AJAX :: Dropdown SelectedIndexChanged Event Is Not Firing

Sep 13, 2010

I have a usercontrol and in that i have a dropdown. i need async postback for dropdown selectedindexchanged event. i set the AutoPostBack=true for dropdown. Eventhough the event is not getting fired.

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Similar Messages:

AJAX :: How To Stop The SelectedIndexChanged Event For Listbox1 In UpdatePanel1 From Firing

Jun 15, 2010


I have 3 update panels on a page, each of them have UpdateMode="Conditional".

UpdatePanel1 contains listbox1 (AutoPostBack set to true) which is populated on pageinit from the DB.

UpdatePanel2 contains listbox2 (AutoPostBack set to true), this panel has AsyncPostBackTrigger set to the SelectedIndexChanged event for listbox1 in UpdatePanel1.

UpdatePanel3 contains textboxes that will hold the details once an item has been selected from listbox1 and listbox2, this panel has an AsyncPostBackTrigger set to the SelectedIndexChanged event for listbox2 in UpdatePanel2.

In the codebehind, the SelectedIndexChanged event for listbox1 populates listbox2 and the SelectedIndexChanged event for listbox2 populates the textboxes in UpdatePanel3.

The problem

When the page loads listbox1 is correctly populated, I select a value from listbox1 and listbox2 is populated, great, no problem so far. When I then select a value from listbox2 the SelectedIndexChanged event for listbox1 is firing, I assume that as this populates listbox2 again it is clearing the selected value for listbox2 as the SelectedIndexChanged event for listbox2 is not firing.

How do I stop the SelectedIndexChanged event for listbox1 in UpdatePanel1 from firing when I select a value from listbox2 in UpdatePanel2 ?

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Update Panel - Textbox TextChanged Event Is Interfering With The DropDown SelectedIndexChanged Event?

Oct 20, 2010

Basics: I have a text box (txtDepositAmount) that people can enter a deposit amount into and a drop down (ddlSelectedTerm) that sets the terms. Through these two values I calculate the APY (lblCurrentApy).

Rules: If only one of the values is selected I still want to do an update on the current APY label and clear it. If either value changes I want to update the current APY and recalculate.

The problem: As soon as I click away from the textbox and onto the drop down to select my term the drop down flashes and closes because the textbox TextChanged event was just fired.

I have to click on the drop down a second time to be able to select anything!

Do I need to change what event I'm looking at or do I need to move some of the controls outside of the UpdatePanel? Can this only happen if some of the business rules change? Should I just give up and go to javascript?


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Web Forms :: How To Call Dropdown SelectedIndexChanged Event In Page Load Event In C#

Oct 15, 2010

in my web form i have a department dropdown box, in its selectedIndexChanged event i have to fill the equipment dropdown box and in equiment dropdown selectedIndexChanged i have to fill out the other textboxs.

the depratment dropdown box get its value from sqldatasource.


what i want is when i run the page, it shows the very first deparment in the list, and according to that it should pop up the values in the other fields, means it should show the values in the equipment dropdownbox and from that one it should pop up the values in the other textbox.

here is my selected indexchanged event for department dropdownbox


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Web Forms :: Unexpected Dropdownlist SelectedIndexchanged Event Firing?

Mar 2, 2011

Getting an unexpected event firing dropdownlist's selectedIndex event. When I try to redirect from another page by a linkButton. I just changing dropdownlist selectedIndex.Its okay.But after that When I attempt to redirect to another page,DropDownList's selectedIndex event firing (before linkButton Onclick event).But I am not changing any thing in dropdownlist.Somehow its event firing.

also any page viewstates is default (not off).But loading webcontrols into masterpage Page_Load like this :


if this dropdownlist selectedIndexchanged event firing. Because of I am loading webcontrols each masterpage's PageLoadEvent.

What do you prefer this may the reason of this unexpected event firing ? if so. Do you have a better technic to load controls Just for one time and not each pageLoad.maaybe a caching technic I am missing or shoult I use substution.

I couldnt find the main reason why a dropdownlist selectedIndexchanged event firing without I changed anything on that dropdownlist.

what reasons may cause this problem ? if you say viewstate its turned on defaultly. any other reason you know why ?

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Data Controls :: DropDownList SelectedIndexChanged Event Not Firing

Jun 6, 2013

I take drop down list control ,from below code i bind data into drop down list from database...

public void load() {
try {
string sCon = gv.constr;
MySqlConnection con = new MySqlConnection(sCon);
String s = "Select * from company";
MySqlCommand cmd = new MySqlCommand(s, con);

[Code] ...

I used to done select index change event onĀ  drop down list bt it's not working... I want select index value of drop down list item into textbox....wat i do?

protected void drpOrg_SelectedIndexChanged(object sender, EventArgs e){
string sCon = gv.constr;
MySqlConnection con = new MySqlConnection(sCon);
String s = "Select companyid from companyuser where orgname='"+drpOrg.SelectedValue.ToString()+"'";

[Code] ....

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Web Forms :: SelectedIndexChanged Event Not Firing For Control Added To Panel

Jan 1, 2011

At run-time I add a dropdownlist but when user selects an item there is no event for:







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Forms Data Controls :: Dropdownlist In A Repeater Firing The SelectedIndexChanged Event?

Oct 5, 2010

I have a dropdownlist in a repeater and it's firing the SelectedIndexChanged event but in teh event handler I can not get the dataitem associated with the row that the DDL is in. Here is the code:

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Web Forms :: When Load The Form / Combobox SelectedIndexChanged Event Is Firing Automatically

Feb 17, 2011

I am using 2 combobox , In form_load event i am loading the combobox using dataset and In selectedIndexChanged event of the combobx1 we have to load combobox2

I am having a problem that when i load the form, combobox selectedIndexChanged event is firing automatically So how can i avoid this.

I understand that if it's a web application then IsPostBack method will be useful, but what to do as it's a windows (desktop) application.

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Forms Data Controls :: Dropdown's Selectedindexchanged Event Not Fire In IE?

Feb 11, 2010

In one webpage,

There is one updatepanel in that one gridview,

there is one dropdown in headerrow of gridview,

dropdown's selectedindexchanged event fire in FireFox but not in IE.

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Forms Data Controls :: DropDownList Inside GridView Inside UpdatePanel SelectedIndexChanged Event Not Firing?

Aug 16, 2010

I have an UpdatePanel with a GridView. This GridView has a template column that is a DropDownList. The problem is that the SelectedIndexChanged event does not fire for the DropDownList. Here is the code:


The codebehind:


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C# - The OnSelectedIndexChanged Event Is Not Firing For Dropdown Box

Jun 8, 2010

The OnSelectedIndexChanged event is not firing for my dropdown box. All forums I have looked at told me to add the AutoPostBack="true", but that didn't change the results.



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AJAX :: Cascading Dropdown SelectedIndexChanged Doesn't Fire

Jun 11, 2010

I just wanted to clarify if selectedIndexChanged works on ajax cascading dropdowns as mine doesn't fire. Its in a user control inside an accordion pane. I've read conflicting things about this. All I want to do is check that the last of the 3 cascading dropdowns has been populated an enable a button if so.... but the event never fires when i make a selection on the last dropdown. If it isn't suppose to fire is there a way to raise an event when the selection is made and unmade (as when you change one of the other dropdowns the value resets and the buttton needs to be disabled.

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Customized CreateUserWizard Control Is Firing Dropdown's OnSelectIndexChanged Event?

May 6, 2010

I have a CreateUserWizard control, for which I customized the first step.

All I did was add 3 DropdownLists to represent Date of Birth fields. So I have Month, Day, and Year dropdowns.

I have ViewState disabled at application level (disabled it in web.config).

I enabled viewstate on Month, enabled AutoPostback = true, and have a method for the event OnSelectedIndexChanged.

Depending on the Month, the values in Day can range from 28-31.

Now when I fill out the form and hit Create User, the Month_OnSelectedIndexChanged event gets fired first for some reason. I found this out by debugging. Because of this, it does not save the Day the user has picked.

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AJAX :: TabPanels And UpdatePanels And SelectedIndexChanged Event Of The DDL?

Jan 29, 2010

I have a DropDownList in a TabPanel.In a separate TabPanel I have a control wrapped in an UpdatePanel which is tied to the SelectedIndexChanged event of the DDL in the first panel.At run-time I get an error from the UpdatePanel indicating the DDL control does not exist.

I moved the UpdatePanel into the same TabPanel with the DDL.The DDL has AutoPostBack set to true and the event for SelectedIndexChanged never fires.I also turned off Validation in case a validator was capturing it.This all worked fine before I "tabified" this page.

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AJAX :: SelectedIndexChanged Event Not Working When Using CascadingDropDown

May 7, 2015

I have two dropdownlist in cascading using a web service, all is cool, but the problem is how use the method onselectedindexchanged in the second dropdownlist, method onselectedindexchanged in second dropdownlist don't work, how could i use method selectedindexchanged in web service?

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AJAX :: DropDownList Inside UpdatePanel Not Updating TextBox In SelectedIndexChanged Event

Oct 26, 2013

I have 1dropdownlist and 1 textbox in my page

I want when I select item from DropDownList in textbox write"Correct" so I wrote below code

protected void DDLclass_SIC(object sender, EventArgs e)
Txtsub1.Text = "Correct";

but it didn't worked when I select Item from DDL in textbox didn't wirte "Correct"

How I can do it?

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Web Forms :: SelectedIndexChanged Is Not Firing?

Jun 7, 2010

I have a problem with dropdown list. I have two dropdown lists on my web page. On page load event i have populated my first dropdown list which is working fine. I want to populate my second dropdownlist based on the selected value of first one , But theSelectedIndexChanged of my first event is not firing even i have set AutoPostBack property to true.

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AJAX :: SelectedIndexChanged - Why Event Fired Within The Onblur - Event When It's Fired Anyway

May 3, 2010


A breakpoint is set on FillForm() and this method is called two times but I can't explain myself why this happens. I have client side javascript code, when the form is being send, the onsubmit method is also called twice... Where do I have to search?! Is it a (known) bug? Think I could get it to work with this Thread: [URL] But why is the event fired within the onblur-event when it's fired anyway??

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C# - Item In RadioButtonList Not Firing SelectedIndexChanged

Aug 10, 2010

I have a table cell with a RadioButtonList. When each item is selected, the SelectedIndexChanged event is supposed to fire so the app can populate a related listbox. The problem is it stopped working. Now if I selected the first entry 'Division', the event never fires. I put a break-point on the event handler and it gets called for the other entries but not for Division. I'd believe it if some other code is interfering, I just don't know where to start looking.

[update] By not working, I mean if you selected Item #2, the update works; then if you select Item #1 it doesn't. If I change where the 'Division' item appears in the list, it still has the problem. Is there something in the page load cycle that could be aborting the event handling chain?

private TableCell foo()
hierarchyLevel = new RadioButtonList();
ListItem DivisionItem = new ListItem();
DivisionItem.Text = "Division";
DivisionItem.Value = "afe_dvsn";
ListItem DistrictItem = new ListItem();
DistrictItem.Text = "District";
DistrictItem.Value = "afe_dist";
ListItem AreaItem = new ListItem();
AreaItem.Text = "Area";
AreaItem.Value = "afe_supt";
ListItem ForemanItem = new ListItem();
ForemanItem.Text = "Foreman";
ForemanItem.Value = "afe_frmn";
ListItem AfeCodeItem = new ListItem();
AfeCodeItem.Text = "AFE Code";
AfeCodeItem.Value = "afe_code";
ListItem PropertyItem = new ListItem();
PropertyItem.Text = "Property";
PropertyItem.Value = "prop_sub";
TableCell cellforHierarchyLevel = new TableCell();
cellforHierarchyLevel.ID = "hierarchyLevel";
hierarchyLevel.EnableViewState = true;
hierarchyLevel.AutoPostBack = true;
hierarchyLevel.SelectedIndexChanged += new EventHandler(hierarchyLevel_SelectedIndexChanged);
return cellforHierarchyLevel;

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AJAX :: While Typing Some Text In Search Lable Of Listsearchextender The SelectedIndexChanged Event Is Fired And The Page Is Posted Back?

Jul 9, 2010

In my current web application I have a listbox containing large number of elements. I have used an ajax listsearchextender to help the users in selecting the elements. I have set the autopostback property of listbox true. The application is working fine as expected in internet explorer. But in firefox while I am typing some text in search lable of listsearchextender the selectedIndexChanged event is fired and the page is posted back. So I am not able to selected the item properly using list search extender control. Can you please suggest me how can I stop the selectedIndexChanged event.

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Web Forms :: Drop Down List SelectedIndexChanged Not Firing

May 29, 2010

I am developing a C# / SQL website application in VS 2008 and using SQL Server 2008. I am a newbie. Right now though I can not get the drop-down box to display the SQL table columns. This application should return all of the rows from the selected table. And then I append one row = IGNORE to the end of the list. But when I run this app the first time, it correctly displays the list of available values from the table and appends IGNORE on the end. However, after postback it only displays IGNORE value for me to select. I thought this might be a Viewstate or Autopostback problem, but I tried changing these values and it did not fix it. Here are excerpts from my code.

The problem is that the "targettable" variable is null after postback. But I don't see what is causing this.


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AJAX :: Event Not Firing In Firefox?

Jun 4, 2010

Unusual one this - IE7 and IE8 both behaving, but Firefox isn't. So, I suspect that I have done something wrong which I am "getting away with" in IE.....I have a DynamicPopulateExtender (DPE) and two ModalPopupExtenders (MPE). A Javascript function shows the first MPE (a "please wait" message) and then retrieves the DPE. When the DPE finishes retrieving, its populated event fires - that hides the first MPE and shows the second one which holds the results retrieved by the DPE.I know that I could have used built in functionality within the DPE to display the "please wait" message. However that would mean displaying the MPE before populating the DPE. I can't do that because I want to size the MPE depending on what comes back from the DPE.So, this is my Javascript:


As I said, it works fine in IE7 and IE8. In Firefox (and Opera and Safari), the "please wait" appears and then nothing else happens.

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AJAX :: Event Not Firing On Tab Container Control

Mar 5, 2011

i'm using ajax tab container control and i have 4 tabs on it. and each tabs contains a datalist. and whenever someone clicks on the datalist he has to redirected on abc.aspx page.so for that i 'm using itemcommand event but facing problem whenever i click on datalist the event is not fired.

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AJAX :: ModularPopUpExtender- Button Event Not Firing?

Jun 12, 2010

<asp:Button ID="btnUpdate" runat="server" Text="Update" CausesValidation="false"

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