js
cssMediaQuery.js
// Retrieve all computed styles from the root HTML element (:root)
const rootStyles = getComputedStyle(document.documentElement);
// Get the value of the CSS variable --Breakpoint.
// Use a fallback (e.g., 768px) if the variable is not defined.
const breakpoint = rootStyles.getPropertyValue('--Breakpoint').trim() || '768px';
// Create a MediaQueryList based on the breakpoint value
const mediaQuery = window.matchMedia(`(min-width: ${breakpoint})`);
// Function that runs when the viewport is at or above the breakpoint
function handleDesktopLayout() {
console.log("Viewport is at or above the breakpoint.");
}
// Function that runs when the viewport drops below the breakpoint
function handleMobileLayout() {
console.log("Viewport is below the breakpoint.");
}
// Early return for the initial state:
// If the viewport does NOT meet the breakpoint requirement, run mobile logic and exit
if (!mediaQuery.matches) {
handleMobileLayout();
// No desktop logic needed at this point
} else {
handleDesktopLayout();
}
// Listen for changes in viewport size relative to the breakpoint
mediaQuery.addEventListener('change', (event) => {
if (event.matches) {
// The viewport just became equal to or larger than the breakpoint
handleDesktopLayout();
} else {
// The viewport just became smaller than the breakpoint
handleMobileLayout();
}
});
26.02.2026 | Holger Weischenberg
Using CSS media queries and CSS variables in JavaScript
formDataManipulation.js
// Modifies form data on submit.
form.addEventListener("formdata", (e) => {
const formData = e.formData;
geoLocationFieldNames.forEach((name) => {
formData.delete(name);
});
});
29.01.2026 | Peter Gerken
Manipulate Form Data before Submit
open_details.js
let details = document.getElementsByTagName('details');
for (i = 0; i < details.length; ++i) {
details.item(i).open = true;
}
13.11.2025 | Peter Gerken
Open all HTML details elements via browser console
pianoanalytics.js
// Return early if the piano-analytics library is unavailable.
if (typeof pa === "undefined") {
return;
}
Uses new Drupal "once" Library without using JQuery (see: https://www.drupal.org/node/3158256).
content-carousel.js
slick.on('breakpoint', function (e, _) {
if (settings.isLayoutBuilder) {
once.remove('ajax', '.use-ajax', _.$slideTrack[0]);
Drupal.ajax.bindAjaxLinks(_.$slideTrack[0]);
}
});
13.04.2026 | Pascal Crott
Restore AJAX functionality when using Slick Slider and Layout Builder
getObjectFromDataByKeyValue.js
/**
* Loads an object from another object by value of a certain key.
*
* @usage
* data = [
* 'foo': {
* 'id' => 5,
* 'label' => 'Foo'
* },
* 'bar': {
* 'id' => 6,
* 'label' => 'Bar'
* }
* ]
* foo = getObjectFromDataByKeyValue('id', 5, data)
*
* @param key
* The key we are comparing our value with.
* @param value
* The value the key should have.
* @param data
* The data you want to search in.
* @returns {unknown}
*/
function getObjectFromDataByKeyValue(key, value, data) {
return Object.values(data).find(o => o[key] === value)
}
18.06.2024 | Pascal Crott