Conceal an element along with its space, then signal the application to show alternative content using React

Greetings everyone! I seek assistance with a React Application that I am currently developing. As a newcomer to the Javascript world, I apologize if my inquiry seems trivial.

The application comprises of two main elements: a loader, implemented as a React component, and the app content, initially hidden from view.

The loader, simply an HTML and CSS animation, runs a task asynchronously. Once the task is complete, it transitions out by adding a specific class. Despite being hidden, the loader persists in taking up space due to its separate React Component nature.

My objective is simple - I want the loader to vanish completely once its task concludes, relinquishing its invisible hold on space. Simultaneously, the app content should be revealed upon the loader's completion. This seemingly straightforward task has me stumped.

How can I achieve this desired outcome? Any guidance would be greatly appreciated. Thank you kindly for your support.

Sneak Peek at My Code

App Component

function App() {
    componentDidMount() {
        Secure()
    }

    return (
      <div className="App">
        <header className="App-header">
          <Loader task={test()}/>
          <div className="App-content">
            <h1>Welcome to GitChain</h1>
          </div>
        </header>
      </div>
    );
}

Loader component

class Loader extends React.Component {
    constructor(props) {
      super(props);
      this.state = { loading: true };
    }

    componentDidMount(callback) {
      ;(async () => {
      await this.props.task
      this.setState({ loading: false });
      })();
    }

    render() {
      return (
        <div className={this.state.loading ? "sk-folding-cube" : "sk-folding-cube completed"}>
          <div className="sk-cube1 sk-cube"></div>
          <div className="sk-cube2 sk-cube"></div>
          <div className="sk-cube4 sk-cube"></div>
          <div className="sk-cube3 sk-cube"></div>
        </div>
      );
    }
  }

App.css

.App {
    text-align: center;
    font-family: -apple-system, BlinkMacSystemFont;
    font-weight: bold;
 }

.App-logo {
    animation: App-logo-spin infinite 20s linear;
    height: 40vmin;
    pointer-events: none;
}

.App-header {
    background-color: #060606;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    font-size: calc(10px + 2vmin);
    color: white;
}

.App-link {
    color: #61dafb;
}

@keyframes App-logo-spin {
    from {
      transform: rotate(0deg);
    }
    to {
      transform: rotate(360deg);
    }
}

.App-content {
    opacity: 0;
}

Answer №1

If you're looking to manipulate the rendering of App based on the completion of the loader task (as interpreted from "...and the app content to appear when the loader finishes."), you'll need to transfer the loading state management to the App component.

You can achieve this with the following implementation:

class App extends React.Component {
    constructor() {
      super();
      this.state = { loading: true };
      this.switchLoadingState = this.switchLoadingState.bind(this)
    }

    componentDidMount() {
        // This lifecycle method is specific to class components
        Secure()
    }

    switchLoadingState() {
        this.setState({ loading: !this.state.loading })
    }

    render() {
      const { loading } = this.state

      return (
          <div className="App">
              {loading && (
                  <header className="App-header">
                      <Loader task={test()} loading={loading} switchLoadingState={this.switchLoadingState} />
                      <div className="App-content">
                          <h1>Welcome to GitChain</h1>
                      </div>
                  </header>
              )}
          </div>
      );
    }

}

class Loader extends React.Component {
    constructor(props) {
      super(props);
    }

    componentDidMount(callback) {
      ;(async () => {
          await this.props.task
          this.props.switchLoadingState();
      })();
    }

    render() {
        const { loading } = this.props
        return (
            <div className={loading ? "sk-folding-cube" : "sk-folding-cube completed"}>
                <div className="sk-cube1 sk-cube"></div>
                <div className="sk-cube2 sk-cube"></div>
                <div className="sk-cube4 sk-cube"></div>
                <div className="sk-cube3 sk-cube"></div>
            </div>
        );
    }
}

Answer №2

It is possible to utilize the return of null within the render method in order to prevent anything from being rendered.

class Loader extends React.Component {
    constructor(props) {
      super(props);
      this.state = { loading: true };
    }

    componentDidMount(callback) {
      ;(async () => {
      await this.props.task
      this.setState({ loading: false });
      })();
    }

    render() {

      if (!this.state.loading) {
        return null;
      }

      return (
        <div className={this.state.loading ? "sk-folding-cube" : "sk-folding-cube completed"}>
          <div className="sk-cube1 sk-cube"></div>
          <div className="sk-cube2 sk-cube"></div>
          <div className="sk-cube4 sk-cube"></div>
          <div className="sk-cube3 sk-cube"></div>
        </div>
      );
    }
  }

Answer №3

To ensure that your Loader component is only displayed under certain conditions, consider enclosing the entire component within a conditional statement like the one below:

{this.state.loading && <Loader task={test()}/>}

With this setup, the loader component will only be visible if the this.state.loading state variable evaluates to true.

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