Introduction to JavaScript in Web Development

10 Questions

What can JavaScript enable web designers to do?

Read elements from documents and write new elements and text into documents

Where can JavaScript be placed in a web page?

In the of a page

What does the type attribute in the opening tag of

The scripting language found inside the

In what way can JavaScript react to events?

By alerting users if they enter the wrong information into a form or if they press a certain button

What is a requirement for JavaScript to work in a browser?

The browser must support JavaScript and have it enabled

What file extension is used for external JavaScript documents?

.js

Which object represents the whole document in the Document Object Model (DOM)?

Document

What does the statement document.links.href retrieve in the DOM?

The href property for the first link in the document

What method can be used to ensure that users have entered appropriate values in a form control using JavaScript?

Accessing the value directly from the form object

How can you write JavaScript to run as the page loads?

Using external JavaScript files with the src attribute

Study Notes

JavaScript is a programming language used in web development to manipulate HTML and add functionality to websites
JavaScript enables web designers to make interactive elements like pop-ups, respond to user events, and perform calculations
JavaScript scripts can be added to HTML documents within the <script> tag. Browsers must support JavaScript and have it enabled
Scripts can be added at the beginning or end of the HTML document, or in an external .js file using the src attribute
Comments in JavaScript are used to add notes to the code, with the // symbol to indicate the start of a comment
Document Object Model (DOM) is a set of rules that defines the structure of a webpage. It allows JavaScript to access and manipulate various elements in the Document
JavaScript can access user-entered form data through the DOM and perform validation
DOM provides a way to access and manipulate different parts of a webpage, such as links, images, and form data.
Browsers that do not support JavaScript will display alternative content defined in the HTML document.
The DOM is used to make the content of forms and links available for use in the script, allowing for dynamic form validation and navigation.
JavaScript allows the creation of user interfaces, form validation, and content loading without requiring a complete page reload.
JavaScript can interact with other technologies like CSS and XML, allowing for complex web applications.
JavaScript can be used for creating interactive maps, animations, and games.
JavaScript frameworks like React, Angular, and Vue.js provide additional functionality and structure for building web applications.
JavaScript libraries like jQuery and Bootstrap provide pre-written code to simplify common web development tasks.
JavaScript can be used for server-side programming with technologies like Node.js and Express.js.
JavaScript provides cross-platform compatibility, allowing for the creation of web applications that can be accessed on various devices and browsers.