Could not enter callback of history.block when a page was loaded first

[fengxinming]

Version

history: 4.10.1

Test Case

https://codesandbox.io/s/billowing-cache-oijj8

Steps to reproduce

Expected Behavior

expect confirmation dialog show up when a page was loaded first

Actual Behavior

[StringEpsilon]

As per the docs: The blocking only affects what history can register and properly intercept - and only on the transition between locations. With your particular situation, the initial location is already registered (in createHashHistory) when you activate the block. So history can't know to show the confirmation dialog, because there simply isn't any transition from "no location" to "initial page".

So, you have to prompt the user yourself on initial load.

[fengxinming]

@StringEpsilon Actually, it is just a demo to show case when a page initial load that can not affect history.block. I was not only to prompt the user on initial load, I wanted to provided navigation guards with history.block and getUserConfirmation, I have finished two guard hooks beforeEach and beforeEnter, but they were not called on on initial load, it because of history.block.