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EventListener in parent vs EventListener in childs
(version: 0)
Comparing performance of:
Parent listener vs Child listeners
Created:
4 years ago
by:
Guest
Jump to the latest result
HTML Preparation code:
<div id="parent"> <div>a</div> <div>b</div> <div>c</div> <div>e</div> <div>f</div> <div>g</div> <div>h</div> <div>i</div> <div>j</div> <div>k</div> <div>a</div> <div>b</div> <div>c</div> <div>e</div> <div>f</div> <div>g</div> <div>h</div> <div>i</div> <div>j</div> <div>k</div> <div>a</div> <div>b</div> <div>c</div> <div>e</div> <div>f</div> <div>g</div> <div>h</div> <div>i</div> <div>j</div> <div>k</div> <div>a</div> <div>b</div> <div>c</div> <div>e</div> <div>f</div> <div>g</div> <div>h</div> <div>i</div> <div>j</div> <div>k</div> <div>a</div> <div>b</div> <div>c</div> <div>e</div> <div>f</div> <div>g</div> <div>h</div> <div>i</div> <div>j</div> <div>k</div> <div>a</div> <div>b</div> <div>c</div> <div>e</div> <div>f</div> <div>g</div> <div>h</div> <div>i</div> <div>j</div> <div>k</div> <div>a</div> <div>b</div> <div>c</div> <div>e</div> <div>f</div> <div>g</div> <div>h</div> <div>i</div> <div>j</div> <div>k</div> <div>a</div> <div>b</div> <div>c</div> <div>e</div> <div>f</div> <div>g</div> <div>h</div> <div>i</div> <div>j</div> <div>k</div> <div>a</div> <div>b</div> <div>c</div> <div>e</div> <div>f</div> <div>g</div> <div>h</div> <div>i</div> <div>j</div> <div>k</div> <div>a</div> <div>b</div> <div>c</div> <div>e</div> <div>f</div> <div>g</div> <div>h</div> <div>i</div> <div>j</div> <div>k</div> </div>
Script Preparation code:
var parent = document.getElementById("parent"); var text ="";
Tests:
Parent listener
parent.addEventListener("click", (e)=>{ text = e.target.textContent; });
Child listeners
for(var children of parent.children){ children.addEventListener("click",(e)=>{ text = e.target.textContent; }) }
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
Previous results
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Test case name
Result
Parent listener
Child listeners
Fastest:
N/A
Slowest:
N/A
Latest run results:
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Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Let's break down the benchmark and its various components. **Benchmark Definition** The benchmark is comparing two approaches to attach event listeners: 1. **Parent listener**: Attaching an event listener directly to the parent element using `addEventListener`. 2. **Child listeners**: Attaching event listeners to each child element individually using a `for` loop and `addEventListener`. **Options being compared** In this case, we're only comparing two options. * Parent listener * Child listeners **Pros and Cons of each approach** 1. **Parent listener** * Pros: + Simpler code structure + Less overhead since only one event listener is attached to the parent element * Cons: + May lead to a slower response time if the child elements are not directly accessible (e.g., due to CSS layout or animation) 2. **Child listeners** * Pros: + Can handle cases where child elements need to be accessed separately (e.g., for animations or transformations) * Cons: + More complex code structure + Higher overhead since multiple event listeners are attached to each child element **Library** There is no explicit library mentioned in the benchmark definition. However, it's likely that the `addEventListener` method is used, which is a part of the HTML5 specification and is supported by most modern browsers. **Special JS feature/syntax** None are explicitly mentioned in this benchmark. The code uses standard JavaScript syntax, including `addEventListener`, `forEach`, and template literals. **Other alternatives** If we were to consider alternative approaches: * **Using event delegation**: Instead of attaching separate event listeners to each child element, we could use event delegation by attaching a single event listener to the parent element and then using the `event.target` property to determine which child element was clicked. * **Using a library or framework**: Depending on the specific requirements of the project, a library like jQuery or a framework like React might provide optimized solutions for handling events in complex DOM structures. The current benchmark provides a simple and straightforward comparison between two approaches. Adding additional alternatives would require more complexity and potentially introduce new variables that could affect the outcome of the benchmark.
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