Remove Clear Button for Required Field

Miles

created 13 years ago

I'm trying to remove the clear button on a referenced object field because it is a required property (similar to http://www.devexpress.com/issue=Q290546), but I can't seem to find how to do this.
I keep finding references to K18055, but it can't figure out which controller to use to get the action. I've also seen references to AQ16459, but other articles say this example is out of date.
Any help would be appreciated.

Answers approved by DevExpress Support

Anatol (DevExpress)

created 13 years ago (modified 8 years ago)

To hide the Clear button in the LookupPropertyEditor, set the IModelCommonMemberViewItem.AllowClear property of a corresponding member to false using the Model Editor. Refer to the following ticket for more details: Usability - Make it possible to hide Clear Action via the application model.

Show previous comments (5)

Miles 13 years ago

That seems to work fine, but how do I direct it to only be disabled on certain fields? Also, how do I do the same thing on the web interface (which has the new and clear button inline)?

DevExpress Support Team 13 years ago

Hi Miles,
We are working on your issue and will answer you as soon as possible. We are sorry for the delay.
Thanks,
Michael.

Dennis Garavsky (DevExpress) 13 years ago

Hello Miles,
To disable it only for certain fields, you can implement a different controller that will iterate through the DetailView.GetItems<LookupPropertyEditor> collection and test its Id property.
After that, you can access a required controller using the LookupPropertyEditor.Frame property.
On the Web, you can use the solution suggested at ASPxLookupDropDownEdit - ClearingEnabled.
I hope you find this information helpful.
Thanks,
Dennis

Miles 13 years ago

I haven't tried the Web side yet, but in the Win app the frame keeps coming up as null. Here is the code I'm using:
Private Sub LookupController_ViewControlsCreated(sender As Object, e As EventArgs) Handles Me.ViewControlsCreated
        Dim cView = TryCast(Me.View, CompositeView)
        If cView Is Nothing Then Return
        Dim editors = cView.GetItems(Of LookupPropertyEditor)()
        If editors Is Nothing Then Return
        For Each editor In editors
            Dim attr = editor.MemberInfo.FindAttribute(Of RuleRequiredFieldAttribute)()
            If attr Is Nothing Then Continue For
            Dim controller = editor.Frame.GetController(Of LookupWindowController)()
            If controller Is Nothing Then Continue For
            controller.ClearAction.Enabled("CanClear") = False
        Next editor
    End Sub

Dennis Garavsky (DevExpress) 13 years ago

Hello Miles,
Thank you for the update. Allow me some additional time to investigate this issue. Your patience is greatly appreciated!
Thanks,
Dennis

Dennis Garavsky (DevExpress) 13 years ago

Hi,
I apologize. My previous answer was inaccurate because the Frame property is lazy. You can use the following code to access it:

C#
public class MyClass : ViewController<DetailView> {  

    private LookupPropertyEditor editor;  
    protected override void OnActivated() {  
        base.OnActivated();  
        editor = (LookupPropertyEditor)View.FindItem("Manager");  
        editor.ControlCreated += new EventHandler<EventArgs>(MyClass_ControlCreated);  
    }  
    void MyClass_ControlCreated(object sender, EventArgs e) {  
        ((LookupPropertyEditor)sender).Control.Popup += new EventHandler(Control_Popup);  
    }  

    void Control_Popup(object sender, EventArgs e) {  
        //Dennis: Access editor.Frame here.  
    }  
}

Thanks,
Dennis
P.S.
5 days of expert eXpressApp Framework (XAF) training is now available!

Miles 13 years ago

Finally got it working for both the web and windows versions. For anyone interested, my code is attached.

RemoveClea...Button.zip

Dennis Garavsky (DevExpress) 13 years ago

Thank you for informing us of your results, Miles!
Regards,
Dennis
P.S.
5 days of expert eXpressApp Framework (XAF) training is now available!

Created: March 5, 2012 6:04 PM

Modified: April 18, 2017 11:39 PM

Platform: App Frameworks (UI, API, ORM)

Product: XAF - Specify UI Platform

Build: 11.2.8

IDE: Microsoft Visual Studio 2010

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Remove Clear Button for Required Field

Answers approved by DevExpress Support

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