Introduction to JavaScript in Web Development
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Questions and Answers

What can JavaScript enable web designers to do?

  • Manipulate or move text and determine the user’s screen size
  • Create pop-up windows and perform mathematical calculations on data
  • Read elements from documents and write new elements and text into documents (correct)
  • Retrieve the current date and time from a user’s computer

    • Where can JavaScript be placed in a web page?

  • In the navigation bar of a page
  • In the of a page (correct)
  • In the footer section of a page
  • In the of a page

    • What does the type attribute in the opening tag of

  • The execution time of the JavaScript code
  • The visual style of the JavaScript code
  • The scripting language found inside the (correct)
  • The browser version that supports JavaScript

    • In what way can JavaScript react to events?

    <p>By alerting users if they enter the wrong information into a form or if they press a certain button</p> Signup and view all the answers

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

    <p>The browser must support JavaScript and have it enabled</p> Signup and view all the answers

    What file extension is used for external JavaScript documents?

    <p>.js</p> Signup and view all the answers

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

    <p>Document</p> Signup and view all the answers

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

    <p>The href property for the first link in the document</p> Signup and view all the answers

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

    <p>Accessing the value directly from the form object</p> Signup and view all the answers

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

    <p>Using external JavaScript files with the src attribute</p> Signup and view all the answers

    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.

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    Description

    Test your knowledge of the reasons to use JavaScript in web development and its capabilities such as interacting with HTML elements, creating pop-up windows, performing calculations, and reacting to user events.

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