def preventUnloadPopState(e):
global undoing
e.preventDefault()
state = e.state
if state:
undoing = True
history.go(current["pos"] - state["pos"]) # reverse the navigation
else:
# the user is determined to navigate away and has changed the url manually so let them!
# Not letting them will break the app...
current["pos"] += 1
state = {"url": location.hash, "pos": current["pos"]}
history.replaceState(state, "")
window.onbeforeunload = None
location.reload()
def onPopState(e):
global undoing, waiting
if undoing:
undoing = False
current["pos"] = history.state["pos"]
return
elif waiting:
return preventUnloadPopState(e)
state = e.state
if state: # then we're loading from back forward navigation
current["undo"] = current["pos"] - state["pos"]
current["pos"] = state["pos"]
else:
current["undo"] = -1
current["pos"] += 1
state = {"url": location.hash, "pos": current["pos"]}
history.replaceState(state, "", state["url"])
# we always favour the state['url'] over location.hash
# since we allow (replace_current_url=True, set_in_history=False)
_router.navigate()
def replaceState(url):
# set_in_history=True, replace_current_url=True
current["undo"] = 0
state = {"url": url, "pos": history.state["pos"]}
history.replaceState(state, "", url)
def replaceUrlNotState(url):
# set_in_history=False, replace_current_url=True
current["undo"] = 0
history.replaceState(history.state, "", url)
# Copyright (c) 2021 The Anvil Extras project team members listed at
# https://github.com/anvilistas/anvil-extras/graphs/contributors
#
# This software is published at https://github.com/anvilistas/anvil-extras
from functools import wraps
from anvil.js.window import history, location, window
from . import _router
__version__ = "2.1.0"
# re-initialise the state object which was overridden on load or this is a new session
state = history.state or {"url": location.hash, "pos": 0}
history.replaceState(state, "", state["url"])
# undo and pos are used for unload behavior
current = {"undo": 0, "pos": state["pos"]}
# Form Unload Behaviour - here we prevent the user from navigating away from the current form
# while we wait for the unload function to complete
undoing = False
waiting = False
# when the window back or forward button is pressed onPopState is triggered
# a popstate is also triggered from a change in the URL in this case the window.history.state will be None
def onPopState(e):
global undoing, waiting