DOM Selectors for Multiple Elements

The video tutorial covers various methods to select multiple elements in the DOM using JavaScript. It explains the use of getElementsByClassName and getElementsByTagName, highlighting their similarities and differences. The tutorial also demonstrates how to convert HTML collections into arrays to utilize array methods. Additionally, it introduces querySelectorAll, which returns a node list, allowing for more flexible operations without conversion. The video concludes with examples of styling elements using these selectors and iterating over them with loops.

What is a key difference between an HTML collection and a node list?

• HTML collections can be directly manipulated with array methods.

• Node lists include text nodes, while HTML collections do not.

• Node lists cannot be converted to arrays.

• HTML collections are always empty.

Which method would you use to select elements by their class name?

• getElementsByTagName

• querySelectorAll

• getElementsByClassName

• getElementById

How can you access the first element in an HTML collection?

• By calling 'firstElementChild'

• Using the 'first' method

• Using the 'getFirst' method

• By accessing the index 0

What is the primary use of 'getElementsByTagName'?

• To select elements by their class name

• To select elements by their tag name

• To select elements by their attribute

• To select elements by their ID

Which of the following is true about HTML collections?

• They need to be converted to arrays to use array methods.

• They include text nodes.

• They can be directly reversed using the 'reverse' method.

• They are arrays by default.

How can you convert an HTML collection to an array?

• Using the 'toArray' method

• By using 'Array.from()'

• By using 'convertToArray()'

• Using the 'arrayify' method

What does 'querySelectorAll' return?

• An HTML collection

• A single element

• A node list

• A string

Which method allows the use of CSS selectors to select elements?

• querySelectorAll

• getElementsByTagName

• getElementById

• getElementsByClassName

What is a benefit of using 'querySelectorAll' over 'getElementsByClassName'?

• It only selects the first matching element.

• It allows for more complex CSS selectors.

• It returns an HTML collection.

• It is faster in execution.

How can you style every odd element in a list using 'querySelectorAll'?

• By using ':nth-of-type(odd)'

• By using ':odd-child'

• By using ':odd'

• By using ':nth-child(odd)'