CODEWITHSUNDEEP
vb.net
K3JAE
K3JAE

Reputation: 11

Implementing a Text change event from an Array

I am looking to change textbox fore and back colors of multiple textboxes based on a value if any one of the textboxes change it's value either by user input or reading from the DB.

I am not sure how to implement the code once an individual textbox has a change. The below code is as far as I got as I do not know how to implement it to work. Can someone assist?

Private Sub DiffCalcColor_TextChanged(sender As Object, e As EventArgs) Handles tbPMDiffCalc.TextChanged, tbLHDiffCalc.TextChanged, tbRFDiffCalc.TextChanged, tbFSDiffCalc.TextChanged, tbFSADiffCalc.TextChanged

        Dim tb = DirectCast(sender, TextBox)

        Dim text = tb.Text.Replace("$", "")

        Dim number As Decimal

        Decimal.TryParse(text, number)

        Select Case number
            Case < 0D : tb.ForeColor = Color.DarkRed
                tb.BackColor = Color.White
            Case > 0D : tb.ForeColor = Color.Green
                tb.BackColor = Color.White
            Case = 0D : tb.ForeColor = Color.DimGray
                tb.BackColor = Color.Gainsboro
            Case Else
                Exit Select
        End Select
    End Sub

Upvotes: 0

Views: 198

Answers (1)

jmcilhinney
jmcilhinney

Reputation: 54427

If you want to handle the same event for multiple controls with a single method then you simply include all those controls in the Handles clause, e.g.

Private Sub TextBoxes_TextChanged(sender As Object, e As EventArgs) Handles TextBox1.TextChanged,
                                                                            TextBox2.TextChanged
    Dim eventRaiser = DirectCast(sender, TextBox)

    'Get the text that just changed.
    Dim text = eventRaiser.Text

    Dim number As Decimal

    'Try to convert it to a number.
    Decimal.TryParse(text, number)

    'Use the number to decide how to format.
    If number = Decimal.Zero Then
        '...
    Else
        '...
    End If 
End Sub

You can do that manually or you can let the designer do it for you. To do the latter, start by selecting the multiple controls in the designer, then open the Properties window, click the Events button on the toolbar, then double-click the appropriate event. That will generate an event handler, much like double-clicking on a single control does, but it will add all the selected controls to the Handles clause. It also allows you to generate a handler for any event, rather than just the default event. To add a control to that Handles clause, you can select one or more controls, select the event and then select an existing event handler from the drop-down.

Upvotes: 2

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