If...Then...Else Statement

Defines one or more statement blocks that you only want to execute if a given condition or expression is True.

  If condition Then 
      statements
  [{ElseIf|Else If} expression Then
      statements]
  [Else 
      statements]
  {EndIf|End If}

Instead of Else If you can write ElseIf, instead of End If you can write EndIf.

If statements can be shortened to one line when using single statement blocks.

  If condition Then statement [Else statement]

The If...Then statement executes program blocks depending on given conditions. When LibreOffice Basic encounters an If statement, the condition is tested. If the condition is True, all subsequent statements up to the next Else or ElseIf statement are executed. If the condition is False, and an ElseIf statement follows, LibreOffice Basic tests the next expression and executes the following statements if the condition is True. If False, the program continues either with the next ElseIf or Else statement. Statements following Else are executed only if none of the previously tested conditions were True. After all conditions are evaluated, and the corresponding statements executed, the program continues with the statement following EndIf.

Sie können mehrere Anweisung If...Then verschachteln.

Else und ElseIf-Statements brauchen nicht mit angegeben zu werden, sind also optional.

Ihr Programm darf zwar mit Hilfe von GoTo und GoSub aus einer Konstruktion If...Then herausspringen, jedoch nicht in eine Struktur If...Then hineinspringen.

Das folgende Beispiel lässt Sie das Verfallsdatum eines Produkts eingeben und bestimmt dann, ob es abgelaufen ist.

Sub ExampleIfThenDate
    Dim sDate As String
    Dim sToday As String
    sDate = InputBox("Bitte geben Sie das Verfallsdatum ein (TT.MM.JJJJ)")
    sDate = Right$(sDate, 4) + Mid$(sDate, 4, 2) + Left$(sDate, 2)
    sToday = Date$
    sToday = Right$(sToday, 4)+ Mid$(sToday, 4, 2) + Left$(sToday, 2)
    If sDate < sToday Then
        MsgBox "Das Verfalldatum ist abgelaufen"
    ElseIf sDate > sToday Then
        MsgBox "Das Verfalldatum ist noch nicht abgelaufen"
    Else
        MsgBox "Das Verfalldatum läuft heute ab"
    End If
End Sub