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queryselector vs getelementbyid with classes and ids
(version: 0)
Comparing performance of:
querySelector vs getElementById
Created:
2 years ago
by:
Guest
Go to the latest result
HTML Preparation code:
<div class="container"> <div class="header"></div> <div class="content"> <div class="title"></div> <div class="text"> <div id="testElement"></div> </div> </div> <div class="footer"></div> </div>
Tests:
querySelector
var el = document.querySelector('#testElement'); var className = el.className;
getElementById
var el = document.getElementById('testElement'); var className = el.className;
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
Previous results
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Test case name
Result
querySelector
getElementById
Fastest:
N/A
Slowest:
N/A
Latest run results:
Run details:
(Test run date:
one year ago
)
User agent:
Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:139.0) Gecko/20100101 Firefox/139.0
Browser/OS:
Firefox 139 on Mac OS X 10.15
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Embed Benchmark Result
<iframe src="https://measurethat.net/Embed?id=610617" width="100%" height="500px"></iframe>
getElementById
8.6M/s
querySelector
6.3M/s
View exact numbers
Test name
Executions per second
✓
getElementById
8,550,460 Ops/sec
querySelector
6,337,272 Ops/sec
Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Let's dive into the details of this benchmark. **What is being tested?** The provided JSON represents a JavaScript microbenchmark that compares two different ways to retrieve an element from an HTML document: `querySelector` and `getElementById`. Both methods are used to access an element with a specific class name (`className`) and ID (`id`). **Options compared** There are two options compared: 1. **`querySelector`**: This method uses CSS selectors to select the desired element. It's more flexible than `getElementById`, as it allows you to target elements based on their classes, IDs, tag names, and other attributes. 2. **`getElementById`**: This method uses a simple ID-based lookup to retrieve an element. It's faster for retrieving an element by its unique ID but less flexible than `querySelector`. **Pros and Cons** * `querySelector`: + Pros: more flexible, works with multiple classes and IDs, can be used in conjunction with other CSS selectors. + Cons: potentially slower than `getElementById`, as it requires parsing the HTML document to determine which element matches the selector. * `getElementById`: + Pros: faster for retrieving an element by its unique ID, as it doesn't require parsing the HTML document. + Cons: less flexible, only works with a single ID per element. **Library** In this benchmark, there is no specific library used. The `querySelector` and `getElementById` methods are built-in JavaScript APIs. **Special JS feature or syntax** There is no special JavaScript feature or syntax used in this benchmark. However, it's worth noting that the `querySelector` method was introduced in ECMAScript 5 (ES5) as a replacement for `getElementsByTagName`. **Other alternatives** If you're interested in exploring alternative methods to retrieve elements from an HTML document, here are some options: * **`getElementsByClassName`**: This method returns a list of all elements with the specified class name. * **`querySelectorAll`**: Similar to `querySelector`, but returns a NodeList of all matching elements instead of a single element. * **`getElementsByTagName`**: Returns a NodeList of all elements with the specified tag name. These alternatives offer different trade-offs in terms of flexibility, performance, and compatibility across browsers.
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