How to enabling a command only after text boxes are filled

[Aiman H]

hello

i want to know How to enabling a command only after text boxes are filled

in VB6

[4x2y]

Try this

Private Sub Text1_Change()
    If Text1.Text = vbNullString Then
        Command1.Enabled = False
    Else
        Command1.Enabled = True
    End If
End Sub

OR

Private Sub Text1_Change()
    Command1.Enabled = Not (Text1.Text = vbNullString)
End Sub

[MarkT]

this would work also

Private Sub Text1_Change()
    Command1.Enabled = Len(Text1.Text)
End Sub

[jggtz]

If there are several textboxes the you could iterate thru the form's controls (Controls Collection)
Declare a boolean... set it to true
Inside the loop
Ask if it is textbox (TypeOf Is Textbox) and if it's filled... set the boolean to false if empty
...
Outside of the loop
Ask for the boolean variable
If it is true then enable command button

[4x2y]

Ask if it is textbox (TypeOf Is Textbox)

This is VB6 forum

[jggtz]

TypeOf is a valid keyword in VB6

The next piece of code changes the forecolor of all Text Box controls on Form1 to red:

Dim c As Control 

For Each c In Form1.Controls
    If TypeOf c Is TextBox Then
        c.ForeColor = vbRed
    End If 
Next

You'll also find this approach useful for many other tasks, such as unchecking all of the CheckBox controls.

[Smartchap]

In form load make command button disabled. In each textbox's change event check for emptiness (Len(Text...)=0) of all text boxes, if any one is empty keep Command Button disabled.

[Hack]

Along the same lines as Smartchap, you can grab the length of a series of textboxes and multiply those lengths together. If any textbox is empty, it will equate to 0 and any number multipled by 0 becomes 0 and 0 will equate to False. Example:

Option Explicit

Private Sub EnableButton() 
Command1.Enabled = Len(Text1.Text) _
                 * Len(Text2.Text) _
                 * Len(Text3.Text) _
                 * Len(Text4.Text) _
                 * Len(Text5.Text)

End Sub

Private Sub Command2_Click()
EnableButton
End Sub

[Aiman H]

hello all

thanks for all but i want that the command button disabled at default then enabled after After writing anything on textbox

[Hack]

thanks for all but i want that the command button disabled at default then enabled after After writing anything on textbox

There are a variety of responses to your question and all of them will do what you want. Pick one.

[Aiman H]

There are a variety of responses to your question and all of them will do what you want. Pick one.

hello
yes i've tried it but the problem is that the command button shift to disabled after writing anything on textbox and clean it

i'm loocking for any way to disable the command button at default

for exemple if you open my program you will see the command button disabled at default

[Hack]

Set Enabled = False in design mode, on the button's property page.

[Aiman H]

Set Enabled = False in design mode, on the button's property page.

thanks so much
now it work but there is a small mistake
i've 3 textbox after writing anything on one textbox, the command button shift to Enabled without considering the two other textbox

this is the codethat i've used from 4x2y:

Private Sub Text1_Change()
    If Text1.Text = vbNullString Then
        calculateBtn.Enabled = False
    Else
        calculateBtn.Enabled = True
    End If
End Sub

Private Sub Text2_Change()
    If Text2.Text = vbNullString Then
        calculateBtn.Enabled = False
    Else
        calculateBtn.Enabled = True
    End If
End Sub

Private Sub Text3_Change()
    If Text3.Text = vbNullString Then
        calculateBtn.Enabled = False
    Else
        calculateBtn.Enabled = True
    End If
End Sub

[Zvoni]

Or he can do it like this:

Private Function EnableButton()  As Boolean
EnableButton = Len(Text1.Text) _
                 * Len(Text2.Text) _
                 * Len(Text3.Text) _
                 * Len(Text4.Text) _
                 * Len(Text5.Text)

End Function

'In Every Change-Event of the particular TextBoxes:
Private Sub Text1_Change()
    Command1.Enabled = EnableButton
End Sub

'The same in Form_Load-Event

Private Sub Form_Load()
    Command1.Enabled = EnableButton
End Sub

[Zvoni]

thanks so much
now it work but there is a small mistake
i've 3 textbox after writing anything on one textbox, the command button shift to Enabled without considering the two other textbox

this is the codethat i've used from 4x2y:

Private Sub Text1_Change()
    If Text1.Text = vbNullString Then
        calculateBtn.Enabled = False
    Else
        calculateBtn.Enabled = True
    End If
End Sub

Private Sub Text2_Change()
    If Text2.Text = vbNullString Then
        calculateBtn.Enabled = False
    Else
        calculateBtn.Enabled = True
    End If
End Sub

Private Sub Text3_Change()
    If Text3.Text = vbNullString Then
        calculateBtn.Enabled = False
    Else
        calculateBtn.Enabled = True
    End If
End Sub

To stay in your example:

Private Function EnableButton()  As Boolean
      EnableButton = Len(Text1.Text) * Len(Text2.Text) * Len(Text3.Text) 
End Function
 
Private Sub Text1_Change()
   Command1.Enabled = EnableButton
End Sub
 
Private Sub Text2_Change()
    Command1.Enabled = EnableButton
End Sub
 
Private Sub Text3_Change()
   Command1.Enabled = EnableButton
End Sub

[Aiman H]

To stay in your example:

Private Function EnableButton()  As Boolean
      EnableButton = Len(Text1.Text) * Len(Text2.Text) * Len(Text3.Text) 
End Function
 
Private Sub Text1_Change()
   Command1.Enabled = EnableButton
End Sub
 
Private Sub Text2_Change()
    Command1.Enabled = EnableButton
End Sub
 
Private Sub Text3_Change()
   Command1.Enabled = EnableButton
End Sub

thanks but the problem is after set these code and run my program
when it write anything on testbox i get an error with 3 button " end - debug - help"

[4x2y]

What is the error message?

[Aiman H]

What is the error message?

Now The Code Work Fine
Thanks For All