View Transition Animation in React.js App

Other day me want create quick remove items from list animation for site. This time skip React Transition Group, try new View Transition, save time.

Why write lot code when few code do trick.

View Transition API Chrome only, but me no care.

Crux is document.startViewTransition.

But need establish DOM before state, after state, but React.js don’t allow.

React.js reactive. Not synchronous. document.startViewTransition need synchronous.

Ask Google learn:

import { flushSync } from "react-dom";

flushSync(() => setState(...));

Me write hook:

import { useState } from "react";
import { flushSync } from "react-dom";

export const useViewTransition =
  typeof document !== "undefined" && "startViewTransition" in document
    ? <T>(newValue: T) => {
        const [value, setValue] = useState<T>(newValue);
        if (value !== newValue) {
          document.startViewTransition(() => {
            flushSync(() => {
              setValue(newValue);
            });
          });
        }
        return value;
      }
    : <T>(value: T) => value;

If use useQuery

const { data: newMsgs } = useQuery({
  queryKey: ["msgs"],
  queryFn: msgs.all(25)
});

const msgs = useViewTransition(newMsgs);

return (
  <ol>
    {msgs?.map(item => (
      <li 
        key={item.id} 
        style={{
          viewTransitionName: "msg-" + item.id,
          viewTransitionClass: "mymsg",
        }}
      >
        {item.title}
      </li>
    ))}
  </ol>
);

Now when useQuery update, hook call document.startViewTransition then setState.

Need global CSS

Me add global.css:

@supports (view-transition-name: none) {
  ::view-transition-group(root) {
    animation-duration: 0s;
  }
  ::view-transition-group(.mymsg) {
    animation-duration: 0.4s;
  }
}

This tell Chrome: don’t transition whole page, only transition list items.

Now message list animation work. Very nice.

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