JavaScript Events Quiz

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29 Questions

Which JavaScript event occurs when the user double-clicks on an element?

ondblclick

What JavaScript event occurs when the user right-clicks on an element to open a context menu?

oncontextmenu

Which event occurs when the user moves the mouse pointer out of an element or one of its children?

onmouseout

When does the 'onmouseenter' event occur in JavaScript?

When the pointer moves onto an element

What event occurs when the user releases a mouse button while over an element?

onmouseup

Which JavaScript event occurs when the pointer is moving while it is over an element?

onmousemove

What should be used instead of curved quotation marks in the provided HTML code?

Double quotes

What does the document.bgColor property allow you to change?

The background color of the entire webpage

What is the purpose of the onmouseover event handler in the provided HTML code?

To change the background color of the entire page to green

What is the general form of a JavaScript function?

Using the function keyword and taking parameters, and returning a value

How do JavaScript functions help organize code?

By promoting code reusability

Which HTML element is used to create a large and bold heading text?

What happens when the mouse pointer moves away from the heading text in the provided HTML code?

The background color changes back to yellow

What does the align='center' attribute do in the `` element?

Horizontally center-aligns the text

Which attribute is used to specify what should happen when the mouse pointer interacts with an element in the provided HTML code?

onmouseover

Who was the creator of JavaScript?

Brendan Eich

What was the initial name of JavaScript during its development?

Mocha

In what year was JavaScript created?

1995

Which company was Brendan Eich working for when he created JavaScript?

Netscape Communications

What strategic partnership led to the renaming of JavaScript?

Sun Microsystems

What type of programming language is JavaScript primarily used for?

Web development

When was ECMAScript 3 released?

1999

What significant enhancements were introduced in ECMAScript 5 (ES5)?

Strict mode, JSON support, improved array manipulation methods

What significantly accelerated web development in the 2000s - Present era?

JavaScript libraries like jQuery and frameworks like Angular and React

Who developed Node.js, bringing JavaScript to the server-side?

Ryan Dahl

What is the primary purpose of ECMAScript 6 (ES6)?

To introduce numerous new features and enhancements to JavaScript

What is the Document Object Model (DOM) primarily used for in JavaScript?

Manipulating web page elements dynamically

What are some examples of JavaScript libraries and frameworks that significantly accelerated web development?

jQuery and Angular

In what year was Node.js developed, bringing JavaScript to the server-side?

2009

Study Notes

JavaScript Events

  • The dblclick event occurs when the user double-clicks on an element.
  • The contextmenu event occurs when the user right-clicks on an element to open a context menu.
  • The mouseout event occurs when the user moves the mouse pointer out of an element or one of its children.
  • The onmouseenter event occurs when the user moves the mouse pointer into an element.
  • The mouseup event occurs when the user releases a mouse button while over an element.
  • The mousemove event occurs when the pointer is moving while it is over an element.

HTML and JavaScript

  • Straight quotation marks should be used instead of curved quotation marks in HTML code.
  • The document.bgColor property allows you to change the background color of a document.
  • The onmouseover event handler is used to specify what should happen when the mouse pointer interacts with an element.
  • The general form of a JavaScript function is function name(parameters) { code }.
  • JavaScript functions help organize code by grouping related statements together.

HTML Elements

  • The `` element is used to create a large and bold heading text.
  • The align='center' attribute is used to center-align the content of an element.
  • The onmouseover and onmouseout event handlers are used to specify what should happen when the mouse pointer interacts with an element.

JavaScript History

  • JavaScript was created by Brendan Eich in 1995 while working at Netscape Communications.
  • The initial name of JavaScript during its development was Mocha.
  • JavaScript was renamed from Mocha to JavaScript due to a strategic partnership with Sun Microsystems.
  • JavaScript is primarily used for client-side scripting on the web.

ECMAScript

  • ECMAScript 3 was released in 1999.
  • ECMAScript 5 (ES5) introduced significant enhancements, including strict mode and native JSON support.
  • ECMAScript 6 (ES6) introduced new features, such as classes and promises, to improve the language.
  • ECMAScript is the standard scripting language for web browsers.

Node.js and Server-Side JavaScript

  • Node.js was developed by Ryan Dahl in 2009, bringing JavaScript to the server-side.
  • Node.js allows JavaScript to run on the server-side, making it possible to use JavaScript for both client-side and server-side development.

JavaScript Libraries and Frameworks

  • Examples of JavaScript libraries and frameworks that significantly accelerated web development include jQuery, React, and Angular.
  • These libraries and frameworks provide pre-built functionality and tools to make web development faster and more efficient.

Document Object Model (DOM)

  • The Document Object Model (DOM) is primarily used to interact with and manipulate the structure and content of web pages.
  • The DOM represents the structure of a document as a tree of nodes, allowing JavaScript to access and modify the document's elements and content.

Test your knowledge on JavaScript events, which are actions or occurrences that happen in the browser as a result of user interactions or system events. Learn how to respond to these events by defining functions that will execute when the event occurs.

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