Vue implements cancellation event bubbling behavior

In Vue, event bubbling is a very common behavior, but sometimes we need to cancel the event bubbling behavior. This article will introduce how to use Vue to implement cancellation event bubbling behavior.

Event bubbling

Event bubbling is when an element triggers a certain event, the event will bubble up layer by layer until it is captured by a parent element. For example, when we click the mouse on a button, the click event of the button will be triggered, and then the click event of its parent element will also be triggered, followed by the click event of the upper element until the click event on the Document object is triggered. until triggered or the event is cancelled.

We can use event delegation to intercept events and prevent them from bubbling up to parent elements.

Cancel event bubbling

Sometimes, we need to cancel the bubbling behavior of an event so that it will not be passed to the upper element. In Vue, we can achieve this through event modifiers.

In Vue, event modifiers are special tags suffixed after the event name, which can change the behavior of the event. Among them, the .stop modifier can stop event bubbling so that the event is no longer passed to the upper element.

Sample code:

<div @click.stop="divClickHandler">
  <button @click="btnClickHandler">Button</button>
</div>

In this example, the click event of the button will be triggered when the button is clicked. However, in Vue, the event will bubble up to the upper elements layer by layer. However, since we added the .stop modifier on the div element containing the button, only the click event of the button will be triggered when the button is clicked, instead of bubbling upward.

In addition to the .stop modifier, there are other event modifiers that can be used. For example, the .prevent modifier can prevent the default behavior of the event, and the .capture modifier can cause the event to start capturing from the upper element instead of bubbling from the lower element.

Summary

In Vue, it is very convenient to cancel event bubbling behavior through event modifiers. The .stop modifier can stop event bubbling, and other modifiers can also achieve more flexible event control. When we need to control event bubbling in Vue, we can use the above method to achieve it.

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