What is Capture Mode On An Event Listener

The `.capture` modifier in Vue.js is used to set the event listener to capture mode rather than the default bubbling mode.

Here’s a breakdown of what that means:

Event Propagation in the DOM

In the DOM, events can propagate in two phases:
1. Capture Phase: The event starts from the root and travels down to the target element.
2. Bubble Phase: After reaching the target element, the event bubbles up back to the root.

By default, Vue (like most other frameworks and the DOM itself) listens for events during the bubble phase. This means that if you have a parent and a child element, and you click on the child, the event will first trigger on the child element and then bubble up to the parent.

Using `.capture`

When you use the `.capture` modifier, you’re telling Vue to listen for the event during the capture phase instead. This means the event handler on the parent element will be invoked before the event reaches the child element.

Example Scenario

Suppose you have the following HTML structure:

<div v-on:click.capture="parentClickHandler">
           <button v-on:click="childClickHandler">Click Me</button>
       </div>

In This Case

When you click the button, `parentClickHandler` will be called before `childClickHandler` because the parent element is listening in the capture phase.
If you had omitted `.capture`, `childClickHandler` would be executed first, followed by `parentClickHandler` as the event bubbles up.

Why Use `.capture`?

Using `.capture` can be useful in situations where:

You need to handle an event before it reaches any child elements.
You want to intercept the event early for certain logic or to prevent further propagation.

It provides a way to handle events in a specific phase of the event lifecycle, giving you more control over event management in complex applications.