The Modern JavaScript Bootcamp (2019) - Advanced Queries

The video tutorial covers different methods for selecting elements in a document, starting with basic tag-based selection and moving to more advanced techniques using IDs and classes. It highlights the limitations of tag-based selection when dealing with multiple elements and demonstrates how to use querySelector and querySelectorAll effectively. The tutorial also explains the importance of using unique IDs for precise targeting and classes for grouping elements. Advanced query selector techniques are introduced, providing a comprehensive understanding of element selection in JavaScript.

What is a potential issue when selecting elements by tag name?

• It selects elements based on their color.

• It selects elements randomly.

• It only selects the last element.

• It only selects the first element.

What does querySelectorAll return?

• A single element

• An array of elements

• A string of element names

• A boolean value

Why is using IDs a better approach for selecting elements?

• IDs are automatically generated.

• IDs are unique to each element.

• IDs are more colorful.

• IDs are easier to remember.

What is the main difference between IDs and classes?

• IDs can be used multiple times, classes cannot.

• Classes are automatically assigned, IDs are not.

• Classes are unique, IDs are not.

• IDs are unique, classes can be shared.

How do you start a selector for a class in JavaScript?

• With a dollar sign ($)

• With an asterisk (*)

• With a dot (.)

• With a hash (#)

What is the purpose of using querySelectorAll with classes?

• To select elements with a specific ID

• To select elements with a specific tag

• To select all elements with a specific class

• To select a single element with a class

What happens if you switch the order of elements when using IDs for selection?

• The selection breaks.

• The selection targets the last element.

• The selection remains accurate.

• The selection becomes random.

What is a benefit of using classes over IDs?

• Classes are easier to remember.

• Classes are unique to each element.

• Classes can be applied to multiple elements.

• Classes are automatically generated.

How can you target an element with both a class and an ID?

• By using only the ID

• By using a random selection method

• By using only the class name

• By combining both class and ID in the selector

What is the first step in the challenge presented at the end of the video?

• Add a class to the button

• Change the button's text

• Add an ID to the button

• Remove the button