React-Bootstrap API Dropdown

React-bootstrap is a front-End Stylesheet library. It replaces the Bootstrap JavaScript into completely a react component. It creates a seamless front-end development experience.

In this article, we will see the React-Bootstrap API Dropdown. The dropdown components are generally created when we provide a list of items to choose from.

React-Bootstrap API Dropdown Props:

• bsPrefix: This changes the component's CSS base class name and modifier class names prefix.
• drop: It sets the direction and location of the menu with respect to its to it's Toggle.
• as: It helps to customize the element or to change the element type.
• show: It is a boolean value. It determines whether the Dropdown is visible or not.
• onToggle: It is a callback function which gets triggered when the Dropdown wishes to change visibility.
• onSelect: It is a callback function which gets triggered when a menu item is selected.
• focusFirstItemOnShow: It controls the the focus behavior for when the Dropdown is opened.
• autoClose: It determines the auto close behaviour of the dropdown.

Syntax:

<Dropdown>...</Dropdown>

Steps to create React Application And Installing Module:

Step 1: Create a React application using the following command:

npx create-react-app foldername

Step 2: After creating your project folder i.e. foldername, move to it using the following command:

cd foldername

Step 3: After creating the ReactJS application, Install the required module using the following command:

npm install react-bootstrap bootstrap

Project Structure: It will look like the following.

Example 1: In this example, we are using the "id" and "drop" props of dropdown API in App.js file

import Dropdown from 'react-bootstrap/Dropdown';
import 'bootstrap/dist/css/bootstrap.min.css';

function App() {

  return (
    <div className="App text-center">
      <h1 class="text-success">GeeksforGeeks</h1>
      <h3>React-Bootstrap API Dropdown</h3>
      <Dropdown drop='down-centered'>
        <Dropdown.Toggle id="articles" variant="success">
          Articles
        </Dropdown.Toggle>
        <Dropdown.Menu>
          <Dropdown.Item href="#/web-dev">Web Development</Dropdown.Item>
          <Dropdown.Item href="#/software-testing">Software Testing</Dropdown.Item>
          <Dropdown.Item href="#/python">Python</Dropdown.Item>
          <Dropdown.Item href="#/linux">Linux</Dropdown.Item>
        </Dropdown.Menu>
      </Dropdown>
    </div>
  );
}

export default App;

Step to Run Application: Run the application using the following command from the root directory of the project:

npm start

Output: Now open your browser and go to http://localhost:3000/, you will see the following output:

Example 2: In this example, we are creating a dropdown component by using the "align" and "autoClose" props in App.js file.

import Dropdown from 'react-bootstrap/Dropdown';
import 'bootstrap/dist/css/bootstrap.min.css';

function App() {

  return (
    <div className="App text-center">
      <h1 class="text-success">GeeksforGeeks</h1>
      <h3>React-Bootstrap API Dropdown</h3>
      <Dropdown align="start" autoClose="inside">
        <Dropdown.Toggle id="languages">
          Programming Languages
        </Dropdown.Toggle>
        <Dropdown.Menu>
          <Dropdown.Item href="#/java">Java</Dropdown.Item>
          <Dropdown.Item href="#/c++">C++</Dropdown.Item>
          <Dropdown.Item href="#/python">Python</Dropdown.Item>

        </Dropdown.Menu>
      </Dropdown>
    </div>
  );
}

export default App;

Output: