ItemDataBind, événement (List)

Se produit lorsqu'un élément d'un contrôle List est lié à des données.

public event ListDataBindEventHandler ItemDataBind

Notes

Lorsqu'un élément d'un contrôle List est créé et qu'il est lié à des données, le gestionnaire d'événements définit les propriétés de l'élément de liste à partir d'expressions arbitraires.

Un élément d'un contrôle List est de type MobileListItem.

L'événement est déclenché lorsque chaque élément de source de données est lié. Le moment est alors approprié pour filtrer ou grouper les éléments de la collection MobileListitemCollection, en utilisant Text ou Value.

Exemple

L'exemple suivant montre comment utiliser l'événement ItemDataBind. La propriété DataValueField spécifie l'action effectuée.

<Script language="vb" runat="server">

 ' Persist across multiple postbacks.
Shared i, j, k As Integer

Class Task
   Private _TaskName As String
   Private _Status As [String]
   
   
   Public Sub New(TaskName As [String], Status As [String])
      _TaskName = TaskName
      _Status = Status
   End Sub 
   
   
   Public ReadOnly Property TaskName() As [String]
      Get
         Return _TaskName
      End Get
   End Property
   
   Public ReadOnly Property Status() As [String]
      Get
         Return _Status
      End Get
   End Property 
End Class

Private Sub Page_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
If Not IsPostBack Then
   ' Initialize static variables to zero.
   i = 0
   j = 0
   k = 0

   ' Initial settings for tasks.
   List1.DataValueField = "Status"
   List1.DataTextField = "TaskName"
   
   ' Create an array and add the tasks to it.
   Dim arr As New ArrayList()
   arr.Add(New Task("Verify transactions", "Done"))
   arr.Add(New Task("Check balance sheet", "Scheduled"))
   arr.Add(New Task("Send report", "Pending"))
   
   ' Associate and bind the List to the array.
   List1.DataSource = arr
   List1.DataBind()
   
End If

End Sub


Sub TaskSummary(sender As [Object], e As ListDataBindEventArgs)
   Select Case e.ListItem.Value
      Case "Done"
         i += 1
      Case "Scheduled"
         j += 1
      Case "Pending"
         k += 1 
         
   End Select
   
   Label2.Text = "You have " + i.ToString() + " tasks done, " + j.ToString() + " tasks scheduled, and " + k.ToString() + " tasks Pending."
End Sub


Sub TaskStatus(sender As [Object], e As ListCommandEventArgs)

   Label3.Text = e.ListItem.Text + " is " + e.ListItem.Value

End Sub

 <mobile:Form runat=server id="frm1" >
   <mobile:Label runat="server" id="Label1" ForeColor=green 
                 Font-Italic=true />
   <mobile:List runat=server id="List1" OnItemDataBind="TaskSummary" 
                OnItemCommand = "TaskStatus"/>
   <mobile:Label runat="server" id="Label2" Font-Italic=true 
                 ForeColor=Red />
   <mobile:Label runat="server" id="Label3" Font-Italic=true 
                 ForeColor=Red />
</mobile:Form>
   

[C#]
<%@ Page Inherits="System.Web.UI.MobileControls.MobilePage" 
   Language="c#" Debug="true" %>

<script runat=server>

// Persist across multiple postbacks.
static int i,j,k;

class Task
{
   private String _TaskName;
   private String _Status;

   public Task(String TaskName, String Status) 
   { 
      _TaskName = TaskName; 
      _Status = Status;
   }

   public String TaskName { get { return _TaskName; } }
   public String Status { get { return _Status; } }
}

public void Page_Load(Object sender, EventArgs e)
{
   if (!IsPostBack)
   {
      // Initialize static variables to zero.
      i = j = k = 0;

      // Initial settings for tasks.
      List1.DataValueField="Status";
      List1.DataTextField="TaskName";

      // Create an array and add the tasks to it.
      ArrayList arr = new ArrayList();
      arr.Add (new Task ("Verify transactions", "Done"));
      arr.Add (new Task ("Check balance sheet", "Scheduled"));
      arr.Add (new Task ("Send report", "Pending"));

      // Associate and bind the List to the array.
      List1.DataSource = arr;
      List1.DataBind ();

      if (List1.HasItemCommandHandler)
      {
         Label1.Text = "List has ItemCommand event handler";
      }
      else
      {
         Label1.Text = "List does not have ItemCommand event handler";
      }
   }
}

void TaskSummary(Object sender, ListDataBindEventArgs e)
{ 
   switch (e.ListItem.Value)
   {
      case "Done":
         i++;
         break;
      case "Scheduled":
         j++;
         break;
      case "Pending":
         k++;
         break;
      Default:
         break;
   }

   Label2.Text = "You have " + i + " tasks done, " 
                             + j + " tasks scheduled, and " 
                             + k + " tasks Pending.";
}

void TaskStatus(Object sender, ListCommandEventArgs e)
{
   Label3.Text = e.ListItem.Text +" is " + e.ListItem.Value;
}


</script>

<mobile:Form runat=server id="frm1" >
   <mobile:Label runat="server" id="Label1" ForeColor=green 
                 Font-Italic=true />
   <mobile:List runat=server id="List1" OnItemDataBind="TaskSummary" 
                OnItemCommand = "TaskStatus"/>
   <mobile:Label runat="server" id="Label2" Font-Italic=true 
                 ForeColor=Red />
   <mobile:Label runat="server" id="Label3" Font-Italic=true 
                 ForeColor=Red />
</mobile:Form>

Voir aussi

ListDataBindEventArgs, classe (SelectionList) | ObjectList, classe | ObjectListDataBindEventArgs, classe | SelectionList, classe | OnItemDataBind, méthode

S'applique à : List, classe