JavaScript DOM and BOM

Explain how to manipulate the DOM using JavaScript.

• Manipulating the DOM can be done by using CSS only.

• DOM manipulation in JavaScript is not possible.

• You can manipulate the DOM using methods like getAttribute, setAttribute, removeAttribute, etc.

• You can manipulate the DOM using methods like getElementById, getElementsByClassName, getElementsByTagName, createElement, appendChild, removeChild, etc.

What are event handlers in JavaScript DOM? Provide an example.

• Event handlers in JavaScript DOM are used to handle events such as click, submit, etc. They are used to define the behavior of an element when an event occurs. For example, you can use the onclick event handler to trigger a function when a button is clicked.

• Event handlers are used to define the structure of the HTML document in JavaScript DOM. For example, creating a new element when a form is submitted.

• Event handlers are used to style elements in JavaScript DOM. For example, changing the font color when a button is clicked.

• Event handlers in JavaScript DOM are used to create animations. For example, animating a div when the page loads.

How can you traverse the DOM using JavaScript?

• By using methods like getElementByClass, getElementByTag, querySelectorParent, querySelectorChild

• By using functions like findElementById, findElementsByClass, findElementsByTagName

• By using properties like firstChild, lastChild, nextElement, previousElement

• By using methods like getElementById, getElementsByClassName, getElementsByTagName, querySelector, querySelectorAll, parentNode, childNodes, nextSibling, previousSibling, etc.

Explain the process of creating a new DOM element using JavaScript.

• document.appendElement() method is used to create a new DOM element in JavaScript.

• newElement.createElement() method is used to create a new DOM element in JavaScript.

• document.createElement() method is used to create a new DOM element in JavaScript.

• document.makeElement() method is used to create a new DOM element in JavaScript.

How do you remove a DOM element using JavaScript?

• element.delete()

• element.removeChild()

• element.hide()

• element.remove() or parentElement.removeChild(element)

What are the different ways to work with forms in DOM using JavaScript?

• Directly modifying the HTML form tags

• Using jQuery to manipulate form data

• Accessing form elements using IDs or classes, adding event listeners, and manipulating form data using JavaScript

• Using CSS to style form elements

Explain the difference between DOM and BOM.

• DOM is responsible for handling user events, while BOM is responsible for manipulating the document structure.

• The DOM represents the document structure, style, and content, while the BOM represents the browser window and allows interaction with the browser.

• DOM is specific to Internet Explorer, while BOM is specific to Firefox.

• DOM is used for server-side scripting, while BOM is used for client-side scripting.

How can you access the browser's history using BOM in JavaScript?

• window.history

• browser.history

• window.browserHistory

• document.history

What are the different properties of the window object in BOM?

• keyboard

• location, history, navigator, screen, document, and many more

• mouse

• printer