Columna de casilla de verificación de GridView

Question

Solía ??tener una clase en 1.1 para el Datagrid que heredó de la clase DataGridColumn. Esto me permitió crear una columna de casilla de verificación con una casilla un / check-all del lado del cliente en el encabezado. Luego, cuando diseñé mi cuadrícula, simplemente agregaría mi columna personalizada.

Actualmente estoy en un proyecto donde necesito una funcionalidad similar para la vista de cuadrícula, sin embargo, no parece haber una forma de heredar o agregar funcionalidad a una columna.

Así que mi pregunta es: ¿hay alguna forma de anular una columna? o ¿Ya existe este código, de forma reutilizable?

Las necesidades son simples: me gustaría que solo registrara el JavaScript en la página y mostrara una columna de casillas de verificación.

Ya he encontrado la muestra de 4guys, pero solo han puesto todo el código en el código que hay detrás, estoy buscando algo menos copiar / pegar.

Answer 1

Heredé BoundField y se me ocurrió esto:

Código de página:

<%@ register tagprefix="CAC" namespace="UI.Controls" assembly="UI.Controls" %>    
<asp:gridview id="grdPrint" runat="server" autogeneratecolumns="False">
    <columns>
        <cac:checkallcolumn />
        <asp:boundfield datafield="CompanyName" headertext="Company Name" />
    </columns>
</asp:gridview>

Y este es el control:

Imports system.Web.UI
Imports system.Web.UI.WebControls

Public Class CheckAllColumn
    Inherits BoundField

    Public Sub New()
        MyBase.New()
    End Sub

    Public ReadOnly Property SelectedIndexes() As List(Of Int32)
        Get
            Dim selectedIndexList As New List(Of Int32)
            Dim grdParent As GridView = CType(Me.Control, GridView)
            For Each item As GridViewRow In grdParent.Rows
                Dim chkBox As CheckBox = CType(item.FindControl("checkboxCol"), CheckBox)
                If ((Not (chkBox) Is Nothing) _
                            AndAlso chkBox.Checked) Then
                    selectedIndexList.Add(item.DataItemIndex)
                End If
            Next
            Return selectedIndexList
        End Get
    End Property

    Public ReadOnly Property SelectedDataKeys() As Object()
        Get
            Dim dataKeyList As ArrayList = New ArrayList
            Dim grdParent As GridView = CType(Me.Control, GridView)
            If (grdParent.DataKeys.Count > 0) Then
                For Each selectedIndex As Int32 In SelectedIndexes
                    Dim DataKey As Object = grdParent.DataKeys(selectedIndex).ToString
                    dataKeyList.Add(DataKey)
                Next
            End If
            Return CType(dataKeyList.ToArray(GetType(System.Object)), Object())
        End Get
    End Property

    Public Overrides Sub InitializeCell(ByVal cell As DataControlFieldCell, ByVal cellType As DataControlCellType, ByVal rowState As DataControlRowState, ByVal rowIndex As Integer)
        If cell Is Nothing Then
            Throw New ArgumentNullException("cell", "cell is null.")
        End If
        MyBase.InitializeCell(cell, cellType, rowState, rowIndex)
        If (cellType = DataControlCellType.Header) OrElse (cellType = DataControlCellType.DataCell) Then
            Dim checkbox As CheckBox = New CheckBox
            If cellType = DataControlCellType.Header Then
                checkbox.ID = "checkboxHead"
            Else
                checkbox.ID = "checkboxCol"
            End If
            cell.Controls.Add(checkbox)
        End If
    End Sub

    Public Shared Sub RegisterClientCheckEvents(ByVal pg As Page, ByVal formID As String)
        If pg Is Nothing Then
            Throw New ArgumentNullException("pg", "pg is null.")
        End If
        If formID Is Nothing OrElse formID.Length = 0 Then
            Throw New ArgumentException("formID is null or empty.", "formID")
        End If
        Dim strCol As String = GetCheckColScript()
        Dim strHead As String = GetCheckHeadScript()
        If Not pg.ClientScript.IsClientScriptBlockRegistered("clientScriptCheckAll") Then
            pg.ClientScript.RegisterClientScriptBlock(pg.GetType, "clientScriptCheckAll", strHead.Replace("[frmID]", formID))
        End If
        If Not pg.ClientScript.IsClientScriptBlockRegistered("clientScriptCheckChanged") Then
            pg.ClientScript.RegisterClientScriptBlock(pg.GetType, "clientScriptCheckChanged", strCol.Replace("[frmID]", formID))
        End If
        RegisterAttributes(pg)
    End Sub

    Private Shared Sub RegisterAttributes(ByVal ctrl As Control)
        For Each wc As Control In ctrl.Controls
            If wc.HasControls Then
                RegisterAttributes(wc)
            End If
            If TypeOf (wc) Is CheckBox Then
                Dim chk As CheckBox = DirectCast(wc, CheckBox)
                If Not chk Is Nothing AndAlso chk.ID = "checkboxCol" Then
                    chk.Attributes.Add("onclick", "CheckChanged()")
                ElseIf Not chk Is Nothing AndAlso chk.ID = "checkboxHead" Then
                    chk.Attributes.Add("onclick", "CheckAll(this)")
                End If
            End If
        Next
    End Sub

    Private Shared Function GetCheckColScript() As String
        Dim strScript As String
        strScript = " <script language=JavaScript>"
        strScript &= " function CheckAll( checkAllBox )"
        strScript &= " {"
        strScript &= " var frm = document.[frmID];"
        strScript &= "  var ChkState=checkAllBox.checked;"
        strScript &= "  for(i=0;i< frm.length;i++)"
        strScript &= "  {"
        strScript &= "         e=frm.elements[i];"
        strScript &= "        if(e.type=='checkbox' && e.name.indexOf('checkboxCol') != -1)"
        strScript &= "            e.checked= ChkState ;"
        strScript &= "  }"
        strScript &= " }"
        strScript &= "  </script>"
        Return strScript
    End Function

    Private Shared Function GetCheckHeadScript() As String
        Dim strScript As String
        strScript = "<script language=JavaScript>"
        strScript &= "function CheckChanged()"
        strScript &= "{"
        strScript &= "  var frm = document.[frmID];"
        strScript &= "  var boolAllChecked;"
        strScript &= "  boolAllChecked=true;"
        strScript &= "  for(i=0;i< frm.length;i++)"
        strScript &= "  {"
        strScript &= "    e=frm.elements[i];"
        strScript &= "  if ( e.type=='checkbox' && e.name.indexOf('checkboxCol') != -1 )"
        strScript &= "      if(e.checked== false)"
        strScript &= "      {"
        strScript &= "         boolAllChecked=false;"
        strScript &= "         break;"
        strScript &= "      }"
        strScript &= "  }"
        strScript &= "  for(i=0;i< frm.length;i++)"
        strScript &= "  {"
        strScript &= "    e=frm.elements[i];"
        strScript &= "    if ( e.type=='checkbox' && e.name.indexOf('checkboxHead') != -1 )"
        strScript &= "    {"
        strScript &= "      if( boolAllChecked==false)"
        strScript &= "         e.checked= false ;"
        strScript &= "      else"
        strScript &= "         e.checked= true;"
        strScript &= "      break;"
        strScript &= "    }"
        strScript &= "   }"
        strScript &= " }"
        strScript &= " </script>"
        Return strScript
    End Function
End Class

Answer 2

Derivé clases de System.Web.UI.WebControls.BoundField y .HyperLinkField Puede estar interesado en heredar de la clase CheckBoxField http : //msdn.microsoft.com/en-us/library/system.web.ui.webcontrols.checkboxfield.aspx

Answer 3

¿Podrías usar una TemplateColumn con una plantilla Item que contiene tu CheckBox en tus columnas de DataGrid?

Algo como:

<asp:DataGrid id="DG1" runat = "server" DataKeyField = "ID">
<Columns>
<asp:TemplateColumn HeaderText="ProductName">
<ItemTemplate>
<asp:CheckBox id="chkBox1" runat="server" 
Text =<%# DataBinder.Eval(Container.DataItem,"yourDataToBind") %>
checked='<%# DataBinder.Eval(Container.DataItem,"yourBoolToBind")  %>'>
</asp:CheckBox>
</ItemTemplate>
</asp:TemplateColumn>
</Columns>
</asp:DataGrid>