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queryselector vs getelementbyid multiple id
(version: 0)
Comparing performance of:
queryselector vs getelementbyid
Created:
2 years ago
by:
Guest
Go to the latest result
HTML Preparation code:
<div id="testElement"></div> <div id="testElementTwo"></div> <div id="testElementThree"></div> <div id="testElementFour"></div> <div id="testElementFive"></div>
Tests:
queryselector
var el = document.querySelector('#testElement'); var className = el.className;
getelementbyid
var el = document.getElementById('testElementFive'); 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:
2 years ago
)
User agent:
Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/126.0.0.0 Safari/537.36
Browser/OS:
Chrome 126 on Linux
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Embed Benchmark Result
<iframe src="https://measurethat.net/Embed?id=536724" width="100%" height="500px"></iframe>
getelementbyid
8.1M/s
queryselector
4.6M/s
View exact numbers
Test name
Executions per second
✓
getelementbyid
8,136,303 Ops/sec
queryselector
4,589,852 Ops/sec
Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Let's dive into the world of JavaScript microbenchmarks on MeasureThat.net. **Benchmark Overview** The provided benchmark compares two approaches for selecting elements in an HTML document: `querySelector` and `getElementById`. Specifically, it tests how fast these two methods can retrieve the class name of an element with a unique ID (`testElementFive`). **Options Compared** There are only two options being compared: 1. **`querySelector`**: This method uses CSS selectors to select elements. In this case, it's used to select `#testElementFive`. 2. **`getElementById`**: This method uses the `id` attribute of an element to identify and retrieve it. **Pros and Cons** **`querySelector`** Pros: * More flexible and powerful than `getElementById`, as it can be used to select elements based on various CSS selectors. * Can be more efficient for larger, complex documents. Cons: * May be slower than `getElementById` due to the overhead of parsing CSS selectors. * Requires a compatible browser that supports CSS selectors (most modern browsers do). **`getElementById`** Pros: * Faster and more lightweight compared to `querySelector`. * Works in older browsers that don't support CSS selectors. Cons: * Less flexible and powerful than `querySelector`, as it only selects elements by their ID. * May be less efficient for larger documents. **Other Considerations** In this specific benchmark, the use of a unique ID (`testElementFive`) ensures that both methods are selecting the same element. However, in real-world scenarios, you might encounter cases where multiple elements have the same `id` attribute, or where you need to select elements based on different attributes. **Library and Purpose** In this benchmark, no external libraries are used. Both methods rely on the built-in JavaScript APIs of modern browsers. However, if you were to implement a similar benchmark for other element selection methods, you might consider using libraries like `jQuery` or `DOMParser`, which provide more flexible and powerful ways to select elements in HTML documents. **Special JS Feature or Syntax** There are no special JavaScript features or syntax used in this benchmark. The focus is solely on comparing two established element selection methods. **Alternative Approaches** Other approaches for selecting elements include: 1. **`getContextById`**: This method is similar to `getElementById`, but it uses the `id` attribute of an HTML element to get a reference to its corresponding DocumentFragment. 2. **`querySelectorAll`**: While not exactly equivalent to `querySelector`, this method can be used to select multiple elements that match a CSS selector, which might be useful in certain scenarios. Keep in mind that these alternative approaches might not provide the same performance characteristics as `querySelector` and `getElementById`, so it's essential to consider your specific use case and requirements when choosing an element selection method.
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