Whether to use event handlers on custom forms

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Posted on by Abhinay Tharwal

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Hi all,

Need some suggestion:

The requirement is, to execute some code on the click of a button on a custom form.
If we had a standard form, we would have had to write the code in a relevant event handler.
Since we have a custom form, the conundrum is whether to add a method to the buttons methods node, or
to create a helper class and add _OnClicked event handler and write the code there?

1. We no longer have server-client tiers.
2. Which is more manageable methods in custom forms or relevant event handlers.
3. To access global variables in events methods, parm methods are required.
4. To access any datasources or datasource records, additional cumbersome code needs to written.
5. In future, for any additional changes, all the events are to be checked.

Any suggestions are welcome!

With best regards,
Abhinay

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Martin Dráb 237,807 Most Valuable Professional on at

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You didn't mention the option that is usually the best - using a menu item button. This has many benefits, especially for reusability - you can easily call the logic from many places while defining all properties (such as the label) and security just once.

If it's not suitable for a menu item button, it's easier to use clicked() than an event handler. But shouldn't put much code there - rather create a separate method and call this method from clicked(). It's for discoverability and reusability.

But event handlers have their benefits too. For example, you can define a single handler method for events from multiple controls or forms.

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nmaenpaa 101,160 Moderator on at

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I would not develop any event handlers or Chain of Command augmentations on my own objects. They are useful when extending someone else's code (Microsoft's or ISV's). Also it makes more difficult for others to extend your solution if you are already heavily using events around your own code. But if this is a CUS project (and not ISV) then that wouldn't have an impact.

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Joris dG 17,775 on at

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As already mentioned I would avoid CoC and events on entirely custom forms for multiple reasons. The main one for me would be maintainability and readability.

Also, to some of your points. Forms can implement interfaces. This can greatly improve how you interact with and code against a form.

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Abhinay Tharwal 1,215 on at

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Thank you Martin, Nikolaos and Joris for your valuable suggestions!

goshoom I will consider the one method multiple controls' event handlers approach.

Joris dG I will keep in mind about the interface approach.

With best regards,

Abhinay

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