Using Chain of Command for Form Datasource and Form Controls.

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Posted on by Community Member

Hi All,

Since the arrival of chain of command, we have the possibility to use class variables and add code to protected methods in the chain.

I am trying to make an extension class for a form, with the use of the decorater as followed for example [ExtensionOf(formStr(SalesCopying))].

And using a public final class of my newly created class for the SalesCopying form.

This gives us the possibility to use CoC on methods of the form itself, but how can I use chain of command on datasource methods or on control methods?

Since every datasource and control has its own class now in 365 , I don't know how to use the decorater for my form extension class to use CoC on underlying methods on datasource and controls.

Do you have to make an extension class for every datasource and control you want to use CoC with, if so how do you distinguish this?

Thanks in advance,

Tom

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Development / Customization / SDK

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Martin Dráb 231,758 Most Valuable Professional on at

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RE: Using Chain of Command for Form Datasource and Form Controls.

CoC on form datasources and controls is supported since PU20 (therefore it indeed wasn't possible when the topic was discussed in this thread).
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Pavel Vorontsov 20 on at

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RE: Using Chain of Command for Form Datasource and Form Controls.

Hi,

It seems like you can use dataSource methods in chain of command, but extension class should extend dataSource. Something like:

[ExtensionOf(formDataSourceStr(WMSPickingRegistration, WMSOrderTrans))]

final class WMSPickingRegistrationWMSOrderTrans_Extension
{
public void write()

{
WMSOrderTrans wmsOrderTrans = this.cursor();
InventDimId inventDimIdOrig = wmsOrderTrans.orig().InventDimId;
next write();
}

Not sure about controls.
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Fedir Kryvyi 1,026 on at

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RE: Using Chain of Command for Form Datasource and Form Controls.

Hi Tom,

"So basically we need to use data events for the datasources and controls for those methods?"

Yes, basically you need to have eventHandlers for event that are fired from datasources|controls|form separately.

"What about our custom made methods, we can’t add those to an extension class if they are under a datasource."

No, you cannot add your custom methods to DS on class extension. However, usually this is the problem with edit methods, all other methods can be moved to a form level with some tricks. So the pipeline is

1. Move your custom methods from DS level to Form level

2. Move your custom form-level code to Extension class

3. Create evenHandlers for required events

4. Call your custom method using formhasmethod()onstruction

In this way you can also override methods like lookup, jumpRef, modified etc. for DS fields

Here is an article that might be useful: ievgensaxblog.wordpress.com/.../ax-7-how-to-override-form-data-source-field-methods-without-overlaying
Community Member on at

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RE: Using Chain of Command for Form Datasource and Form Controls.

Hi Fedir,

Thank you for your reply, what I meant to say by every datasource is it’s own seperate class with it’s own methods. Your answer for data events makes sense, however what if you have a same type of method on the form itself and on the data source like the init method or modified method. If you compare a form object with the compare and merge tool you can see the class name for the form itself and a class name for every control and datasource of that form. With a decerator called [DataSource] for example. Not the ds object where you want to call the refresh reread method for example. So basically we need to use data events for the datasources and controls for those methods? What about our custom made methods, we can’t add those to an extension class if they are under a datasource. Thanks for your answer it will help us, but we still have somethings that we need to figure out to remove all overlayering adjustments.

Greetings Tom,
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Fedir Kryvyi 1,026 on at

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RE: Using Chain of Command for Form Datasource and Form Controls.

Unfortunately you cannot use CoC on form datasources yet. I have heard that it might be added in future releases.

The only option is to use eventhandlers for form datasource events.

"Since every datasource and control has its own class now in 365" - what do you mean by that? you cannot implicitly instantiate an object of something like SalesTable_ds. They all are jusr FormDataSourceObjects so there is no way to create Extension objects for them at the moment

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