DropDownList SelectedIndexChanged Reverting To Some Other Value
Sep 21, 2011
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] ....
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[code]....
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[Code]....
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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
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Line 16: Dim ComDropDownList As DropDownList = CType(FormView1.FindControl("ddlCommune"), DropDownList)
Line 17:
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[Code]....
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[Code]....
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DataSourceID="PrescriptionCodeDataSource"
DataTextField="CodeDescription"
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ID="PrescriptionCodeDataSource"
runat="server"
ConnectionString="<%$ ConnectionStrings:SystemConnectionString %>"
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Type="Boolean"
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ControlID="ddlPrescriptionCodeGroup"
Name="PrescriptionCodeGroupID"
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Type="Int32"
/>
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When I select from the first dropdown I want to populate the second. However, this is not happening. The postback is happening, but the SelectedIndexChanged handler isn't being called (I have a breakpoint which isn't being hit). The user controls are created dynamically and put into a PlaceHolder which itself is within an AJAX Updatepanel, with ChildrenAsTriggers set to true.
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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 {
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[Code] ...
I used to done select index change event on drop down list bt it's not working... I want select index value of drop down list item into textbox....wat i do?
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con.Open();
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[Code] ....
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Apr 28, 2010
I have in my MasterPage a DropDownList that appears in all my Pages. I want it to run a specific code when user select another item in the list, but the event SelectedIndexChanged in the MasterPage doesn't work. How can I do to get this event working?
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Feb 4, 2010
I've got a UserControl that's used inside of an UpdatePanel. The UserControl is a fairly simple form that appears via a ModalPopupExtender (which is also part of the UserControl). There are four DropDownLists, as well as some other UI elements. Three of the four DropDownLists have AutoPostBack="true", with SelectedIndexChanged events that fire on the server and cause some of the other DropDownLists to rebind. Two of the three DDL's that AutoPostBack are working fine. One of them, which I only just added, is showing some strange behavior. Let's say I bind five Items to it: 1, 2, 3, 4, 5. I set the SelectedIndex to 0, which makes 1 the selected item. If I select 5 and then 1 and keep toggling back and forth, everything works fine. The postback occurs and SelectedIndexChanged fires. Every time. If I ever select 2 or 4, the postback occurs but SelectedIndexChanged does not fire. Every time.
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HTML (and by the way, DropProtocolCycleID is the problem control):
<asp:Panel ID="PanelPopupAssign" runat="server" Style="display:none; cursor: move; width:325px; background-color:Transparent;">
<BlueUI:Panel runat="server" ID="PanelPatientProtocol" Width="500px" HeaderText="Assign Protocol">
<table cellspacing="5">
<tr>
<td style="width:150px;"></td>
<td style="width:50px;"></td>
<td style="width:125px;"></td>
</tr>
<tr runat="server" id="TableRowCategory">
<td align="right">Category:</td>
<td colspan="2">
<asp:DropDownList runat="server" ID="DropProtocolCategories" CausesValidation="false" autopostback="true"/>
</td>
</tr>
<tr>
<td align="right">Protocol:</td>
<td colspan="2">..............................
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Dec 9, 2010
I create a dropDownList in code-behind, in selectIndexChange of another dropDownList, and add this new dropDownList to page using a placerHolder, everthing its ok, but new dropdownlist selectIndexChange event dont fire!
code of dropDownList creation
dropDown = new DropDownList();
dropDown.AutoPostBack = true;
dropDown.ID = idSubistema;
dropDown.Width = 400;
dropDown.CssClass = "controltext";
dropDown.DataValueField = "IDNivel";
dropDown.DataTextField = "NIVEL";
dropDown.EnableViewState = true;
dropDown.DataSource =
DBLibray.DefinitionIndicadores.spSelect_FillCombosWithNivelByIdParent(
ref dataConnector,
Convert.ToInt32(idSubistema));
dropDown.DataBind();
dropDown.SelectedIndexChanged += new EventHandler(indexChange);
//dropDown.PreRender += new EventHandler(dropDown_PreRender);
placeHolderForCombos.Controls.Add(new LiteralControl("<div>"));
placeHolderForCombos.Controls.Add(lb);
placeHolderForCombos.Controls.Add(new LiteralControl("<br>"));
placeHolderForCombos.Controls.Add(dropDown);
placeHolderForCombos.Controls.Add(new LiteralControl("</div>"));
placeHolderForCombos.Controls.Add(new LiteralControl("<br>"));
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Jul 10, 2010
on SelectedIndexChanged event handling of DropDownList in ItemTemplate of ListView. I put OnSelectedIndexChanged="DropDownList1_SelectedIndexChanged" in mark up, with code behind, but only to get Compiler Error Message: BC30456: 'DropDownList1_SelectedIndexChanged' is not a member of 'ASP.webform1_aspx'. How do I make it a member? When I do not put OnSelectedIndexChanged="DropDownList1_SelectedIndexChanged" in mark up, BC30456 does not pop up, but nothing happens when dropdownlist selected item is changed.
[Code]....
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Jan 12, 2011
I am adjusting my DropDownList on my MASTERPAGE to point to resourcefiles - like this:
<asp:DropDownList runat="server" ID="Language1" AutoPostBack="true" OnSelectedIndexChanged="Language1_SelectedIndexChanged">
<asp:ListItem value="0" Text="<%$ Resources:SiteMapLocalizations, DropDownSelect1%>"></asp:ListItem>
<asp:ListItem Value="0" Text="<%$ Resources:SiteMapLocalizations, DropDownSelect2%>"></asp:ListItem>
<asp:ListItem Value="0" Text="<%$ Resources:SiteMapLocalizations, DropDownSelect3%>"></asp:ListItem>
</asp:DropDownList>
Problem now is that my SelectedIndexChanged has broken its funktionality in MasterPage.master.vb:
Protected Sub Language1_SelectedIndexChanged(ByVal sender As Object, ByVal e As EventArgs)
Dim cookie As New HttpCookie("SelLang")
cookie.Value = Language1.SelectedValue
Response.SetCookie(cookie)
Response.Redirect(Request.UrlReferrer.AbsoluteUri)
this is for the redirecting to the referrer page
End Sub
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Dec 3, 2010
The sites I mantain are using way too much ViewState and I'd like to reduce that so the size of the page is reduced. I've done a lot to remedy this but I have an issue relating to DropDown lists that use AutoPostbacks.I have a dropdown list with a lot of list items and a good part of the ViewState usage is to hold the list item data. If I disable ViewState and set the AutoPostBack property to true, the page will post back and in the page load I am trying to repopulate the dropdown list with cached data. However, it seems that the SelectedIndexChanged event doesn't fire when EnableViewState="false".Is it possible to make this work without enabling ViewState for the drodown list?
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Jul 15, 2010
How to render selected data from dropdownlist to controller and handling selectedIndexChanged eventin ASP.Net MVC.
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