Intercepting a Form Submission

[Medianomaly]

Hi,

Hoping someone can help a developer noob with a question --

Is it possible to intercept a form submission before it is processed, run a check on the fields submitted, and only complete submission if a certain custom condition is met?

The 'processFormData' hook appears to fire after the submission, so I can't use that.

I've also tried the 'validateFormField' hook, but I can't figure out how to use it -- i.e. how to access the properties in the Widget object that is passed through.

How would a seasoned developer handle this?

Thanks!

EDIT:

Now I'm extending the Form Class, writing a custom processFormData() method that runs my checks before calling parent:rocessFormData(). That sounds like something someone who knows what are were doing would do...

[ga.n]

which properties do you need?

you can get a list of available properties looking at the widget api

http://api.contao.org/__filesource/f....php.html#a212

if you want to "invalidate" the widget passed to the validateFormField hook just add an error to it using the addError method

http://api.contao.org/__filesource/f....php.html#a255

hope this helps in some way

[Medianomaly]

Thanks again, Ga.N -- the API is definitely making more sense to me lately (before it just scared me).

I don't know what I was doing wrong before (and I scrapped the code), but when I used the 'validateFormField' hook, it seemed that no matter what I tried, I was unable get any property values from the Widget object that was passed through.

For instance '$objWidget -> strClass' would always give me a blank value, even if the Widget item actually had a class applied to it.

[ga.n]

Thanks again, Ga.N -- the API is definitely making more sense to me lately (before it just scared me).

I don't know what I was doing wrong before (and I scrapped the code), but when I used the 'validateFormField' hook, it seemed that no matter what I tried, I was unable get any property values from the Widget object that was passed through.

For instance '$objWidget -> strClass' would always give me a blank value, even if the Widget item actually had a class applied to it.

you can't retrieve the strClass property because it is "protected" but you can retrieve the 'class' property (as you can see looking at the __get method of the Widget class)

[Medianomaly]

Ahh -- I completely see what you mean now, thanks!

[thyon]

The FormAuto module uses EVERY single form interception there is. Both loading and rendering form widgets (to add content to the label and prevent submission with errors) and also post-process the form using the HOOK. Look at the formauto/config/config.php file to see how many HOOKS you need to process the form.