Cancel event bubbling uniapp

With the continuous development of front-end technology, modern web applications are becoming more and more complex. To be able to handle the various events that end users may perform, developers must master some core concepts such as event capturing, bubbling, and delegation.

In this article, we will focus on the concept of "event bubbling" and explore how to cancel event bubbling in uniapp.

What is event bubbling?

Before we delve into how to cancel event bubbling, let us first understand what event bubbling is.

Event bubbling means that the event is triggered starting from the deepest element, and then reaching its ancestor elements step by step until it reaches the document root node. This way of delivering events is called bubbling because it is similar to the process of bubbles rising to the surface of water.

For example, consider the following HTML document:

<div>
  <ul>
    <li>项目1</li>
    <li>项目2</li>
    <li>项目3</li>
  </ul>
</div>

Suppose the user clicks the mouse on list item 1, which will trigger a click event. According to the principle of event bubbling, the click event will propagate from the li element, up to the div element, and finally reach the document root node. At each level, event listeners can be added to relevant elements to execute code when an event fires.

Why do you want to cancel event bubbling?

Sometimes you may want to stop the bubbling delivery of an event after it fires. This happens when you act based on specific conditions. For example, in the example above, if you want to do something outside of the list itself after clicking a list item, you need to cancel the bubbling delivery of the click event.

Cancel event bubbling in uniapp

It is very easy to cancel event bubbling delivery in uniapp. You can use the event object's stopPropagation() method to stop the event from bubbling up the DOM tree.

For vue simple template syntax, you can add event listeners to elements in the following ways:

<template>
  <div @click="handleButtonClick">
    <button @click.stop>点击</button>
  </div>
</template>

In the above example, when the user clicks the button, the click event is triggered and propagated Click event to the button's ancestor element. However, since we used the .stop modifier on the button, the event will not continue to propagate. This eliminates the need to check for specific conditions that indicate you want to prevent events from bubbling up.

It should be noted that using the stopPropagation() method will prevent the event from bubbling, but it will not stop the default behavior of the event. If you need to also stop the default behavior from occurring, use the event object's preventDefault() method.

Summary

In this article, we introduced the concept of event bubbling and explored how to cancel event bubbling in uniapp. You can use the event object's stopPropagation() method to stop the event from bubbling up the DOM tree. This allows you to abort event bubbling when certain conditions are met, allowing you to perform other actions without disrupting your application.

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