Best Practice to use Form_Show vs Init methods

Anvil Q&A
5

yes - it would be the equivalent of doing something natively in anvil a bit like

from .HomeForm import HomeForm
from .OtherForm import OtherForm

class MainForm(MainFormTemplate):
  def __init__(self, **properties):
    self._cache = {}
    self._forms = {'home': HomeForm, 'other':OtherForm}
    load_form('home')

  def load_form(self, form_name):
    form_to_load = self._cache.get(form_name)
    if form_to_load is None:
      # create an instance of the form_to_load and store in cache
      form_to_load = self._forms[form_name]() 
      self._cache[form_name] = form_to_load

    self.content_panel.clear()
    # the current form_instance no longer has a parent so it is no longer visible 
    # but it still exists 
    # above we have stored the form_instance in self._cache to load whenever we need
    self.content_panel.add_component(form_to_load)

In HashRouting there are a couple of ways to interact with the _cache

routing._cache # private method to check the _cache - a dict of the form
               # {url_hash: form_instance, ...}
routing.clear_cache()
routing.remove_from_cache(url_hash)
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