How to override form control Lookup using extensions. D365FO

How to override form control Lookup using extensions. D365FO

In D365FO we have a bunch of events to subscribe on a form control level:

right click on lookup event of control to subscribe the event and paste in class.

[FormControlEventHandler(formControlStr(PayrollEmployerTaxRegion, Overview_StateId), FormControlEventType::Lookup)]

    public static void Overview_StateId_OnLookup(FormControl sender, FormControlEventArgs e)

    {

                  // write your logic here

    }

Now to cancel parent event, D365FO provide a class FormControlCancelableSuperEventArgs

You can cancel the parent(Original event with below code)

        FormControlCancelableSuperEventArgs ce = e as FormControlCancelableSuperEventArgs;

        //cancel super() to prevent error.

        ce.CancelSuperCall();

// Here is the complete code sample to override form lookup and cancel the original code.

[FormControlEventHandler(formControlStr(PayrollEmployerTaxRegion, Overview_StateId), FormControlEventType::Lookup)]

    public static void Overview_StateId_OnLookup(FormControl sender, FormControlEventArgs e)

    {

        SysTableLookup      sysTableLookup  = SysTableLookup::newParameters(tableNum(LogisticsAddressState), sender);

        Query               query           = new Query();

        // Filter lookup to only show US states

        query.addDataSource(tableNum(LogisticsAddressState)).addRange(fieldNum(LogisticsAddressState, CountryRegionId)).value(LogisticsAddressCountryRegion::findByISOCode(SysCountryRegionCode::countryInfo(curext())).CountryRegionId);

        // Sort the lookup by state Id

        query.dataSourceTable(tableNum(LogisticsAddressState)).addOrderByField(fieldNum(LogisticsAddressState, StateId), SortOrder::Ascending);

        // Add fields

        sysTableLookup.addLookupfield(fieldNum(LogisticsAddressState, StateId));

        sysTableLookup.addLookupfield(fieldNum(LogisticsAddressState, Name));

        // Run lookup

        sysTableLookup.parmQuery(query);

        sysTableLookup.performFormLookup();

        FormControlCancelableSuperEventArgs ce = e as FormControlCancelableSuperEventArgs;

        //cancel super() to prevent error.

        ce.CancelSuperCall();

    } 

Delegate Result with EventHandlerResult 

In this article, we will show to get Results from delegate subscribe events.

In normal routine mostly Ax Technical use subscribe event of delegates and perform the required task and get the required result. Following are the few steps through them you can achieve the same.

Let's begin.

Step-1 Create a class with the name of SLD_DemoSample
Step-2 Add two methods Main and run in this class like below screenshot

Reference screenshot

Step-3 Create a delegate in the class with two parameters like below

delegate void showMessage(Description _msg, EventHandlerResult result)  {    }

Reference screenshot

Step-4 Subscribe to the event of newly created delegate and paste to the class 

Reference screenshot

  /// <summary>

    ///

    /// </summary>

    /// <param name="_msg"></param>

    /// <param name="result"></param>

    [SubscribesTo(classStr(SLD_DemoSample), delegateStr(SLD_DemoSample, showMessage))]

    public static void SLD_DemoSample_showMessage(Description _msg, EventHandlerResult result)

    {

        result.result(strFmt("Message received from run method is %1",_msg));

    }

Step-5 Use result object of  EventHandlerResult class (2nd parameter) to return the response to caller like result.result(strFmt("Message received from run method is %1",_msg));

Reference screenshot

Step-6 Now call the delegate from the method and pass the required parameter like below.

        EventHandlerResult result = new EventHandlerResult();
        Description message='Hello world this is an event handler';
         
         info('Before..');

         this.showMessage(Message,result);
        
         info(result.result());

         info('After...');

Reference screenshot

Please feel free to contact me if you are facing any issues during the implementation of this blog.

Dialog With Event handling

Create a Class with the name of Demo Dialog and extend it with RunBase class then write the following code.

Override the dialog method and fields in dialog in my case I added two fields customer account and customer name.

Override the getFromDialog method and set the value in the declared variable

Override the run method write the following code.

If you want to validate then override the validate method.

The dialogPostRun() method should override like below. This will allow calling to the event methods.

Now open dialog and personalize the customer account field and check the name of the field.

Then Create the modified event with a field name.

Now run the class and enjoy the modified events in the dialog