一、文本框限定
1、限定輸入的字符長度
文本框中有個MaxLength屬性,輸入自己要限定的數字即可;也可以利用代碼來限定,當超過限定長度時,彈出警告對話窗
Private sub txtUserName_change()
If Len(Trim(txtUserName)) > 4 then
MsgBox "姓名不能超過4個字符,請重新輸入!", 0 + 48
txtUserName = ""
End if
End iSub
Trim函數是消除字符串的空格,Len函數是計算字符串的長度
2、限定特殊字符
Private Sub txtUserName_Change()
If Len(Trim(txtUserName)) > 4 then
MsgBox "姓名不能超過4個字符,請重新輸入!", 0 + 48
txtUserName = ""
End if
End sub
3、限定輸入的字符類型
Private Sub txtSID_KeyPress(KeyAscii As Integer)
Const xStr As String = "123456" '只能輸入數字
KeyAscii = IIf(Instr(xStr & Chr(8), Chr(KeyAscii)), KeyAscii, 0)
End Sub
4、限定特殊字符
Private Sub txtDirector_KeyPress(KeyAscii As Integer)
Select Case KeyAscii
Case 8 '限制退格鍵
Case Asc("A") To ("Z")
Case Asc("a") To ("z")
Case Is < 0
Case Else
KeyAscii = 0
MsgBox "格式錯誤,請輸入漢字或英文!", 0 + 48
txtDirector.Text = ""
End Select
End Sub
二、下拉框限定
Combox限定不能鍵盤輸入,只能選擇下拉框裏面的內容
Private Sub comboGrade_KeyPress(KeyAscii As Integer)
KeyAscii = 0 '限制鍵盤不能輸入內容
End Sub
三、限定成績
Private Sub txtResult_Change()
If Val(txtResult.Text) > 120 Or Val(txtResult.Text) < 0 Then
MsgBox "請輸入成績在0~120範圍內!", 0 + 48
txtResult.Text = ""
End If
End Sub
四、限定不能複製粘貼
在第二次輸入密碼時,不能複製粘貼
Private Sub txtPassword1_KeyDown(KeyCide As Integer, Shift As Integer)
If (KeyCode = 86 Or KeyCode = 67 Or KeyCode = 88) And Shift = 2 Then
MsgBox "不能複製粘貼", 0 + 48
txtPassword1.Text = ""
End If
End Sub