JavaScript IV: Document Object Model and Browser Object Model
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Questions and Answers

What does DOM stand for?

Document Object Model

How does the DOM relate to a web page?

It allows JavaScript to communicate with and change a web page.

What does BOM stand for?

Browser Object Model

How can you dynamically change the text content of an element using JavaScript?

<p>document.getElementById(&quot;elementId&quot;).innerText = &quot;New Text&quot;;</p> Signup and view all the answers

Which browser object allows you to check the browser's name, version, and platform?

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

The Document Object Model (DOM) can only be used to read the structure of a web page.

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

What is the purpose of the appendChild() method in JavaScript?

<p>To add a new node to the end of the child nodes of a parent element</p> Signup and view all the answers

What is the difference between creating a text node and setting innerText?

<p>Creating a text node is more convenient, while setting innerText is more efficient</p> Signup and view all the answers

How do you dynamically remove an element from the DOM?

<p>By calling the removeChild() method on the parent element of the node</p> Signup and view all the answers

What is the purpose of the createElement() method in JavaScript?

<p>To create a new element that can be added to the DOM</p> Signup and view all the answers

What is the relationship between a node and its parent element in the DOM?

<p>A node is a child of a parent element, and a parent element can have multiple nodes</p> Signup and view all the answers

What is the difference between a node and an element in the DOM?

<p>A node is a generic term that can refer to any type of object in the DOM, while an element is a specific type of node</p> Signup and view all the answers

What is the purpose of the createTextNode() method in JavaScript?

<p>To create a new text node that can be added to an element</p> Signup and view all the answers

What happens when you call the appendChild() method on a parent element?

<p>The node is added to the end of the child nodes of the parent element</p> Signup and view all the answers

How do you access the parent element of a node in JavaScript?

<p>By calling the parentNode property on the node</p> Signup and view all the answers

What is the result of calling the appendChild() method on a node that already has a parent element?

<p>The node is removed from its current parent element and added to the new parent element</p> Signup and view all the answers

Study Notes

Document Object Model (DOM)

  • The DOM is a structure that represents the HTML tags, attributes, and order of a web page
  • It allows JavaScript to communicate with and change a web page
  • The DOM is made up of nodes, which are the individual HTML tags and text elements
  • Nodes can be traversed and manipulated using JavaScript methods

DOM Tree

  • The DOM tree is a hierarchical representation of the DOM
  • It consists of parent and child nodes, sibling nodes, and text nodes
  • The DOM tree can be traversed and manipulated using JavaScript methods

Selecting Elements/Nodes

  • document.getElementById("id") selects an element with a specific ID
  • document.querySelector("selector") selects an element with a specific CSS selector
  • document.getElementsByTagName("tag") selects a group of elements with a specific tag name
  • document.getElementsByClassName("class") selects a group of elements with a specific class name

Dynamically Changing Text Content

  • element.innerText = "new text" changes the text content of an element
  • element.innerHTML = "new html" changes the HTML content of an element

Dynamically Changing Attributes

  • element.setAttribute("attribute", "value") sets an attribute of an element
  • element.getAttribute("attribute") gets the value of an attribute of an element

Dynamically Changing Style

  • element.style.property = "value" changes the style of an element
  • Properties that consist of more than one word are joined with a capital letter (e.g. fontSize)

Dynamically Adding New Elements

  • document.createElement("tag") creates a new element
  • element.appendChild(node) adds a new element to the DOM
  • element.innerHTML += "new html" adds new HTML content to an element

Events

  • Events are actions that users perform, such as clicking a button or moving the mouse
  • Events can be handled using inline handlers or event listeners
  • Event listeners can be added to elements using addEventListener method

Handling Events

  • Inline handlers are added as an attribute to an HTML element
  • Event listeners are added using the addEventListener method
  • Multiple event listeners can be added to an element

JavaScript Timing Events

  • setTimeout(function, delay) runs a function after a specified delay
  • setInterval(function, delay) runs a function at a specified interval
  • clearTimeout and clearInterval can be used to stop the execution of a function

Browser Object Model (BOM)

  • The BOM provides objects that allow JavaScript to interact with the browser
  • Objects include window, document, navigator, screen, history, and location
  • The BOM is not standardized across all browsers

BOM Objects

  • window object represents the browser window
  • document object represents the HTML document
  • navigator object provides information about the browser and its capabilities
  • screen object provides information about the screen and its dimensions
  • history object provides information about the browser's history
  • location object provides information about the current URL and allows navigation

Browser Compatibility Issues

  • Different browsers and versions may have different support for certain features and standards
  • Using common standard tags and features can help with compatibility issues

Document Object Model (DOM)

  • The DOM is a structure that represents the organization of a web page, including its HTML tags, attributes, and order.
  • It allows JavaScript to communicate with and modify a web page.
  • Each element and text in a web page is a node in the DOM.

DOM Tree

  • A DOM tree is a visual representation of the DOM, showing the relationships between nodes.
  • Nodes can have parent, child, and sibling relationships.
  • Examples of DOM trees include:
    • A basic HTML page structure
    • A unordered list with list items
    • A table with headings and rows

Selecting Elements/Nodes

  • You can select a single element/node using:
    • document.getElementById("id") or document.querySelector("#id")
  • You can select a group of elements/nodes using:
    • document.getElementsByTagName("tag") or document.querySelectorAll(".class")
  • Note that querySelector only returns the first matched element, while querySelectorAll returns all matched elements.

Creating and Modifying Elements/Nodes

  • You can create a new element/node using document.createElement("tag").
  • You can add content to an element/node using node.innerText = "content" or node.appendChild(textnode).
  • You can append a new element/node to an existing element/node using parent.appendChild(node).
  • You can remove a node by finding its parent and using parent.removeChild(node).

Create TextNode vs Setting InnerText

  • Creating a text node using document.createTextNode("content") and then appending it to an element/node is more precise.
  • Setting innerText directly using node.innerText = "content" is more convenient if the node only has text content.

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JavaScript IV.pptx

Description

This quiz covers the Document Object Model (DOM) and Browser Object Model, including their usage, structure, and role in web page development and web applications.

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