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JavaScript DOM
This section covers the JavaScript Document Object Model (DOM) and shows you how to manipulate DOM elements effectively.Section 1. Getting started
Section 2. Selecting elements
getElementById() – select an element by id.
getElementsByName() – select elements by name.
getElementsByTagName() – select elements by a tag name.
getElementsByClassName() – select elements by one or more class names.
querySelector() – select elements by CSS selectors.
Section 3. Traversing elements
Get the parent element – get the parent node of an element.
Get child elements – get children of an element.
Get siblings of an element – get siblings of an element.
Section 4. Manipulating elements
createElement() – create a new element.
appendChild() – append a node to a list of child nodes of a specified parent node.
textContent – get and set the text content of a node.
innerHTML – get and set the HTML content of an element.
innerHTML vs. createElement – explain the differences between innerHTML and createElement when it comes to
creating new elements.
DocumentFragment – learn how to compose DOM nodes and insert them into the active DOM tree.
after() – insert a node after an element.
append() – insert a node after the last child node of a parent node.
prepend() – insert a node before the first child node of a parent node.
insertAdjacentHTML() – parse a text as HTML and insert the resulting nodes into the document at a specified position.
replaceChild() – replace a child element by a new element.
cloneNode() – clone an element and all of its descendants.
removeChild() – remove child elements of a node.
insertBefore() – insert a new node before an existing node as a child node of a specified parent node.
insertAfter() helper function – insert a new node after an existing node as a child node of a specified parent node.
Section 5. Working with Attributes
HTML Attributes & DOM Object’s Properties – understand the relationship between HTML attributes & DOM object’s properties.
setAttribute() – set the value of a specified attribute on a element.
getAttribute() – get the value of an attribute on an element.
removeAttribute() – remove an attribute from a specified element.
hasAttribute() – check if an element has a specified attribute or not.
Section 6. Manipulating Element’s Styles
style property – get or set inline styles of an element.
getComputedStyle() – return the computed style of an element.
className property – return a list of space-separated CSS classes.
classList property – manipulate CSS classes of an element.
Element’s width & height – get the width and height of an element.
Section 7. Working with Events
JavaScript events – introduce you to the JavaScript events, the event models, and how to handle events.
Handling events – show you three ways to handle events in JavaScript.
Page Load Events – learn about the page load and unload events.
load event – walk you through the steps of handling the load event originating from the document, image, and script elements.
DOMContentLoaded – learn how to use the DOMContentLoaded event correctly.
beforeunload event – guide you on how to show a confirmation dialog before users leave the page.
unload event – show you how to handle the unload event that fires when the page is completely unloaded.
Mouse events – how to handle mouse events.
Keyboard events – how to deal with keyboard events.
Scroll events – how to handle scroll events effectively.
scrollIntoView – learn how to scroll an element into view.
Focus Events – cover the focus events.
haschange event – learn how to handle the event
when URL hash changes.Event Delegation – is a technique of levering event bubbling to handle events at a higher level in the DOM than the element on which the event originated.
dispatchEvent – learn how to generate an event from code and trigger it.
Custom Events – define a custom JavaScript event and attach it to an element.
MutationObserver – monitor the DOM changes and invoke a callback when the changes occur.
Section 8. Scripting Web Forms
JavaScript Form – learn how to handle form submit event and perform a simple validation for a web form.
Radio Button – show you how to write the JavaScript for radio buttons.
Checkbox – guide you on how to manipulate checkbox in JavaScript.
Select box – learn how to handle the select box and its option in JavaScript.
Add / Remove Options – show you how to dynamically add options to and remove options from a select box.
Removing Items from select element conditionally – show you how to remove items from a select element conditionally.
Handling change event – learn how to handle the change event of the input text, radio button, checkbox, and select elements.
Handling input event – handle the input event when the value of the input element changes.