Coffeekraken-s-responsive-img-component NPM

Coffeekraken s-responsive-img-component

Provide a nice way to make images responsive without using srcset and sizes attributes.

Table of content

Install

npm install coffeekraken-s-responsive-img-component --save

Get Started

First, import the component into your javascript file like so:

import SResponsiveImgComponent from 'coffeekraken-s-responsive-img-component'

SResponsiveImgComponent.registerPreset('banner', {
  widths: [{
    width: 340,
    name: 'mobile',
    pixelRatios: [1,2]
  }, {
    width: 640,
    name: 'tablet',
    pixelRatios: [1,2]
  }, {
    width: 1280,
    name: 'desktop',
    pixelRatios: [1,2]
  }],
  computeSrc: (src, widthObj) => {
    return src + `?auto=compress&w={width}&fit=crop&fm=png&dpr={pixelRatio}`
  }
})

Then simply use it inside your html like so:

<img is="s-responsive-img" lazy-src="https://assets.imgix.net/hp/snowshoe.jpg" preset="banner" />

Preset properties

Here's the list of properties that the presets accept.

`widths`

This property is the main one. It's an array of width object. Make sure you enter the width objects in ascendant width order. Here's the supported width object properties:

width : Specify an image size available for this image.
name : A name for this image size.
pixelRatios : An array of available pixel ratios for this image
Any other key/value pairs you want that will be available in the computeSrc function

`computeSrc`

This property represent a function that will be called before applying the new image src. You will have access to the width object corresponding to the better size to apply. Here's the attributes that you will have:

src : The original image source taken from the original HTML
widthObj : The best suited width object for this image with all your custom key/pairs values

This function need to return the new image src to apply. Here's an example:

{
  widths: [{
    // widths here...
  }],
  computeSrc: (src, widthObj) => {
    // {width} is the same as ${widthObj.width}
    return src + `?auto=compress&w={width}&fit=crop&fm=png&dpr={pixelRatio}`
  }
}

If you set some "tokens" like {width} in the url, they will be replaced with the corresponding width object property.

Browsers support

IE / Edge	Firefox	Chrome	Safari
IE11+	last 2 versions	last 2 versions	last 2 versions

As browsers are automatically updated, we will keep as reference the last two versions of each but this component can work on older ones as well.
The webcomponent API (custom elements, shadowDOM, etc...) is not supported in some older browsers like IE10, etc... In order to make them work, you will need to integrate the corresponding polyfill.

Code linting

This package uses some code linting rules. Here's the list:

StandardJS for javascript files
Stylelint with stylelint-config-standard for scss files

Your commits will not been accepted if the code style is not respected!

Contribute

This is an open source project and will ever be! You are more that welcomed to contribute to his development and make it more awesome every day. To do so, you have several possibilities:

Who are Coffeekraken

We try to be some cool guys that build some cool tools to make our (and yours hopefully) every day life better.

License

The code is available under the MIT license. This mean that you can use, modify, or do whatever you want with it. This mean also that it is shipped to you for free, so don't be a hater and if you find some issues, etc... feel free to contribute instead of sharing your frustrations on social networks like an asshole...