How to use click event index in js

The property in JavaScript that gets the position of the clicked element in the parent element is element.index. It is used to determine the position of a clicked element in a list or collection, such as setting a click event on a li list item and getting its index to determine the clicked item.

Usage of click event index in JavaScript

Click eventindex Attribute indicates the position of the triggered element in the parent element. In JavaScript, this property can be accessed via:

<code class="javascript">element.index</code>

Usage:

index The property is typically used to determine which element was clicked A position in a related list or collection. For example, the following code gets the index of a list item when it is clicked:

<code class="javascript">const listItems = document.querySelectorAll('li');

for (let i = 0; i < listItems.length; i++) {
  listItems[i].addEventListener('click', function() {
    console.log(this.index);
  });
}</code>

Advantages:

• Simplifies index access to elements in a list or collection.
• Useful when you need to determine the position of the clicked element within its sibling elements.

Disadvantages:

• Only when the parent element is an ordered list (ol) or div Available when using other elements.
• For nested lists or complex DOM structures, it may be difficult to accurately determine the index.

Other notes:

• index The attribute does not work for full page click events.
• When elements are removed or rearranged, the index property will be updated accordingly.
• For lists with custom styles, the index property may return incorrect values.

The above is the detailed content of How to use click event index in js. For more information, please follow other related articles on the PHP Chinese website!