Apa itu dom javascript

This section covers the JavaScript Document Object Model (DOM) and shows you how to manipulate DOM elements effectively.

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 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 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 element conditionally – show you how to remove items from a 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.

JavaScript DOM Projects

Word Counter

A step-by-step guide you on how to develop a Word Counter app.

Countdown Timer

Make a reusable countdown timer and use it to build the New Year countdown.

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