Podcast
Questions and Answers
Which of the following is NOT a feature of JavaScript?
Which of the following is NOT a feature of JavaScript?
- It is a compiled language. (correct)
- It is loosely typed.
- It supports object-oriented programming.
- It is a dynamic language.
What is the recommended placement for JavaScript code in an HTML document?
What is the recommended placement for JavaScript code in an HTML document?
- It doesn't matter where it is placed.
- Inside the `<head>` tag.
- At the beginning of the `<body>` tag.
- At the end of the `<body>` tag. (correct)
Which JavaScript method returns a reference to the HTML element with the ID 'xpto'?
Which JavaScript method returns a reference to the HTML element with the ID 'xpto'?
- document.getElementsByClassName('xpto')
- document.getElementById('xpto') (correct)
- document.getElementsByTagName('xpto')
- document.querySelector('#xpto')
What is the purpose of the 'src' attribute in a <script> tag?
What is the purpose of the 'src' attribute in a <script> tag?
Which JavaScript method would you use to retrieve a list of all elements with the class name 'example'?
Which JavaScript method would you use to retrieve a list of all elements with the class name 'example'?
Which of the following is a valid reason why JavaScript is considered loosely typed?
Which of the following is a valid reason why JavaScript is considered loosely typed?
Which JavaScript method returns the first element that matches a provided CSS selector?
Which JavaScript method returns the first element that matches a provided CSS selector?
The statement that JavaScript is a multi-paradigm language implies that it supports:
The statement that JavaScript is a multi-paradigm language implies that it supports:
What does JavaScript use to access and manipulate elements within an HTML document?
What does JavaScript use to access and manipulate elements within an HTML document?
Flashcards
JavaScript
JavaScript
A ubiquitous language for web client development.
Interpreted Language
Interpreted Language
A language executed directly by an interpreter without prior compilation.
Dynamic Language
Dynamic Language
A language that allows variable types to change at runtime.
Loosely Typed
Loosely Typed
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Accessing DOM
Accessing DOM
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document.getElementById
document.getElementById
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document.getElementsByTagName
document.getElementsByTagName
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document.querySelector
document.querySelector
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document.querySelectorAll
document.querySelectorAll
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Study Notes
JavaScript Overview
- JavaScript is a widely used language for creating web client applications (in web browsers).
- Its syntax is similar to C.
- It's an interpreted language.
- It uses dynamic typing.
- It's a loosely typed language.
- JavaScript supports multiple programming styles.
Embedding JavaScript
- JavaScript code can be directly embedded within HTML documents.
- External JavaScript files can be referenced using the "src" attribute within the
<script>tag. - Scripts are typically placed at the end of the
<body>section for better performance.
Accessing DOM Elements
- JavaScript provides methods to interact with HTML elements (DOM).
document.getElementById(): Retrieves an element using its unique ID.document.getElementsByTagName(): Retrieves a list of elements with the specified tag name.document.getElementsByName(): Retrieves a list of elements with the specified name.document.getElementsByClassName(): Retrieves a list of elements with the specified class(es).document.querySelector(): Selects the first matching element based on a CSS selector.document.querySelectorAll(): Selects all matching elements based on a CSS selector, returning a list.
Example Usage
document.getElementById('xpto'): Accesses the element with the ID "xpto".document.getElementsByTagName('p'): Accesses all<p>elements (presumably the first paragraph).document.getElementsByClassName('example'): Accesses the first element with the class "example".document.querySelector('#xpto'): Selects the first element with the ID "xpto".document.querySelectorAll('.example'): Selects all elements with the class "example" (presumably the first).
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