Event handlers and post handlers in D365

Let’s discuss today, how to get the table buffers, form control values, class parameters and method arguments etc., while writing our own event-handlers in D365. I’ll elaborate this using example code snippets in this post. There are already very useful posts on this topic you can look into. Here I required these event handlers while doing customization in Item master.

Form data source event handler

 [FormDataSourceEventHandler(formDataSourceStr(EcoResProductDetailsExtended, InventTable), FormDataSourceEventType::Written)]

public static void InventTable_OnWritten(FormDataSource sender, FormDataSourceEventArgs e){

    FormRun                 form           = sender.formRun();

    FormDataSource          InventTable_ds =       form.dataSource(formDataSourceStr(EcoResProductDetailsExtended,InventTable)) as FormDataSource;

   InventTable             inventTable    = InventTable_ds.cursor();

}

Form event handler

Table Buffer on form closing event

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

public static void EcoResAttributeValue_OnClosing(xFormRun sender, FormEventArgs e)

{

     FormDataSource ecoResProduct_ds   =          sender.dataSource(formDataSourceStr(EcoResAttributeValue, EcoResProductAttributeValue));

      EcoResProductAttributeValue      ecoResAttributeValue = ecoResProduct_ds.cursor();

}   

Control value and form event level for which auto declaration must be set true

[FormControlEventHandler(formControlStr(EcoResProductCreate, OKButton), FormControlEventType::Clicked)]

public static void OKButton_OnClicked(FormControl sender, FormControlEventArgs e)

{

       FormRun             element       = sender.formRun();

       //form control

       FormControl         modelGroupRef = element.design(0).controlName("ModelGroupId");

        Info(strfmt(“Model Group %1”, modelGroupRef.valueStr()));

       //form parameter

       ItemId              itemId        = element.parmItemId();

}

Post handler for class method

[PostHandlerFor(classStr(EcoResProductReleaseManager), methodStr(EcoResProductReleaseManager, release))]

public static void EcoResProductReleaseManager_Post_release(XppPrePostArgs args){

     EcoResProductReleaseManager releaseMgr;

    //Getting the class object

    releaseMgr     = args.getThis();

   //Getting the class parameter

   ItemId itemId  = releaseMgr.parmItemId();

   //Getting the method argument

    boolean itemCreation = args.getArg("_isCreation");

}

Post handler for overriding table methods modified field and validate Write

[PostHandlerFor(tableStr(InventTable), tableMethodStr(InventTable, validateWrite))]

public static void InventTable_Post_validateWrite(XppPrePostArgs args)

{

      InventTable inventTable = args.getThis() as InventTable

      boolean ret = true;

      // Override the validations here and set the return value accordingly.

       Args.setReturnValue(ret);

}

[PostHandlerFor(tableStr(InventTable), tableMethodStr(InventTable, modifiedField))]

public static void InventTable_Post_modifiedField(XppPrePostArgs args)

{

        //Getting the table buffer

        InventTable inventTable = args.getThis() as InventTable

       //Getting the field id method argument.

        FieldId fieldModified = args.getArg("_fieldId");

        switch (fieldModified)

        {

            //Here you can write your logic on modified field method

                break;

        }

}

Hope this post will help to give you quick start in customization and writing your code in event handlers and post handlers. More information can be found over here