Listview: How to make the Insert Button invisible through code behind

hans · May 17th, 2009, 10:37 AM

Hi,

I have a Listview, where some users (depending on their role) are allowed to edit, delete and insert columns and others are only allowed to read the data.
Hence I have set the Insert, Delete and Edit buttons as invisible by default. In the code behind I tried to make the buttons visible for the user with the right role. This works fine for the Edit button and the Delete button, where I use the GridView_RowDataBound code from Chapter 14 page 495, with some adaptation because my ListView shows the columns in a single line.
For the Insert button however I can't find an Event that targets the Insert button. I tried ItemCommand, ItemCreated, ItemDataBound, DataBinding, Load for the ListView and pageLoad as well. Is there a way to target the Insert button?
Even more attractive would be to make the whole Insert template visible/invisible by a single command, but I guess that's impossible.

My code is

Code:

<asp:LinkButton ID="InsertButton" runat="server" CommandName="Insert" 
        Text="Insert" ValidationGroup="Insert" Visible="False" />

//Code behind

protected void ListViewSchalen_ItemDataBound(object sender, ListViewItemEventArgs e)
  {
    if (Roles.IsUserInRole("Neurologie"))
    {
      switch (e.Item.ItemType)
      {
        case ListViewItemType.DataItem:
          LinkButton myDeletebtn = (LinkButton)e.Item.FindControl("DeleteButton");
          if (myDeletebtn != null)
          {
            myDeletebtn.Visible = true;
          }
          LinkButton myEditbtn = (LinkButton)e.Item.FindControl("EditButton");
          if (myEditbtn != null)
          {
            myEditbtn.Visible = true;
          }
          LinkButton myInsertbtn = (LinkButton)e.Item.FindControl("InsertButton");
          if (myInsertbtn != null)
          {
            myInsertbtn.Visible = true;
          }
          LinkButton myCancelbtn = (LinkButton)e.Item.FindControl("CancelButton");
          if (myCancelbtn != null)
          {
            myCancelbtn.Visible = true;
          }
          break;
      }
    }
  }

thanks

Hans

Lee Dumond · May 17th, 2009, 12:23 PM

I'm not sure what book you're following, but the usual approach to something like this would be to place all of your editing/deleting/inserting controls in a single enclosing control such as a Panel, then just make the Panel visible if the user is in the correct role.

hans · May 17th, 2009, 03:42 PM

Thanks Lee,

The book is "Beginning ASP.Net 3.5 in C# and VB".
Using a Panel will make things a lot easier. That would allow me to make the whole <InsertItemTemplate> visible/invisible.
But which Event do I need to use when I make the Panel visible?

Best regards,

Hans

Imar · May 24th, 2009, 12:41 PM

Hi Hans,

While the Panel approach works great for hiding many controls at the same time, the ListView makes this even easier by supplying a None value for the InsertItemPosition. When set to none, the entire InsertItem is hidden:

Code:

 
 
if (!User.IsInRole("SomeRole"))
{
  ListView1.InsertItemPosition = InsertItemPosition.None;
}

Hope this helps,

Imar

fawel · July 18th, 2016, 03:04 AM

Imar's code is great! I did it following his code.