Check if form is in an alert

Anvil Q&A
1

Is there a way to know if a form has been opened in an alert?

We often have forms that are re-usable - sometimes as custom components, sometimes as routed-to stand-alone forms, and sometimes as alerts.

Is there a way to check if your form is “in” an alert?

A common example: Whether to show a “Cancel” button (and sometimes a “save” button). We’ll often pass as_alert=True as an optional keyword argument to control that visibility but I’m wondering if there’s a way for a form to introspect whether it’s loaded in an alert?

I thought about using self.parent but when loaded in an alert self.parent is None… maybe we could use that fact, but I’m never sure when self.parent is actually set.

2

There’s no built in way to do this

But a possible approach is to check if you have the x-close-alert event handler.
Which anvil will add if you are a form in an alert.


    def form_show(self, **event_args):
        in_alert = bool(self.get_event_handlers("x-close-alert"))
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