What does classList mean in JavaScript?

JavaScript classList is a DOM property of JavaScript that allows for styling the CSS (Cascading Style Sheet) classes of an element. JavaScript classList is a read-only property that returns the names of the CSS classes.

How do I add a classList to querySelectorAll?

To add a class to multiple elements:

  1. Select the elements using the document. querySelectorAll() method.
  2. Use a for…of loop to iterate over the collection of elements.
  3. Use the classList. add method to add a class to each element.

What does classList toggle do in JavaScript?

The classList. toggle() method supports adding and removing CSS classes whether they exist or not in your array with shorter lines of code.

How do you know if an element has a classList?

To check if an element contains a class, you use the contains() method of the classList property of the element:

  1. element.classList.contains(className);
  2. const div = document.querySelector(‘div’); div.classList.contains(‘secondary’); // true.

What is a classList?

Noun. 1. class list – a list issued by examiners that categorizes students according to the class of honours they achieved in their degree examinations. honours list. list, listing – a database containing an ordered array of items (names or topics)

What is querySelector in JS?

The querySelector() is a method of the Element interface. The querySelector() method allows you to select the first element that matches one or more CSS selectors. The following illustrates the syntax of the querySelector() method: let element = parentNode.querySelector(selector); Code language: JavaScript (javascript)

What is the difference between querySelector and querySelectorAll?

Differences: As seen above, querySelector() methodcan only be used to access a single element while querySelectorAll() method can be used to access all elements which match with a specified CSS selector. To return all matches, querySelectorAll has to be used, while to return a single match, querySelector is used.

How do I use querySelector with data attribute?

Use the querySelector method to get an element by data attribute, e.g. document. querySelector(‘[data-id=”box1″]’) . The querySelector method returns the first element that matches the provided selector or null if no element matches the selector in the document.

What is the difference between classList and className?

Using “classList”, you can add or remove a class without affecting any others the element may have. But if you assign “className”, it will wipe out any existing classes while adding the new one (or if you assign an empty string it will wipe out all of them).

How do you add multiple classes to a classList?

classList property To add multiple classes, you’ll need to pass each class as a separate parameter to the add method. The same goes if you want to remove multiple classes. You can utilize the spread syntax if you’re willing to store and manipulate your classes in an array.

Is classList one or two words?

Definition of ‘class list’

How do you use querySelector?

Definition and Usage The querySelector() method returns the first child element that matches a specified CSS selector(s) of an element. Note: The querySelector() method only returns the first element that matches the specified selectors. To return all the matches, use the querySelectorAll() method instead.