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# Web Site Writing Basics

# javascript

# Html_ Dom

HTML DOM stands for Document Object Model for HTML.

It is a programmatic standard interface that allows programs or scripts (such as JavaScript) to access and manage the content, structure, and style of HTML documents.

Components and Significance

Representation:

DOM converts an HTML document (which is text) into a Tree Structure of Objects.

Each component of HTML, such as < html >, < body >, < p >, and even the text inside, is represented by a node or object called a DOM Node.

Access and management:

Since everything is represented by objects, JavaScript can use DOM properties and methods to:

Change HTML elements (e.g., changing text in paragraphs, changing color).

Add / Remove New HTML Element.

Respond to user events (such as mouse clicks).

Change the CSS style of the elements.

In short, HTML DOM is a map and a toolkit that JavaScript uses to "talk" and "control" a dynamic web page, so that web pages are not just still documents, but can interact and change in real-time.

2025/10/24 Edited to

... Read moreถ้าเพิ่งเริ่มกับ html javascript เรามักจะได้ยินคำว่า “DOM” บ่อยมาก เราแนะนำให้จำภาพง่าย ๆ ก่อนว่า HTML เป็นโครงสร้างหน้าเว็บ ส่วน DOM คือ “ต้นไม้ของออบเจกต์” ที่เบราว์เซอร์สร้างขึ้นจาก HTML อีกที เพื่อให้ JavaScript เข้ามาจัดการได้ ภาพรวม DOM Tree (เหมือนในรูปที่เจอบ่อย): เริ่มที่ document แล้วแตกเป็น <html> จากนั้นมี <head> และ <body> ภายในก็มี element ลูก ๆ เช่น <h1> <p> <a> รวมถึง node ประเภท text (ข้อความ) และ attribute (เช่น href) ด้วย พอเข้าใจว่าเว็บถูกแปลงเป็นต้นไม้ เราจะหา “กิ่ง” ที่ต้องการ แล้วแก้มันได้ ตัวอย่างพื้นฐานที่เราใช้บ่อยเวลาเริ่มทำเว็บแบบโต้ตอบ: 1) เลือก element จากหน้าเว็บ - document.getElementById('title') เหมาะกับของที่มี id ชัด ๆ - document.querySelector('.btn') เลือกตัวแรกที่ตรงเงื่อนไข - document.querySelectorAll('p') ได้รายการหลายตัว (NodeList) 2) เปลี่ยนข้อความ/HTML - el.textContent = 'สวัสดี DOM' (ปลอดภัย ใช้กับข้อความ) - el.innerHTML = '<b>หนา</b>' (ยืดหยุ่น แต่ต้องระวังข้อมูลที่มาจากผู้ใช้) 3) เปลี่ยนสไตล์ (CSS) แบบเร็ว ๆ - el.style.color = 'red' - el.classList.add('active') / remove / toggle (วิธีนี้นิยมกว่าเพราะจัดการผ่าน class) 4) จัดการ attribute ที่เจอบ่อยกับลิงก์ เช่น <a href="..."> เราแก้ได้ด้วย - link.setAttribute('href', 'https://example.com') - link.getAttribute('href') 5) เพิ่ม/ลบ element - const p = document.createElement('p') - p.textContent = 'เพิ่มย่อหน้าใหม่' - document.body.appendChild(p) - el.remove() (ลบ element ออกจาก DOM) 6) ทำให้เว็บ “โต้ตอบ” ด้วย events อันนี้คือหัวใจของการใช้ DOM กับ JavaScript เช่นปุ่มคลิกแล้วเปลี่ยนข้อความ: - btn.addEventListener('click', () => { title.textContent = 'คลิกแล้ว!' }) ทิปเล็ก ๆ จากประสบการณ์: ถ้าสคริปต์รันแล้วหา element ไม่เจอ ให้เช็กว่าเราเขียน JS ก่อน HTML โหลดเสร็จไหม วิธีง่ายคือวาง <script> ไว้ก่อนปิด </body> หรือใช้ DOMContentLoaded เพื่อรอให้ DOM พร้อมก่อนค่อยทำงาน สรุปคือ DOM เป็น “สะพาน” ระหว่าง HTML กับ JavaScript ทำให้หน้าเว็บจากเอกสารนิ่ง ๆ กลายเป็นหน้าเว็บที่แก้ได้แบบเรียลไทม์ ทั้งข้อความ โครงสร้าง และสไตล์

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Are you interested in gaining skills and building your resume? Courses are a great way to do this without breaking the bank. Some of these course platforms are a subscription and some are a per-course pay. The subscriptions can be worth it if you work on your courses often! Here are some popular
Itsleilahclaire

Itsleilahclaire

162 likes

A list titled "BEST YOUTUBE CHANNELS TO LEARN..." featuring various tech topics like Cybersecurity, Python, React, JavaScript, Java, DevOps, Blockchain, AI/ML, Web Development, AWS, Swift, SQL, DBMS, Ruby, Scala, SAP, C, R, jQuery, C#, .NET, Kotlin, Flutter, Laravel, and PHP, each paired with a recommended YouTube channel. The image includes a YouTube logo and the handle @securitytrybe.
Top YouTube Channels for Tech Mastery 🔑ℹ️⬇️
Unlock Your Tech Potential: The Best YouTube Channels for Learning Ever felt like the world of tech is just out of reach? Whether you’re diving into cybersecurity or mastering the nuances of UI/UX design, these YouTube channels will guide you every step of the way. Let’s break down the best reso
RoadToRiches

RoadToRiches

85 likes

Learn Coding the Easy Way!
#LearnToCode #CodingTutorials #ProgrammingForBeginners #TechEducation #CodeWithMe
InsightEvolution

InsightEvolution

2 likes

🎓 Websites That Teach You For Free 🎓
Ready to level up your tech skills without spending a dime? Here's a list of websites offering free courses across various fields. Let's get started! 🚀 🤖 Artificial Intelligence (AI) • http://elementsofai.com • http://lnprogrammer.com 🌐 Web Development HTML • http://html.com • ht
Valder

Valder

200 likes

A coding workstation with multiple monitors displaying code, a laptop, and a keyboard. A black cap rests on the desk. Text overlay reads "Best AI app to Learn coding," promoting an app for learning programming.
Best AI app to Learn coding
Tired of feeling stuck when learning to code? I’ve tried YouTube tutorials, free bootcamps, and dozens of apps—but nothing worked consistently… until I found BootSelf. BootSelf isn’t just a coding app—it’s your AI-powered mentor that teaches, explains, and even prepares you for your tech career
Code with BootSelf AI

Code with BootSelf AI

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Jumpstart Your Tech Journey with These 💻
Ready to dive into the tech world but not sure where to start? Here are five top online courses that are perfect for beginners looking to break into tech: 1. CS50's Introduction to Computer Science by Harvard: This course provides a comprehensive introduction to computer science, covering al
Dominica Amauri

Dominica Amauri

10 likes

🌹 From Python, JavaScript and SQL Books to Code Dreams: This Is Me
🌹 From Budget Books to Code Dreams: This Is Me This beautiful character-sheet portrait captures me being organized, resilient, and focused on growth. I am surrounded by planners, notebooks, coding references, roses, and inspirational reminders, I represent the perfect blend of determination and
mirandaperry05

mirandaperry05

1 like

HTML Cheat Sheet
Essential HTML tags every developer needs! 🚀 Quick reference guide covering structure, text, links, images, forms & more. Perfect for beginners and coding bootcamps! Save this for your next project 💻✨ #HTML #WebDevelopment #Coding #Programming #webdev
EM

EM

1 like

AI taught me to code faster than any course.
💡 Tired of watching endless tutorials and still getting stuck? I used to spend hours Googling every coding error—until I found BootSelf, the AI coding mentor that actually teaches you like a human would. This isn’t a course. It’s a 24/7 AI mentor that: ✅ Explains code in real time ✅ Reviews a
Code with BootSelf AI

Code with BootSelf AI

9 likes

An image featuring Kim Kardashian in front of a Harvard University building, with text announcing Harvard's free online courses and listing 8 courses for 2025.
A screenshot of a Harvard webpage detailing the 'Artificial Intelligence in Business: Creating Value with Machine Learning' course, including start dates and a classroom photo.
A screenshot of a Harvard webpage for 'Data Science: Machine Learning,' showing course duration, time commitment, and that it is free and online.
If Harvard is trying to help people go to college for free, then I’m all for it, I wonder if this administration will look at these different specific types of careers as professional or not but then again if you go to these classes and graduate and get accredited from Harvard, who gives a fuck if
CORALOUW/🥇 achievements

CORALOUW/🥇 achievements

6 likes

HTML Cheat Sheet
Essential HTML tags every developer needs! 🚀 Quick reference guide covering structure, text, links, images, forms & more. Perfect for beginners and coding bootcamps! Save this for your next project 💻✨ #HTML #WebDevelopment #Coding #Programming #webdev
EM

EM

1 like

A dark blue background with text "5 MORE YOUTUBE CHANNELS PART 2 TO BOOST YOUR CODING SKILLS". A computer monitor displays a YouTube logo, coding language icons (HTML, Python, React, JavaScript), and a code snippet. Text at the bottom says "SWIPE TO UNLOCK CODING GOLD!".
A dark blue background featuring the YouTube channel "SuperSimpleDev" with its channel page displayed on a monitor. Text highlights its benefits: step-by-step beginner tutorials for HTML, CSS, JavaScript, teaching from scratch, practical web development, and a friendly style.
A dark blue background featuring the YouTube channel "EJ Media" with its channel page displayed on a monitor. Text highlights its benefits: beginner-friendly UI/UX and frontend projects, covering Tailwind CSS, animations, and landing pages, with modern, portfolio-ready projects.
5 More YouTube Channels Part 2
#codingforbeginners #learntocode #youtubecoding #webdevelopment #pythonforbeginners
Aysha

Aysha

65 likes

The Most In-Demand Programming Languages in 2025
#codingforbeginners #htmlcssforbeginners #studymotivation #programming #softwareengineering
Aysha

Aysha

30 likes

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