What is the optimal choice for improving performance between utilizing jQuery to select class names versus id attributes?

I am working on an accordion menu with many div elements, each of which has its own unique id like:

<div id='sampe_1' class='sample'></div>
<div id='sampe_2' class='sample'></div>
<div id='sampe_3' class='sample'></div>

<div id='sampe_100' class='sample'></div>

For expanding and collapsing these divs, I have been using two different methods:

$("div[id^='sample_']"); This allows me to select all 100 divs at once. Then I loop through them and trigger the click event.

Alternatively,

I can directly apply a click event using the class name like so:

$('.sample').on('click');

Out of these two methods, I am wondering which one is better or if there is a more efficient approach?

Answer №1

The speed difference between using $('.example').on('click'); and using id's is significant. When binding the click event to a DOM element with id's, a RegEx must be executed for each element, whereas with classes, all elements are simply collected by their class name. As a result, there is no comparison needed when attaching the click event to the DOM element.

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