ComboBox cancel update from list

ComboBox cancel update from list

Posted by: kbj on 28 April 2018, 12:15 pm EST

• 

  kbj

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  Posted 28 April 2018, 12:15 pm EST

  Hi all,
  
  Is there a way to cancel the changing of the value property of a combobox when the user selects an item from the dropdown list?
  
  Thanks,
  
  Kingman

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  Ruchir.Agarwal

  

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  Posted 30 April 2018, 3:33 am EST

  Hi Kingman,
  
  From what I understand, you wish that when selecting a particular item from Combobox, the Value property should remain unchanged while the selection should still change in Combobox.
  
  If that is the case, then for that you first need to set TextDetached property to true and then inside ValueChanged event invoke the ValidateText method as follows:
  
  I have also attached a sample application for your reference.

  private void C1ComboBox4_ValueChanged(object sender, EventArgs e)
  {
       if(test_c1ComboBox.Value.ToString()=="c")
       {
            test_c1ComboBox.ValidateText();
       }
       Console.WriteLine($"Combobox's Value: {test_c1ComboBox.Value}");
  }
  

  Thanks,
  
  Ruchir AgarwalComboBox_Value.zip

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  kbj

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  Posted 30 April 2018, 8:03 am EST

  Hi Ruchir,
  
  Thanks for the quick response. What I am looking for is for the text property not to change when a user selects a certain list item. I would like the value to change.
  
  In the below example, selecting February would leave the Text as whatever it was, but change the Value to “February”
  
  Private Sub Form1_Load(sender As Object, e As EventArgs) Handles MyBase.Load
  
  cb2.AutoCompleteMode = AutoCompleteMode.Suggest
  
  cb2.AutoCompleteSource = AutoCompleteSource.CustomSource
  
  cb2.Items.AddRange(New String() {“January”, “February”, “August”})
  
  cb2.AutoCompleteCustomSource.AddRange(New String() {
  
  “January”,
  
  “February”,
  
  “March”,
  
  “April”,
  
  “May”,
  
  “June”,
  
  “July”,
  
  “August”,
  
  “September”,
  
  “October”,
  
  “November”,
  
  “December”
  
  })
  
  End Sub
  
  Private Sub _ValueChanged(ByVal sender As Object, ByVal e As EventArgs) Handles cb2.ValueChanged
  
  If cb2.Value.ToString() = “February” Then
  
  cb2.DoSomethingThatWon’tChangeTheText()
  
  End If
  
  Console.WriteLine($“Combobox’s Value: {cb2.Value}”)

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  Ruchir.Agarwal

  

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  Posted 1 May 2018, 7:38 am EST

  Hi,

  Thank you for clarifying.
  
  However, I do not seem to find a direct solution for your requirement. So, if you could share your use-case as to why you need to change value but not the text, then probably I can help you achieve that using some workaround.
  
  Also, in addition to above, please mention your requirements with two aspects:

  1. When user types, suggestion appears and user selects an item: In this case, do you wish to show the selected item or the text that was typed.
  2. When user clicks dropdown button, dropdown opens and user selects an item: In this case, do you wish to show the selected item or the text that was typed.

  Thanks,
  
  Ruchir Agarwal