Web Forms :: Drop Down List OnSelectedIndexChanged Event Not Firing?
Apr 27, 2010This is realy simple, basic functionality, but for some reason it's not working.
[Code]....
When I debug I notice that the event never is fired.
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Jun 8, 2010The 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.
HTML:
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Web Forms :: Drop Down List SelectedIndexChanged Not Firing
May 29, 2010I 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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Drop Down Firing Wrong Event?
Jan 4, 2011I'm using VS 2010, .net 4, vb.net. I have an asp.net site and on a page have 2 drop down lists.
<asp:DropDownList ID="ddlClassIndex" runat="server" AutoPostBack="true" />
<asp:DropDownList ID="ddlClassQBankList" runat="server" AutoPostBack="true" />
When the page first loads i can click on either of these, select an item and the event fires correctly. When i select either of the drop down boxes as a second operation, the first drop down, ddlClassIndex.SelectedIndexChanged fires. What have i done wrong that this would be happening. I do a page.ispostback=false check when the page loads and we are also using master pages.
Private Sub LoadClass()
Dim Os As List(Of Dempsey.OldeTestClassIndex) = Nothing
Dim Oc As New Dempsey.OldeTestClassIndex_Controller
Os = Oc._GetClassIndexData(0)
Dim X = From w In Os
Where w.Active = 3
Select w
Os = X.ToList
With Me.ddlClassIndex
.DataSource = Os.OrderBy(Function(o) o.ClassTitle)
.DataTextField = "ClassTitle"
.DataValueField = "tblClassIndexID"
.DataBind()
.Items.Insert(0, New ListItem("Choose Class Title", "0"))
.SelectedIndex = 0
End With
End Sub
Protected Sub ddlClassIndex_SelectedIndexChanged(ByVal sender As Object, ByVal e As System.EventArgs) Handles ddlClassIndex.SelectedIndexChanged
If Me.ddlClassIndex.SelectedIndex > 0 Then
If ClassHasCategories(Me.ddlClassIndex) = True Then
Response.Redirect("AddEditQBank.aspx?ClassIndexID=" & Me.ddlClassIndex.SelectedItem.Value)
Else
Me.lblStatus.Text = "No Categories"
Me.lblStatus.Visible = True
End If
End If
End Sub
Private Sub LoadClassQBankList()
Dim ary As New ArrayList
ary.Add(1)
ary.Add(2)
ary.Add(3)
Dim Os As List(Of Dempsey.OldeTestClassIndex) = Nothing
Dim Oc As New Dempsey.OldeTestClassIndex_Controller
Os = Oc._GetClassIndexData(0)
Dim X = From w In Os Join l In ary On w.Active Equals l
Where w.KT = 1 And w.RandomTest = 1
Select w
Os = X.ToList
With Me.ddlClassQBankList
.DataSource = Os.OrderBy(Function(o) o.ClassTitle)
.DataTextField = "ClassTitle"
.DataValueField = "tblClassIndexID"
.DataBind()
.Items.Insert(0, New ListItem("Choose Class Title", "0"))
.SelectedIndex = 0
End With
End Sub
Protected Sub ddlClassQBankList_SelectedIndexChanged(ByVal sender As Object, ByVal e As System.EventArgs) Handles ddlClassQBankList.SelectedIndexChanged
If Me.ddlClassQBankList.SelectedIndex > 0 Then
Response.Redirect("ClassQBankList.aspx" & "?ClassIndexID=" & Me.ddlClassQBankList.SelectedValue)
End If
End Sub
~~~~~~~~~~
More info
I am checking for page postback. When i select from the drop down, it redirects to a different page. When i click the back button and selected another value in the other drop down, both SelectedIndexChanged fire. So i do i need to do something with viewstate? before i redired to the other page?
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Sep 15, 2010I have an UpdatePanel with a dropdownlist (countries) and a multi-select listbox (locations). If the user selects a country, the locations for the country get populated. By default, all locations must be selected.
Works absolutely fine, except that if you choose a country, then change the country back to the original value ("All Countries") - the OnSelectedIndexChanged doesn't fire. Page PostBack occurs, tho.
AutoPostback is true, everything else works fine, just can't get the darned event to fire on when the original value is Selected. The result is that the drop-down list gets populated with the default list of locations (for All Countries), but they aren't selected...only the subset from the previously selected country are selected?
Web Forms :: SelectedIndexChanged Event Of Drop Down List Not Working?
May 18, 2010i n using java script function to showalert msg .function is as follows
function ShowAlertForScaleResolution()
{
var ddlScale= document.getElementById('<#=ddlScale.ClientId #>');
var ddlResolution= document.getElementById('<#=ddlResolution.ClientId #>');
if(ddlScale.value=="0" || ddlResolution.value=="0")
{
alert("Please select valid Scale and Resolution");
}
return false;
}
my dropdown source code is--
<asp:DropDownList ID="ddlBlockName" onchange="return ShowAlertForScaleResolution();"
runat="server" Width="150px" AutoPostBack="True" OnSelectedIndexChanged="ddlBlockName_SelectedIndexChanged">
</asp:DropDownList>
when i m selecting the BlockName withought selecting any item from ddlScale and ddlresolution then i m showing alert msg.
My Problem is that when i m selecting the details of scale and resolution dropdown then its not showing any errormsg. But its not firing the selected index chaged event of Drop down .
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[Code]....
I have got two questions:
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[Code]....
In my code, I create a drop down list and add it to panel p1
[Code]....
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jobStandardActList.Items.Insert(0,
jobStandardActList.SelectedIndex = 0;
jobStandardActList.SelectedValue =
"----Select an Item----");"";
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<asp:DropDownList ID="fiscal" runat="server" AutoPostBack="True"
DataSourceID="SqlDataSource3" DataTextField="fiscalno"
DataValueField="fiscalno" style="margin-left: 28px" Width="130px"
onselectedindexchanged="fiscal_SelectedIndexChanged" >
[Code]....
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[Code]....
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