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querySelectorAll vs getElementsByName
(version: 0)
Which is faster
Comparing performance of:
getElementsByName vs querySelectorAll vs querySelectorAll2
Created:
5 years ago
by:
Guest
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HTML Preparation code:
<div id="testdiv"> <div class="unique" name="unique" >test</div> <div class="unique" name="unique" >test</div> <div class="unique" name="unique" >test</div> <div class="unique" name="unique" >test</div> </div>
Script Preparation code:
var doc = document;
Tests:
getElementsByName
var test = doc.getElementsByName('unique');
querySelectorAll
var test = doc.querySelectorAll('.unique');
querySelectorAll2
var test = doc.querySelectorAll('[name="unique"]');
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (3)
Previous results
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Test case name
Result
getElementsByName
querySelectorAll
querySelectorAll2
Fastest:
N/A
Slowest:
N/A
Latest run results:
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Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
**Benchmark Explanation** The MeasureThat.net benchmark compares the performance of three different approaches to retrieve elements from an HTML document in JavaScript: 1. `getElementsByName`: This method uses the `getName()` method to get the value of the `name` attribute of each element, and then iterates over the resulting array to find the desired element. 2. `querySelectorAll`: This method uses CSS selectors to select all elements that match a specific pattern. In this case, the selector is `.unique`, which matches all elements with the class `unique`. 3. `querySelectorAll2`: This method uses a slightly more complex CSS selector: `[name="unique"]`. It selects all elements whose `name` attribute has the value "unique". **Comparison of Approaches** * **getElementsByName**: This approach is simple and easy to understand, but it can be slow because it iterates over the entire array of elements. The `getName()` method can also return null values if an element does not have a `name` attribute. * **querySelectorAll**: This approach uses CSS selectors, which can be more efficient than iterating over arrays. However, it requires knowledge of CSS syntax and may not work in older browsers that do not support CSS selectors. * **querySelectorAll2**: This approach is similar to `querySelectorAll`, but with a more specific selector that only matches elements whose `name` attribute has the value "unique". This can be faster than `getElementsByName` because it avoids iterating over all elements. **Pros and Cons** * **getElementsByName**: + Pros: Simple and easy to understand. + Cons: Can be slow due to iteration, and may return null values if an element does not have a `name` attribute. * **querySelectorAll**: + Pros: Can be efficient for CSS-aware browsers. + Cons: Requires knowledge of CSS syntax, may not work in older browsers. * **querySelectorAll2**: + Pros: Faster than `getElementsByName`, and more specific selector that only matches desired elements. + Cons: Requires some knowledge of CSS selectors. **Library** There is no library explicitly mentioned in the benchmark, but it uses the `document` object, which is a built-in part of JavaScript. However, if we consider the HTML document structure, it relies on the DOM (Document Object Model) library to parse and manipulate the HTML document. **Special JS Feature/Syntax** The benchmark does not use any special JavaScript features or syntax that are not widely supported by most browsers. It uses standard JavaScript constructs such as variables, loops, and array methods. **Alternatives** Other alternatives for retrieving elements from an HTML document in JavaScript include: * `getElementById` and `getElementsByTagName`: These methods allow you to retrieve a single element or all elements with a specific ID or tag name. * jQuery: A popular JavaScript library that provides a more concise and efficient way of manipulating the DOM. Note that these alternatives may have different performance characteristics depending on the browser, version of JavaScript, and other factors.
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