D365 / AX 7 - How to override form control methods

Purpose:

The purpose of this document is to show how to override form control methods without overlaying in Dynamics 365 for Operations

Development:

To demonstrate we are using the HRMCompFixedEmplActionDialog form and going to override the planId_Control lookup method.

First of all, create new event handler class HRMCompFixedEmplActionDialogEventHandler and subscribe to post-event handler of form init.

/// <summary>

/// The <c>HRMCompFixedEmplActionDialogEventHandler</c> class is the event handler class

/// for managing HRMCompFixedEmplActionDialog form events

/// </summary>

class HRMCompFixedEmplActionDialogEventHandler

{     

    /// <summary>

    ///  Post event handler for HRMCompFixedEmplActionDialog

    /// </summary>

    /// <param name="_args">Event args</param>

    [PostHandlerFor(formStr(HRMCompFixedEmplActionDialog), formMethodStr(HRMCompFixedEmplActionDialog, init))]

    public static void HRMCompFixedEmplActionDialog_Post_init(XppPrePostArgs _args)

    {

        FormRun formRun = _args.getThis();

        var methodOverrides = HRMCompFixedEmplActionDialogEventHandler::construct();

        FormStringControl PlanIdctrl = formRun.design().controlName(formControlStr(HRMCompFixedEmplActionDialog, planId_Control));

        PlanIdctrl.registerOverrideMethod(methodStr(FormStringControl, lookup), methodStr(HRMCompFixedEmplActionDialogEventHandler, LookupPlanId ), methodOverrides );

    }

    /// <summary>

    /// Constructs a new instance of <c>HRMCompFixedEmplActionDialogEventHandler</c> class.

    /// </summary>

    /// <returns>

    /// A <c>HRMCompFixedEmplActionDialogEventHandler</c> class.

    /// </returns>

    public static HRMCompFixedEmplActionDialogEventHandler construct()

    {

        return new HRMCompFixedEmplActionDialogEventHandler();

    }

    /// <summary>

    ///    Overrided method for Plan id lookup

    /// </summary>

    /// <param name="_ctrl">

    /// FormStringControl buffer

    /// </param>

    public void LookupPlanId(FormStringControl _ctrl)

    {

        SysTableLookup      sysTableLookup = SysTableLookup::newParameters(tableNum(HRMCompFixedPlanTable), _ctrl);

        Query               query;

        QueryBuildDataSource qbds = query.addDataSource(tablenum(HRMCompFixedPlanTable));

        sysTableLookup.addLookupfield(fieldNum(HRMCompFixedPlanTable, PlanId));

        sysTableLookup.addLookupfield(fieldNum(HRMCompFixedPlanTable, Description));

        sysTableLookup.addLookupfield(fieldNum(HRMCompFixedPlanTable, Type));

        sysTableLookup.addLookupfield(fieldNum(HRMCompFixedPlanTable, CurrencyCode));

        sysTableLookup.addLookupfield(fieldNum(HRMCompFixedPlanTable, PayFrequencyId));

        sysTableLookup.parmQuery(query);

        sysTableLookup.performFormLookup();

    }

}

Using this the approach we can override any form of control methods