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DOM selection methods are used to find and access HTML elements so that JavaScript can interact with them.
Without selecting elements, you can’t manipulate anything.
Method | Description | Returns |
| getElementById() | Select by ID | Single Element |
| getElementsByClassName() | Select by class | HTMLCollection |
| getElementsByTagName() | Select by tag | HTMLCollection |
| querySelector() | First matching CSS selector | Single Element |
| querySelectorAll() | All matching elements | NodeList |
| // By ID let title = document.getElementById("title"); // By Class let items = document.getElementsByClassName("item"); // By Tag let paragraphs = document.getElementsByTagName("p"); // CSS Selector (first match) let box = document.querySelector(".box"); // CSS Selector (all matches) let allBoxes = document.querySelectorAll(".box"); |
Technical Example
| let buttons = document.querySelectorAll("button"); buttons.forEach(btn => { btn.style.backgroundColor = "blue"; }); |
Here:
1. Selecting a Login Button
You select the login button to handle clicks:
| let btn = document.getElementById("loginBtn"); |
2. Selecting Multiple Products 
Select all product cards:
| let products = document.getElementsByClassName("product"); |
3. Styling All Paragraphs
| let p = document.getElementsByTagName("p"); |
4. Advanced UI Selection
| let input = document.querySelector("form input"); |
Difference: querySelector vs getElementById?
HTMLCollection vs NodeList?
Which should you use?
Modern approach:
Prefer querySelector / querySelectorAll
One-Line Interview Answer
“DOM selection methods allow JavaScript to access HTML elements using ID, class, tag, or CSS selectors so they can be manipulated dynamically.”
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What are DOM Selection Methods?
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