Modifying CSS class attributes with JavaScript

I am looking for a way to dynamically change the value of an attribute in a CSS class.

Here is my situation:

I have multiple elements that are all using the same class. Instead of individually selecting and applying styles to each one, I want to alter a specific attribute within the class that is already being used. For example:

.prodName {
  max-width: 270px;
  display: block;
}

This class is applied to many elements, and I would like to modify one of its attributes like so:

.prodName {
  max-width: 350px <---
  display: block;
}

Is there a simple method to achieve this using JavaScript?

I have already searched for a solution before posting this question, but haven't found anything straightforward and helpful. Thank you in advance for any assistance provided.

Answer №1

To achieve this, utilizing CSS variables is a good approach.

const root = document.querySelector(':root');

function adjustSize() {
  root.style.setProperty('--size', '300px');
}
:root {
  --size: 100px;
}

.container {
  background-color: red;
  width: var(--size);
  height: var(--size);
  cursor: pointer;
}
<div class="container" onclick="adjustSize()"></div>

The downside of this method is limited support in older web browsers. To overcome this issue for browsers like IE that do not support CSS variables, you can apply a class to the body or parent container.

function adjustSize() {
  document.body.classList.add('enlarged')
}
.container {
  background-color: red;
  width: 100px;
  height: 100px;
  cursor: pointer;
}

.enlarged .container {
  width: 300px;
  height: 300px;
}
<div class="container" onclick="adjustSize()"></div>

Answer №2

Integrate a fresh CSS class:

.newClass {
  font-size: 16px;
}

Next, assign the new class to the element using JavaScript:

document.querySelector('.elementName').className += ' newClass'; // <-- It's recommended to use unique IDs for selection, such as '#uniqueID'

Answer №3

When managing the alteration of CSS classes or attributes from TypeScript, consider using ngClass for more control and flexibility. Check out this helpful example to see how it can be implemented: https://www.freecodecamp.org/news/angular-ngclass-example/. This approach allows you to centralize all your logic in one place for easy access.

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