I have an ASP.NET DropDownList with AutoPostBack=true and EnableViewState=false. I have a button on the page that does nothing. If I change the selection in the ddl, it posts back , which is expected. If I click the button, the page posts back and the ddl's SelectedIndexChanged fires. Why does it get fired?
View 3 Replies<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
Consider the following:The SomeEvent fires as expected when any of the dropdown's selection is changed. However if say DropdownList2 has a selection made then I make a selection with either DropDownList1 or DropdownList3, then SomeEvent fires again. What is causing this behavior and how do I get just a single raising of that event?I suspect that when the viewstate for the dynamcially created dropdownlists is restored and the selection restored, then the event is fired because technically the selected index did change when the control was recreated. The reason I suspect this is that the event fires the for each dropdownlist.
View 3 RepliesI ask for a date, on OnTextChanged event i bind data with a SqlDataSource to a dropdownlist and also bind data to a repeater passing the dropdownlist SelectedIndex (i use SqlDataSource too and ControlParameter to link the dropdownlist and the repeater) On my repeater during the ItemDataBound event i create dynamic dropdownlist controls, my code is :
[Code]....
[Code]....
On the Page_load event of my page i bind the data & recreate the control :
[Code]....
Everything works fine, datas are bound and SelectedIndexes are restore on every postback.
The probem occurs when user change different dropdownlists, if he choose to change the 1st dropdownlist the event is fire (normal), after if he modifies another dropdownlist the event is fire twice, if he modifies a 3rd time the event is fire 3 time etc...
I have a listveiw populated from a List<> in the code behind using the following code:
SubId = Convert.ToInt32(Request.QueryString.Get("SubId"));
using (JodyCoryDataContext myDataContext = new JodyCoryDataContext())
{
var SelectedRings = from jewlery in myDataContext.Jewleries
[Code]....
The page displays the images from the list<> and button ok but nothing happens when i click it other than postback. Furthermore even when i set up a test button wich changes the ListView.selectedindex the ListView.SelectedIndexChanged event never fires even though i can read the selected index and see that it has changed.
I'm guessing that it's something to do with using a list<> from the code behind to populate the listview but i must confess to being completely clueless.
I have page on which I've a login control in which I've a subnit button. The problem is this that when I refresh the that page the submit button or any button that was clicked last before page refresh gets its click event automatically fired.
View 1 RepliesI have a dropdownlisbox , i am changing the selectedIndex by PageMethod(i.e it will change its value and text on checkbox status). At that time it don't fire the selectedIndexchange method but when i click the button it fires(i.e on postback).
<td width="65%" align="left">
<asp:UpdatePanel ID="upPCountry" runat="server" UpdateMode="Conditional">
<ContentTemplate>
<asp:DropDownList ID="ddlCountry" runat="server" Width="125px"
AutoPostBack="true" onselectedindexchanged="ddlCountry_SelectedIndexChanged" >
<asp:ListItem Value="1">USA</asp:ListItem>
<asp:ListItem Value="2">Canada</asp:ListItem>
[Code] .....
how to get value of DropDownlist after Button Clicked ,when using static function?
[Code]....
This is how i have it setup:DAL: a dbml file for the contextBLL: All my BL rulesTypes: I made type for every object that i return to my presentation layer.Now that i made types and use this structure i find it hard to understand how to manipulate data. Normally i could just bind my datacontext to a grid and just activate all the datagrid's possibilities without having to worry about anything. for example when i want to enable sorting, i have to write my own logic to return teh right rows to the grid etc.
I have a multiview with two datagrids. The first datagrid is an overview grid and has an option to select an entry. When i select the entry i switch to my second view and I want to show the details for the selected object there.However... I bound a List to the first grid and now I don't know how to find out what entry is selected. I have an event handler for the SelectedIndexChanged.
I have an ASP.NET page that contains a gridview.
I have to create columns dynamically based on a datatable, some field type info and some header texts.
I do that by creating templates.
It created the grid fine and all looks good, however when i click a checkbox and the checkedchanged event fires then something odd happens
The first time i click its fine and i get the expected values in the event
But the second time then the event gets fired with the values from the first time and then again with the values from the checkbox that i actually clicked.. The third time the event gets fired 3 times, first 2 times with the old values and the third with the correct value.
Here is the code:
using System;
using System.Collections;
using System.Configuration;
using System.Data;
using System.Linq;
using System.Text.RegularExpressions;
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;........
I have a simple vb.net page. The first control on the page is a dropdownlist that the user selects from. The second is a text box with a search button. When search is clicked, a third control (another dropdownbox) is populated. BUT, whenever that search button is clicked, the first dropdownbox seems to refresh, and I loose the selection that the user made.
View 1 RepliesI have a dropdownlist (dr1) that is supposed to trigger the update of dr2 without affecting dr3. The problem is that dr1 triggers the update, but does not go into dr1_SelectedIndexChanged. I know that because the label does not change and that the pause does not happen
Here is my HTML code:
<form runat="server">
<asp:ScriptManager ID="sm" runat="server" />
<asp:UpdateProgress ID="UpdateProgress1" runat="server" DisplayAfter="5">
<ProgressTemplate>
[Code]....
There are a couple of things going on in this post:
1. The DropDownList (DDL) reverts back to index = 1 on postback (this has been solved, post #10)
2. Use of General Lists to populate the DropDownList (Post# TBD)
I have a series of DropDownLists (DDLs) one depending on the other for its selection value. The first one specifies the table name. On the SelectedIndexChanged event of the table name DDL the second DDL is populated with a list of field names contained in that table. And the third DDL with unique values contained in the selected field (In case you are wondering I am building a custom query tool).
The problem is that the Field names DDL, after selecting a new field, reverts to the second field listed in the table, something to do with the postback I would presume. The interesting thing is that it does not happen for the Table name DDL, though I am doing something a trifle bit different there.
I'll include the code for the three DDLs and the two SelectedIndexChanged events.
ASPX:
<td> <asp:DropDownList ID="DDL_TableNames" runat="server" AutoPostBack="True">
</asp:DropDownList>
</td> <td>
<asp:DropDownList ID="DDL_FieldNames" runat="server" AutoPostBack="True">
</asp:DropDownList>
[Code] ....
I have a DropDown which is bounded to an ObjectDataSource. On its data bound event, I am adding "--select--" value on the 0 index. I have a LinkButton on the page and on its client click, i am selecting different item on drop down (using JavaScript). Suppose there are 3 items like --select--, option1, option2 and option3 and now on link button's client click i selected option3, now if I select the default value "--select--", it does not fire the SelectedIndexChanged event. If I select any other value then it fires. Why does it not work for the default value?
[code]....
I have a cascading dropdown list on my page. The first dropdown contains a list of events. The second dropdown contains a list of attendees. When an event is selected, an AJAX call is made to get the list of attendees for that event, and populate the second dropdown.
My problem is that for the attendees dropdown, I want the user to be redirected to a URL on the SelectedIndexChanged event, with the selected value in the query string. But on the SelectedIndexChanged event, all the items in the second dropdown are reset. Here's my code:
<script type="text/javascript" language="javascript">
$(document).ready(function()
{
$('#<%= ddlEvents.ClientID %>').change(function()
{
$.ajax({
[Code]....
When the SelectedIndexChanged event is hit, ddlAttendees is empty.
Does anyone know how I can keep the items in ddlAttendees?
I have a radiobutton list that changes the contents of a dropdownlist when the selected radiobuttonlist index is changed using the SelectedIndexChanged event. Both controls are within the same updatepanel and both have autopostback set to true.
For some reason when I change the dropdownlist and cause a postback, the radiobuttonlist change event fires and repopulates the dropdownlist which effectively cancels the selection made in the dropdown.
I know something simple must be causing this behaviour but I cannot think what and my debugging efforts are not shedding any light thus far. I have tried putting a breakpoint on every procedure in my form and the first event that fires is the radiobuttonlist SelectedIndexChanged event so nothing in my server side code seems to be doing this which suggests it is something in the markup but I can't think what.
I have some code which fires when user selects an item in dropdownlist. Now i want the same code to fire when i set selectedindex programmatically.
I have tried setting
ddlSystemLevelDCP.SelectedIndex=2;
and this as well
ddlSystemLevelDCP.SelectedValue="2";
None of them fires this event.However when user changes the selection,this event fires.Please tell me what am i missing.
I have one dropdownlist control which populates values to other controls. Means upon selecting item in dropdownlist, related data is populated in other controls. I have also assigned dropdownlist's autopostback to TRUE. Everything is working good as far as dropdown has more than one item.
Whenever there is only one item, selectedindexchanged event is not fired (obviously.....) and eventually the data is not populated to other controls.
How could I get rid of this scenario? I mean which event should I use to avoid this?
At this time, I have just added the first item as something like "---Select Item---" , so when end-user has to select different item and thus the selecteditemindexchanged is fired. no biggie... but just wondering if proper solution is available....
I have a dropdownlist inside a formview and I'm trying to do something on the selectedindexchanged event. but I'm getting the following error:
It looks like it can't find the dropdownlist because it is inside the formview. How can I find the event?- if there is such a thing.
Server Error in '/WebSite4' Application. Compilation Error
Description:
An error occurred during the compilation of a resource required to service this request.
review the following specific error details and modify your source code appropriately. Compiler Error Message: BC30506: Handles clause requires a WithEvents variable defined in the containing type or one of its base types.
Source Error:
[Code]....
Line 13:End If
Line 14:End Sub
Line 15:Protected Sub ddlDept_SelectedIndexChanged(ByVal sender As Object, ByVal e As System.EventArgs) Handles ddlDept.SelectedIndexChanged
Line 16: Dim ComDropDownList As DropDownList = CType(FormView1.FindControl("ddlCommune"), DropDownList)
Line 17:
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.
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">
[code]...
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].......
dropdownlist selectedvalue not firing.
It shows the inital value after i selected the value from dropdown box and submitted
HTML Code:
<asp:DropDownList ID="DropDownList1" runat="server" OnSelectedIndexChanged="DropDownList1_SelectedIndexChanged">
</asp:DropDownList>
.CS File:
Protected void page_load()
{
if (!IsPostBack)
{
Label_Testing.Text = DropDownList1.SelectedValue;
Label_Testing1.Text = DropDownList1.SelectedIndex.ToString();......
How would I get the previous item on DropDownList before OnSelectedIndexChanged fires the event?
I had a DropDownList that has names as its items ("John", "Mark"). By default the SelectedIndex is "John". Upon changing its index and selecting "Mark" the event OnSelectedIndexChanged will be triggered. When I use ddlName.SelectedIndex it will return only the index for "Mark" which I want to get is the index of "John".
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 :
[Code]....
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 ?