setting minimum character number for combo box search

[GreenJaguar]

I am working on a people picker using a combobox to search the office 365 users 

Here is my items function

Office365Users.SearchUser({searchTerm:PeoplePicker.SearchText,top:9})

I would like for the drop down to begin population once the user types more than 2 characters.  i.e., be blank when sm is typed and then begin to populate when smi is typed.

How can this be controlled?

Thx

[zmorek]

Edit for formatting because it didn't save correctly...

Update your Items property to:

If(
    Len(Self.SearchText) < 3,
    Blank(),
    Office365Users.SearchUser(
        {
            searchTerm: PeoplePicker.SearchText,
            top: 9
        }
    )
)

[GreenJaguar · Accepted solution]

Thank you @zmorek 

That works.  I also came up with this way

If(
     Len(
              PeoplePicker.SearchText)>2,
      Office365Users.SearchUser({searchTerm:PeoplePicker.SearchText,top:9}

   )

)