Cannot set properties of null (setting 'currentTime'), when transition

[Plikard]

Describe the bug

When playing audio HTML element with binded currentTime value becomes hidden with transition, the Svelte still tries to set the value of the now missing property (while animated), which results in an error Cannot set properties of null.

Reproduction

Full example: REPL

Press play and then hide the player

Logs

System Info

Chrome 131

Severity

annoyance

[gyzerok]

This is a continuation of #15008

@paoloricciuti perhaps you might want to take a look, since you fixed the first one

[paoloricciuti]

Yeah I took a quick look, I think I know what's happening but I need to figure that out at the desk

[paoloricciuti]

Uhm actually...i don't think there's much we can do here. What is happening is that by using a transition you are delaying the unmount of the element from the DOM. So the audio keep playing and the time keeps changing. But since you are binding to a variable that is now null it errors out.

But when you have a transition the element needs to stay, and as long as an element is in the dom the bind needs to still be applied (especially because you could write to an external variable which is not affected by the if).

Imagine for example a situation like this...would you expect the time to not update while the transition is playing?

[gyzerok]

Maybe I am missing something, but the audio shouldn't be playing because we paused it before unmount since we pressed stop

[paoloricciuti]

Maybe I am missing something, but the audio shouldn't be playing because we paused it before unmount since we pressed stop

You never actually paused the audio...you rely on the removal of the element from the Dom for it to stop but if you are using a transition that happens after the transition

[mrkishi]

They tried to pause through the paused binding, but it does behave a little weird: it seems like the bindings' gets keep running during transitions, but not sets... sometimes.

In this version, try jumping after pausing, while the outro is still playing. It works if you pause through the audio native controls, but not through the <button>—even though both triggered the transition by setting playing = false.

[gyzerok]

@paoloricciuti I think the previous comment nicely outlines why I think it is actually a bug that needs to be fixed. Mind taking another look?

[paoloricciuti]

I actually took a look yesterday: the fact that sets are disabled is definitely expected (all the other binding do the same too). However the other bindings prevents you from writing the get so I guess we need to fix this here. Will see if I can do something later