CardViewCustomCommandButton() Constructor

Initializes a new instance of the CardViewCustomCommandButton class with default settings.

Namespace: DevExpress.Web

Assembly: DevExpress.Web.v21.2.dll

NuGet Package: DevExpress.Web

Declaration

C#

public CardViewCustomCommandButton()

VB.NET

Public Sub New

Example

The following example handles the CommandButtonInitialize and CustomButtonInitialize events to specify the CommandButtons and Custom CommandButtons properties. The DataRow’s VisibleIndex property and criteria (set based on field values) are used to determine button visibility.

View Example

Default.aspx (C#)

<dx:ASPxCardView ID="ASPxCardView1" runat="server" DataSourceID="AccessDataSource1"         
    OnCustomButtonInitialize="ASPxCardView1_CustomButtonInitialize" 
    OnCommandButtonInitialize="ASPxCardView1_CommandButtonInitialize" 
    KeyFieldName="ProductID" AutoGenerateColumns="False">
    <ClientSideEvents CustomButtonClick="function(s, e) {alert('keyValue = ' + s.GetCardKey(e.visibleIndex));}" />
    <SettingsBehavior AllowFocusedCard="true" />
    <Columns>
        <dx:CardViewTextColumn FieldName="ProductID" VisibleIndex="2" ReadOnly="True">
        </dx:CardViewTextColumn>
        <dx:CardViewTextColumn FieldName="ProductName" VisibleIndex="0">
        </dx:CardViewTextColumn>
        <dx:CardViewTextColumn FieldName="UnitPrice" VisibleIndex="1">
        </dx:CardViewTextColumn>
    </Columns>
    <CardLayoutProperties>
        <Items>
            <dx:CardViewCommandLayoutItem HorizontalAlign="Right" ShowDeleteButton="True" ShowEditButton="True">
            </dx:CardViewCommandLayoutItem>
            <dx:CardViewColumnLayoutItem ColumnName="ProductID">
            </dx:CardViewColumnLayoutItem>
            <dx:CardViewColumnLayoutItem ColumnName="Product Name">
            </dx:CardViewColumnLayoutItem>
            <dx:CardViewColumnLayoutItem ColumnName="UnitPrice">
            </dx:CardViewColumnLayoutItem>                
        </Items>
    </CardLayoutProperties>        
</dx:ASPxCardView>  

Default.aspx.cs

using System;
using System.Collections.Generic;
using System.Data;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using DevExpress.Utils;
using DevExpress.Web;

public partial class _Default : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
            (ASPxCardView1.CardLayoutProperties.Items[0] as CardViewCommandLayoutItem).CustomButtons.Add(CreateCustomButton());
        }
    }

    CardViewCustomCommandButton CreateCustomButton()
    {
        CardViewCustomCommandButton customBtn = new CardViewCustomCommandButton();
        customBtn.ID = "CustomBtn";
        customBtn.Text = "Custom button";
        return customBtn;
    }

    protected void ASPxCardView1_CommandButtonInitialize(object sender, ASPxCardViewCommandButtonEventArgs e)
    {
        if (e.VisibleIndex == -1) return;

        switch (e.ButtonType)
        {
            case CardViewCommandButtonType.Edit:
                e.Visible = EditButtonVisibleCriteria((ASPxCardView)sender, e.VisibleIndex);
                break;
            case CardViewCommandButtonType.Delete:
                e.Visible = DeleteButtonVisibleCriteria((ASPxCardView)sender, e.VisibleIndex);
                break;
        }
    }
    private bool EditButtonVisibleCriteria(ASPxCardView grid, int visibleIndex)
    {
        object card = grid.GetDataRow(visibleIndex);
        return ((DataRow)card)["ProductName"].ToString().Contains("a");
    }
    private bool DeleteButtonVisibleCriteria(ASPxCardView grid, int visibleIndex)
    {
        object card = grid.GetDataRow(visibleIndex);
        return ((DataRow)card)["ProductName"].ToString().Contains("b");
    }
    protected void ASPxCardView1_CustomButtonInitialize(object sender, ASPxCardViewCustomCommandButtonEventArgs e)
    {
        if (e.VisibleIndex == -1) return;

        if (e.ButtonID == "CustomBtn" && e.VisibleIndex % 2 != 0)
            e.Visible = DefaultBoolean.False;
    }
}

Default.aspx.vb

Imports System
Imports System.Collections.Generic
Imports System.Data
Imports System.Linq
Imports System.Web
Imports System.Web.UI
Imports System.Web.UI.WebControls
Imports DevExpress.Utils
Imports DevExpress.Web

Partial Public Class _Default
    Inherits System.Web.UI.Page

    Protected Sub Page_Load(ByVal sender As Object, ByVal e As EventArgs)
        If Not IsPostBack Then
            TryCast(ASPxCardView1.CardLayoutProperties.Items(0), CardViewCommandLayoutItem).CustomButtons.Add(CreateCustomButton())
        End If
    End Sub

    Private Function CreateCustomButton() As CardViewCustomCommandButton
        Dim customBtn As New CardViewCustomCommandButton()
        customBtn.ID = "CustomBtn"
        customBtn.Text = "Custom button"
        Return customBtn
    End Function

    Protected Sub ASPxCardView1_CommandButtonInitialize(ByVal sender As Object, ByVal e As ASPxCardViewCommandButtonEventArgs)
        If e.VisibleIndex = -1 Then
            Return
        End If

        Select Case e.ButtonType
            Case CardViewCommandButtonType.Edit
                e.Visible = EditButtonVisibleCriteria(DirectCast(sender, ASPxCardView), e.VisibleIndex)
            Case CardViewCommandButtonType.Delete
                e.Visible = DeleteButtonVisibleCriteria(DirectCast(sender, ASPxCardView), e.VisibleIndex)
        End Select
    End Sub
    Private Function EditButtonVisibleCriteria(ByVal grid As ASPxCardView, ByVal visibleIndex As Integer) As Boolean
        Dim card As Object = grid.GetDataRow(visibleIndex)
        Return DirectCast(card, DataRow)("ProductName").ToString().Contains("a")
    End Function
    Private Function DeleteButtonVisibleCriteria(ByVal grid As ASPxCardView, ByVal visibleIndex As Integer) As Boolean
        Dim card As Object = grid.GetDataRow(visibleIndex)
        Return DirectCast(card, DataRow)("ProductName").ToString().Contains("b")
    End Function
    Protected Sub ASPxCardView1_CustomButtonInitialize(ByVal sender As Object, ByVal e As ASPxCardViewCustomCommandButtonEventArgs)
        If e.VisibleIndex = -1 Then
            Return
        End If

        If e.ButtonID = "CustomBtn" AndAlso e.VisibleIndex Mod 2 <> 0 Then
            e.Visible = DefaultBoolean.False
        End If
    End Sub
End Class