Accessing Client Changes on the Server

Client side changes are available on the server side after postback. You can use the ClientChanges property of RadPanelBar to access them. The ClientChanges property of RadPanelbar returns a collection of objects of type ClientOperation.An operation has two properties:

• Item - the item which has been affected by the client operation;

• Type - the type of the operation which is one of the following four cases:

  • Update - when a property is set on the the client through methods such as set_text(), set_value(), enable(), disable(), etc.: panelbarItem.disable();

  • Remove - when the remove client method is called: panelbar.get_items().remove(panelbarItem);

  • Insert - when the add client method is called: panelbar.get_items().add(panelbarItem);

  • Clear - when an item with child items calls the clear() method: parentItem.get_items().clear(). If the parent item has no child items the ClientChanges collection is not altered.

Note that you need to call the trackChanges () and commitChanges () client methods of RadPanelBar in order to be able to access the changes on the server via the ClientChanges property.

Example:

The code snippet below enumerates through all operations in the ClientChanges collection and utilizes both the Item and Type properties. For a complete demo, please see the client-side Add/Remove/Disable Items example.

foreach (ClientOperation<RadPanelItem> operation in RadPanelBar1.ClientChanges)
{
    RadPanelItem item = operation.Item;

    switch (operation.Type)
    {
        case ClientOperationType.Insert:
         break;
        case ClientOperationType.Remove:
         break;
        case ClientOperationType.Update:
         UpdateClientOperation<RadPanelItem> update = operation as UpdateClientOperation<RadPanelItem>;
         break;
        case ClientOperationType.Clear:
         break;
    } 
}

For Each operation As ClientOperation(Of RadPanelItem) In RadPanelBar1.ClientChanges
Dim item As RadPanelItem = operation.Item

 Select Case operation.Type
  Case ClientOperationType.Insert
   Exit Select
  Case ClientOperationType.Remove
   Exit Select
  Case ClientOperationType.Update
Dim update As UpdateClientOperation(Of RadPanelItem) = TryCast(operation, UpdateClientOperation(Of RadPanelItem))
   Exit Select
  Case ClientOperationType.Clear
   Exit Select
 End Select
Next

See Also

• RadPanelBar Object