帮我看看!

[fan8]

Public Function val(strl As String) As Boolean
val = IIf(IsNull(str1), True, False)

End Function
我想通过该function来判断text里的输入是否为空,为什么不起作用.

[Tyro]

写成Public Function val(strl As Variant) As Boolean就可以了

[liuliushuang]

Public Function val(strl As String) As Boolean
val = IIf(Len(Trim(str1))=0, True, False)
End Function

[xiaoy2000]

条件改为
IIf(str1 = "", True, False)
如此即可,as boolean去掉也行,只需看一下null具体含义即可

[DimVar]

Public Function val(strl As String) As Boolean
val = IIf(str1="", True, False)
End Function
isNull不能判断字符串是否为空