core modification

hello

Is it possible to overload a core element? if so could someone give me some clue to do it, or the name of any module that will do something similar ?

for example, I'd like to add the possibility to set an onclick event on the submit button of a form

Thank's in advance.

Hi Eric,
Most core modifications are possible, but if you give some detailed information on what you're trying to achieve then we can better help.

Thank's for your help.

As I said, I'd like to extend the "capabilities" of the submit button of the Form module, with an other module in order to add an "onclick" tag with some parameters that I would have defined before on the back end.

So I don't want to modify core files but hook them to "plug" an add-on.

Regards

Are you talking about the frontend or the backend?

I can not understand if you want to know how to load a javascript file or if you are looking for something else

i'd like to add from the back end parameters in order to generate some more parameters during the creation of the form in the front end.

how could I do to modify the generate function of the FormSubmit, without touching the original file?

Thank's

you can write a custom "form field" widget

a good starting point can be taking a look at some extensions that provide "form fields"

http://www.contao.org/extension-list...m%20field.html

Thank's I'll have look.