D365 F&O: Event Handler on Form

On DataSource on form CustTable

class CustTableFormEventHandler
{
    [FormDataSourceEventHandler(formDataSourceStr(CustTable, CustTable), FormDataSourceEventType::Activated)]
    public static void CustTable_OnActivated(FormDataSource sender, FormDataSourceEventArgs e)
    {
        CustTable                   custTable     = sender.cursor();
        FormDataSource      custTable_ds  = sender.formRun().dataSource("CustTable");
        FormRun                    element       = sender.formRun() as FormRun;
        FormControl              myNewButton   = element.design(0).controlName("MyNewButton");

        myNewButton.enabled(false);
    }

}

On method on form SalesEditLines

-- Method closeOk

[PostHandlerFor(formStr(SalesEditLines), formMethodStr(SalesEditLines, closeOk))]

    public static void SalesEditLines_Post_closeOk(XppPrePostArgs args)

    {

        FormRun sender = args.getThis();

        SalesParmTable salesParmTable;

        SalesTable salesTable;

        SalesDocumentStatus docStatus;

        ;

        salesParmTable = sender.dataSource(formdatasourcestr(SalesEditLines, SalesParmTable)).cursor();

        salesTable = SalesTable::find(salesParmTable.SalesId);

        docStatus = salesParmTable.documentStatus();

        if(docStatus != DocumentStatus::PackingSlip)

        {

            return;

        }

//Som source codes in here

    }

-- Event Closing

[FormEventHandler(formStr(SalesEditLines), FormEventType::Closing)]

    public static void SalesEditLines_OnClosing(xFormRun sender, FormEventArgs e)

    {

        FormDataSource datasource_ds = sender.dataSource(formDataSourceStr(SalesEditLines, SalesLines));

        SalesLine buffTable = datasource_ds.cursor();

    }

***

[FormEventHandler(formStr(TSExtensionInstanceTest), FormEventType::Initialized)]

    public static void TSExtensionInstanceTest_OnInitialized(xFormRun sender, FormEventArgs e)

    {

        FormRun formRun = sender as FormRun;

        TSExtensionInstanceTestHandler extensionInstance = formRun.getExtensionInstance(classStr(TSExtensionInstanceTestHandler));

        extensionInstance.init();

    }

On method Modified of field in datasource TrvRequisitionLine on form

[FormDataFieldEventHandler(formDataFieldStr(TrvRequisition, TrvRequisitionLine, Category),

        FormDataFieldEventType::Modified)]

        public static void Category_OnModified(FormDataObject sender, FormDataFieldEventArgs e)

    {

        FormDataSource              trvRequisitionLine_DS;

        TrvRequisitionTable         requisitionTable;

        TrvRequisitionLine          requisitionLine;

        ormReferenceGroupControl    formControlLocationDetail;

        //Get datasouce

        trvRequisitionLine_DS = sender.datasource();

        //Get the formRun

        formRun = TrvRequisitionLine_DS.formRun();

        //Get currently selected record

        requisitionLine = trvRequisitionLine_DS.cursor();

        //Get any other datasouce you want form form with help of relation

        requisitionTable = TrvRequisitionTable::find(requisitionLine.TrvRequisitionTable);

        //Set any value of record field value based on your calculation

        requisitionLine.AccountingCurrencyAmount = 0;//TODO::Some calculations you need to do and set value of amount

        //Change state of any control on form

        formControlLocationDetail =

        formRun.design().controlName(formControlStr(TrvRequisition,PerdiemTrvLocations_Details));

        formControlLocationDetail.mandatory(false);

        formControlLocationDetail.enabled(false);

    }

On method Clicked of button on form

[FormControlEventHandler(formControlStr(TSExtensionInstanceTest, Counter), FormControlEventType::Clicked)]

    public static void Toggle_OnClicked(FormControl sender, FormControlEventArgs e)

    {

        FormRun                    element       = sender.formRun() as FormRun;
        FormControl              myNewButton   = element.design(0).controlName("MyNewButton");

        myNewButton.enabled(false);

    }