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Informations about the package silverstripe-progressive-image

Progressive Image Loader for Silverstripe

Archiving soon

🪦 As all evergreen browsers now support the loading="lazy" attribute, no further feature updates will be made to this module.

We recommend uninstalling this module and replacing any progessive image variables with the standard Silverstripe equivalent in your project templates.

More: https://caniuse.com/loading-lazy-attr

Features

This module does progressive image loading using IntersectionObserver (v1).

Browser support for IntersectionObserver (currently all the important ones).

While the module does add loading="lazy" to img tags, this module provides a polyfill for browsers that don't yet support image lazy loading natively (tl;dr Safari).

Installation

The only supported method of installing this module is via composer

Usage

Call the thumbnail rendering methods directly within your template:

In place of

Requirements

When one of the $Progressive* methods is called, Requirements will automatically be added via the Requirements API, these are loaded via data: uris with SRI hashes supplied

Templates

How it works

A thumbnail with 10% of the width/height of the requested size and a quality of 1 will be created. This will be the main image to load.

The final image will be created using the requested size and quality (420x280 @ 80% quality in the ProgressiveFill example above)

When the page loads, the tiny, low quality image will display by default, once the image scrolls or appears in the viewport, the larger image will load, thanks to IntersectionObserver.

Notes

Supported thumbnailing methods:

Inline script and css removal

To support Content Security Policies (CSP), the controller extension loading inline scripts and css plus related templates have been removed.

Thanks

License

BSD-3-Clause

Maintainers

Bugtracker

We welcome bug reports, pull requests and feature requests on the Github Issue tracker for this project.

Please review the code of conduct prior to opening a new issue.

Security

If you have found a security issue with this module, please email digital[@]dpc.nsw.gov.au in the first instance, detailing your findings.

Development and contribution

If you would like to make contributions to the module please ensure you raise a pull request and discuss with the module maintainers.

Please review the code of conduct prior to completing a pull request.

All versions of silverstripe-progressive-image with dependencies

PHP Build Version
Package Version
Requires silverstripe/assets Version ^1.10
jonom/focuspoint Version ^3.1 | ^4
Composer command for our command line client (download client) This client runs in each environment. You don't need a specific PHP version etc. The first 20 API calls are free. Standard composer command

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