Podcast
Questions and Answers
Which of the following is NOT a feature of JavaScript?
Which of the following is NOT a feature of JavaScript?
What is the recommended placement for JavaScript code in an HTML document?
What is the recommended placement for JavaScript code in an HTML document?
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'?
What is the purpose of the 'src' attribute in a <script> tag?
What is the purpose of the 'src' attribute in a <script> tag?
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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'?
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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?
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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?
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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:
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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?
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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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Description
This quiz covers the fundamental aspects of JavaScript, including its syntax, properties, and how to embed it within HTML. Learn how to interact with DOM elements and understand the language's dynamic and loosely typed nature.
