DropDownList AutoPostback Fires When Asynchronous Postback Occurrs?

Aug 26, 2010

Well I have a strange problem.I have a page with 2 DropDownLists on it and a custom web-user-control. The custom web user control has an UpdatePanel within it, and an Ajax Timer control within the UpdatePanel to periodically update a listing of stuff.When I "drop-down" one of the DropDownLists and hover over (not click on) an option while the Timer control within the UpdatePanel asynchronously posts back to the server, the DropDownList "autopostbacks" to the server!

I'm trying to figure out why an asynchronous postback would cause the DropDownList to act as if I selected/clicked on an option so that I can find a way around this issue.Now it's really simple to reproduce this problem. Create a Web User control called "TimerUpdatedListing"...this is the ASPX code markup for the web user control:

<%@ Control Language="vb" AutoEventWireup="false" CodeBehind="TimerUpdatedListing.ascx.vb" Inherits="MyNamespace.TimerUpdatedListing" %>
<div style="width: 150px; height: 150px; overflow: auto; border: solid 1px navy;">
<asp:UpdatePanel ID="anUpdatePanel" runat="server">


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Validation Message Still Show Up When An Autopostback Dropdownlist Fires?

Dec 8, 2010

I have a required field validator to validate a dropdownlist. this dropdownlist is an autopostback one, and it's causevalidation property is set to be false.the issue is, when I select the default item, the validation message shows, but the still do the postback. And after the postback, the message disappers.here is the snippet of codes:

<asp:RequiredFieldValidator ID="ContactMethodRequired" runat="server" ControlToValidate="ContactPreferences"
Display="Dynamic" ErrorMessage="Please choose your contact method"
EnableClientScript="true" InitialValue=""></asp:RequiredFieldValidator> [code].......

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DropDownList Always Does Full-page Postback, The First Time It Fires?

Mar 18, 2010

I have an ASP.NET page using the AJAX library. There is a dropdownlist inside an UpdatePanel, which on index changing is supposed to update a different UpdatePanel to modify a grid control.But after the page first comes up, and you adjust the ddl, the entire page postbacks, followed by a (correct) partial postback. After this one time, every other usage of the ddl performs correctly, trigger partial postbacks.

Both the panel and the ddl are being added from code. The UP is Conditional updates and ChildrenAsTriggers = true. The dropdownlist is AutoPostBack true and has an event set up on SelectedIndexChanged.So what is going on? I've tried adjusting every setting I can think of and still the page completely refreshes once, then works fine after that.

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Forms Data Controls :: DropDownList -- SelectedIndexChanged Fires Every Postback Whether Changed Or Not?

May 12, 2010

<asp:DropDownList ID="cboItemsPerPage" runat="server" CssClass="standardComboBox" AutoPostBack="true" EnableViewState="true" OnSelectedIndexChanged="cboItemsPerPage_SelectedIndexChanged">
<asp:ListItem Value="1" Text="1" />

[URL]Initially if I make a selection it will automatically post back and firecboItemsPerPage_SelectedIndexChanged. If I then post back by clicking one of the other buttons on the page, cboItemsPerPage_SelectedIndexChanged will continue to fire, despite the fact that the value has not been changed.I want it to be postback only when selected index is changed, not in every postback

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Mar 2, 2010

I've got an odd situation with a text box and an autocomplete setup on my page. I'm using a JQuery based autocomplete on a text box that has AutoPostBack="True". This works perfect if I use the keyboard to select an autocomplete item, which then fires Jquery to fill in the text box, and then when I tab out of the box the AutoPostBack fires. If, however, I click on an autocomplete item, my text box loses focus first and the AutoPostBack fires before the Jquery has a chance to change the text in my text box. Is there a way to delay either the PostBack or the Jquery so that they don't fight each other? I'm thinking it may have to be the PostBack that gets changed, since the JQuery would lose it's state on the PostBack

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AJAX :: Update Panel With DropDownList With AutoPostBack="True" Dont Want To Postback It?

May 13, 2010

IAm using ASP.NET Ajax.
Iam having a Update Panel with DropDownList with AutoPostBack="True"
I dont want to postback it, but it going postback, i dont want AutoPostBack="false"

Here my code:
<form id="form1" runat="server">
<asp:ScriptManager ID="ScriptManager1" runat="server" EnablePartialRendering ="true" >
<br />
<br />
<asp:DropDownList ID="DropDownList1" runat="server" AutoPostBack ="true" OnSelectedIndexChanged ="DropDownList1_SelectedIndexChanged" >
<asp:ListItem Value="0">----Select----</asp:ListItem>
<asp:ListItem Value="101">General Admin</asp:ListItem>
<asp:ListItem Value="102">Admin Assistant</asp:ListItem>
<asp:ListItem Value="103">Software</asp:ListItem>
<asp:ListItem Value="104">Recruiting</asp:ListItem>
<asp:UpdatePanel ID="UpdatePanel1" runat="server" UpdateMode ="Conditional" >
<ContentTemplate >
ID="DropDownList2" runat="server">
<asp:ListItem Value="0">----Select----</asp:ListItem>
<Triggers >
<asp:AsyncPostBackTrigger ControlID ="DropDownList1" EventName ="SelectedIndexChanged" />

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TextBox And Calendar Extender When Using AutoPostBack=true Never Fires?

Jan 30, 2010

I have the following sample code



When I place a value in TextBox1 and then click inside TextBox3 (which is there to have a place to go to get out of TextBox1 and TextBox2) the value from TextBox1 remains and is displayed in the MessageBox.Show correctly.

When I pick a value from the drop down calendar extender in TextBox2 for a brief micro-second the value from the calendar displays in TextBox2 and then the MessageBox.Show displays and the value in TextBox2 returns back to the orginally set value. The MessageBox.Show shows the orginally set value.

For TextBox2 if I set AutoPostBack=false then the TextBox2 works correctly and keeps the date picked from the calendar extender but the ontextchanged="TextBox2_TextChanged" never fires.

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Jun 8, 2010

I have 2 textboxes and a submit button inside a .net composite server control. I tried to only postback when submit button is clicked. I set autopostback = false for both textboxes. But either one still trigger submit button's onclick event by hitting "Enter" inside textbox. How can I stop postback by enter key?

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Oct 15, 2010

When an asynchronous postback happened inside update panel, another postback happens also for MasterPage not only update panel embedded page .

I want to prevent this MasterPage postback .

is this possible ? think like i have a MasterPage

and another page which is test.aspx which is content page of MasterPage

i have update panel at test.aspx

when asynchronous postback happens at this test.aspx update panel it also loads MasterPage Page_Load

i want to prevent this (it should not also load MasterPage Page_Load)

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AJAX :: How To Prevent Master Page Postback When Update Panel Asynchronous Postback Happened

Oct 15, 2010

When an asynchronous postback happened inside update panel, another postback happens also for MasterPagenot only update panel embedded page .I want to prevent this MasterPage postback . is this possible ?think like i have a MasterPage and another page which is test.aspx which is content page of MasterPagei have update panel at test.aspxwhen asynchronous postback happens at this test.aspx update panel it also loads
MasterPage Page_Loadi want to prevent this (it should not also load MasterPage Page_Load)

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Aug 27, 2010

can you define autopostback and postback and it's differences and which web server control support autopostback and postback and also the difference between postback and callback?

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Mar 16, 2010

Is there any way can let me set a textbox's value before the asynchronous postback. but I don't want to add a handler for a control which caused that asynchronous postback, because there are too much control can cause that. I want to know if there is a client event would be caused before the postback.

I tried the event initializeRequest of PageRequestManager to do this, but it did not work, it seems like the request has been generated when this event was executed, the value i set in this event for textbox did not be sent to server.

here is a page I used to test

<%@ Page Language="C#" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> runat="server">


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Oct 10, 2010

i am trying to increase my web based game movement system speed as much as possible.

i am using ajax asynchronous postbacks for moving on the map. (if you wanna check address [URL] )

so i am looking for all kind of tips to increase ajax asynchronous postback speed.

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Jan 25, 2011

I have a code like this

protected void DropDownList1_SelectedIndexChanged(object sender, EventArgs e)
string strConnectionString = ConfigurationManager.ConnectionStrings["SqlServerCstr"].ConnectionString;
SqlConnection myConnection = new SqlConnection(strConnectionString);
string musisim = DropDownList1.SelectedItem.Value;
SqlCommand cmd = new SqlCommand("select B.HESAP_NO FROM YAZ..MARDATA.S_TEKLIF B WHERE B.MUS_K_ISIM = DropDownList1.SelectedItem.Value", myConnection);
Label1.Text = cmd.ExecuteReader().ToString();

i have a customer name as "MUS_K_ISIM" and his number as "HESAP_NO" All i want is, (autopostback is true) automaticly getting label "HESAP_NO" with who has this number "MUS_K_ISIM" in Dropdownlist. How can i do that? Error: Description: An unhandled exception occurred during the execution of the current web request. review the stack trace for more information about the error and where it originated in the code.

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Sep 2, 2010

Have a dropdown list with autopostback set to 'yes' have another dropdown list box that will be populated based on the selection of the first dropdown. It works fine until I put a submit botton on the form. When I do it appears to not do the auto postback until the submit button is pushed. Can you have a submit button on a form that has a dropdown with autopostback active.

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Mar 22, 2010

I understand that asp:link button is a control with JS that forces a postback. I have code that runs on OnClick in codebehind of this linkbutton. I placed a counter (with the aid of viewstate) within this code to count the number of times the event fires. The first time it fires the code runs, but as the process is a little long, when the second postback fires it stops the first running in its tracks, so the execution is incomplete. I have googled this issue, and found that some say an img tag with out a complete src address forces a postback, I examined my source and I have no bad src's. The link button is on a complicated ascx page with many controls etc, so I cant post it here. Is there a way to CANCEL the link button immediately OnClick so it only runs once?

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Oct 20, 2009

my dropdownlist fire the SelectedIndexChanged event when every postback ocurred. Why?? I don't understand this. I have 3 more dropdownlist and work fine. The property enableviewstate is set true.

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Oct 16, 2010

i am using asp.net 4.0 iis 7.5 microsoft visual studio 2010

what i want is keep whole page (browser) scroll position (not a div or panel) when asynchronous postback happened (update panel) how can i do this actually i had a function which can keep div scroll bar position after postback like this

<script type="text/javascript">
var xPos, yPos;
var prm = Sys.WebForms.PageRequestManager.getInstance();
function BeginRequestHandler(sender, args) {
xPos = document.getElementById('Main').scrollLeft;
yPos = document.getElementById('Main').scrollTop;
function EndRequestHandler(sender, args) {
document.getElementById('Main').scrollLeft = xPos;
document.getElementById('Main').scrollTop = yPos;

bu i could not find browser scroll bar id to get its values to get with document.getElementById

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Nov 2, 2009

I am working with a GridView that is inside of an UpdatePanel. The sorting and paging asynchronous postbacks work properly. Each row has a delete link that causes an asynchronous postback. The record representing that row is deleted, and the GridViewRow has its 'Visible' property set to false.

When the row being deleted is the only row on the current page, I would like to have the GridView return to the previous page, but I am having problems.

On my masterpage, I have a ScriptManager:


And the UserDeleteControl only has one LinkButton:


With this method, the deleted row is hidden, but if it is the last row on a page, The GridView sits on the empty page. Doing a full refresh of the page will remove the empty page from the pager and return to a populated page, but I would like to avoid a full reload.

Setting applicationUsersGrid.PageIndex does not work
Calling applicationUsersGrid.DataBind does not work
I even tried ClientScript.RegisterStartupScript to call the previous page postback on the pager link, but no luck

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Dec 6, 2009

what is the diffrences between Asynchronous postbacks and normal postback of page

and is Asynchronous postbacks go through the same life cycles events as regular pages ?

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Dec 9, 2009

I have a Update panel and script manager in Master page.

In child pages i have fileupload controls .

then how can i set Triggers and Asynchronous postback controll Id for child pages fileupload controls

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Jan 8, 2010

I have textbox in which pincode has to be entered and it checks with database and gets city and state from database and fills data in other 2 textbox.I have kept asynchronous postback trigger on textbox textchanged event. After reterving data from database i set focus on other textbox of STDCode.But the problem with ie7,ie8 browser is that the focus comes on control but i can't write anything in stdcode textbox untill i move to another textbox. When i come back from another textbox i can write in stdcode textbox.Problem gets occured only in IE7,Ie8 browsers only.Here is design file of that page.

<asp:UpdatePanel ID="UpdatePanel1" runat="server" UpdateMode="Conditional">
<table cellpadding="4" cellspacing="0" width="100%">


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May 18, 2010

I am building a website in which all of the site layout is in Master page and the content of the site is in the inherited pages. I have various links for navigation in which i simple use Response.Redirect to transfer to different pages. Now the problem is that I want to put the content place holder inside Ajax Update panel so that the postbacks are Asynchronous and I want to show the postback by an animated image inside Update Panel progress control. The problem is that I am unable to achieve this result and the entire page is posted back and rendered again. I have placed the content place holder inside the Ajax control toolkit's Update panel but it does not work. Is there any way that I can change the content of the content place holder to a new page with asynchronous postback.


I have same problem, can anyone write a code project exemple

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Jun 4, 2008

I have a DetailsView that contains a DropDownList, bound to an objectdatasource, and I need to show/hide other fields in the view based on the DropDownLists's selection. So the ddl is set to autopostback and in the detailsView Load handler I show/hide the fields as needed, which works. But each postback clears any text field data input or selected.

On the first postback, the DropDown loses its selected value and goes back to default. On subsequent postbacks, it retains its choice, but is the only field to do so.

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Jul 21, 2010

I want to show a confirm dialog when the user selects an item in a DropDownList. If the user presses "Cancel", I want to stop the postback. Here is the function I add to the onchange event:

function imitateConfirmUnload(event) {
if (window.onbeforeunload = null)
return true;

return confirm("Are you sure you want to navigate away from this page?

You have unsaved changes

Press OK to continue or Cancel to stay on the current page.");

And this is the relevant bit of code in my startup script to add the handler to the event:


The problem is that the postback occurs even if the user selects "Cancel". If I move the handler on to the click event, it works. But it feels clunky to me.


Correction: it doesn't work onclick, because the dialog prevents selection, so when the user selects OK, no change has taken place, and no postback when you want it!

Edit 2

The DropDownList is inside an UpdatePanel so that may affect behavior.

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Mar 12, 2010

why asp.net does not render a dropdownlist with the autopostback property set to true when using the RenderControl method.


Dim sw As New IO.StringWriter
Dim tw As New HtmlTextWriter(sw)
Dim table As New Table


my output renders the dropdown list without the onchange="javascript:setTimeout('__doPostBack(ddl1','')', 0)" that is generated by asp.net when using the dropdownlist normally.

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Jan 7, 2011

I am currently developing a project management application using ASP.NET (VB). I am nearly done with it. But whenever users select an item from drop-down list control, a post back is triggered and screen is returned to the bagining. This is very irritating at times.

So, I want to know how can I make partial postbacks so that page is not refreshed again and appropriate binding of list control with my oracle database is also made.

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Aug 20, 2010

first i'll describe my problem:

I have payment form with a clients dropdownlist that is populated from a database on form load with:

value field = clientIdtext field = nameId
<asp:DropDownList ID="selClients" runat="server">

When user makes a payment, it's necessary to chose a client from selClients, and so i get the clientsId value and build my insert SQL query.

Until here, no problems.

The problem with my UI has started since i had a lot of clients been registered: My dropdownlist became huge and it's taking too much time to load it's contents on page load. Also the dropdownlist area is taking a large area from page screen.

So i tryied a solution with jquery autocomplete plug in. I put a textbox with autocomplete for client name and another hiddenfield to receive the clientId when user select a item.

That solves both problems:

No more large amout of data loaded on page loadThe dropdownlist doesn't take a large area from page screen
But it gave me another problem!

With a textbox, there is a possibility for wrong input client name. So if i don't have a valid clientId in hiddenfield, it will generate a database INSERT exception because it doesn't respect the client table constraint:

payment table REFERS client table

I'm trying to find kind of dropdownlist where the user can type text with autocomplete. Like this, the user will be able to select only data within the possibilities of the dropdownlist and i always will have a valid clientId.

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Dec 26, 2008

How can i change selectedIndex on a dropDownList when autoPostBack property is set false.

and to do so using vb.net..

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Sep 4, 2010

I really have no idea on this problem on the cascading dropdownlist. I have a cascading dropdownlist that bind with calling the web services.

I wan to do a autopostback to get the value of the Album GUId so that i can query out all the photo list of that album. it is working well if my page without the AlbumGUId query string.

my problem is:

when i redirect from other page and passing the Album GUId querystring to this page, it will display all my photo for this album guid. but when i change the album to Select which should be able to display all the Photos, it cannot display out. It only will work is when i choose another album and then go back to Select then it only can work..


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