Responsive Containers

for a calendar block might look like this:

By adding that data-attribute and nothing more, your container will now be tagged with additional classes based on how big they appear:
– No special class if the container is below 420px (style for this narrow context as your default).
– container-sm if the container is 420px wide or more,
– container-md if it is wider than 600px,
– container-lg if it is wider than 720px, and
– container-xl for any element 960px or wider.

These are default values and therefore somewhat arbitrary, so you may also provide your own custom theme- or plugin-specific breakpoint values using the data-responsive-container attribute. When rendering your element or block in PHP, pass an array of class names and the minimum width at which each class should be applied. These class names can be generic like the default .container-* classes, or they may be specific to the element being styled:

echo sprintf(
  '
',
  esc_attr( wp_json_encode( [
    'myblock--2-column' => 600,
    'myblock--3-column' => 900,
  ] )
);

In this example your container would receive the .myblock--2-column class from 600px up, and .myblock--3-column at or above 900px.

Note that in this case the .myblock element receives no custom class below 600px. We don’t apply any class names below your specified minimum because we assume styles are written narrow-context-first, but you may ensure your smallest class is always applied by providing a minimum width of 0:

echo sprintf(
  '
',
  esc_attr( wp_json_encode( [
    'myblock--1-column' => 0, // Will apply in all circumstances.
    'myblock--2-column' => 600,
    'myblock--3-column' => 900,
  ] )
);

From within WordPress

1. Visit ‘Plugins > Add New’
2. Search for ‘Responsive Containers’
3. Activate the Responsive Containers plugin from your Plugins page.
4. Start using data-responsive-container attributes within your theme or plugin.

Manually

1. Upload the responsive-containers folder to the /wp-content/plugins/ directory
2. Activate the Responsive Containers plugin from your Plugins page.
3. Start using data-responsive-container attributes within your theme or plugin.

License & Attribution

This plugin is licensed under the terms of the GNU General Public License (or “GPL”). It is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version.

It was created by K. Adam White at Human Made, based on a concept popularized by Philip Walton.

This plugin utilizes the resize-observer-polyfill library by Denis Rul, released under the MIT license and © 2016 Denis Rul.