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Validating a daragrid's delete
- Thread starter bigfoot
- Start date
- Thread starter
- #3
I am using Web Matrix while waiting for Microsoft to release Visual Studio 2003 next week.
Where do I put this?
private void DataGrid1_ItemCreated(object sender, System.Web.UI.WebControls.DataGridItemEventArgs e)
{
ListItemType lit = e.Item.ItemType;
if (lit == ListItemType.Item)
{
Button btnDelete = (Button) e.Item.FindControl("btnDelete"
;
btnDelete.Attributes.Add("OnClick", "javascript: return confirm('Are you sure you want to delete this record?');"
}
}
It looks like javascript code. When I create a new sub called DataGrid1_ItemCreated, and put it in there, it gives me an error.
Where do I put this?
private void DataGrid1_ItemCreated(object sender, System.Web.UI.WebControls.DataGridItemEventArgs e)
{
ListItemType lit = e.Item.ItemType;
if (lit == ListItemType.Item)
{
Button btnDelete = (Button) e.Item.FindControl("btnDelete"
;btnDelete.Attributes.Add("OnClick", "javascript: return confirm('Are you sure you want to delete this record?');"
;}
}
It looks like javascript code. When I create a new sub called DataGrid1_ItemCreated, and put it in there, it gives me an error.
- Thread starter
- #4
The answer to getting answered -- faq855-2992
- Thread starter
- #6
So it converted it to this:
'VB
Private Sub DataGrid1_ItemCreated(sender As Object, e As System.Web.UI.WebControls.DataGridItemEventArgs)
Dim lit As ListItemType = e.Item.ItemType
If lit = ListItemType.Item Then
Dim btnDelete As Button = CType(e.Item.FindControl("btnDelete", Button)
btnDelete.Attributes.Add("OnClick", "javascript: return confirm('Are you sure you want to delete this record?');"
End If
End Sub 'DataGrid1_ItemCreated
Now I get this error:
Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.
Exception Details: System.NullReferenceException: Object reference not set to an instance of an object.
Source Error:
Line 219: If lit = ListItemType.Item Then
Line 220: Dim btnDelete As Button = CType(e.Item.FindControl("btnDelete", Button)
Line 221: btnDelete.Attributes.Add("OnClick", "javascript: return confirm('Are you sure you want to delete this record?');"
Line 222: End If
'VB
Private Sub DataGrid1_ItemCreated(sender As Object, e As System.Web.UI.WebControls.DataGridItemEventArgs)
Dim lit As ListItemType = e.Item.ItemType
If lit = ListItemType.Item Then
Dim btnDelete As Button = CType(e.Item.FindControl("btnDelete"
, Button)btnDelete.Attributes.Add("OnClick", "javascript: return confirm('Are you sure you want to delete this record?');"
End If
End Sub 'DataGrid1_ItemCreated
Now I get this error:
Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.
Exception Details: System.NullReferenceException: Object reference not set to an instance of an object.
Source Error:
Line 219: If lit = ListItemType.Item Then
Line 220: Dim btnDelete As Button = CType(e.Item.FindControl("btnDelete"
, Button)Line 221: btnDelete.Attributes.Add("OnClick", "javascript: return confirm('Are you sure you want to delete this record?');"
Line 222: End If
- Thread starter
- #8
OMG!!You are right. No, there is no control of that type. It just says delete. I am using the default code for the grid.
<asp:datagrid id="DataGrid1" runat="server" DataKeyField="OrderID" OnItemCommand="DataGrid_ItemCommand" OnEditCommand="DataGrid_Edit" OnUpdateCommand="DataGrid_Update" OnCancelCommand="DataGrid_Cancel" OnDeleteCommand="DataGrid_Delete" AllowPaging="true" PageSize="6" OnPageIndexChanged="DataGrid_Page" ForeColor="Black" BackColor="White" CellPadding="3" GridLines="None" CellSpacing="1" width="80%">
<FooterStyle backcolor="#C6C3C6"></FooterStyle>
<HeaderStyle font-bold="True" forecolor="White" backcolor="#4A3C8C"></HeaderStyle>
<PagerStyle font-size="Smaller" horizontalalign="Right" backcolor="#C6C3C6" mode="NumericPages"></PagerStyle>
<ItemStyle backcolor="#DEDFDE"></ItemStyle>
<Columns>
<asp:EditCommandColumn ButtonType="LinkButton" UpdateText="Update" CancelText="Cancel" EditText="Edit">
<ItemStyle font-size="Smaller" width="10%"></ItemStyle>
</asp:EditCommandColumn>
<asp:ButtonColumn Text="Delete" CommandName="Delete">
<ItemStyle font-size="Smaller" width="10%"></ItemStyle>
</asp:ButtonColumn>
</Columns>
</asp:datagrid>
<asp:datagrid id="DataGrid1" runat="server" DataKeyField="OrderID" OnItemCommand="DataGrid_ItemCommand" OnEditCommand="DataGrid_Edit" OnUpdateCommand="DataGrid_Update" OnCancelCommand="DataGrid_Cancel" OnDeleteCommand="DataGrid_Delete" AllowPaging="true" PageSize="6" OnPageIndexChanged="DataGrid_Page" ForeColor="Black" BackColor="White" CellPadding="3" GridLines="None" CellSpacing="1" width="80%">
<FooterStyle backcolor="#C6C3C6"></FooterStyle>
<HeaderStyle font-bold="True" forecolor="White" backcolor="#4A3C8C"></HeaderStyle>
<PagerStyle font-size="Smaller" horizontalalign="Right" backcolor="#C6C3C6" mode="NumericPages"></PagerStyle>
<ItemStyle backcolor="#DEDFDE"></ItemStyle>
<Columns>
<asp:EditCommandColumn ButtonType="LinkButton" UpdateText="Update" CancelText="Cancel" EditText="Edit">
<ItemStyle font-size="Smaller" width="10%"></ItemStyle>
</asp:EditCommandColumn>
<asp:ButtonColumn Text="Delete" CommandName="Delete">
<ItemStyle font-size="Smaller" width="10%"></ItemStyle>
</asp:ButtonColumn>
</Columns>
</asp:datagrid>
- Thread starter
- #9
- Thread starter
- #10
Still nothing! Error again.
I know what's wrong: It's looking at column 0, but it won't let me change it to column 1. What's the deal?
I must be stupid! Thia can't be that hard.
Private Sub DataGrid1_ItemCreated(sender As Object, e As System.Web.UI.WebControls.DataGridItemEventArgs)
Select Case e.Item.ItemType
Case ListItemType.Item, ListItemType.AlternatingItem, ListItemType.EditItem
Dim myTableCell As TableCell
myTableCell = e.Item.Cells(0)
Dim myDeleteButton As LinkButton
myDeleteButton = myTableCell.Controls(0)
myDeleteButton.Attributes.Add("onclick","return confirm('Are you Sure you want to delete this company?');"
End Select
End Sub 'DataGrid1_ItemCreated
<html>
<head>
</head>
<body style="FONT-FAMILY: arial">
<h2>Editable Data Grid
</h2>
<hr size="1" />
<form runat="server">
<asp:datagrid id="DataGrid1" runat="server" DataKeyField="OrderID" OnItemCommand="DataGrid_ItemCommand" OnEditCommand="DataGrid_Edit" OnUpdateCommand="DataGrid_Update" OnCancelCommand="DataGrid_Cancel" OnDeleteCommand="DataGrid_Delete" AllowPaging="True" OnPageIndexChanged="DataGrid_Page" BackColor="White" CellPadding="3" GridLines="Vertical" width="80%" OnItemCreated="DataGrid1_ItemCreated" BorderWidth="1px" BorderColor="#999999" BorderStyle="None">
<FooterStyle forecolor="Black" backcolor="#CCCCCC"></FooterStyle>
<HeaderStyle font-bold="True" forecolor="White" backcolor="#000084"></HeaderStyle>
<PagerStyle font-size="Smaller" horizontalalign="Center" forecolor="Black" backcolor="#999999" mode="NumericPages"></PagerStyle>
<SelectedItemStyle font-bold="True" forecolor="White" backcolor="#008A8C"></SelectedItemStyle>
<AlternatingItemStyle backcolor="Gainsboro"></AlternatingItemStyle>
<ItemStyle forecolor="Black" backcolor="#EEEEEE"></ItemStyle>
<Columns>
<asp:EditCommandColumn ButtonType="LinkButton" UpdateText="Update" CancelText="Cancel" EditText="Edit">
<ItemStyle font-size="Smaller" width="10%"></ItemStyle>
</asp:EditCommandColumn>
<asp:ButtonColumn Text="Delete" CommandName="Delete">
<ItemStyle font-size="Smaller" width="10%"></ItemStyle>
</asp:ButtonColumn>
</Columns>
</asp:datagrid>
<br />
<asp:LinkButton id="LinkButton1" onclick="AddNew_Click" runat="server" Text="Add new item" Font-Size="smaller"></asp:LinkButton>
<br />
<br />
<asp:Label id="Message" runat="server" ForeColor="red" width="80%" EnableViewState="false"></asp:Label>
</form>
</body>
</html>
I know what's wrong: It's looking at column 0, but it won't let me change it to column 1. What's the deal?
I must be stupid! Thia can't be that hard.
Private Sub DataGrid1_ItemCreated(sender As Object, e As System.Web.UI.WebControls.DataGridItemEventArgs)
Select Case e.Item.ItemType
Case ListItemType.Item, ListItemType.AlternatingItem, ListItemType.EditItem
Dim myTableCell As TableCell
myTableCell = e.Item.Cells(0)
Dim myDeleteButton As LinkButton
myDeleteButton = myTableCell.Controls(0)
myDeleteButton.Attributes.Add("onclick","return confirm('Are you Sure you want to delete this company?');"
End Select
End Sub 'DataGrid1_ItemCreated
<html>
<head>
</head>
<body style="FONT-FAMILY: arial">
<h2>Editable Data Grid
</h2>
<hr size="1" />
<form runat="server">
<asp:datagrid id="DataGrid1" runat="server" DataKeyField="OrderID" OnItemCommand="DataGrid_ItemCommand" OnEditCommand="DataGrid_Edit" OnUpdateCommand="DataGrid_Update" OnCancelCommand="DataGrid_Cancel" OnDeleteCommand="DataGrid_Delete" AllowPaging="True" OnPageIndexChanged="DataGrid_Page" BackColor="White" CellPadding="3" GridLines="Vertical" width="80%" OnItemCreated="DataGrid1_ItemCreated" BorderWidth="1px" BorderColor="#999999" BorderStyle="None">
<FooterStyle forecolor="Black" backcolor="#CCCCCC"></FooterStyle>
<HeaderStyle font-bold="True" forecolor="White" backcolor="#000084"></HeaderStyle>
<PagerStyle font-size="Smaller" horizontalalign="Center" forecolor="Black" backcolor="#999999" mode="NumericPages"></PagerStyle>
<SelectedItemStyle font-bold="True" forecolor="White" backcolor="#008A8C"></SelectedItemStyle>
<AlternatingItemStyle backcolor="Gainsboro"></AlternatingItemStyle>
<ItemStyle forecolor="Black" backcolor="#EEEEEE"></ItemStyle>
<Columns>
<asp:EditCommandColumn ButtonType="LinkButton" UpdateText="Update" CancelText="Cancel" EditText="Edit">
<ItemStyle font-size="Smaller" width="10%"></ItemStyle>
</asp:EditCommandColumn>
<asp:ButtonColumn Text="Delete" CommandName="Delete">
<ItemStyle font-size="Smaller" width="10%"></ItemStyle>
</asp:ButtonColumn>
</Columns>
</asp:datagrid>
<br />
<asp:LinkButton id="LinkButton1" onclick="AddNew_Click" runat="server" Text="Add new item" Font-Size="smaller"></asp:LinkButton>
<br />
<br />
<asp:Label id="Message" runat="server" ForeColor="red" width="80%" EnableViewState="false"></asp:Label>
</form>
</body>
</html>
- Thread starter
- #11
I GOT IT! I GOT IT! I GOT IT! I GOT IT! I GOT IT! I GOT IT!
Here's the reason it did not work: I needed to change the lines in the DataGrid1_ItemCreated Event..
From
Dim myDeleteButton As LinkButton
myDeleteButton = myTableCell.Controls(0)
myDeleteButton.Attributes.Add("onclick","return confirm('Are you Sure you want to delete this company?');"
To
Dim mydeleteButton As LinkButton = e.Item.Cells(1).Controls(0)
myDeleteButton.Attributes.Add("onclick","return confirm('Are you Sure you want to delete this company?');"
I HAD to reference Cells(1), and not Cells(0).
Ahhhhhhhhhhhhhhhhh, no hair left, but project is 1 more step to finish.
Here's the reason it did not work: I needed to change the lines in the DataGrid1_ItemCreated Event..
From
Dim myDeleteButton As LinkButton
myDeleteButton = myTableCell.Controls(0)
myDeleteButton.Attributes.Add("onclick","return confirm('Are you Sure you want to delete this company?');"
To
Dim mydeleteButton As LinkButton = e.Item.Cells(1).Controls(0)
myDeleteButton.Attributes.Add("onclick","return confirm('Are you Sure you want to delete this company?');"
I HAD to reference Cells(1), and not Cells(0).
Ahhhhhhhhhhhhhhhhh, no hair left, but project is 1 more step to finish.
- Thread starter
- #12
![[2thumbsup]](/data/assets/smilies/2thumbsup.gif "[2thumbsup] [2thumbsup]")
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