react-img-lazy

React Image Lazy Load ImageLoader

Installation

# Yarn
$ yarn add react-img-lazy

# NPM
$ npm i --save react-img-lazy

Example of lazy load images: https://codesandbox.io/s/react-img-lazy-h8p9v

ImageLoader usage

import React from 'react';
import { ImageLoader } from 'react-img-lazy';

const MyImage = () => (
  <ImageLoader
          width={"420px"}
          height={"420px"}
          rootMargin={"10px"}
          src={"https://source.unsplash.com/random/200x200"}
          postVisible={() => {
            console.log("img container visible");
          }}
          postImgLoaded={() => {
            console.log("img loaded");
          }}
        />
);

export default MyImage;

Props

Prop	Type	Default	Description
src	String		Image url
width	String	auto	Width of the image to provide, default is auto
height	String	auto	Height of the image to provide, default is auto
postVisible	Function		Function called right after the placeholder comes in the view port
postImgLoaded	Function		Function called right after the actual image is loaded
placeholderSrc	String		Image src to display while the image is not visible or loaded.
root	Element	null(which is browser view port)	The element that is used as the viewport for checking visibility of the target. Must be the ancestor of the target. Defaults to the browser viewport if not specified or if null
rootMargin	String	100px	Margin around the root. Can have values similar to the CSS margin property, e.g. "10px 20px 30px 40px" (top, right, bottom, left). The values can be percentages. This set of values serves to grow or shrink each side of the root element's bounding box before computing intersections. Defaults to all zeros
threshold	Number	0	Either a single number or an array of numbers which indicate at what percentage of the target's visibility the observer's callback should be executed. If you only want to detect when visibility passes the 50% mark, you can use a value of 0.5. If you want the callback to run every time visibility passes another 25%, you would specify the array [0, 0.25, 0.5, 0.75, 1]. The default is 0 (meaning as soon as even one pixel is visible, the callback will be run). A value of 1.0 means that the threshold isn't considered passed until every pixel is visible
wrapperClassName	String		Using this prop wrapper class name can be set
alt	String	image	Set alt tag of the image