Top React Hooks — Placeholder and Titles

Top React Hooks — Placeholder and Titles

Learn all about React Hooks with this hands-on guide. ... should sit at the top-level of your component; Only call Hooks from React functional ... We have people on the React, Angular and Vue teams, so we will use these framework names as our ... <input ref={inputRef} type="search" id="add-todo" placeholder="Add Todo.

Hooks contains our logic code in our React app.

We can create our own hooks and use hooks provided by other people.

In this article, we’ll look at some useful React hooks.

react-optimistic-ui-hook

The react-optimistic-ui-hook library lets us create a UI that doesn’t wait for an operation to finish to update the final state.

They immediately switch to the final state and show fake data while the read ones are loading.

We can install it by running:

npm install react-optimistic-ui-hook

or:

yarn add react-optimistic-ui-hook

Then we can use it by writing:

import React from "react";
import { useOptimisticUI } from "react-optimistic-ui-hook";

const USERNAME = "facebook";
const PREDICTED_AVATAR_URL = "http://placekitten.com/200/200";
const DELAY_IN_MS = 2000;
async function getGithubAvatarURL(username) {
  const response = await fetch(`https://api.github.com/users/${username}`);
  const data = await response.json();
  return new Promise(resolve => {
    setTimeout(() => {
      resolve(data.avatar_url);
    }, DELAY_IN_MS);
  });
}
export default function App() {
  const { status, result, error } = useOptimisticUI(
    () => getGithubAvatarURL(USERNAME),
    PREDICTED_AVATAR_URL
  );
  return (
    <div>
      <img src={result} alt="avatar" />
      <p>Status: {status}</p>
      <p>Error: {JSON.stringify(error)}</p>
    </div>
  );
}

We have the getGithubAvatarURL function that gets the avatar of the Github user asynchronously.

Then we can use that with the useOptimisticUI hook to run the promise.

The first argument has the callback that gets the data.

The 2nd is the URL for the placeholder to show when the real data is being downloaded.

The hook returns the status which is the loading status of the image.

result is the result, which is the resolved value of the promise returned from getGithubAvatarURL .

error has any errors that occurred.

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