DataGrid Footer DropDownList OnSelectedIndexChanged

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DataGrid Footer DropDownList OnSelectedIndexChanged

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DataGrid Footer DropDownList OnSelectedIndexChanged

Postby » Fri, 09 Nov 2007 23:08:44 GMT 

I have 2 dropdownlists in the Footer of a datagrid:

ddlStartTime and ddlEndTime.  Both contain values like "1:00 AM", "1:15 AM", 
"1:30 AM", etc.

There is also a label named lblTimeDiff.

 I need to dynamically popolate lblTimeDiff.Text (during 
onselectedindexchanged of ddlEndTime) with the difference in minutes between 
ddlStart and ddlEnd in the Footer.  I'm sure javascript will come into play 
here but I have absolutely no idea how to define the eventhandler and 
scripting.  I can do this in tsql using datediff(mi, start_time, end_time), 
just can't seem to dynamically put the return value in the label without a 
postback to the server.  Any ideas?  Thank you very much.
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Similar Threads:

1.DataGrid with DropDownLists not responding to OnSelectedIndexChanged 

Hello group,

   I have a TemplateColumn containing a DropDownList in my DataGrid. I added
an OnSelectedIndexChanged property in that DropDownList, but I can see in
debug mode that changing the selection will not call my function defined in
OnSelectedIndexChanged (the page reloads, I didn't forget
AutoPostBack=true).
   Is this normal ? Is there a way around it ?

Karine

2.How raise an OnSelectedIndexChanged for an DropDownList in footer of a DataGrid? 

Hi!

In a DataGrid I have a 'Add New'-field in the footer. I
want to hide an control (txtNewFe_name) if the value of
cmbNewFe_num is >0. How do I do that? The
OnSelectedIndexChanged does not seem to response to
anything, even though I tryed with just:

Function CheckFe_num()
    Response.Write("Hello World!")
End Function

Best regards / Bengt-Erik

MyPage.aspx
........
........
<FooterTemplate>
    <asp:DropDownList id="cmbNewFe_num" DataSource="<%#
PopulateNewFe_num() %>" DataValueField="Id"
DataTextField="Fe_num" runat="server"
OnSelectedIndexChanged="<%# CheckFe_num() %>"/>
</FooterTemplate>
........
........
........
<FooterTemplate>
    <asp:TextBox id="txtNewFe_name" runat="server"
TextMode="MultiLine" />
</FooterTemplate>
.......
.......

MyPage.aspx.vb
.....
.....
Function CheckFe_num()
    If CType(FindControl("cmbFe_num"),
DropDownList).SelectedItem.Value > 0 Then
        CType(FindControl("txtNewFe_name"), TextBox).Text
= ""
        CType(FindControl("txtNewFe_name"),
TextBox).Visible = False
    Else
        CType(FindControl("txtNewFe_name"),
TextBox).Visible = True
    End If
End Function
......
......

3.How do I raise an OnSelectedIndexChanged for an DropDownList in the footer of a DataGrid? 

Hi!

In a DataGrid I have a 'Add New'-field in the footer. I want to hide an
control (txtNewFe_name) if the value of cmbNewFe_num is >0. How do I do
that? The OnSelectedIndexChanged does not seem to response to anything, even
though I tryed with just:

Function CheckFe_num()
    Response.Write("Hello World!")
End Function

Best regards / Bengt-Erik

MyPage.aspx
.......
.......
<FooterTemplate>
    <asp:DropDownList id="cmbNewFe_num" DataSource="<%# PopulateNewFe_num()
%>" DataValueField="Id" DataTextField="Fe_num" runat="server"
OnSelectedIndexChanged="<%# CheckFe_num() %>"/>
</FooterTemplate>
.......
.......
.......
<FooterTemplate>
    <asp:TextBox id="txtNewFe_name" runat="server" TextMode="MultiLine" />
</FooterTemplate>
......
......

MyPage.aspx.vb
....
....
Function CheckFe_num()
    If CType(FindControl("cmbFe_num"), DropDownList).SelectedItem.Value > 0
Then
        CType(FindControl("txtNewFe_name"), TextBox).Text = ""
        CType(FindControl("txtNewFe_name"), TextBox).Visible = False
    Else
        CType(FindControl("txtNewFe_name"), TextBox).Visible = True
    End If
End Function
.....
.....

4.How raise an OnSelectedIndexChanged for an DropDownList in footer of a DataGrid? 

Hi!

In a DataGrid I have a 'Add New'-field in the footer. I 
want to hide an control (txtNewFe_name) if the value of 
cmbNewFe_num is >0. How do I do that? The 
OnSelectedIndexChanged does not seem to response to 
anything, even though I tryed with just:

Function CheckFe_num()
    Response.Write("Hello World!")
End Function

Best regards / Bengt-Erik

MyPage.aspx
.......
.......
<FooterTemplate>
    <asp:DropDownList id="cmbNewFe_num" DataSource="<%# 
PopulateNewFe_num() %>" DataValueField="Id" 
DataTextField="Fe_num" runat="server" 
OnSelectedIndexChanged="<%# CheckFe_num() %>"/>
</FooterTemplate>
.......
.......
.......
<FooterTemplate>
    <asp:TextBox id="txtNewFe_name" runat="server" 
TextMode="MultiLine" />
</FooterTemplate>
......
......

MyPage.aspx.vb
....
....
Function CheckFe_num()
    If CType(FindControl("cmbFe_num"), 
DropDownList).SelectedItem.Value > 0 Then
        CType(FindControl("txtNewFe_name"), TextBox).Text 
= ""
        CType(FindControl("txtNewFe_name"), 
TextBox).Visible = False
    Else
        CType(FindControl("txtNewFe_name"), 
TextBox).Visible = True
    End If
End Function
.....
.....

5.Can't databind a dropdownlist in the footer of a datagrid 

Hi there, I'm trying to databind a dropdownlist that is in the footer row of a datagrid and I can't get it to work. Here's a chunk of the code:

FP.Intranet.Portal.transloadDB lorries = new FP.Intranet.Portal.transloadDB();
//this next line definitely works as I have used the dsLorries.GetXML to debug and 
//the dataset is definitely populated.
DataSet dsLorries = lorries.GetLorries("BB");
lstLorries.DataSource = dsLorries;
lstLorries.DataTextField = "rl_load_name";
lstLorries.DataBind();

I've put it in the datagrid's itemDatabound event and it just shows up empty.

Please Help!


-- 
Tim McOwan

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