Sharepoint - Capture save event of NewForm.aspx/Edit.aspx

I like to custom 开发者_开发百科edit the permission of users after creating or editing an item.

1. Using workflow for that was not accepted by client because sometime workflow is late to start.
2. I found a Javascript approach of:

   function PreSaveItem(){...}

   But this not what I am looking for due to security, and I still dont think you can change permission of user in javascript (I hope not).

I just want to edit NewForm.aspx and add C# code that will be executed immediately before or just after item is added/edited.

Thanks

You will have to wait until the item has been created, and then BreakRoleInheritance() on it.

public class MyListHandler : Microsoft.SharePoint.SPItemEventReceiver
{
 public override void ItemAdded(SPItemEventProperties properties)
    {
        base.ItemAdded(properties);

        properties.ListItem.BreakRoleInheritance(false);
        //you will have to add the required permissions here
      }
  }

However, be aware that you will have some problems, if a user adds the item and then immediately tries to open the "DispForm.aspx". This is because the event receiver works on a parallel thread and, if the BreakRoleInheritance is performed at that moment, the user may not have read access to the item. Hence, the "Access denied" error may appear.

EDIT: When you want to deploy your event handler, you typically create a feature that can be activated/deactivated at the web scope. You then catch the "feature activated" and call a function like this:

Public Sub AddEventHandlerToList( _
          ByVal opList As SPList, _
          ByVal spAssemblyName As String, _
          ByVal spClassName As String, _
          ByVal ipType As SPEventReceiverType)
    opList.EventReceivers.Add(ipType, spAssemblyName, spClassName)
    opList.Update()
End Sub

The feature can be defined as:

<?xml version="1.0" encoding="utf-8"?>
 <Feature  Id="{ABABABE1-1234-5678-9012-345678912345}"
      Title="MySuperFeature
      Description="Something more descriptive here"
      Scope="Web"
      DefaultResourceFile="core"
      ReceiverAssembly="your.assembly.name, Version=1.0.0.0, Culture=neutral, PublicKeyToken=546479a7bab11231"
      ReceiverClass="your.namespace.MyListHandler"   
      xmlns="http://schemas.microsoft.com/sharepoint/">       
</Feature>

EDIT2: if you really have to do it in the newform.aspx, you have to add some control that is rendered in the page. Inside that control, you set an 'OnSaveHandler"

 SPContext.Current.FormContext.OnSaveHandler = AddressOf onSave

Then, implement your own save function:

Public Sub onSave(ByVal sender As Object, ByVal e As EventArgs)
    Dim sRedirectUrl As String
    Dim operation As SPLongOperation = Nothing
        operation = New SPLongOperation(Me.Page)
        operation.Begin()

        If SaveButton.SaveItem(SPContext.Current, False, "") Then
            sRedirectUrl = SPUrlUtility.CombineUrl(SPContext.Current.Site.Url, SPContext.Current.List.Forms.Item(PAGETYPE.PAGE_DISPLAYFORM).Url)
            sRedirectUrl &= "?ID=" & SPContext.Current.Item.ID
        End If

        SPContext.Current.Item.BreakRoleInheritance(false);

        operation.End(sRedirectUrl)
End Sub

Why not create an SPItemEventReceiver and bind that to the list / content type?