opti-image

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A Vue.js component for handling performant images without the headache. (lazy loading, webp, etc)

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# Opti-Image
A Vue.js component for handling performant images without the headache.
* Webp's with fallbacks for unsupported browsers (even in srcset)
* Lazy loading out of the box (uses Intersection Observer)
* Set standard srcset once in plugin options and it automatically applies to all opti-image components
* Space reserved according to aspect ratio to prevent page jumping upon image load
* Renders just a plain old img tag, no wrappers, for a drop in replacement for your current img's
* Built in support for [placeholder.com](https://placeholder.com/?ref=opti-image) for handy placeholder images during development
* Works with Nuxt.js (SSR)

## Installation
```
npm i opti-image --save
```

#### Global Use
```
//Main.js or similar
import OptiImagePlugin from 'opti-image'
Vue.use(OptiImagePlugin, {
    sizes: [1024, 768, 400]
})
```
#### Use In One Component
```
<script>
import { OptiImage } from 'opti-image'
export default {
    components: {OptiImage}
}
</script> 
```

## Demo
See opti-image in action at [danielkelly.io](https://danielkelly.io?utm_medium=opti-image). 
* Open site in Chrome to see `webp`'s and in Safari to see automatic `jpg` fallbacks.
* Lazy load and custom animations on image load used.

## Getting Started

```
<template>
    // NOTE: All of the below automatically have srcset if sizes set in plugin options
    
    
    <opti-image src="my-image.webp" />
    
    
    <opti-image src="my-image.webp" fallback="png" />
     
    
    <opti-image src="my-image.webp" fallback="completely/different/image.jpg" />
    
    
    <opti-image src="my-image.webp" :lazy="false" />
    
    
    <opti-image width="500" height="350" />
    
    
    <opti-image/>  
    
    
    <opti-image src="my-image.webp"  :responsive="false" />

</template>
```

## Props
| prop | Description | Type | Default | Notes |
|------------|------------------------------------------------------------------------------|---------|---------|-------------------------------------------------------------------------------------------------------------------------------|
| src | path to the image | String | "" | If it ends in .webp opti-image will automatically look for a .jpg in the same filepath for browsers that don't support .webp |
| fallback | defines what image should be used in browsers where webp isn't supported | String | "jpg" | extension only (no dot) = image in same location just different extension or provide a full path |
| lazy | whether or not the image should be lazy loaded | Boolean | true |  |
| responsive | whether or not the image should scale and always fit within parent container | Boolean | true | Aspect ratio determined by width/height properties will still be maintained while image is loading |
| width | width of the image | Integer | null | width and height must be provided to reserve space for the image |
| height | height of the image | Integer | null | when set to responsive, width and height work more to determine aspect ratio than to be a hard and fast width and height |
| webp | force webp image even if src does not have webp extension | Boolean | false | helpful when used with webpack loaders |
| disable-placeholder | don't do the placeholders | Boolean | false | let's the browser show the classic broken image icon instead |

## Animating Image in On Load
```
.opti-image {
  opacity: 1;
  transition: 0.5s ease opacity;
}
.opti-image-before-load {
  opacity: 0;
}
```

## Helpful Classes
* `opti-image` - static class on all <opti-image> images
* `opti-image-before-load` - class exists before image is loaded
* `opti-image-loaded` - class exists as soon as image loads
* `opti-image-load-error` - class exists when browser has issue loading image
* `opti-image-responsive` - class exists when prop responsive is true

**Important** Note that while opti-image takes away the pain of serving webp's it doesn't do anything to generate them! The webp's and their fallbacks must already exist. Bring your own webpack loaders to the table to accomplish this.

#### All feedback and pull requests welcome!

#### MIT License [https://opensource.org/licenses/MIT]

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