Benchmark: jQuery by id vs Document.getElementById

HTML Preparation code:

<script type="text/javascript" src="http://ajax.aspnetcdn.com/ajax/jQuery/jquery-3.1.0.min.js"></script>
<div id="testElement"></div>

Script Preparation code:

function W() {
  this.a = document.getElementById('testElement'); 
}
W.prototype.getNode = function() {
  return this.a; 
}
var p = new W();

Tests:

jQuery
console.log('jQuery', !!$("#testElement").length);
getElementById
console.log('getElementById', !!document.getElementById('testElement'));
Contains
console.log('Contains:',document.contains(p.getNode()))

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
jQuery
getElementById
Contains

Fastest: N/A

Slowest: N/A

Latest run results:

No previous run results

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Autogenerated LLM Summary (model llama3.2:3b, generated one year ago):

LLMs can make mistakes. Check important info.

**Benchmark Overview**

MeasureThat.net is a website that allows users to create and run JavaScript microbenchmarks, comparing the performance of different approaches and libraries. The benchmark in question compares the speed of getting an element by ID using jQuery versus Vanilla JS (i.e., without any additional libraries).

**Script Preparation Code**

The script preparation code defines a class `W` with two methods: `getNode()` and the constructor. `getNode()` returns the result of calling `document.getElementById('testElement')`, which is assigned to the instance variable `a`. The constructor initializes this variable.

**Html Preparation Code**

The HTML preparation code includes a `<div>` element with an ID of "testElement", which will be used as the target element for the benchmark.

**Individual Test Cases**

There are three test cases:

1. **jQuery**: This test case uses jQuery to get the length of the `#testElement` element and logs it to the console.
2. **getElementById**: This test case uses Vanilla JS (i.e., without any additional libraries) to get the element with ID "testElement" using `document.getElementById()` and logs its existence to the console.
3. **Contains**: This test case checks if the document contains the result of calling `p.getNode()`, which returns the element with ID "testElement". The purpose of this test is not entirely clear, but it may be related to checking if the element is still in the DOM after the benchmark has run.

**Library: jQuery**

jQuery is a popular JavaScript library that simplifies DOM manipulation and event handling. In this benchmark, jQuery is used to get the length of the `#testElement` element using `$(" #testElement").length`. This approach allows for easy selection of elements by ID, but it also introduces an additional layer of complexity and overhead.

**Vanilla JS**

Vanilla JS refers to JavaScript without any additional libraries or frameworks. In this benchmark, Vanilla JS is used to get the element with ID "testElement" using `document.getElementById('testElement')`. This approach provides direct access to the DOM elements and is often preferred for simple cases, but it may not be as convenient or efficient as using a library like jQuery.

**Special JS Feature: ES6 Classes**

The benchmark uses ES6 classes (a syntax introduced in ECMAScript 2015) to define the `W` class. This feature allows for more concise and expressive code, making it easier to write object-oriented JavaScript programs. However, it may not be supported by older browsers or versions of JavaScript.

**Other Considerations**

* **DOM traversal**: The benchmark does not include any DOM traversal operations, such as walking the DOM tree or querying elements using multiple selectors.
* **Event handling**: The benchmark does not handle events or other asynchronous tasks that can impact performance.
* **Memory usage**: The benchmark does not consider memory usage or allocation, which can be an important factor in JavaScript performance.

**Alternatives**

If you want to create a similar benchmark, you could use alternative libraries or approaches. Some options include:

* Using a different library, such as Lodash or Moment.js, for DOM manipulation and event handling.
* Implementing the `contains` test case using a more lightweight approach, such as checking if the element is present in the DOM using `document.contains()`.
* Adding additional features to the benchmark, such as supporting multiple browsers or platforms, or including more complex DOM traversal operations.

Related benchmarks:

jQuery by id vs Document.getElementById (version: 0)

Comparing speed of getting element by id with jQuery vs Vanilla JS

Comparing performance of: jQuery vs getElementById vs Contains

Created: 8 years ago by: Guest

Jump to the latest result

jQuery

getElementById

Contains

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

No previous run results

Autogenerated LLM Summary (model llama3.2:3b, generated one year ago):