DOM Basics Selecting and Changing Elements
Continue your JavaScript Tutorial learning path with hands-on explanation, code practice, and quiz.
Course
JavaScript Tutorial
Estimated Time
8 min
Progress
16%
Track Position
12 / 73
Lesson Overview
Simple Explanation
DOM browser me HTML ka tree representation hai. getElementById aur querySelector se elements select karte hain. text aur styles runtime me update kar sakte hain.
Code Explanation
Button click par textContent aur style change ho rahe hain.
Output Description
Heading ka color aur content change hoga.
Practice Exercise
Ek card banao jisme click par background aur title dono update ho.
Extra Explanation
Why This Matters
DOM Basics Selecting and Changing Elements is core to dynamic behavior. Strong fundamentals here help you build forms, API flows, and interactive UI with confidence.
Real-World Workflow
Complex features are usually split into small functions, then verified through focused logging and tiny test cases.
Common Mistakes to Avoid
Avoid uncontrolled globals, weak error handling, and ignored async states. Define clear input-output expectations for each function.
Example + Live Practice
<!DOCTYPE html>
<html>
<body>
<h1 id="title">Original Title</h1>
<button id="btn">Change</button>
<script>
const title = document.getElementById("title");
const btn = document.querySelector("#btn");
btn.addEventListener("click", () => {
title.textContent = "Updated by JavaScript";
title.style.color = "tomato";
title.style.fontFamily = "sans-serif";
});
</script>
</body>
</html>Try It Yourself
Test Your Knowledge
Quiz Coming Soon
Quiz for this lesson is not added yet.
Save Your Work
Lesson ke end par apna code save karein. Dashboard me aap kabhi bhi is saved code ko dobara dekh sakte hain.