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querySelectorAll data attribute vs class name vs getElementsByClassName
(version: 0)
Comparing performance of:
data-attribute vs querySelectorAll vs getElementsByClassName
Created:
4 years ago
by:
Guest
Jump to the latest result
HTML Preparation code:
<div class="test" data-attribute="test"></div> <div class="test" data-attribute="test"></div> <div class="test" data-attribute="test"></div> <div class="test" data-attribute="test"></div> <div class="test" data-attribute="test"></div> <div class="test" data-attribute="test"></div> <div class="test" data-attribute="test"></div> <div class="test" data-attribute="test"></div> <div class="test" data-attribute="test"></div> <div class="test" data-attribute="test"></div> <div class="test" data-attribute="test"></div> <div class="test" data-attribute="test"></div> <div class="test" data-attribute="test"></div> <div class="test" data-attribute="test"></div> <div class="test" data-attribute="test"></div> <div class="test" data-attribute="test"></div> <div class="test" data-attribute="test"></div> <div class="test" data-attribute="test"></div> <div class="test" data-attribute="test"></div> <div class="test" data-attribute="test"></div> <div class="test" data-attribute="test"></div> <div class="test" data-attribute="test"></div> <div class="test" data-attribute="test"></div> <div class="test" data-attribute="test"></div>
Tests:
data-attribute
var test = document.querySelectorAll('[data-attribute="test"]');
querySelectorAll
var test = document.querySelectorAll('.test');
getElementsByClassName
var test = document.getElementsByClassName('.test');
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (3)
Previous results
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Test case name
Result
data-attribute
querySelectorAll
getElementsByClassName
Fastest:
N/A
Slowest:
N/A
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Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
**Overview** MeasureThat.net is a website that allows users to create and run JavaScript microbenchmarks. In this case, we're analyzing a benchmark that compares the performance of three methods to select elements with a specific attribute or class name: `querySelectorAll`, `getElementsByClassName`, and accessing an element's `data-attribute` directly. **What is tested?** The benchmark tests the execution speed of these three approaches in the following test cases: 1. `data-attribute`: Accessing an element's `data-attribute` directly. 2. `querySelectorAll`: Using the `querySelectorAll()` method to select elements with a specific class name or attribute value. 3. `getElementsByClassName`: Using the `getElementsByClassName()` method to select elements with a specific class name. **Options compared** The benchmark compares the performance of three options: 1. Direct access: Accessing an element's `data-attribute` directly using the dot notation (`test.data-attribute`). 2. `querySelectorAll`: Using the `querySelectorAll()` method to select elements with a specific class name or attribute value. 3. `getElementsByClassName`: Using the `getElementsByClassName()` method to select elements with a specific class name. **Pros and Cons** Here are some pros and cons of each approach: 1. **Direct access**: Pros: * Fastest, as it involves only a single property access. * Most readable and intuitive. Cons: * May not work consistently across different browsers or versions. 2. **`querySelectorAll`**: * Pros: + Works consistently across different browsers and versions. + Can be used to select multiple elements at once. * Cons: + May be slower than direct access due to the additional overhead of parsing the CSS selector. + Requires an explicit class name or attribute value, which may not always be present. 3. **`getElementsByClassName`**: * Pros: + Works consistently across different browsers and versions. + Can be used to select multiple elements at once. * Cons: + May be slower than direct access due to the additional overhead of parsing the class name or attribute value. + Returns an array of elements, which may require additional processing. **Library usage** None of the test cases use any external libraries. The `querySelectorAll` and `getElementsByClassName` methods are built-in to the DOM API. **Special JS features or syntax** There are no special JavaScript features or syntax used in this benchmark. It only uses standard ECMAScript syntax for accessing elements by attribute or class name. **Other alternatives** If you need to select elements with a specific attribute value, you may also use the `getAttribute()` method, which is another built-in DOM API method. However, this method returns a string value, whereas `querySelectorAll` and `getElementsByClassName` return an array of elements.
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