Document.getElementsByClassName vs Document.querySelector

Developers should use getElementsByClassName when they need to select multiple elements that share a common class, such as styling all buttons with a specific class or updating content in a group of similar elements meets developers should use document. Here's our take.

Document.getElementsByClassName

Nice Pick

Developers should use getElementsByClassName when they need to select multiple elements that share a common class, such as styling all buttons with a specific class or updating content in a group of similar elements

Pros

• It is particularly useful for dynamic web applications where elements are added or removed, as the returned collection updates automatically
• Related to: javascript, dom-manipulation

Cons

• Specific tradeoffs depend on your use case

Document.querySelector

Developers should use Document

Pros

• querySelector when they need to select a single DOM element based on a CSS selector, such as for attaching event listeners, modifying content, or applying styles
• Related to: javascript, dom-manipulation

Cons

• Specific tradeoffs depend on your use case

The Verdict

Use Document.getElementsByClassName if: You want it is particularly useful for dynamic web applications where elements are added or removed, as the returned collection updates automatically and can live with specific tradeoffs depend on your use case.

Use Document.querySelector if: You prioritize queryselector when they need to select a single dom element based on a css selector, such as for attaching event listeners, modifying content, or applying styles over what Document.getElementsByClassName offers.

The Bottom Line

Document.getElementsByClassName wins

Developers should use getElementsByClassName when they need to select multiple elements that share a common class, such as styling all buttons with a specific class or updating content in a group of similar elements