Transition enterFrom classes not working as expected

[bentefay]

What package within Headless UI are you using?

@headlessui/react

What version of that package are you using?

1.6.3

What browser are you using?

Chrome/Firefox

Reproduction URL

https://github.com/tailwindlabs/headlessui/blob/main/packages/playground-react/pages/transitions/component-examples/peek-a-boo.tsx

https://github.com/tailwindlabs/headlessui/blob/main/packages/playground-react/pages/transitions/component-examples/modal.tsx

https://headlessui.dev/react/transition

Describe your issue

Many of the examples for Transition in playground-react, the headlessui documentation and Tailwind UI apply transition in the className or enter attributes to achieve an enter effect. Some of these do not seem to be working as intended.

For example, take the React playground peek-a-boo example below:

<Transition
            show={isOpen}
            enter="transition-colors ease-in duration-[5s]"
            enterFrom="transform bg-red-500"
            enterTo="transform bg-blue-500"
            leave="transition-colors ease-in duration-[5s]"
            leaveFrom="transform bg-blue-500"
            leaveTo="transform bg-red-500"
            entered="bg-blue-500"
            className="h-64 rounded-md p-4 shadow"
          >
            Contents to show and hide
</Transition>

Notice how the div starts off with a transparent background rather than a red background despite having enterFrom set to bg-red-500.

The same issue exists with the modal - it is supposed to be fading in but instead just pops in:

Setting unmount={false} fixes the problem.

Digger deeper, I think I can see why this is happening. Taking the example from the Transition documentation:

function MyComponent() {
  const [isShowing, setIsShowing] = useState(false)

  return (
    <>
      <button onClick={() => setIsShowing((isShowing) => !isShowing)}>
        Toggle
      </button>
      <Transition
        show={isShowing}
        enter="transition-opacity duration-75"
        enterFrom="opacity-0"
        enterTo="opacity-100"
        leave="transition-opacity duration-150"
        leaveFrom="opacity-100"
        leaveTo="opacity-0"
      >
        I will fade in and out
      </Transition>
    </>
  )
}

At least in Chrome, this appears to have the following behaviour:

• The Transition component applies the enter and enterFrom classes for 1 frame. The classes duration-75 and opacity-0 were just applied, but the existing opacity is 100, so the browser starts animating from opacity: 100 to opacity: 0.
• In the next frame the browser continues the opacity transition from 100 to 0 (setting opacity to something like 0.97). The Transition component then removes the enterFrom classes and applies the enterTo classes. This starts animating from the current opacity of opacity: 0.97 back to opacity: 1
• In the next frame the opacity reaches 1 and transitionend fires.

Applying a className of opacity-0 fixes this issue, because the opacity is already 0 when the enterFrom classes are applied. Alternatively, applying transition-opacity and duration-75 to enterTo rather than enter fixes the problem because the browser does not try to animate the enterFrom.

This behaviour is a little confusing, particularly given many of the examples suffer from this problem. Is there a way to improve this? For example, could transition-property be set to none when applying enterFrom?

[htmnk]

Same issue here, enter works as intended on 1.6.1.

Broken on 1.6.2+

[RobinMalfait]

Hey! Thank you for your bug report!
Much appreciated! 🙏

This should be fixed by #1519, and will be available in the next release.

You can already try it using npm install @headlessui/react@insiders.

Can you verify that this works using the insiders build? Thanks!

[htmnk]

works for me on 1.6.4

[bentefay]

Yup, me too. Thanks!

[tdesero]

I think there is a similar issue now on v1.7.13 as I did not get the "enter" transition to work. Going back to v1.7.11 fixed it for me.

[sgrund14]

seeing a similar issue with the enter transition not working. have a simple toast like this

<Transition
                show={showToast}
                appear
                as={Fragment}
                enter="transition ease-out duration-200"
                enterFrom="opacity-0"
                enterTo="opacity-100"
                leave="transition ease-in duration-200"
                leaveFrom="opacity-100"
                leaveTo="opacity-0"
            >
                <Dialog onClose={() => setShowToast(false)}>
                    <Dialog.Panel className="bottom-xs shadow-default p-xxs right-xs fixed z-[1000] flex w-[240px]">
                        Panel Content
                    </Dialog.Panel>
                </Dialog>
            </Transition>

the leaveFrom transition is working, but the enterTo is not. some added context: this is the sibling of another Transition in my React component/ I have a another Transitioning Dialog that opens the toast when it is closed. The problem is that when I trigger the toast, it doesn't animate in. But it does animate out...

Another strange thing is that on the dialog that is a sibling, the enterTo transition is working fine. Any thoughts ?

Broken on v1.7.11 and 1.17.15 (latest)

[WesleyKapow]

Just hit this on latest 1.17.14 for vue. Solution was to use the separate transitions for backdrop and dialog as mentioned in the docs: https://headlessui.com/vue/dialog#transitions

[Ollynov]

Still having this issue on @headlessui/react": "^1.7.18",

As an example:

<Transition
as={Fragment}
enter="transition ease-in duration-1000"
enterFrom="opacity-50 translate-y-1"
enterTo="opacity-10 translate-y-0"
leave="transition ease-in duration-500"
leaveFrom="opacity-100 translate-y-0"
leaveTo="opacity-0 translate-y-1"
>

It seems like the "enterFrom" classes are just not being applied. Right now enterFrom has opacity-50 but whether I remove that or add some other class it wouldn't change. So it always begins with the default opacity-100. So you can animate from 100 to 0 or any similar combo, but can't animate from opacity-0 to opacity-100 for example.

So this makes it so any child under this Transition component appears immediately, but the fade-away effect after you close it works as expected.

[thinkafterbefore]

Same here. Broken on @headlessui/react": "^1.7.18"

<Transition
  show={pasteMode}
  appear={true}
  enter="transition-all duration-[10s] ease-in-out"
  enterFrom="opacity-0"
  enterTo="opacity-100"
  leave="transition-all duration-[10s] ease-in-out"
  leaveFrom="opacity-100"
  leaveTo="opacity-0"
>