ASPxCardView.CardDeleting Event
Enables you to prevent a card from being deleted.
Namespace: DevExpress.Web
Assembly: DevExpress.Web.v18.2.dll
Declaration
public event ASPxDataDeletingEventHandler CardDeleting
Public Event CardDeleting As ASPxDataDeletingEventHandler
Event Data
The CardDeleting event's data class is ASPxDataDeletingEventArgs.
The following properties provide information specific to this event:
| Property |
Description |
| Cancel |
Gets or sets a value indicating whether the event should be canceled.
|
| Keys |
Gets a dictionary of field name/value pairs that represent the primary key of the row to delete.
|
| Values |
Gets a dictionary of the non-key field name/value pairs for the row to delete.
|
The CardDeleting event occurs when an end-user has clicked the Delete command or the ASPxCardView.DeleteCard method has been called. To cancel the delete operation, set the event parameter’s Cancel property to true.
After a card has been deleted, the ASPxCardView.CardDeleted event is raised.
Example
This example demonstrates how to create an unbound column that calculates the sum of other columns and changes its values on the fly when an end-user changes any grid values using the Batch edit mode.
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" %>
<%@ Register assembly="DevExpress.Web.v15.2, Version=15.2.11.0, Culture=neutral, PublicKeyToken=b88d1754d700e49a" namespace="DevExpress.Web" tagprefix="dx" %>
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title></title>
<script type="text/javascript">
function OnBatchEditEndEditing(s, e) {
window.setTimeout(function () {
var price = s.batchEditApi.GetCellValue(e.visibleIndex, "Price");
var quantity = s.batchEditApi.GetCellValue(e.visibleIndex, "Quantity");
s.batchEditApi.SetCellValue(e.visibleIndex, "Sum", price * quantity);
}, 10);
}
</script>
</head>
<body>
<form id="form1" runat="server">
<div>
<dx:ASPxCardView ID="Grid" runat="server" KeyFieldName="ID" OnBatchUpdate="ASPxCardView1_BatchUpdate"
OnCardInserting="ASPxCardView1_CardInserting" OnCardUpdating="ASPxCardView1_CardUpdating" OnCardDeleting="ASPxCardView1_CardDeleting"
OnCustomUnboundColumnData="ASPxCardView1_CustomUnboundColumnData" AutoGenerateColumns="False">
<ClientSideEvents BatchEditEndEditing="OnBatchEditEndEditing" />
<SettingsEditing Mode="Batch">
</SettingsEditing>
<Columns>
<dx:CardViewSpinEditColumn FieldName="Quantity" VisibleIndex="0">
<PropertiesSpinEdit DisplayFormatString="g">
</PropertiesSpinEdit>
</dx:CardViewSpinEditColumn>
<dx:CardViewSpinEditColumn FieldName="Price" VisibleIndex="1">
<PropertiesSpinEdit DisplayFormatString="g">
</PropertiesSpinEdit>
</dx:CardViewSpinEditColumn>
<dx:CardViewTextColumn FieldName="Sum" ReadOnly="True" UnboundType="Decimal" VisibleIndex="2">
</dx:CardViewTextColumn>
</Columns>
<CardLayoutProperties>
<Items>
<dx:CardViewCommandLayoutItem HorizontalAlign="Right" ShowDeleteButton="True" ShowEditButton="True" ShowNewButton="True">
</dx:CardViewCommandLayoutItem>
<dx:CardViewColumnLayoutItem ColumnName="Quantity">
</dx:CardViewColumnLayoutItem>
<dx:CardViewColumnLayoutItem ColumnName="Price">
</dx:CardViewColumnLayoutItem>
<dx:CardViewColumnLayoutItem ColumnName="Sum">
</dx:CardViewColumnLayoutItem>
<dx:EditModeCommandLayoutItem HorizontalAlign="Right">
</dx:EditModeCommandLayoutItem>
</Items>
</CardLayoutProperties>
</dx:ASPxCardView>
</div>
</form>
</body>
</html>
using System;
using System.Collections.Generic;
using System.Collections.Specialized;
using System.ComponentModel;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using DevExpress.Web;
public partial class _Default : System.Web.UI.Page
{
protected List<GridDataItem> GridData
{
get
{
var key = "34FAA431-CF79-4869-9488-93F6AAE81263";
if (!IsPostBack || Session[key] == null)
Session[key] = Enumerable.Range(1, 100).Select(i => new GridDataItem
{
ID = i,
Quantity = i * 10 % 7 % i,
Price = i * 0.5 % 3
}).ToList();
return (List<GridDataItem>)Session[key];
}
}
protected void Page_Load(object sender, EventArgs e)
{
Grid.DataSource = GridData;
Grid.DataBind();
}
protected void ASPxCardView1_BatchUpdate(object sender, DevExpress.Web.Data.ASPxDataBatchUpdateEventArgs e)
{
foreach (var args in e.InsertValues)
InsertNewItem(args.NewValues);
foreach (var args in e.UpdateValues)
UpdateItem(args.Keys, args.NewValues);
foreach (var args in e.DeleteValues)
DeleteItem(args.Keys, args.Values);
e.Handled = true;
}
protected void ASPxCardView1_CardInserting(object sender, DevExpress.Web.Data.ASPxDataInsertingEventArgs e)
{
InsertNewItem(e.NewValues);
CancelEditing(e);
}
protected void ASPxCardView1_CardUpdating(object sender, DevExpress.Web.Data.ASPxDataUpdatingEventArgs e)
{
UpdateItem(e.Keys, e.NewValues);
CancelEditing(e);
}
protected void ASPxCardView1_CardDeleting(object sender, DevExpress.Web.Data.ASPxDataDeletingEventArgs e)
{
DeleteItem(e.Keys, e.Values);
CancelEditing(e);
}
protected void ASPxCardView1_CustomUnboundColumnData(object sender, DevExpress.Web.ASPxCardViewColumnDataEventArgs e)
{
if (e.Column.FieldName == "Sum")
{
decimal price = Convert.ToDecimal(e.GetListSourceFieldValue("Price"));
int quantity = Convert.ToInt32(e.GetListSourceFieldValue("Quantity"));
e.Value = price * quantity;
}
}
protected GridDataItem InsertNewItem(OrderedDictionary newValues)
{
var item = new GridDataItem() { ID = GridData.Count };
LoadNewValues(item, newValues);
GridData.Add(item);
return item;
}
protected GridDataItem UpdateItem(OrderedDictionary keys, OrderedDictionary newValues)
{
var id = Convert.ToInt32(keys["ID"]);
var item = GridData.First(i => i.ID == id);
LoadNewValues(item, newValues);
return item;
}
protected GridDataItem DeleteItem(OrderedDictionary keys, OrderedDictionary values)
{
var id = Convert.ToInt32(keys["ID"]);
var item = GridData.First(i => i.ID == id);
GridData.Remove(item);
return item;
}
protected void LoadNewValues(GridDataItem item, OrderedDictionary values)
{
item.Quantity = Convert.ToInt32(values["Quantity"]);
item.Price = Convert.ToDouble(values["Price"]);
}
protected void CancelEditing(CancelEventArgs e)
{
e.Cancel = true;
Grid.CancelEdit();
}
public class GridDataItem
{
public int ID { get; set; }
public int Quantity { get; set; }
public double Price { get; set; }
}
}
Imports System
Imports System.Collections.Generic
Imports System.Collections.Specialized
Imports System.ComponentModel
Imports System.Linq
Imports System.Web
Imports System.Web.UI
Imports System.Web.UI.WebControls
Imports DevExpress.Web
Partial Public Class _Default
Inherits System.Web.UI.Page
Protected ReadOnly Property GridData() As List(Of GridDataItem)
Get
Dim key = "34FAA431-CF79-4869-9488-93F6AAE81263"
If (Not IsPostBack) OrElse Session(key) Is Nothing Then
Session(key) = Enumerable.Range(1, 100).Select(Function(i) New GridDataItem With {.ID = i, .Quantity = i * 10 Mod 7 Mod i, .Price = i * 0.5 Mod 3}).ToList()
End If
Return DirectCast(Session(key), List(Of GridDataItem))
End Get
End Property
Protected Sub Page_Load(ByVal sender As Object, ByVal e As EventArgs)
Grid.DataSource = GridData
Grid.DataBind()
End Sub
Protected Sub ASPxCardView1_BatchUpdate(ByVal sender As Object, ByVal e As DevExpress.Web.Data.ASPxDataBatchUpdateEventArgs)
For Each args In e.InsertValues
InsertNewItem(args.NewValues)
Next args
For Each args In e.UpdateValues
UpdateItem(args.Keys, args.NewValues)
Next args
For Each args In e.DeleteValues
DeleteItem(args.Keys, args.Values)
Next args
e.Handled = True
End Sub
Protected Sub ASPxCardView1_CardInserting(ByVal sender As Object, ByVal e As DevExpress.Web.Data.ASPxDataInsertingEventArgs)
InsertNewItem(e.NewValues)
CancelEditing(e)
End Sub
Protected Sub ASPxCardView1_CardUpdating(ByVal sender As Object, ByVal e As DevExpress.Web.Data.ASPxDataUpdatingEventArgs)
UpdateItem(e.Keys, e.NewValues)
CancelEditing(e)
End Sub
Protected Sub ASPxCardView1_CardDeleting(ByVal sender As Object, ByVal e As DevExpress.Web.Data.ASPxDataDeletingEventArgs)
DeleteItem(e.Keys, e.Values)
CancelEditing(e)
End Sub
Protected Sub ASPxCardView1_CustomUnboundColumnData(ByVal sender As Object, ByVal e As DevExpress.Web.ASPxCardViewColumnDataEventArgs)
If e.Column.FieldName = "Sum" Then
Dim price As Decimal = Convert.ToDecimal(e.GetListSourceFieldValue("Price"))
Dim quantity As Integer = Convert.ToInt32(e.GetListSourceFieldValue("Quantity"))
e.Value = price * quantity
End If
End Sub
Protected Function InsertNewItem(ByVal newValues As OrderedDictionary) As GridDataItem
Dim item = New GridDataItem() With {.ID = GridData.Count}
LoadNewValues(item, newValues)
GridData.Add(item)
Return item
End Function
Protected Function UpdateItem(ByVal keys As OrderedDictionary, ByVal newValues As OrderedDictionary) As GridDataItem
Dim id_Renamed = Convert.ToInt32(keys("ID"))
Dim item = GridData.First(Function(i) i.ID = id_Renamed)
LoadNewValues(item, newValues)
Return item
End Function
Protected Function DeleteItem(ByVal keys As OrderedDictionary, ByVal values As OrderedDictionary) As GridDataItem
Dim id_Renamed = Convert.ToInt32(keys("ID"))
Dim item = GridData.First(Function(i) i.ID = id_Renamed)
GridData.Remove(item)
Return item
End Function
Protected Sub LoadNewValues(ByVal item As GridDataItem, ByVal values As OrderedDictionary)
item.Quantity = Convert.ToInt32(values("Quantity"))
item.Price = Convert.ToDouble(values("Price"))
End Sub
Protected Sub CancelEditing(ByVal e As CancelEventArgs)
e.Cancel = True
Grid.CancelEdit()
End Sub
Public Class GridDataItem
Public Property ID() As Integer
Public Property Quantity() As Integer
Public Property Price() As Double
End Class
End Class
<%@ Page Language="vb" AutoEventWireup="true" CodeFile="Default.aspx.vb" Inherits="_Default" %>
<%@ Register assembly="DevExpress.Web.v15.2, Version=15.2.11.0, Culture=neutral, PublicKeyToken=b88d1754d700e49a" namespace="DevExpress.Web" tagprefix="dx" %>
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title></title>
<script type="text/javascript">
function OnBatchEditEndEditing(s, e) {
window.setTimeout(function () {
var price = s.batchEditApi.GetCellValue(e.visibleIndex, "Price");
var quantity = s.batchEditApi.GetCellValue(e.visibleIndex, "Quantity");
s.batchEditApi.SetCellValue(e.visibleIndex, "Sum", price * quantity);
}, 10);
}
</script>
</head>
<body>
<form id="form1" runat="server">
<div>
<dx:ASPxCardView ID="Grid" runat="server" KeyFieldName="ID" OnBatchUpdate="ASPxCardView1_BatchUpdate"
OnCardInserting="ASPxCardView1_CardInserting" OnCardUpdating="ASPxCardView1_CardUpdating" OnCardDeleting="ASPxCardView1_CardDeleting"
OnCustomUnboundColumnData="ASPxCardView1_CustomUnboundColumnData" AutoGenerateColumns="False">
<ClientSideEvents BatchEditEndEditing="OnBatchEditEndEditing" />
<SettingsEditing Mode="Batch">
</SettingsEditing>
<Columns>
<dx:CardViewSpinEditColumn FieldName="Quantity" VisibleIndex="0">
<PropertiesSpinEdit DisplayFormatString="g">
</PropertiesSpinEdit>
</dx:CardViewSpinEditColumn>
<dx:CardViewSpinEditColumn FieldName="Price" VisibleIndex="1">
<PropertiesSpinEdit DisplayFormatString="g">
</PropertiesSpinEdit>
</dx:CardViewSpinEditColumn>
<dx:CardViewTextColumn FieldName="Sum" ReadOnly="True" UnboundType="Decimal" VisibleIndex="2">
</dx:CardViewTextColumn>
</Columns>
<CardLayoutProperties>
<Items>
<dx:CardViewCommandLayoutItem HorizontalAlign="Right" ShowDeleteButton="True" ShowEditButton="True" ShowNewButton="True">
</dx:CardViewCommandLayoutItem>
<dx:CardViewColumnLayoutItem ColumnName="Quantity">
</dx:CardViewColumnLayoutItem>
<dx:CardViewColumnLayoutItem ColumnName="Price">
</dx:CardViewColumnLayoutItem>
<dx:CardViewColumnLayoutItem ColumnName="Sum">
</dx:CardViewColumnLayoutItem>
<dx:EditModeCommandLayoutItem HorizontalAlign="Right">
</dx:EditModeCommandLayoutItem>
</Items>
</CardLayoutProperties>
</dx:ASPxCardView>
</div>
</form>
</body>
</html>
See Also