Complex Form Validation in Joomla

[Paul van Haren]

Hi,

I'm trying to implement complex form validation for a module admin form. The form validation will require a couple of form fields and then run some queries on the Internet. I'm looking for advice how to best implement this.

I've come across the onContentNormaliseRequestData event, and I think I can make this work more or less, but it doesn't feel optimal. 

1. onContentNormaliseRequestData is triggered before the server-side field validators are executed. Thus,the order of validations is not optimal.
   
2. I don't know how to pass return information or error messages from the plug-in. It appears that nothings gets done with the error messages, nor with the return status, see libraries/src/MVC/Controller/FormController.php.ModulesControllerModule->save(): lineno 708
3. I would have hoped that there is a simpler mechanism, similar to the server-side field validation mechanism, to implement such form validation.

Any help is appreciated.

Best regards, Paul

[Mark Dexter]

Another approach would be to use a template override for the module edit view. That gives you complete control over the edit view. It's a bit of a kluge but it works.

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