ReactJS Onsen UI LazyList Component

Last Updated : 07 Feb, 2023

ReactJS Onsen-UI is a popular front-end library with a set of React components that are designed to developing HTML5 hybrid and mobile web apps in a beautiful and efficient way. LazyList components are used when millions of items are to be rendered without a drop in performance. We can use the following approach in ReactJS to use the Onsen-UI LazyList Component.

LazyList Props:

modifier: It is used to denote the appearance of the lazy list.
length: It is used to denote the length of the list.
renderRow: It is a function that takes the index of the display row, renders it.
calculateItemHeight: It is a function that takes the index of the row, returns the height of it.

Creating 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 onsenui react-onsenui 
```

Project Structure: It will look like the following.

Project Structure

Example: Now write down the following code in the App.js file. Here, App is our default component where we have written our code.

App.js

import React from 'react'; 
import 'onsenui/css/onsen-css-components.css'; 
import { LazyList, Page, ListItem } from 'react-onsenui'; 
  
export default function App() { 
  
    return ( 
        <div style={{ 
            display: 'block', width: 500, paddingLeft: 30 
        }}> 
            <Page > 
                <div style={{ height: 100 }}> 
                    <h6>ReactJS Onsen-UI LazyList Component</h6> 
                    <LazyList 
                        length={5} 
                        renderRow={(index) => 
                            <ListItem modifier="material" key={index}> 
                                {'Sample Content: ' + index} 
                            </ListItem> 
                        } 
                        calculateItemHeight={() => 5} 
                    /> 
                </div> 
            </Page> 
        </div> 
    ); 
}