sfComboBox - KeyPress event is not working
Hi,
I have to create a Combobox that will accept user input (of course NOT dropdown list mode). However, the input must be limited to words in list items only, not any other character. Means it should stop on word other than present in the item list. Same time it should accept backspace and enter key.
Have tried to achieve the above using the 'KeyPress' event. However, it's not working.
Request you to provide solutions to achieve the same.
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8 Replies
1 reply marked as answer
EM
Elakkiya Muthukumarasamy
Syncfusion Team
March 12, 2021 01:45 PM UTC
Hi RAAHUL,
Greetings from Syncfusion.
We have checked your query and we would like to let you know that you can achieve this by using DropDownOpening event. You can avoid DropDown list opening set e.cancel is true. Please refer the below sample and code snippet for the same.
Code example:
|
sfComboBox2.DropDownOpening += SfComboBox2_DropDownOpening;
sfComboBox2.AutoCompleteMode = AutoCompleteMode.SuggestAppend;
private void SfComboBox2_DropDownOpening(object sender, Syncfusion.WinForms.ListView.Events.DropDownOpeningEventArgs e)
{
e.Cancel=true;
} |
Sample link: https://www.syncfusion.com/downloads/support/directtrac/general/ze/SfCombobox_Indexof_sample-1729052449
Please try it with the above solution and let us know if you need any other further assistance on this. We will be glad to assist you.
Regards,
Elakkiya
RA
RAAHUL
March 12, 2021 05:58 PM UTC
Hi Elakkiya,
Attachment: combobox_4fb66cfe.zip
Thanks for the update. The solution provided will not suffice my requirement.
For Ex:
ComboBox contains the following list as Datasource.
1.
Dim usStates As New List(Of String)()
usStates.Add("Alaska")
usStates.Add("Arizona")
usStates.Add("Arkansas")
usStates.Add("California")
usStates.Add("Colorado")
usStates.Add("Connecticut")
usStates.Add("Delaware")
usStates.Add("Florida")
usStates.Add("Georgia")
sfComboBox1.DataSource = usStates
2. DropDownStyle = Dropdown
3. ComboBoxMode = SingleSelection
4. AutoCompleteMode = SuggestAppend
4. AutoCompleteSuggestMode = StartsWith
Now, when the user enters letters other than those mentioned in the List then it should not type in textbox.
For Ex. the user tries to enter the letter "B" or "b", then it should not type. This can be achieved by using the KeyPress event.
Refer attached sample example.
Note: The attached sample contains both conventional ComboBox and sfComboBox. Code is working fine with Microsoft ComboBox. However, not with sfComboBox.
Attachment: combobox_4fb66cfe.zip
EM
Elakkiya Muthukumarasamy
Syncfusion Team
March 15, 2021 02:06 PM UTC
Hi RAAHUL,
Thanks for your update.
We are working on this reported query “When the user enters letters other than those mentioned in the List then it should not type in textbox.” and we will update you the further details on 17th March 2021.We appreciate your patience until then.
Regards,
Elakkiya
RA
RAAHUL
March 16, 2021 03:43 PM UTC
Hi,
Attachment: Combobox_aadcd265.rar
Attached wrong sample.
Please find attached an updated sample.
Regards,
Raahul
Attachment: Combobox_aadcd265.rar
VR
Vijayalakshmi Roopkumar
Syncfusion Team
March 17, 2021 12:55 PM UTC
Hi Raahul
Thank you for your update.
We were able to reproduce the reported behavior with "KeyPress event is not working with SfComboBox" and logged a defect report on this. The patch for this fix is estimated to be available on 7th April, 2021.
You can track the status of this defect using the following feedback link:
Please let us know if you have any other concerns.
Regards,
Vijayalakshmi VR
VR
Vijayalakshmi Roopkumar
Syncfusion Team
April 7, 2021 03:25 PM UTC
Thank you for your patience.
We have fixed the reported behavior “KeyPress event is not working in sfcombobox” and patch for the same can be downloaded from following links.
Assembly Version: 19.1.0.54
Installation Directions:
This patch should replace the files "Syncfusion.SfListView.Winforms” under the following folder.
$system drive:\ Files\Syncfusion\Essential Studio\$Version # \precompiledassemblies\$Version#\[TargetFramework]
Eg : $system drive:\Program Files\Syncfusion\Essential Studio\18.4.0.39\precompiledassemblies\18.4.0.39\4.6
To automatically run the Assembly Manager, please check the Run assembly manager checkbox option while installing the patch. If this option is unchecked, the patch will replace the assemblies in precompiled assemblies’ folder only. Then, you must manually copy and paste them to the preferred location or you must run the Syncfusion Assembly Manager application (available from the Syncfusion Dashboard, installed as a shortcut in the Application menu) to re-install assemblies.
Please try this patch and let us know if it is resolved at your end.
Feedback Link: https://www.syncfusion.com/feedback/23424/keypress-event-is-not-working-in-sfcombobox
Regards,
Vijayalakshmi VR
Marked as answer
Hello,
Can you inform me please, what was the solution of this question?
I would like to prevent or cancel the user input (typing) when the item is not in the list.
Thank you!
BR, SZL
GT
Gokul Thanudhas
Syncfusion Team
August 2, 2022 02:46 PM UTC
Hi Raahul,
We have created a sample based on your requirement. Please refer the sample for your reference.
Code Snippets
Private Sub SfComboBox1_KeyPress(sender As Object, e As KeyPressEventArgs) Handles SfComboBox1.KeyPress
If e.KeyChar = ControlChars.Back AndAlso e.KeyChar = ControlChars.Back Or Val(SfComboBox1.Text) >= 1 Then
Return
End If
Dim t As String = SfComboBox1.Text
Dim typed = t.Substring(0, SfComboBox1.Text.Length)
Dim newtext = typed & e.KeyChar
Dim view As List(Of Object) = SfComboBox1.DropDownListView.View.Items.ToList()
Dim filter As List(Of Object) = view.Where(Function(x) x.ToString().StartsWith(newtext, StringComparison.InvariantCultureIgnoreCase)).ToList()
If filter.Count = 0 Then
e.Handled = True
End If
End Sub
Regards,
Gokul T.
Attachment: Combobox_30faa53c.zip
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