react-blur-lazy-image

lazy loading images in progressive way, loads image when its in user's viewport

Demo

http://rohitsharma.xyz/cdn/projects/react-blur-lazy-image/index.html

Features (1.x.x)

• allow loading images only when the image is in user's viewport
• fetches an image in background and then replaces blurred image (preview)
• Shows a placeholder images, preferrably blured (can be obtained by using extremely low resolution image) during the load
• Use of CSS transitions to make image replacement smooth.
• can be used in image slider (where large number of images used)

Installation

npm

npm install react-blur-lazy-image --save

yarn

yarn add react-blur-lazy-image

Usage

import React, { Component } from 'react';
import Image from 'react-blur-lazy-image';
import './../node_modules/react-blur-lazy-image/dist/index.css';

class App extends Component {
  constructor(props) {
    super(props);
    this.state = {};
  }
  componentDidMount() {
    const image1 = 'http://via.placeholder.com/3000x2000';
    const imageAlt1 = 'http://via.placeholder.com/6x4';
    const image2 = 'http://via.placeholder.com/4000x3000';
    const imageAlt2 = 'http://via.placeholder.com/8x6';
    this.setState({
      imageListV: [
        <Image src={image1} altSrc={imageAlt1} container={this.imageContainer1} style={{ width: '100%' }} />,
        <Image src={image2} altSrc={imageAlt2} container={this.imageContainer1} style={{ width: '100%' }} />,
        <Image src={image1} altSrc={imageAlt1} container={this.imageContainer1} style={{ width: '100%' }} />,
        <Image src={image2} altSrc={imageAlt2} container={this.imageContainer1} style={{ width: '100%' }} />,
        <Image src={image2} altSrc={imageAlt2} container={this.imageContainer1} style={{ width: '100%' }} />,
        <Image src={image1} altSrc={imageAlt1} container={this.imageContainer1} style={{ width: '100%' }} />,
        <Image src={image1} altSrc={imageAlt1} container={this.imageContainer1} style={{ width: '100%' }} />,
        <Image src={image2} altSrc={imageAlt2} container={this.imageContainer1} style={{ width: '100%' }} />,
      ],
      imageListH: [
        <Image src={image1} altSrc={imageAlt1} container={this.imageContainer2} style={{ height: '200px', border:'1px solid white' }} />,
        <Image src={image2} altSrc={imageAlt2} container={this.imageContainer2} style={{ height: '200px', border:'1px solid white' }} />,
        <Image src={image2} altSrc={imageAlt2} container={this.imageContainer2} style={{ height: '200px', border:'1px solid white' }} />,
        <Image src={image1} altSrc={imageAlt1} container={this.imageContainer2} style={{ height: '200px', border:'1px solid white' }} />,
        <Image src={image2} altSrc={imageAlt2} container={this.imageContainer2} style={{ height: '200px', border:'1px solid white' }} />,
        <Image src={image1} altSrc={imageAlt1} container={this.imageContainer2} style={{ height: '200px', border:'1px solid white' }} />,
        <Image src={image1} altSrc={imageAlt1} container={this.imageContainer2} style={{ height: '200px', border:'1px solid white' }} />,
        <Image src={image2} altSrc={imageAlt2} container={this.imageContainer2} style={{ height: '200px', border:'1px solid white' }} />,
      ],
    });
  }
  render() {
    return (
      <div className="App">
        <br />
        <div ref={(node) => { this.imageContainer1 = node; }} style={{ width: '400px', height: '250px', overflow: 'auto' }}>
          {this.state.imageListV}
        </div>
        <br />
        <div ref={(node) => { this.imageContainer2 = node; }} style={{ overflow: 'auto', whiteSpace: 'nowrap' }}>
          {this.state.imageListH}
        </div>
      </div >
    );
  }
}

export default App;

Prop Types

propTypes: {
  /**
   * source of original image
   */
  src: PropTypes.string.isRequired,
  
  /**
   * source of placeholder image
   */
  altSrc: PropTypes.string.isRequired,

  /**
   * alt attrs for image
   */
  alt: PropTypes.string,

  /**
   * style object for image
   */
  style: PropTypes.object,
  
  /**
   * class name for image
   */
  className: PropTypes.string,
  
  /**
   * attributes for <img> tag
   */
  htmlAttrs: PropTypes.object,
};

License

WTFPL Do What the Fuck You Want To Public License

Author

Rohit Sharma | rohit7209@rediffmail.com | rohitsharma.xyz