Benchmark: Setting input placeholders

HTML Preparation code:

<form>

  <input type="text"/>
  <input type="radio"/>
  <input type="checkbox"/>
  <textarea></textarea>

  <input class="required" type="text"/>
  <input class="required" type="radio"/>
  <input class="required" type="checkbox"/>
  <textarea class="required"></textarea>

</form>

Tests:

Intelligent selectors - not stored
$(':input:not(.required)') .prop('placeholder', ''); $(':input.required') .prop('placeholder', 'required');
Intelligent selectors, in filter, with .end
$(':input') .filter(':not(.required)') .prop('placeholder', '') .end() .filter('.required') .prop('placeholder', 'required');
Filter by function with .end
$(':input') .filter(function() { return !$(this).hasClass('required'); }) .prop('placeholder', '') .end() .filter(function() { return $(this).hasClass('required'); }) .prop('placeholder', 'required');
Intelligent selectors in filter - stored
var $inputs = $(':input'); $inputs .filter(':not(.required)') .prop('placeholder', ''); $inputs .filter('.required') .prop('placeholder', 'required');
Clear all, set only required
var $inputs = $(':input'); $inputs .prop('placeholder', ''); $inputs .filter('.required') .prop('placeholder', 'required');

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Intelligent selectors - not stored
Intelligent selectors, in filter, with .end
Filter by function with .end
Intelligent selectors in filter - stored
Clear all, set only required

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.

Let's dive into the explanation.

**Benchmark Description**

The benchmark is designed to measure how fast different JavaScript approaches can set and clear placeholders on input elements, which are assumed to be present in a form. The goal is to compare the performance of various methods for selecting elements, clearing their placeholder values, and then setting new placeholder values for specific inputs (those with the class "required").

**Options Compared**

The benchmark compares four different approaches:

1. **Intelligent selectors - not stored**: This method uses jQuery's `$(':input:not(.required)')` to select all input elements that don't have the "required" class, clear their placeholder values using `.prop('placeholder', '')`, and then set new placeholder values for inputs with the "required" class using `.prop('placeholder', 'required')`.
2. **Intelligent selectors in filter, with .end**: Similar to the previous method, but uses a filter function within the `$.filter()` method, followed by another filter function with `.end()`. This approach is slightly more complex.
3. **Intelligent selectors in filter - stored**: In this method, a variable `$inputs` is assigned once before executing multiple filter operations on it. The first filter operation clears placeholder values for all non-required inputs, and the second filter operation sets new placeholder values only for required inputs.
4. **Clear all, set only required**: This approach simply clears placeholder values for all input elements using `.prop('placeholder', '')` and then sets new placeholder values only for inputs with the "required" class.

**Pros and Cons of Each Approach**

Here's a brief summary:

*   Intelligent selectors - not stored: Simple, easy to understand. May incur overhead due to repeated execution.
*   Intelligent selectors in filter, with .end: Complex, may be slower due to nested operations.
*   Intelligent selectors in filter - stored: Efficient by caching the `$inputs` variable, but may require more memory for each iteration.
*   Clear all, set only required: Simple and straightforward. May not perform as well due to unnecessary work on non-required inputs.

**Library and Purpose**

In this benchmark, jQuery is used extensively for its convenience and performance. The library provides various methods (e.g., `':input:not(.required)')`) that allow efficient element selection, manipulation, and filtering.

**Special JavaScript Features or Syntax**

The benchmark uses several advanced features, such as:

*   **Filter functions**: Used in Intelligent selectors, in filter, with .end and Filter by function with .end approaches.
*   **$.filter()**: A method used for filtering elements within the context of a jQuery object.
*   **`.prop()`**: A method used to dynamically access or modify property values on an element.

**Alternatives**

If you're interested in exploring alternative approaches, consider:

*   Vanilla JavaScript methods (e.g., `document.querySelectorAll`) without using jQuery
*   Other libraries like Lodash for more advanced filtering and mapping operations

For most cases, the benchmark's Intelligent selectors - not stored and Clear all, set only required approaches would be suitable options.

Related benchmarks:

Setting input placeholders (version: 3)

Setting and clearing placeholders on a lot of elements at once

Comparing performance of: Intelligent selectors - not stored vs Intelligent selectors, in filter, with .end vs Filter by function with .end vs Intelligent selectors in filter - stored vs Clear all, set only required

Created: 9 years ago by: Registered User

Jump to the latest result

Intelligent selectors - not stored

Intelligent selectors, in filter, with .end

Filter by function with .end

Intelligent selectors in filter - stored

Clear all, set only required

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):