how to add navigator progress。

[MiYogurt]

I have a special love for navigator progress。how to Implement? i try use AOP program type override history.pushState but i find could not，error forbidden me to do that。Did not found router lifecycle hooks when i reading source code. emmm.... did you have any idea to solve it。

i think use setInterval listen the location.href is not good idea。 because i want show preload return data status 。eg. success is green style, error is red style。

[silentworks]

Currently there are no hooks for the router, but this is something that is being discussed. You can follow this issue #157.

[Rich-Harris]

This can be done with the top-level preloading property, which is true when you start navigating and false once it succeeds. In your root layout component you could do something like this:

// routes/_layout.html
{#if preloading}
  <Preloading/>
{/if}

<svelte:component this={child.component} {...child.props}/>

Typically you would only want to show a preloading indicator after ~250ms — many navigations will complete in under that time, and will feel instant, in which case an indicator feels unnecessarily jarring.