Understanding the Rendering Process

Hello, students! In the previous topic, we learned about importing and exporting modules.

In this class, we will learn about the rendering process in React.

Rendering is the process of creating the user interface for your React application.

The rendering process in React occurs in two steps:

1. Creation of the Component Tree
2. Rendering the Component Tree

Creation of the Component Tree

In the first step, React creates a component tree.

A component tree is a hierarchical structure of components.

Each component in the tree is responsible for rendering a part of the user interface.

The creation of the component tree is done by the render() method of a component.

For example, the following code creates a component tree with two components:

const App = () => {
  return (
    <div>
      <MyComponent />
      <MyOtherComponent />
    </div>
  );
};

class MyComponent extends React.Component {
  render() {
    return <h1>My component</h1>;
  }
}

class MyOtherComponent extends React.Component {
  render() {
    return <p>My other component</p>;
  }
}

This code creates two components, MyComponent and MyOtherComponent.

The App component renders these two components in the component tree.

Rendering the Component Tree

In the second step, React renders the component tree.

Rendering the component tree is done by the render() method of the main component.

In the previous example, the App component is the main component.

The render() method of the main component is called by the browser.

When the render() method of the main component is called, React traverses the component tree and renders each component.

Rendering a component includes creating the corresponding DOM element for the component and adding the DOM element to the browser’s DOM.

For example, the following code renders the component tree created in the previous example:

const App = () => {
  return (
    <div>
      <MyComponent />
      <MyOtherComponent />
    </div>
  );
};

class MyComponent extends React.Component {
  render() {
    return <h1>My component</h1>;
  }
}

class MyOtherComponent extends React.Component {
  render() {
    return <p>My other component</p>;
  }
}

This code renders a header and a paragraph in the browser.

The header is rendered by the MyComponent component, and the paragraph is rendered by the MyOtherComponent component.

Conclusion

In today’s topic, we learned about the rendering process in React.

The rendering process in React occurs in two steps: creation of the component tree and rendering of the component tree.

The creation of the component tree is done by the render() method of a component.

The rendering of the component tree is done by the render() method of the main component.

I hope you’ve understood the rendering process in React.

Now let’s move on to the next class.