Localization: listbox

Showing posts with label listbox. Show all posts

Wednesday, March 28, 2012

List controls not refreshing in UpdatePanels

I'm trying to figure out why when I click Remove on any listbox the postback doesn't refresh the listbox to show the change. I thought that every updatepanel refreshes. If this is so, then why isn't my listbox automatically reloading the updated list after I remove an item? I end up having to refresh the whole page manually in order to see any removed items from my listboxes

<%@dotnet.itags.org. Control Language="vb" AutoEventWireup="false" CodeBehind="Main.ascx.vb" Inherits="xxxx" %>

<asp:scriptmanager id="ScriptManager1" runat="server" />

<tr>

</tr>

<tr>

<asp:label id="GeneralInformationHeader" runat="server" />

</td>

</tr>

<tr>

</tr>

<tr>

<asp:label id="Program" runat="server" />

</td>

<asp:dropdownlist id="ddlPrograms" runat="server" width="300px" />

</td>

</tr>

<tr>

</tr>

<tr>

<asp:label id="Cuent" runat="server" />

</td>

<asp:updatepanel id="CuentUpdatePanel" runat="server">

<asp:listbox id="lbCuent" runat="server" width="214px" /><br />

</contenttemplate>

</asp:updatepanel>

</td>

</tr>

<tr>

</tr>

<tr>

<asp:label id="ApdCs" runat="server" />

</td>

<asp:updatepanel id="ApdCsUpdatepanel" runat="server">

<asp:listbox id="lbApdCs" runat="server" width="214px" /><br />

<asp:button id="btnAddApdCs" runat="server" width="63px" />

<asp:button id="btnRemoveApdCs" runat="server" width="83px" />

</td>

</tr>

<asp:panel id="pnlAddApdCs" runat="server" visible="false">

<tr>

<td>

</td>

<td>

<table>

<tr>

<td>

<asp:dropdownlist id="ddlAddApdCs" runat="server" width="90px" />

</td>

<td>

<asp:button id="btnInsertApdCs" runat="server" width="50px" />

</td>

</tr>

</table>

</td>

</tr>

</asp:panel>

</contenttemplate>

</asp:updatepanel>

<tr>

</tr>

<tr>

<asp:label id="FtyMang" runat="server" />

</td>

<asp:listbox id="lbFtyMang" runat="server" width="214px" />

</td>

</tr>

<tr>

</tr>

<tr>

<asp:label id="lHDee" runat="server" />

</td>

<asp:updatepanel id="HDee" runat="server">

<asp:listbox id="lbHDee" runat="server" width="214px" /><br />

<asp:button id="btnAddHDee" runat="server" width="63px" />

<asp:button id="btnRemoveHDee" runat="server" width="83px" />

</contenttemplate>

</asp:updatepanel>

</td>

</tr>

<asp:panel id="pnlAddHDee" runat="server" visible="false">

<tr>

<td>

</td>

<td>

<table>

<tr>

<td>

<asp:dropdownlist id="ddlAddHDee" runat="server" width="90px" />

</td>

<td>

<asp:button id="btnInsertHDee" runat="server" width="50px" />

</td>

</tr>

</table>

</td>

</tr>

</asp:panel>

<tr>

</tr>

<tr>

<asp:label id="Ces" runat="server"></asp:label>

</td>

<asp:updatepanel id="CesUpdatepanel" runat="server">

<asp:listbox id="lbCes" runat="server" width="214px" /><br />

<asp:button id="btnAddCes" runat="server" width="63px" />

<asp:button id="btnRemoveCes" runat="server" width="83px" />

</contenttemplate>

</asp:updatepanel>

</td>

</tr>

<asp:panel id="pnlAddCes" runat="server" visible="false">

<tr>

<td>

</td>

<td>

<table>

<tr>

<td>

<asp:dropdownlist id="ddlAddCes" runat="server" width="90px" />

</td>

<td>

<asp:button id="btnInsertCes" runat="server" width="50px" />

</td>

</tr>

</table>

</td>

</tr>

</asp:panel>

</table>

</td>

<asp:updatepanel id="FtyUpdatePanel" runat="server">

<tr>

</tr>

<tr>

<asp:label id="FtyHeader" runat="server" />

</td>

</tr>

<tr>

</tr>

<tr>

<asp:label id="RealName" runat="server" />

</td>

</tr>

<tr>

<tr>

<td>

<asp:label id="lblFirstName" runat="server" />

</td>

<asp:textbox id="FirstName" runat="server" width="150px" />

</td>

<td>

<asp:label id="lblLastName" runat="server" />

</td>

<asp:textbox id="LastName" runat="server" width="150px" />

</td>

</tr>

</table>

</td>

</tr>

<tr>

</tr>

<tr>

<asp:label id="Address" runat="server" />

</td>

</tr>

<tr>

<tr>

<td>

<asp:label id="lblFtyStreet" runat="server"></asp:label>

</td>

<asp:textbox id="FtyStreet" runat="server" width="340px" />

</td>

</tr>

<tr>

<asp:label id="lblFtyCity" runat="server"></asp:label>

</td>

<asp:textbox id="FtyCity" runat="server" width="100px" />

</td>

<asp:label id="lblFtyState" runat="server" />

</td>

<td>

<asp:dropdownlist id="FtyStateList" runat="server" width="50px" />

</td>

<asp:label id="lblFtyZip" runat="server" />

</td>

<asp:textbox id="FtyZip" runat="server" width="100px" />

</td>

</tr>

</table>

</td>

</tr>

<tr>

</tr>

<tr>

<td>

<asp:label id="Phone" runat="server" />

</td>

<td>

<asp:textbox id="AreaCode" runat="server" width="53px" />

<asp:textbox id="Prefix" runat="server" width="58px" />

<asp:textbox id="Suffix" runat="server" width="68px" />

</td>

</tr>

</table>

</td>

</tr>

<tr>

</tr>

<tr>

<asp:label id="Shipping" runat="server" />

</td>

</tr>

<tr>

<td>

</td>

<tr>

<td>

<asp:label id="lblShippingStreet" runat="server" />

</td>

<asp:textbox id="ShippingStreet" runat="server" width="340px" />

</td>

</tr>

<tr>

<asp:label id="lblShippingCity" runat="server" />

</td>

<asp:textbox id="ShippingCity" runat="server" width="126px" />

</td>

<asp:label id="lblShippingState" runat="server" />

</td>

<td>

<asp:dropdownlist id="ShippingStateList" runat="server" width="50px" />

</td>

<asp:label id="lblShippingZip" runat="server" />

</td>

<asp:textbox id="ShippingZip" runat="server" width="100px" />

</td>

</tr>

<tr>

</td>

</tr><tr>

<td>

</td>

<asp:button id="btnUpdateFPenalInfo" runat="server" width="60px" />

</td>

</tr>

</table>

</td>

</tr>

<tr>

</tr>

<tr>

<asp:label id="CouTauder" runat="server" />

</td>

</tr>

<tr>

</tr>

<tr>

<tr>

<asp:label id="LastCourse" runat="server" />

</td>

<asp:label id="LatSsionValue" runat="server"/>

</td>

</tr>

<tr>

<asp:label id="LatSsion" runat="server" />

</td>

<asp:label id="LatSsionValue" runat="server" />

</td>

</tr>

<tr>

<asp:label id="MisSeions" runat="server"/>

</td>

<asp:label id="MisSeionsValue" runat="server" />

</td>

</tr>

<tr>

</td>

</tr>

<tr>

<asp:label id="CourTt" runat="server" />

<br />

</td>

</tr>

<tr>

<asp:gridview id="CourTtList" runat="server" />

</td>

</tr>

</table>

</td>

</tr>

</table>

</contenttemplate>

</asp:updatepanel>

</td>

</tr>

</table>

Hello,

How do you get the data into the listbox? Try this:
for example the list box inside this updatePanel

<asp:updatepanel id="CuentUpdatePanel" runat="server">
<contenttemplate>
<asp:listbox id="lbCuent" runat="server" width="214px" /><br />
</contenttemplate>
</asp:updatepanel>

After you click Remove, for sure you have to call a function right? In that function, also call: CuentUpdatePanel.Update()
This will update the UpdatePanel ... and if your list box uses a ObjectDataSource ... example below

<asp:updatepanel id="CuentUpdatePanel" runat="server">
<contenttemplate>
<asp:listbox id="lbCuent" runat="server" DataSourceID="GetListITems" width="214px" /><br />
</contenttemplate>
</asp:updatepanel>

then in your function, you do this: lbCuent.Databind();

Hope it helps ... by the way, next time don't bother post all of your HTML in here, too much, waste your time. =) just the part that you have problem is enough already ... and the code behind that is related to it ... Cheers

The problem is that I didn't rebind my listbox after whatever event (insert, delete, etc.)

I didn't even have to call the .Update() manually, it all works fine now after the obvious missing rebind of my listbox controls

ListBox - SelectedIndexChanged Problem

I have a data bound ListBox. When I click on an item it fires the SelectedIndexChanged event like it should, however, NONE of the items are marked as 'selected' in the event method. Any ideas?

Doh! Found the solution! I was rebinding the data to the listbox on postback and apparently this is what was causing the problems. I wrapped the data binding code in an IF statement that executes if IsPostBack is false.

This might be good to know for others out there.

ListBox and DragPanelExtender

ListBox is rendered last so z-index has no effect.

Can a use any (html) trick to get the object attach to the DragPanelExtender (asp:panel) moving over the ListBox?

Huh? [:^)]

My reading of thez-index documentation makes me think it would help here - you're saying it doesn't?

no z-index fails
On IE (at least) ListBox, TextBox, and ComboBox are actual windows controls placed by the browser. Since they are separate HWNDs ordered above the browsers rendering surface HWND< they can't be z-ordered under other elements, unfortuntately.
I am running into this right now. The DragPanelExtender is pretty much useless unless you don't have any controls with Hwnds on your page (which is very rare for me.) Granted I could leave it, but it does not look professional at all.

The frustrating thing is that the PopupControlExtender DOES get layered above all other controls. So I think it is an opportunity for the Atlas team to change the DragPanelExtender to have whatever it is the PopupControlExtender has that allows it to be on top.

If I come up with a solution, I will post it. I think there should be a way around this if the PopupControlExtender is able to show HTML content on top of an asp:DropDownList.

can i use css adapters to make z-index to work for DropDownList ...

I found another page have some hints to doing so, I think it should also implement to Modal Popup

http://dotnetjunkies.com/WebLog/jking/archive/2003/10/30/2975.aspx

<html>
<head>
<script>
function DivSetVisible(state)
{
var DivRef = document.getElementById('PopupDiv');
var IfrRef = document.getElementById('DivShim');
if(state)
{
DivRef.style.display = "block";
IfrRef.style.width = DivRef.offsetWidth;
IfrRef.style.height = DivRef.offsetHeight;
IfrRef.style.top = DivRef.style.top;
IfrRef.style.left = DivRef.style.left;
IfrRef.style.zIndex = DivRef.style.zIndex - 1;
IfrRef.style.display = "block";
}
else
{
DivRef.style.display = "none";
IfrRef.style.display = "none";
}
}
</script>
</head>
<body>
<form>
<select>
<option>A Select Box is Born ...</option>
</select>
</form>
<div
id="PopupDiv"
style="position:absolute; top:25px; left:50px; padding:4px; display:none; background-color:#000000; color:#ffffff; z-index:100">
... and a DIV can cover it up<br>through the help of an IFRAME.
</div>
<iframe
id="DivShim"
src="http://pics.10026.com/?src=javascript:false;"
scrolling="no"
frameborder="0"
style="position:absolute; top:0px; left:0px; display:none;">
</iframe>
<br>
<br>
<a href="http://links.10026.com/?link=#" onclick="DivSetVisible(true)">Click to show DIV.</a>
<br>
<br>
<a href="http://links.10026.com/?link=#" onclick="DivSetVisible(false)">Click to hide DIV.</a>
</body>
</html>

Listbox Client Controls?

I noticed that there's not a lot of support for listboxes on the client side. There's only the Web.UI.Select object, but it's pretty sparse in terms of functionality (ie. no clear or add methods).

Also haven't seen any examples of DataBinding a listbox - all the sample seem to work on ListView controls and binding to individual label elements, which isn't quite possible with lists.

Anybody have an example on how to bind a list using ATLAS declarative or script code?

+++ Rick --

Hi,

here's an example of a Web.UI.Select control bound to a DataTable. Hope it helps.

<%@. Page Language="C#" %> <%@. Import Namespace="System.Data" %> <%@. Import Namespace="System.Web.Services" % <script runat="server"> [WebMethod] public DataTable GetDummyDataTable() { DataTable dt = new DataTable(); dt.Columns.Add(new DataColumn("ID", typeof(int))); dt.Columns.Add(new DataColumn("Name", typeof(String))); dt.Columns.Add(new DataColumn("LastName", typeof(String)));

dt.Rows.Add(1, "John", "Doe"); dt.Rows.Add(2, "John", "Smith");

return dt; } </script <!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>ListBox Databinding Example</title> </head> <body> <form id="form1" runat="server"> <atlas:ScriptManager ID="sm" runat="server" /> <div> <select id="myListBox"></select> </div> <div> <span>Selected Value is </span> <span id="myLabel"></span> </div> </form> <script type="text/javascript"> function populateList() { PageMethods.GetDummyDataTable(onGetComplete); } function onGetComplete(result) { var myListBox = Web.Application.findObject('myListBox'); myListBox.set_data(result); } </script> <script type="text/xml-script"> <page> <components> <select id="myListBox" textProperty="LastName" valueProperty="ID" firstItemText="Make Your Selection" /> <label id="myLabel"> <bindings> <binding dataContext="myListBox" dataPath="selectedValue" property="text" /> </bindings> </label> <application load="populateList" /> </components> </page> </script> </body> </html>

Thanks Garbin - fantastic!

Your example and some comments from other post have helped me see more of Atlas outside of the server controls.

Monday, March 26, 2012

ListBox control with AJAX

HI,

I have three listboxes on a .aspx 2.0 Framework web page. When selection(s) are made in 1st list box the next two list boxes will change accordingly, and when selection(s) are made in 2nd listbox third list box will change, and this can be other way around. My problem is how do i apply Atlas toolkit's extenders to this, or how do i impletement this with ASP.NET AJAX. Any help is really really appreciated.

sirulu

Hi All,

I am also having the same problem.

I am implementing the AJAX Toolkit control in web application.
In my web application i have the folowing scenario:

Select Country from Dropdownlist

Select State from Dropdownlist

Select multiple Cities from Listbox

But i am not able to use List Box control with the AJAX cascading drop down extender.

Please let me know how to use List Box control with the AJAX cascading drop down extender.

Thanks in advance.

Regards,
Sudhir Kumar

Hi All,

I am implementing the AJAX Toolkit control in web application.
In my web application i have the folowing scenario:

Select Country from Dropdownlist

Select State from Dropdownlist

Select multiple Cities from Listbox

But i am not able to use List Box control with the AJAX cascading drop down extender.

Please let me know how to use List Box control with the AJAX cascading drop down extender.

Thanks in advance.

Regards,
Sudhir Kumar

ListBox does not preserve selected items after using UpdatePanel

Hi there,

I have a ListBox with Multiple Selection feature. After I click the Button on the form, I should process the selected items in the ListBox. The code works fine but after I add the ListBox in an UpdatePanel, it does not preserve selected items.

Any suggestions?

Thanks,
Mosh

use hidden fields.
function addItemstoHiddenField(){
var lbPlantDest = document.getElementById("lbPlantDest");
var lbSalesDest = document.getElementById("lbSalesDest");
var lbPlantDest = document.getElementById("lbPlantSrc");
var lbSalesDest = document.getElementById("lbSalesSrc");
var hdnPlantAccess = document.getElementById('hdnPlantAccess');
var hdnSalesAccess = document.getElementById('hdnSalesAccess');
var hdnPlantAccess = document.getElementById('hdnSrcPlantAccess');
var hdnSalesAccess = document.getElementById('hdnSrcSalesAccess');
for (i = lbPlantDest.options.length - 1; i >= 0; i--) {
hdnPlantAccess.value = hdnPlantAccess.value + lbPlantDest.options[i].value + ',';
}
for (i = lbSalesDest.options.length - 1; i >= 0; i--) {
hdnSalesAccess.value = hdnSalesAccess.value + lbSalesDest.options[i].value + ',';
}
for (i = lbPlantSrc.options.length - 1; i >= 0; i--) {
hdnSrcPlantAccess.value = hdnSrcPlantAccess.value + lbPlantSrc.options[i].value + ',';
}
for (i = lbSalesSrc.options.length - 1; i >= 0; i--) {
hdnSrcSalesAccess.value = hdnSrcSalesAccess.value + lbSalesSrc.options[i].value + ',';
}
}

ListBox error with UpdatePanel

Using a listbox in an update panel with visible= false and AutoPostBack=true causes an error in the foloiwng code below. If I remove either the AutoPostBack and instead use a button to PostBack it works fine or if I remove the Visible it works fine. My workaround is to set the style of the listbox to display:none instead of using Visible.

I'm using the June CTP

<formid="form1"runat="server">
<atlas:ScriptManagerID="scriptManager"runat="server"EnablePartialRendering="true"/>
<div>
<atlas:UpdatePanelID="upListBox"runat="server">
<ContentTemplate>
<asp:ButtonID="Button1"runat="server"Text="Button"OnClick="AddListItems"/>
<asp:ListBoxID="ListBox1"runat="server"OnSelectedIndexChanged="ListBox1_SelectedIndexChanged"Visible="false"AutoPostBack="true">
<asp:ListItemText="one"/>
<asp:ListItemText="two"/>
<asp:ListItemText="three"/>
</asp:ListBox>
</ContentTemplate>
</atlas:UpdatePanel>
</div>
</form>

CODEBEHIND

publicpartialclassDefault2 : System.Web.UI.Page
{
protectedvoid ListBox1_SelectedIndexChanged(object sender,EventArgs e)
{
ListBox1.Visible =false;
}

protectedvoid AddListItems(object sender,EventArgs e)
{
ListBox1.Visible =true;
}
}

Hi,

there's an issue with the UpdatePanel and the __doPostBack function that prevents it to be injected on the page if it is required by a control inside an UpdatePanel.

The solution is to force the server to drop the __doPostBack function. Add this statement in the Page_Load method:

Page.ClientScript.GetPostBackEventReference(this, String.Empty);

listbox in updatepannel takes to long

Hello, I have an updatePanel and inside of it i have textbox, listbox and div. And it all works perfecly if in the listbox i have to 100 rows. But in few cases i have arround 6000 rows. The problem occures when i select a row from the lisbox with 6000 rows and I'm tryning to put some message into the Div. It assignes the InnerHtml of the div and waits for about 1 minute with 100% processor activity and then it displays the div content. How can i shorten this time? Any sugestions?

Thanks

The UpdatePanel passes the ViewState for the whole page each time you do this, not to mention it sounds like 6000 records are being rebound. Remember the whole UpdatePanel needs to update... A better approach would to be use something like PageMethods to get the message (seehttp://encosia.com/index.php/2007/07/11/why-aspnet-ajax-updatepanels-are-dangerous) and then fill the DIV client-side.

-Damien

See the following thread and side threads for a long discussion of the problem and code that will cut the update time to milliseconds if your listbox is simple.

http://forums.asp.net/p/1065352/1540804.aspx

There are other ways of doing it as Damien suggested, but most of them involve the PageRequestManager (http://www.asp.net/AJAX/Documentation/Live/ClientReference/Sys.WebForms/PageRequestManagerClass/default.aspx) as the best solution.

http://forums.asp.net/t/1065004.aspx

Actualy I solved it with this link:

http://encosia.com/index.php/2007/07/13/easily-refresh-an-updatepanel-using-javascript/

ListBox not raising event or makes full postBack

I have a ListBox that needs to be updated depending on selections made on another ListBox. The problem I have is that theSelectedIndexChanged event is not raised. If I put AutoPostback="True" (which worked in my little test app that I created first), it performs a full PostBack.

Has anybody experienced something like this? Any ideas a more than welcome.

Hi,

Have you add the eventhandler to your listbox?
<asp:ListBoxID="ListBox1"runat="server"OnSelectedIndexChanged="ListBox1_SelectedIndexChanged">

Sure I did. And have something in the handler just to make sure the second ListBox is updated.

Does a single update panel contains both the listbox. If the parent listbox is outside the update panel then create a AsyncPostbackTrigger and assign that listbox as control.

Of course I added Triggers. These are basic things I need to do to get the AJAX part working.

Still can't figure out what is wrong.

listbox ondblclick attribute

I am trying to invoke a listboxes double click attribute to utilize the Ajax.Net functionality.

I have a listbox in an UpdatePanel, and using the OnSelectedIndexChanged event I successfully perform client side actions using Ajax.
I now want to perform an action when a user double clicks on an item of the listbox. (remove this item)

I tried copying the OnSelectedIndexChanged attribute value generated by dot net and adding it through the code:

lbMyListBox.Attributes.Add("ondblclick","javascript:setTimeout('__doPostBack(\\'DoubleClick\\',\\'\\')', 0)");

This however keeps causing a page post back.
Is it possible to use the double click attribute?
I have searched everywhere without much luck

TIA

You will need to subclass the ListBox control and create the ondblclick event for postback usage... and remove the existing onSelectedIndexChanged event. This topic deals with fairly advanced .Net web control programming.

Here's an example that is quick and dirty... and does not fully take care of all possible scenarios.

public class MyListBox : ListBox, IPostBackEventHandler, IPostBackDataHandler {public event EventHandler OnDoubleClick;#region IPostBackEventHandler Membersvoid IPostBackEventHandler.RaisePostBackEvent(string eventArgument) {if (eventArgument =="ondblclick") {if (OnDoubleClick !=null)this.OnDoubleClick(this, EventArgs.Empty); } }#endregion protected override void OnPreRender(EventArgs e) {base.OnPreRender(e);this.Attributes.Add("ondblclick", Page.ClientScript.GetPostBackEventReference(this,"ondblclick")); }protected override void Render(HtmlTextWriter writer) {//Here we will remove the onchange event through string manipulation. StringWriter sw =new StringWriter(); HtmlTextWriter newWriter =new HtmlTextWriter(sw);base.Render(newWriter); sw.Flush();string html = sw.ToString();int indexofOnChg=html.IndexOf("onchange=\""); sw.Close(); html = html.Remove(indexofOnChg,html.IndexOf(" ", indexofOnChg) - indexofOnChg); writer.Write(html); } }

Thanks for your advice

Will give it a wirl

ListBox Question For ajax guru....

ok, I may be pushing the limits of whats possible with the ajax listbox, but I'm curious...

Is it possible to populate one listbox with the SELECTED contents of another listbox. ie I have a list box of many subjects the user can select, I want all the subjects the use selects to populate the 2nd listbox, then in the 2nd listbox the user can select a primary subject.

The roadblock I see with this is that that the asp:listbox control doesn't have an onclientclick property,

this could be easily achieved a server side function that chose the selected index from listbox1 and added and item to listbox2 (using ajax).

refer my article.

i have used dropdownboxes for this.

http://www.codeproject.com/Ajax/dropdown_box_using_ajax.asp

Thanks for the quick reply. I was actually curious if there was a way to do this with ASP AJAX rather than a full blown Javascript implementation.

bbaxter:
The roadblock I see with this is that that the asp:listbox control doesn't have an onclientclick property,

I guess you already have an idea about how to achieve what you need if this property is available. As far as I know, you can use onchange event for the list to get a similar function.

To add it, you may use the following code: ListBox1.Attributes.Add("onchange", "a function");

Hope this helps.

Listbox selections to update secondary listbox items

Good Afternoon,

I am extremely new to the Atlas functionality, and am trying to address some customer requests using Atlas. Two listboxes, Category and SubCategory, are initially rendered on the page with all distinct values. My question is how to update the SubCategory listbox when items have been selected in the Category listbox. I have tried to include a parameter for the selection of the SubCategory items, but the list initially is rendered with no items since the parameter value is not assigned.

Any help, insight, or suggestions is greatly appreciated. Also, any suggestions on best practices is also welcome regarding controls utilizing Atlas (for example, using a dataset to populate the listbox versus going directly against the SQL tables).

Thank you,

Erik

Hi,

It sounds like the CascadingDropDown control in this toolkit may be the answer to your questions.

http://atlas.asp.net/atlastoolkit/CascadingDropDown/CascadingDropDown.aspx

Regards

Thank you for the response. Is there any way to utilize a listbox instead of a drop down? Currently, the users can select multiple items from the list.

Hi,

Could you initially populate the subcategory box in the page_load event (when not Page.Ispostback), then have the list updated with a control event parameter on the Category Listbox.

Hope this helps

ListSearchExtender error - System.InvalidOperationException: Extender controls may not be

I created a custom web control (ListSearchControl) using the ListBox and ListSearchExtender control. I added this control to another custom control which is dynamically added to a page. The page ahs a ScriptManager tag before any other controls and inside Form tag. The control works fine on page laod, but gives an error on post back - "System.InvalidOperationException: Extender controls may not be registered after PreRender".

I tried using the same custom control((ListSearchControl) adding it to the page directly and it works fine even on postback.

Is there any way to get out of the error in the first case, or is there a known problem with using Control toolkit extenders being added dynamically on the page?

Hi,

Please try the workaround in this thread : http://forums.asp.net/t/1160803.aspx

Nai-Dong Jin - MSFT:
Hi,

From your description, it seems that while you are usingASP.NET AJAX Toolkit with your controls, you'll get a message whichsays "Extender controls may not be registered after PreRender", right?
For this kind of issue, one workaround is to call the baseOnPreRender method before declaring your controls while overriding theOnPreRender method on the page where you had the new extender control.See the following code snippet:
protected override void OnPreRender(EventArgs e)
{
// add base.OnPreRender(e); at the beginning of the method.
base.OnPreRender(e);// codes to handle with your controls.
...
}
Also, there's a good sample on how to create an ASP.NET AJAX Toolkit Extender Control to Extend an standard control. See,
http://weblogs.asp.net/dwahlin/archive/2007/08/08/creating-an-asp-net-ajax-toolkit-extender-control.aspx

ListSearchExtender Question

My users have a listbox that I am using the listsearchextender to help them, however if a value is not found in the list what ever the last item similer

is left in the list box.

is there a way to say change the color to red if they start typing some thing not found in the list?

Hi,

This isn't a build-in feature. If you really need this, you may have to modify its source code.

Please investigate the _searchForTypedText method in ListSearchBehavior.js file and add necessary codes.

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