Custom server control events questions

Question

User-1439923671 posted

I need a custom server control which contains one TextBox and one RadioButtonList.  I need to define a OnValueChanged event on custom server control which can capture the TextChanged event of TextBox OR SelectedIndexChanged event of RadioButtonListj, so that I can get the Text value of TextBox OR SelectedIndex value of RadioButtonList.  Then I can use that value to continue more functions in OnValueChanged event.  Can anybody show me how to implement that?  Some examples or codes would be greatly appreciated!

Answer 1

User1037547548 posted

Can anybody show me how to implement that?  Some examples or codes would be greatly appreciated!

 

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Regard

Khan 

Answer 2

User-916962509 posted

You need to create a custom event which you can raise. You can then handle your custom event whenever it gets fired.

For example, create a custom event "SelectedValueChanged".

Then, create some handlers in your control to handle the TextChanged of the textbox and SelectedValueChanged of the RadiobuttonList. Make both of these handlers raise your custom event.

Something like this- it compiles but I have not tested it.

  

1    Public Class TestControl
2        ' All rendering, etc, omitted for clarity.
3    
4        Private _TextBox As TextBox
5        Private _RadioButtonList As RadioButtonList
6    
7        Public Event SelectedValueChanged(ByVal sender As Object, ByVal e As EventArgs, ByVal NewValue As String)
8    
9    
10       Private Sub TextboxTextChangedHandler(ByVal sender As Object, ByVal e As EventArgs)
11           RaiseEvent SelectedValueChanged(sender, e, _TextBox.Text)
12       End Sub
13   
14       Private Sub RadiobuttonListChangedHandler(ByVal sender As Object, ByVal e As EventArgs)
15           RaiseEvent SelectedValueChanged(sender, e, _RadioButtonList.SelectedIndex.ToString())
16       End Sub
17   
18   
19       Public Sub New()
20           ' Wire up handlers
21           AddHandler _TextBox.TextChanged, AddressOf TextboxTextChangedHandler
22           AddHandler _RadioButtonList.SelectedIndexChanged, AddressOf RadiobuttonListChangedHandler
23       End Sub
24   
25   
26   
27   End Class

 

Let me know how you go on.

bgs264