManager.GetString(name.ToLower())));
                            this.ddl.Items.Add(li);
 
							if (this._value != "")
							{
								//if (count == int.Parse(this._value))
                                if (li.Value.ToLower() == this._value.ToLower())
								{
                                    ddl.SelectedValue = li.Value;
									bSelected = true;
								}
							}
 
							count++;
						}
					}
 
					ddl.Items.Add(new ListItem(strAll, "ALL"));
 
					#endregion
 
					break;
                case SourceType.RECIPIENTTYPE:
 
                    #region Recipient Type
 
                    if (this._dataSource != null)
					{
						int count = 0;
						foreach (string name in (string[])this._dataSource)
						{
							ListItem li = new ListItem(this._resourceManager.GetString(name.ToLower()), name.ToUpper());
							li.Attributes.Add("title", ScriptHelper.EscapeJavascript(this._resourceManager.GetString(name.ToLower())));
                            this.ddl.Items.Add(li);
 
							if (this._value != "")
							{
								if (count == int.Parse(this._value))
								{
                                    ddl.SelectedValue = li.Value;
									bSelected = true;
								}
							}
 
							count++;
						}
					}
 
					ddl.Items.Add(new ListItem(strAll, "ALL"));
 
                    #endregion
 
                    break;
 
                case SourceType.UNDEFINED:
 
                    #region UNDEFINED
 
                    ddl.Items.Add(new ListItem(strAll, "ALL"));
 
                    #endregion
 
                    break;
 
            }
 
			// default selection
            if (!bSelected)
            {
                ddl.SelectedValue = "ALL";
            }
 
			// onchange js
			if (_onChangeJS != string.Empty)
			{
				ddl.Attributes.Add("onchange", _onChangeJS);
			}
        }
 
        #endregion
 
    }
}

Ajax Request wired up to the current pages ajax manager

protected override void OnInit(EventArgs e)
		{
			RadAjaxManager manager = RadAjaxManager.GetCurrent(Page);
			manager.AjaxRequest += new RadAjaxControl.AjaxRequestDelegate(RadAjaxManager0_AjaxRequest);
		}

protected void RadAjaxManager0_AjaxRequest(object sender, AjaxRequestEventArgs e)
		{
			string[] args = e.Argument.Split('^');
 
			switch (args[0])
			{
				case "CLEARITEMPICKER":
					#region Clear Item Pickers
 
					switch (args[1])
					{
						case "SearchIn":
							SimpleTreeViewHelper.SetCheckedTreeNodes(args[1], new ArrayList());
							SimpleTreeViewHelper.SetCheckedTreeNodesToShow(args[1], new ArrayList());
							break;
					}
 
					#endregion
					break;
				case "REBINDCHILD":
					#region Rebind Child
 
					SearchPanelControls.NestedDropDownList nestedDDL = (SearchPanelControls.NestedDropDownList)this.FindControlRecursive(this.Page, args[1]);
					// TODO - this should be set depending on the type, only need it because there's no finder
					nestedDDL.DataSource = MilestoneScheduleDataSource;
					nestedDDL.RebindChild(args[2]);
 
					if (bool.Parse(ConfigurationManager.AppSettings["AjaxifySearchDDls"].ToString()))
					{
						this.AjaxDDLLoad("", args[4], bool.Parse(args[3]));
					}
 
					#endregion
					break;
				case "SAVESEARCH":
					#region Save Search
 
					this.DoSaveSearch(args[1]);
 
					if (bool.Parse(ConfigurationManager.AppSettings["AjaxifySearchDDls"].ToString()))
					{
						this.AjaxDDLLoad("", args[2], false);
					}
 
					#endregion
					break;
				case "AJAXDDLLOAD":
					#region Ajax DDL Load
 
					this.AjaxDDLLoad(args[1], args[2], false);
 
					#endregion
					break;
			}
		}

[Maria Ilieva]

Hi Jonathan,

Could you please let me know if you have an Ajax setting in which the problematic dropdown liast1 is updated by the mentioned search button. If not could you please add such and verify if this makes a difference.

Greetings,
Maria Ilieva
the Telerik team

[Jonathan]

Hi Maria

Thank you for your reply.

I checked and I did not have an ajax setting for the scenario you mentioned.

I added one and the drop down list still lost its values after the ajax event for the button click.

Regards,
Jonathan

[Maria Ilieva]

Hi,

From the provided code I noticed that you are populating the problematic DropDown on AjaxRequest in case the search button is clicked. Could you please debug the application locally and verify of the mentioned event is fired and if the code is entering in the needed condition to update the control.

Greetings,
Maria Ilieva
the Telerik team