If textboxes are empty, how do I disable a button?

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If textboxes are empty, how do I disable a button?

Tim 60

I have a button connected to textboxes. How do I disable the button if textboxes are empty? I've tried a few things, cannot seem to get it to function. Thanks.

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Answer 1

Viorel 127K

For instance, handle the TextChanged event of textboxes. (The handlers can be added by double-clicking the textboxes). Also handle the Load event of the form.

    Private Sub Form1_Load(sender As Object, e As EventArgs) Handles MyBase.Load
        UpdateButton()
    End Sub

    Private Sub TextBox1_TextChanged(sender As Object, e As EventArgs) Handles TextBox1.TextChanged
        UpdateButton()
    End Sub

    Private Sub TextBox2_TextChanged(sender As Object, e As EventArgs) Handles TextBox2.TextChanged
        UpdateButton()
    End Sub

    Sub UpdateButton()
        Button1.Enabled = Not String.IsNullOrWhiteSpace(TextBox1.Text) AndAlso Not String.IsNullOrWhiteSpace(TextBox2.Text)
    End Sub

It is possible to use a unique TextChanged handler for textboxes.

Tim 60 Reputation points

2024-01-15T18:52:57.0866667+00:00

Is it possible to make it simpler using an If/Then statement?
If there is nothing in the textbox, then the button is disabled.

Viorel 127K

Using If:

Sub UpdateButton()
    If String.IsNullOrWhiteSpace(TextBox1.Text) OrElse String.IsNullOrWhiteSpace(TextBox2.Text) Then
        Button1.Enabled = False
    Else
        Button1.Enabled = True
    End If
End Sub

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If textboxes are empty, how do I disable a button?

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