How to go previous control by press left or up arrow in vb.net....

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1.00/5 (1 vote)

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hello
sir please help me how to go previous control by press left or up arrow in vb.net
when i used this code :(up arrow)

VB

If e.KeyCode = Keys.Up Then
    Me.SelectNextControl(sender, False, True, True, True)
End If

the problem is --i don't change the listed item using up arrow in a combo box. when i press up arrow the focus go to on the previous control.

when i used this code :(left arrow)

VB

If e.KeyCode = Keys.Left Then
    Me.SelectNextControl(sender, False, True, True, True)
End If

the problem is --i don't move the cursor using left arrow in a text box. when i press left arrow the focus go to on the previous control.

please help me...

What I have tried:

VB

If e.KeyCode = Keys.Left Then
    Me.SelectNextControl(sender, False, True, True, True)
End If

Posted 28-Apr-18 22:33pm

Jayanta Modak

Updated 27-Jul-22 0:38am

Wendelius

v3

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Comments

Richard MacCutchan 29-Apr-18 4:40am

The code is doing what you have written. You need to change it to allow the normal behaviour inside list or grid types.

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Wendelius · Answer 1 · 2018-04-28T22:42:00

If I understand your question correctly, you want to prevent the selected item in the combobox from changing.

If this is correct, then set the Handled property to true in your code. Consider the following example:

VB

Private Sub ComboBox1_KeyDown(sender As Object, e As KeyEventArgs) Handles ComboBox1.KeyDown
    If e.KeyCode = Keys.Down Then
        Me.SelectNextControl(CType(sender, Control), False, True, True, True)
        e.Handled = True
    End If
End Sub

And the same goes with textbox

VB

Private Sub TextBox1_KeyDown(sender As Object, e As KeyEventArgs) Handles TextBox1.KeyDown
    If e.KeyCode = Keys.Left Then
        Me.SelectNextControl(CType(sender, Control), False, True, True, True)
        e.Handled = True
    End If
End Sub

Addition
----------
Wire events in code

For example in Form_Loaded event, wire all the events as follows

VB

Private Sub Form1_Load(sender As Object, e As EventArgs) Handles MyBase.Load
    For Each mycontrol As Control In Me.Controls
        If TypeOf mycontrol Is TextBox Or TypeOf mycontrol Is ComboBox Then
            AddHandler mycontrol.KeyUp, AddressOf GeneralKeyUpHandler
        End If
    Next
End Sub

and the event handler could look like

VB

Private Sub GeneralKeyUpHandler(sender As Object, e As KeyEventArgs)
    If e.KeyCode = Keys.Left Then
        Me.SelectNextControl(CType(sender, Control), False, True, True, True)
        e.Handled = True
    End If
End Sub