atljarman
asked on
ASP .Net GridView RowUpdating on DropDownList
Hi,
I have a menu maker program that you can add various menu items to an xml file. To update the items, I currently have text fields for all of the fields. Two of the fields are True/False and I want to put a DropDownList in the table.
I have my code working so that the current value shows in the first of the two True/False columns (trying one as a test). When I go to edit the column, the drop down list appears correctly. When I go to update the value in the row, the value returns blank/null. My guess is that I am not using the correct VB to retrieve the value from the dropdown list. I've commented out the VB options that haven't worked and included them here as I've spent too long trying to figure it out.
Any help would greatly be appreciated.
I have a menu maker program that you can add various menu items to an xml file. To update the items, I currently have text fields for all of the fields. Two of the fields are True/False and I want to put a DropDownList in the table.
I have my code working so that the current value shows in the first of the two True/False columns (trying one as a test). When I go to edit the column, the drop down list appears correctly. When I go to update the value in the row, the value returns blank/null. My guess is that I am not using the correct VB to retrieve the value from the dropdown list. I've commented out the VB options that haven't worked and included them here as I've spent too long trying to figure it out.
Any help would greatly be appreciated.
Protected Sub GridView1_RowUpdating(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.GridViewUpdateEventArgs) Handles GridView1.RowUpdating
Dim i As Integer = GridView1.Rows(e.RowIndex).DataItemIndex
'Numbers are cells are relative to the columns in gridview
Dim strn As String = CType(GridView1.Rows(e.RowIndex).Cells(0).Controls(0), TextBox).Text
Dim strtext As String = CType(GridView1.Rows(e.RowIndex).Cells(1).Controls(0), TextBox).Text
Dim strurl As String = CType(GridView1.Rows(e.RowIndex).Cells(2).Controls(0), TextBox).Text
Dim strdescr As String = CType(GridView1.Rows(e.RowIndex).Cells(3).Controls(0), TextBox).Text
Dim strparent As String = CType(GridView1.Rows(e.RowIndex).Cells(4).Controls(0), TextBox).Text
Dim strdisplay As String = CType(GridView1.Rows(e.RowIndex).Cells(5).FindControl("listdisplay"), DropDownList).Text
'Dim ddl as DropDownList = CType(row.FindControl("listdisplay", DropDownList)
'Dim strdisplay as String = ddl.Text
'Dim strdisplay as String = CType(GridView1.Rows(e.RowIndex).Cells(5).FindControl("listdisplay"), DropDownList)
'Dim strdisplay As String = CType(GridView1.Rows(e.RowIndex).Cells(5).FindControl("listdisplay"), DropDownList).SelectedItem.Value
Dim strmembers As String = CType(GridView1.Rows(e.RowIndex).Cells(6).Controls(0), TextBox).Text
GridView1.EditIndex = -1
BindGrid()
Dim oDs As DataSet = GridView1.DataSource
'Numbers are relative to the xml file.
oDs.Tables(0).Rows(i).Item(0) = Strn
oDs.Tables(0).Rows(i).Item(1) = Strtext
oDs.Tables(0).Rows(i).Item(2) = Strurl
oDs.Tables(0).Rows(i).Item(3) = Strdescr
oDs.Tables(0).Rows(i).Item(4) = Strparent
oDs.Tables(0).Rows(i).Item(5) = Strdisplay
oDs.Tables(0).Rows(i).Item(6) = Strmembers
oDs.WriteXml(Request.PhysicalApplicationPath + "cms\menusource.xml")
BindGrid()
End Sub
<asp:GridView ID="GridView1" runat="server" AllowPaging="True" PageSize="10" AutoGenerateColumns="False"
OnDeleteCommand="articleList_DeleteFile">
<Columns>
<asp:BoundField HeaderText="N" DataField="n" ></asp:BoundField>
<asp:BoundField HeaderText="Link<br />Text" DataField="text" HtmlEncode="false"></asp:BoundField>
<asp:BoundField HeaderText="Page URL<br /><div style='font-size:9px;'>(~\ indicates base of site)</div>" DataField="url" HtmlEncode="false"></asp:BoundField>
<asp:BoundField HeaderText="Page<br />Description<br /><div style='font-size:9px;'>(Section 508)</div>" DataField="descr" HtmlEncode="false"></asp:BoundField>
<asp:BoundField HeaderText="Page<br />Parent<br /><div style='font-size:9px;'>(Optional)</div>" DataField="parent" HtmlEncode="false"></asp:BoundField>
<asp:TemplateField HeaderText="Display<br />Page?<br /><div style='font-size:9px;'>(Optional)</div>" >
<EditItemTemplate>
<ItemTemplate>
<asp:DropDownList ID="listdisplay" runat="server" SelectedValue='<%# Bind("display") %>'>
<asp:ListItem Text="True" Value="True"></asp:ListItem>
<asp:ListItem Text="False" Value="False"></asp:ListItem>
</asp:DropDownList>
</ItemTemplate>
</EditItemTemplate>
<ItemTemplate>
<asp:BoundField HeaderText="Display<br />Page?<br /><div style='font-size:9px;'>(Optional)</div>" DataField="display" HtmlEncode="false"></asp:BoundField>
</ItemTemplate>
</asp:TemplateField>
<asp:BoundField HeaderText="Members<br />Only?<br /><div style='font-size:9px;'>(Optional)</div>" DataField="members" HtmlEncode="false"></asp:BoundField>
<asp:ButtonField CommandName="Test" Text="Add" HeaderText="Add" />
<asp:CommandField ShowEditButton="True" HeaderText="Edit" />
<asp:CommandField ShowDeleteButton="True" HeaderText="Delete" />
<asp:ButtonField CommandName="Up" Text="Up" />
<asp:ButtonField CommandName="Dn" Text="Dn" />
</Columns>
</asp:GridView>ASKER
Infomaniac, this is already in the code.
If Page.IsPostBack = False Then
BindGrid()
End If
All code seems to be working except when trying to pull the value from the DropDownList.
If Page.IsPostBack = False Then
BindGrid()
End If
All code seems to be working except when trying to pull the value from the DropDownList.
ASKER CERTIFIED SOLUTION
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ASKER
I guess I didn't check the backend to see that the xml file was updating. I've allowed paging to ten items. I have BindGrid() at the bottom of the code which re-binds the xml file. It doesn't show the value correctly. Should the value be displayed in a label or a textbox in the normal state (during non edit times.)
Protected Sub GridView1_RowUpdating(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.GridViewUpdateEventArgs) Handles GridView1.RowUpdating
Dim i As Integer = GridView1.Rows(e.RowIndex).DataItemIndex
Dim strn As String = CType(GridView1.Rows(e.RowIndex).Cells(0).Controls(0), TextBox).Text
Dim strtext As String = CType(GridView1.Rows(e.RowIndex).Cells(1).Controls(0), TextBox).Text
Dim strurl As String = CType(GridView1.Rows(e.RowIndex).Cells(2).Controls(0), TextBox).Text
Dim strdescr As String = CType(GridView1.Rows(e.RowIndex).Cells(3).Controls(0), TextBox).Text
Dim strparent As String = CType(GridView1.Rows(e.RowIndex).Cells(4).Controls(0), TextBox).Text
'Dim strdisplay As String = CType(GridView1.Rows(e.RowIndex).Cells(5).FindControl("listdisplay"), DropDownList).Text
Dim strdisplay As String = CType(GridView1.Rows(e.RowIndex).Cells(5).FindControl("listdisplay"), DropDownList).SelectedValue
'Dim ddl as DropDownList = CType(row.FindControl("listdisplay", DropDownList)
'Dim strdisplay as String = ddl.Text
'Dim strdisplay as String = CType(GridView1.Rows(e.RowIndex).Cells(5).FindControl("listdisplay"), DropDownList)
'Dim strdisplay As String = CType(GridView1.Rows(e.RowIndex).Cells(5).FindControl("listdisplay"), DropDownList).SelectedItem.Value
Dim strmembers As String = CType(GridView1.Rows(e.RowIndex).Cells(6).Controls(0), TextBox).Text
GridView1.EditIndex = -1
BindGrid()
Dim oDs As DataSet = GridView1.DataSource
'Numbers are relative to the xml file.
oDs.Tables(0).Rows(i).Item(0) = Strn
oDs.Tables(0).Rows(i).Item(1) = Strtext
oDs.Tables(0).Rows(i).Item(2) = Strurl
oDs.Tables(0).Rows(i).Item(3) = Strdescr
oDs.Tables(0).Rows(i).Item(4) = Strparent
oDs.Tables(0).Rows(i).Item(5) = Strdisplay
oDs.Tables(0).Rows(i).Item(6) = Strmembers
oDs.WriteXml(Request.PhysicalApplicationPath + "cms\menusource.xml")
BindGrid()
End Sub
<asp:GridView ID="GridView1" runat="server" AllowPaging="True" PageSize="10" AutoGenerateColumns="False"
OnDeleteCommand="articleList_DeleteFile">
<Columns>
<asp:BoundField HeaderText="N" DataField="n" ></asp:BoundField>
<asp:BoundField HeaderText="Link<br />Text" DataField="text" HtmlEncode="false"></asp:BoundField>
<asp:BoundField HeaderText="Page URL<br /><div style='font-size:9px;'>(~\ indicates base of site)</div>" DataField="url" HtmlEncode="false"></asp:BoundField>
<asp:BoundField HeaderText="Page<br />Description<br /><div style='font-size:9px;'>(Section 508)</div>" DataField="descr" HtmlEncode="false"></asp:BoundField>
<asp:BoundField HeaderText="Page<br />Parent<br /><div style='font-size:9px;'>(Optional)</div>" DataField="parent" HtmlEncode="false"></asp:BoundField>
<asp:TemplateField HeaderText="Display<br />Page?<br /><div style='font-size:9px;'>(Optional)</div>" >
<EditItemTemplate>
<ItemTemplate>
<asp:DropDownList ID="listdisplay" runat="server" SelectedValue='<%# Bind("display") %>'>
<asp:ListItem Text="True" Value="True"></asp:ListItem>
<asp:ListItem Text="False" Value="False"></asp:ListItem>
</asp:DropDownList>
</ItemTemplate>
</EditItemTemplate>
<ItemTemplate>
<asp:BoundField HeaderText="Display<br />Page?<br /><div style='font-size:9px;'>(Optional)</div>" DataField="display" HtmlEncode="false"></asp:BoundField>
</ItemTemplate>
</asp:TemplateField>
<asp:BoundField HeaderText="Members<br />Only?<br /><div style='font-size:9px;'>(Optional)</div>" DataField="members" HtmlEncode="false"></asp:BoundField>
<asp:ButtonField CommandName="Test" Text="Add" HeaderText="Add" />
<asp:CommandField ShowEditButton="True" HeaderText="Edit" />
<asp:CommandField ShowDeleteButton="True" HeaderText="Delete" />
<asp:ButtonField CommandName="Up" Text="Up" />
<asp:ButtonField CommandName="Dn" Text="Dn" />
</Columns>
</asp:GridView>
If you bind the grid in this event, the update operation will not work
SOLUTION
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ASKER
I've accepted my own comment because hdesouky did identify the correct property to use. However, he/she did not identify the correct coding in the gridview (which could not have been forseen). In my last post, I included what I am currently using which is a little more complex than the initial question.
Please add the below code in Page Load before binding the grid..
If Not IsPostBack Then
Bind the grid
End If