how to detect: input nothing

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I want to use IF-THEN rules to detect users entering nothing in these forms text box by showing a message box.

but how?... I know how to do a message box, but in oder to run the message box, my program has to detect that the user hasn't entered anything?

please help........... thank you

VB Code:

Private Sub Continue_Click()
    If IsNumeric(Answer.Text) = True Then 'check for correct data type'
        MsgBox "You've answered in the wrong data type, please enter in alphabet letters", 1 + 48, "Error" 'message box shown if the user enters their answer in numbers'
    Else
        If (Answer.Text = "water") Then 'If correct answer then'
            Users_score = Users_score + 1 'add one to the score'
        End If
        Unload Q1 'closes Question 1 form'
        Ans_1.Show 'loads Answer and comment form for question 1'
    End If
End Sub
'This code runs when the user has entered their answer in the box provided in the form and clicked OK, it checks if the answer is numbers or not, if so then it will show a message box to the user and if not, then continue the program,, if the answer is correct then add one to the score then closes the question page and load the answer and comment page.'

VB Code:

Private Sub Continue_Click()
    If IsNumeric(Answer.Text) = True Then 'check for correct data type'
        MsgBox "You've answered in the wrong data type, please enter in alphabet letters", 1 + 48, "Error" 'message box shown if the user enters their answer in numbers'
    Else
        If Not (LCase(Answer.Text) = LCase("East Germany") Or LCase(Answer.Text) = LCase("West Germany") Or LCase(Answer.Text) = LCase("no man's land")) Then 'if the answer is not East Germany, West Germany or no man's land, then add one to the score.'
            Users_score = Users_score + 1
        End If
        Unload Q4 'closes Question 4 form'
        Ans_4.Show 'loads Answer and comment form for question 4'
    End If
End Sub
'This code runs when the user has entered their answer in the box provided in the form and clicked OK, it checks if the answer is numbers or not, if so then it will show a message box to the user and if not, then continue the program, close the question page and load the answer and comment page, also if the answer is not East Germany, West Germany or no man's land, then it will add one to the score.'

VB Code:

Private Sub Continue_Click()
    If IsNumeric(Answer.Text) = True Then 'check for correct data type'
        MsgBox "You've answered in the wrong data type, please enter in alphabet letters", 1 + 48, "Error" 'message box shown if the user enters their answer in numbers'
    Else
        Users_score = Users_score + 1 'add one to the score'
        Unload Q6 'closes Question 1 form'
        Finish_page.Show 'loads Answer and comment form for question 1'
    End If
End Sub
'This code runs when the user has entered their answer in the box provided in the form and clicked OK, it checks if the answer is numbers or not, if so then it will show a message box to the user and if not, then continue the program, and add one to the score, closes the question page and load the answer and comment page.'

Jul 29th, 2003, 02:51 AM
jewel

hi :)

try:

Private Sub Continue_Click()
if Answer.Text = "" then
msgbox "Please type your answer here"
Answer.Setfocus
exit sub
end if
end sub

If you have to test for an empty string in many text boxes, you might consider using a function. A nice one I picked up from this forum (cannot remember who wrote it) is:
VB Code:
copy into a bas module:
 
Public Function IsTextEmpty(ByVal strText As String) As Boolean
IsTextEmpty = CBool(Len(Trim$(strText)) = 0)
End Function
 
To use in a form:
 
If IsTextEmpty(Textbox1.Text) then
Msgbox "No data entered"
End if
Cheers

Jack

Jul 30th, 2003, 01:27 AM
Blitzen

could there be a more simple way?

btw, thx jewel but it didn't work...

Okay I did what Jewel said but it didin't work...

VB Code:

Private Sub Continue_Click()
    If IsNumeric(Answer.Text) = True Then 'check for correct data type'
        MsgBox "You've answered in the wrong data type, please enter in alphabet letters", 1 + 48, "Error" 'message box shown if the user enters their answer in numbers'
    Else
        If Answer.Text = "" Then 
            MsgBox "You havn't answered yet!", 1 + 48, "Come on..."
        Else
            If (Answer.Text = "bread") Then 'If correct answer then'
                Users_score = Users_score + 1 'add one to the score'
            End If
        End If
    End If
        Unload Q2 'closes Question 1 form'
        Ans_2.Show 'loads Answer and comment form for question 1'
End Sub

Quote:

Okay I did what Jewel said but it didin't work...

VB Code:

Private Sub Continue_Click()
If IsNumeric(Answer.Text) = True Then 'check for correct data type'
MsgBox "You've answered in the wrong data type, please enter in alphabet letters", 1 + 48, "Error" 'message box shown if the user enters their answer in numbers'
Else
If Answer.Text = "" Then
MsgBox "You havn't answered yet!", 1 + 48, "Come on..."
Else
If (Answer.Text = "bread") Then 'If correct answer then'
Users_score = Users_score + 1 'add one to the score'
End If
End If
End If
Unload Q2 'closes Question 1 form'
Ans_2.Show 'loads Answer and comment form for question 1'
End Sub

The first code I sent you works fine for me :) maybe we can revised your code to this:

VB Code:

Private Sub Continue_Click()
    
'------------------------------ 
'    validate first input
    If Answer.Text = "" Then
        MsgBox "You havn't answered yet!", 1 + 48, "Come on..."
        Answer.SetFocus
        Exit Sub
    End If
    If IsNumeric(Answer.Text) = True Then 'check for correct data type'
        MsgBox "You've answered in the wrong data type, please enter in alphabet letters", 1 + 48, "Error" 'message box shown if the user enters their answer in numbers'
        Answer.SetFocus
        Exit Sub
    End If
    '---------------------------------------------
    If (Answer.Text = "bread") Then 'If correct answer then'
        Users_score = Users_score + 1 'add one to the score'
    End If
    
    Unload Q2 'closes Question 1 form'
    Ans_2.Show 'loads Answer and comment form for question 1'
End Sub

or you can make a function returning true if the input is valid like Jackalx25 did

VB Code:

Private Sub Continue_Click()
   If IsValid(Answer.Text) = True Then
        If (Answer.Text = "bread") Then 'If correct answer then'
            Users_score = Users_score + 1 'add one to the score'
        End If
    Else
        MsgBox "Invalid Answer!!"
        Answer.SetFocus
    End If
    Unload Q2 'closes Question 1 form'
    Ans_2.Show 'loads Answer and comment form for question 1'
End Sub
 
Private Function IsValid(str As String) As Boolean
    IsValid = True
    If Answer.Text = "" Or IsNumeric(Answer.Text) = True Then
        IsValid = False
    End If
End Function

Jul 30th, 2003, 02:22 AM
Blitzen

wait wait wait..... my own little mistakes... it actually works... but after the message box, it skips to the other form... how can i make it not do that?... and let the user answer the question? after they have entered nothing and the message box poped up?
Jul 30th, 2003, 02:41 AM
jewel
Quote:

Originally posted by Blitzen
wait wait wait..... my own little mistakes... it actually works... but after the message box, it skips to the other form... how can i make it not do that?... and let the user answer the question? after they have entered nothing and the message box poped up?

hi :)
please make sure you put exit sub after you show your msgbox
VB Code:
```
If Answer.Text = "" then
      msgbox "Please Enter something"
      Answer.Setfocus
     [B]Exit Sub[/B] 'it will ignore all the code after this
end if
```
hope it wors:)

well other questions forms worked exept this one and the coding is

VB Code:

Private Sub Continue_Click()
    If IsNumeric(Answer.Text) = True Then 'check for correct data type'
        MsgBox "You've answered in the wrong data type, please enter in alphabet letters", 1 + 48, "Error" 'message box shown if the user enters their answer in numbers'
    Else
        If Not (LCase(Answer.Text) = LCase("East Germany") Or LCase(Answer.Text) = LCase("West Germany") Or LCase(Answer.Text) = LCase("no man's land")) Then 'if the answer is not East Germany, West Germany or no man's land, then add one to the score.'
            Users_score = Users_score + 1
        Else
            If (Answer.Text = "") Then
                MsgBox "You havn't answered yet!", 1 + 48, "Come on..."
                Answer.SetFocus
                Exit Sub 'it will ignore all the code after this'
                End If
        Unload Q4 'closes Question form'
        Ans_4.Show 'loads Answer and comment form'
        End If
    End If
End Sub

I enter nothing and the OK command button did not work, like it showed it had been pressed. it should pop up a msgBox but nothing happened... why?

Jul 30th, 2003, 03:09 AM
Blitzen

sorry... my little mistakes again........

placed the new coding in the wrong places.....

well, it worked and my program has finally completed !!!

thank-you VB Forum members for all your help ;)

well, i run your program and this is what i found out
your condition

VB Code:

If Not (LCase(Answer.Text) = LCase("East Germany") Or LCase(Answer.Text) = LCase("West Germany") Or LCase(Answer.Text) = LCase("no man's land")) Then

is true so its proceeds to

VB Code:

Users_score = Users_score + 1

and ignores your validation... to prove this try tracing you program by pressing F9 on you if condition (you make a breakpoint] and then run your program, press F8 to step into the next line :)

Quote:

Originally posted by Blitzen
well other questions forms worked exept this one and the coding is

VB Code:

Private Sub Continue_Click()
If IsNumeric(Answer.Text) = True Then 'check for correct data type'
MsgBox "You've answered in the wrong data type, please enter in alphabet letters", 1 + 48, "Error" 'message box shown if the user enters their answer in numbers'
Else
If Not (LCase(Answer.Text) = LCase("East Germany") Or LCase(Answer.Text) = LCase("West Germany") Or LCase(Answer.Text) = LCase("no man's land")) Then 'if the answer is not East Germany, West Germany or no man's land, then add one to the score.'
Users_score = Users_score + 1
Else
If (Answer.Text = "") Then
MsgBox "You havn't answered yet!", 1 + 48, "Come on..."
Answer.SetFocus
Exit Sub 'it will ignore all the code after this'
End If
Unload Q4 'closes Question form'
Ans_4.Show 'loads Answer and comment form'
End If
End If
End Sub

I enter nothing and the OK command button did not work, like it showed it had been pressed. it should pop up a msgBox but nothing happened... why?

Jul 30th, 2003, 03:21 AM
jewel

Quote:

Originally posted by Blitzen
sorry... my little mistakes again........

placed the new coding in the wrong places.....

well, it worked and my program has finally completed !!!

thank-you VB Forum members for all your help ;)

Gud!!!

okay I need some explaination...

VB Code:

Private Sub Continue_Click()
    If IsNumeric(Answer.Text) = True Then 'check for correct data type'
        MsgBox "You've answered in the wrong data type, please enter in alphabet letters", 1 + 48, "Error" 'message box shown if the user enters their answer in numbers'
    Else
        If (Answer.Text = "water") Then 'If correct answer then'
            Users_score = Users_score + 1 'add one to the score'
        Else
            If (Answer.Text = "") Then
                MsgBox "You havn't answered yet!", 1 + 48, "Come on..."
                Answer.SetFocus
                Exit Sub 'it will ignore all the code after this'
                End If
        End If
    End If
    Unload Q1 'closes Question form'
    Ans_1.Show 'loads Answer and comment form'
End Sub

well I don't get why you guys suggested to me to put Answer.SetFocus and Exit Sub on the following lines after the last message box?

the funny thing is if I don't put them in, after I click OK in the message box that tells me that I have not entered anything, the program will go straight to Ans_1 form... why?

thank you ;)