PICTURE (Veams Components )
src/app/shared/components/picture/templates
Demo Section
Each variation will be presented in the following section.
Readme
Picture
Description
Include responsive (content) images. It supports lazy loading (when provided in your JavaScript) and uses a custom getUrl helper to print out the relative path or URL.
Installation
Installation with Veams
veams install vc picture
Fields
picture.hbs
Settings
| Parameter | Type | Default | Description |
|---|---|---|---|
| settings.pictureClasses | String | '' |
Modifier classes for component |
| settings.pictureContextClass | String | 'default' |
Context class of component (slider-head: Bildeinstellungen für den Slider im Modul Stage (Landingpagebühne) ; slider-starthead: Bildeinstellungen für den Slider im Modul Stage.frontpage (Startseitenbühne); slider-lpage: Bildeinstellungen für den Slider in einer Landingpage im Content im Modul slider; timeline-lpage: Bildeinstellungen für die Timeline in einer Landingpage im Content im Modul timeline; slider: Bildeinstellungen für den Slider in einer Detailseite (rte) im Content im Modul slider; timeline: Bildeinstellungen für die Timeline in einer Detailseite (rte) im Content im Modul timeline ) |
| settings.lazyload | Boolean | false |
Use lazyload for images |
Content
| Parameter | Type | Description |
|---|---|---|
| content.fallback | String | Path to fallback image, e.g. “https://placehold.co/400x200” - mostly the smallest image defined in srcset |
| content.alt | String | An alternative text describing the image if a user for some reason cannot view it |
| content.items | Array | An array containing different image sources |
The images should differ in type or in picture detail, otherwise there’s no need to add more than one child object. Each item will generate a <source> element
| Parameter | Type | Description |
|---|---|---|
| content.items.type | String | If the browser supports the format described in the type attribute, it uses that source; otherwise, the <source> element is skipped |
Example: “image/webp”. Use type attribute only if you provide new file formats like webp, jx2, jp2, apng, etc
| Parameter | Type | Description |
|---|---|---|
| content.items.media | String | If a query in a media attribute evaluates to true, the browser must use that source; otherwise, the <source> element is skipped |
Example: “(min-width: 200px)”. Use media attribute only for art direction use case
| Parameter | Type | Description |
|---|---|---|
| content.items.srcset | Array | Use srcset to provide different image sizes. Contains 1-x children |
| content.items.srcset.src | String | Path to image, e.g. https://placehold.co/400x200 |
| content.items.srcset.imageWidth | String | The width in physical pixels (e.g. 400w) of image referenced in src above |
| Parameter | Type | Description |
|---|---|---|
| content.items.sizes | Array | Use sizes to define the width of our images at a given screen size |
The media queries could reflect the breakpoints in your project, but it’s not mandatory to stick to them. If the width of an image in the srcset attribute is set (= imageWidth), the sizes attribute must be present.
| Parameter | Type | Description |
|---|---|---|
| content.items.sizes.screenWidth | String | Media query (e.g. (min-width: 992px)) defining which image to use |
| content.items.sizes.imageWidth | String | Width of image in viewport matching the media query defined in “screenWidth”. Use width in pixel, e.g. 960px or as a dynamic width, e.g. calc(100vw - 50px) |
Contributors
Thanks for assistance and contributions:
Templates
picture.hbs
<picture class="c-picture{{#if settings.pictureContextClass}}--{{settings.pictureContextClass}}{{else}}--default{{/if}}
{{#if settings.pictureClasses}} {{settings.pictureClasses}}{{/if}}{{#if settings.lazyload}} lazyload{{/if}}"
data-css="c-picture" {{#if settings.pictureJsItem}} data-js-item='{{settings.pictureJsItem}}'{{/if}}>
<!--[if IE 9]><audio><![endif]-->
{{#each content.items}}
<source {{#if ../settings.lazyload}} data-{{/if}}srcset="{{#each srcset}}{{#unless @first}}, {{/unless}}
{{getUrl src}} {{#if imageWidth}} {{imageWidth}} {{/if}} {{/each}}"
{{#if sizes}} sizes=" {{#each sizes}}
{{#unless @first}} , {{/unless}} {{screenWidth}} {{imageWidth}} {{/each}}"{{/if}}
{{#if media}} media=" {{media}}"{{/if}}
{{#if type}} type="
{{type}}"{{/if}} />
{{/each}}
<!--[if IE 9]></audio><![endif]-->
{{#if content.fallbackSrc}}
<img class="
picture__image{{#if settings.lazyload}} lazyload{{/if}}" src="{{getUrl content.fallbackSrc}}" alt="{{content.alt}}"
title="{{content.alt}}" {{#if settings.autoSizes}} data-sizes="auto" {{/if}} {{#if settings.ariaDescribedBy}} aria-describedby="{{settings.ariaDescribedBy}}"
{{/if}} />
{{else}}
<h3 style="color: red; font-weight: bold;">Define a fallback picture!</h3>
{{/if}}
</picture>
Data File
picture-bp.hjson
{
"title": "Picture",
"variations": {
"default": {
"docs": {
"variationName": "Picture with Sizes",
"center": true
},
"settings": {
"pictureContextClass": "default",
"pictureClasses": false,
"lazyload": false,
"autoSizes": true
},
"content": {
"fallbackSrc": "https://placehold.co/400x200",
"alt": "Alternative text that describes the image",
"items": [
{
"srcset": [
{
"src": "https://placehold.co/400x300",
"imageWidth": "400w"
},
{
"src": "https://placehold.co/800x600",
"imageWidth": "800w"
},
{
"src": "https://placehold.co/1200x900",
"imageWidth": "1200w"
},
{
"src": "https://placehold.co/1600x1200",
"imageWidth": "1600w"
},
{
"src": "https://placehold.co/2000x1500",
"imageWidth": "2000w"
},
{
"src": "https://placehold.co/2400x1800",
"imageWidth": "2400w"
},
{
"src": "https://placehold.co/2800x2100",
"imageWidth": "2800w"
},
{
"src": "https://placehold.co/3200x2400",
"imageWidth": "3200w"
}
],
"sizes": [
{
"screenWidth": "(min-width: 992px)",
"imageWidth": "1440px"
},
{
"screenWidth": "(min-width: 768px)",
"imageWidth": "calc( 100vw - 50px )"
}
]
}
]
}
},
"lazyload": {
"docs": {
"variationName": "Picture with Lazyload",
"center": true
},
"settings": {
"pictureContextClass": "default",
"pictureClasses": false,
"lazyload": true,
"autoSizes": true
},
"content": {
"fallbackSrc": "https://placehold.co/40x10",
"alt": "Alternative text that describes the image",
"items": [
{
"srcset": [
{
"src": "https://placehold.co/400x300",
"imageWidth": "400w"
},
{
"src": "https://placehold.co/800x600",
"imageWidth": "800w"
},
{
"src": "https://placehold.co/1200x900",
"imageWidth": "1200w"
},
{
"src": "https://placehold.co/1600x1200",
"imageWidth": "1600w"
},
{
"src": "https://placehold.co/2000x1500",
"imageWidth": "2000w"
},
{
"src": "https://placehold.co/2400x1800",
"imageWidth": "2400w"
},
{
"src": "https://placehold.co/2800x2100",
"imageWidth": "2800w"
},
{
"src": "https://placehold.co/3200x2400",
"imageWidth": "3200w"
}
]
}
]
}
}
}
}
Styles
styles/_picture.scss
HTML Output
Picture with Sizes
<picture class="c-picture--default
" data-css="c-picture">
<!--[if IE 9]><audio><![endif]-->
<source srcset="
https://placehold.co/400x300 400w ,
https://placehold.co/800x600 800w ,
https://placehold.co/1200x900 1200w ,
https://placehold.co/1600x1200 1600w ,
https://placehold.co/2000x1500 2000w ,
https://placehold.co/2400x1800 2400w ,
https://placehold.co/2800x2100 2800w ,
https://placehold.co/3200x2400 3200w " sizes="
(min-width: 992px) 1440px
, (min-width: 768px) calc( 100vw - 50px ) " />
<!--[if IE 9]></audio><![endif]-->
<img class="
picture__image" src="https://placehold.co/400x200" alt="Alternative text that describes the image" title="Alternative text that describes the image" data-sizes="auto" />
</picture>Picture with Lazyload
<picture class="c-picture--default
lazyload" data-css="c-picture">
<!--[if IE 9]><audio><![endif]-->
<source data-srcset="
https://placehold.co/400x300 400w ,
https://placehold.co/800x600 800w ,
https://placehold.co/1200x900 1200w ,
https://placehold.co/1600x1200 1600w ,
https://placehold.co/2000x1500 2000w ,
https://placehold.co/2400x1800 2400w ,
https://placehold.co/2800x2100 2800w ,
https://placehold.co/3200x2400 3200w " />
<!--[if IE 9]></audio><![endif]-->
<img class="
picture__image lazyload" src="https://placehold.co/40x10" alt="Alternative text that describes the image" title="Alternative text that describes the image" data-sizes="auto" />
</picture>