Form Event handler methods in Dynamics 365 FO

Hi Guys,

Let’s discuss today the different event handlers in Dynamics 365 FO. Now we don't have the leverage 😉to overwrite existing code anymore so all you have is event handlers to manipulate standard functionality. However, event handlers were available in the earlier version as an optional and best practice but now it’s the only option. I will be sharing different event handler so we can cover most of the methods with different parameters.

1. Form dataSource event handler: Here I will be using the vendTable form to get table buffer and perform additional business logic or validation.
Vendtable = Form name
vendTable = form data source name
[FormDataSourceEventHandler(formDataSourceStr(Vendtable, vendTable), FormDataSourceEventType::Written)]
public static void vendTable_OnWritten(FormDataSource sender, FormDataSourceEventArgs e)
{
    FormRun                 form           = sender.formRun();
    FormDataSource          vendTable_ds =       form.dataSource(formDataSourceStr(Vendtable,Vendtable)) as FormDataSource;
   Vendtable     Vendtable= vendTable_ds.cursor();
<Now to got table buffer, perform business logic/validation>
}
lets see one more example below;

2. Form DataSource while closing the form (same will apply for OnInitialized,
[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();
<YOUR CODE>
}   

3.  Post-event hander of Form init or any other standard method method
[[PostHandlerFor(formStr(Ledger), formMethodStr(Ledger, init))]
    public static void Ledger_Post_init(XppPrePostArgs _args)
    {
        #ISOCountryRegionCodes
        FormRun form = _args.getThis();
        FormDesign design = form.design();
        FormControl revaluationAccount = design.controlName(formControlStr(Ledger, revaluationAccount));
        FormControl currencyRevaluation = design.controlName(formControlStr(Ledger, currencyRevaluation));
<your code>
}

4. Form control event hander:
[FormControlEventHandler(formControlStr(LogisticsPostalAddress, Roles), FormControlEventType::Modified)]
    public static void Roles_OnModified(FormControl sender, FormControlEventArgs e)
    {
        FormRun element = sender.formRun();
        FormControl purposeCtrl   = element.design().controlName(formControlStr(LogisticsPostalAddress, Roles));
       
        FormDataSource logisticsLocation_DS = element.dataSource(formDataSourceStr(LogisticsPostalAddress, LogisticsLocation));
       <business logic>
    }

Cheers,

Harry
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Edit/Display or new methods on standard application objects

Hi Folks,
Let’s see how to write a new method on standard application object using the extension framework. An extension enables you to add functionality to existing model elements and source code.
Before starting adding new method, you need to create a new extension class for your object and this class should be declared as final and post fixed by ‘Extension’ keyword. See below example,

For Table:
[ExtensionOf(tableStr(CustTable))]
final class MyCustTable_Extension
{
<new methods>
}

For Class:
[ExtensionOf(classStr(CustExchAdj))]
final class MyCustExchAdj_Extension
{
<new methods>
}

For Form:
[ExtensionOf(formStr(VendParameters))]
final class MyVendParameters _Extension
{
<new methods>
}

Now lets see how to add different types of methods

1. New edit method
For Extension methods, the first argument in method parameter must be the object you're extending e.g. table buffer. See below code for reference;
public static edit str60 MyFieldEdit(<tableName> _this, boolean _set, name value)
{
MyTable mytable = <tablename>;
if(_set)
{
if(value)
{
ttsbegin;
custTable = CustTable::find(<tablename>.CustAccount,true);
custTable.Name = value;
custTable.update();
ttscommit;
}
}
}

2. New display method
public static display EcoResDescription productName(InventSum _this)
{
Return _this.itemName();
}

3. Normal method
In the same way, you can write a new method, this method also needs to be static so it can be accessed on the form.
Public static updateSearchName(_this, Name _newName)
{
Mytable mytable = _this;
If(_newname)
{
Ttsbegin;
Mytable.searchName = _ newname;
MyTable.update();
Ttscommit;
}
}

Edit method on table extension or new methods on table extension, all method needs to be static. Now to access these methods, go to your form and add new field type of string/real/XYZ. Set below property


Cheers,
Harry