react-simple-image

react-simple-image is a React Components of <img> tag with cleaner srcset/sizes interface.

Install

npm install --save react-simple-image

or,

yarn add react-simple-image

Usage

The <Image></Image> component has two descriptor type:

alt - String : (Required) alt text
className - String : (Optional) additional className
src - String : (Required) src attribute
srcSet - Object : (Required) src set
- key: descriptor - Regexp: width descriptor (e.g. 360w, 720w) or pixel descriptor (e.g. 1x, 1.5x, or 2x)
- value: src - String: image paths/urls
sizes - Array : (Optional) sizez set for width descriptor
- Object
  - size - String: image size
  - mediaCondition - String: to apply on the image size

Here are some tips:

As the HTML5 standard specifications says, sizes is not compatible with pixel descriptor. If you specify sizes with pixel descriptor, it is gracefully ignored.
width descriptor and pixel descriptor are not intended to use at the same time. If you declare both props, pixel descriptor overwrites and width descriptor props is ignored

For more information, please reach out for:

http://w3c.github.io/html/semantics-embedded-content.html#element-attrdef-img-srcset

React Component

<Image
  alt='example'
  className='additional-className'
  src='example-small.png'
  srcSet={{
    '360w': 'example-small.png',
    '720w': 'example-middle.png',
    '1200w': 'example-large.png',
  }}
  sizes={[
    {size: '100vw', mediaCondition: '(max-width: 30em)'},
    {size: '50vw', mediaCondition: '(max-width: 50em)'},
    {size: 'calc(33vw - 100px)'},
  ]}
></Image>

Example

width descriptor

React Component

<Image
  alt='example'
  src='example-small.png'
  srcSet={{
    '360w': 'example-small.png',
    '720w': 'example-middle.png',
    '1200w': 'example-large.png',
  }}
  sizes={[
    {size: '100vw', mediaCondition: '(max-width: 30em)'},
    {size: '50vw', mediaCondition: '(max-width: 50em)'},
    {size: 'calc(33vw - 100px)'},
  ]}
></Image>

Rendered HTML

<img
  alt="example"
  src="example-small.png"
  srcset="example-small.png 360w,example-middle.png 720w,example-large.png 1200w"
  sizes="(max-width: 30em) 100vw,(max-width: 50em) 50vw,calc(33vw - 100px)"
  data-reactroot=""
  data-reactid="1"
  data-react-checksum="1197296813"
/>

pixel descriptor

React Component

<Image
  alt='example'
  className='additional-className'
  src='example.png'
  srcSet={{
    '1x': 'example.png',
    '2x': 'example@2x.png',
  }}
></Image>

Rendered HTML

<img
  alt="example"
  class="additional-className"
  src="example.png"
  srcset="example.png 1x,example@2x.png 2x"
  data-reactroot=""
  data-reactid="1"
  data-react-checksum="1897738717"
/>

License

Licensed under the Apache License, Version 2.0 (the “License”);
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an “AS IS” BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.