README

The Plugin provides a helper to create html <picture> elements in Silverstripe templates. It supports WebP sources out of the box.

Requirements

• SilverStripe 5.x
• rosell-dk/webp-convert ^2.9
• PHP >= 8.1

Install

Install via composer.

composer require jbennecker/silverstripe-webp

Register the plugin as a data extension for the Assets\Image class:

SilverStripe\Assets\Image:
    extensions:
        - jbennecker\Webp\WebpExtension

Usage

The jbennecker\Webp\Picture class provides a flexible Api to manipulate your picture in your template file.

To access the Api, call the getPicture() method from the WebpExtension like so:

$MyImage.Picture

This will be enough to output a <picture> with standard configuration.

Api methods

The class provides multiple methods that can be called in any order. You can chain the methods, as they return the instance of the Picture class.

setWidths(int ...$widths)

The method will set the widths in the srcset attribute in each of the picture's <source> tags.

Example:

$MyImage.Picture.setWidths(150, 230, 550)

Defaults to 350, 750, 1500.

setSizes(string $sizes)

Set the sizes attribute on the <source> tags a media-query. Defaults to 100w.

$MyImage.Picture.setWidths(370, 750, 1920).setSizes("(min-width: 280px) 100vw, (min-width: 640px) 50vw")

setFormats(string ...$formats)

Control what <source> tags / formats will be present. Defaults to webp and jpeg.

Available options:

• webp
• jpg/jpeg

To e.g. disable webp and only get one <source> with a jpg srcset:

$MyImage.Picture.setFormats('jpg')

setAlt(string $value)

Sets the alt parameter on the <img> tag. Defaults to the Image's title from the CMS.

setCss(string $value)

Sets the class parameter on the <img> tag.

setWidth(int $width)

Set the width attribute on the <img> tag. Defaults to the Image's original width.

setHeight(int $height)

Set the height attribute on the <img> tag. Defaults to the Image's original height.

setParam(string $param, string $value)

Sets a parameter with the name $param on the <img> tag.

$MyImage.Picture.setClass("w-full border shadow-lg").setParam("title", "This is a title")

setLazyLoading($lazy = true)

Control the loading attribute. Sets it to lazy or eager. Defaults to lazy loading.

The Webp-Method

If you just want to quickly convert the image to .webp and use it in your template, you can use the Webp method:

<img src="$MyImage.Webp(900)" alt="">