18.06.2024 | Pascal Crott

Load an object from another object by value of a certain key

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)
}

Issue:

You need to load an object by a value in a nested data structure, e.g. by its ID.

Solution:

Utilize the code snippet provided.

Weitere DevBits

26.02.2026 | Holger Weischenberg

Using CSS media queries and CSS variables in JavaScript

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();
    }
});
js
29.01.2026 | Peter Gerken

Manipulate Form Data before Submit

formDataManipulation.js
// Modifies form data on submit.
form.addEventListener("formdata", (e) => {
  const formData = e.formData;
  geoLocationFieldNames.forEach((name) => {
    formData.delete(name);
  });
});

js
manipulating forms
functional frontend