CanvasItem: how to detect before save of a form?

[FernandoMarcelo]

CanvasItem documentation offers the following solution when you can't check for changes in your Canvas:

"If you cannot easily detect changes to values in your Canvas, a workaround is to call storeValue right before the form saves."

But how do i do that? Is there an event in CanvasItem?

[didierv]

The event you're looking for is the one where you save/submit the form.

For example, if you click on a Button, you will add the storeValue call in the click function of the button, just before saving the form.

[FernandoMarcelo]

Hmm, i thought i would be able to build a portable CanvasItem ( without requiring developers to place storeValue on submit ).

Thanks for the info didierv :)

[didierv]

It depends on what you put in your CanvasItem, and on what the value is. In my CanvasItems, I have used either SC objects, or custom javascript code in html panes. In both cases, I could use javascript events or SC callbacks to store the value as soon as it was changed.