What is the event object in vue

Event objects in Vue.js contain properties and methods about the event, which can be accessed through event handler functions. These properties include the event type, target element, and original event object. The event object also provides methods to prevent the default behavior and event bubbling. Additionally, data can be passed to custom events via the detail attribute, allowing complex information to be propagated and received between components.

Event object in Vue

The event object in Vue.js is a special object that contains Various properties and methods related to events. When an element fires an event, Vue creates an event object and passes it to the event handler.

Event object properties

The following are some common event object properties:

• type:The event is triggered Type, such as "click" or "keyup".
• target: The element that triggers the event.
• currentTarget: The element currently handling the event.
• event: Original browser event object.
• detail: Custom event data.

Event object methods

The event object also provides the following methods:

• preventDefault():Block default browser behavior.
• stopPropagation(): Prevent events from bubbling up to ancestor elements.
• stopImmediatePropagation(): Immediately stop event bubbling and propagation.

Using the event object

In order to use the event object in Vue, you can access it in the event handler function. For example:

<code><button @click="handleClick">点击我</button>

<script>
export default {
  methods: {
    handleClick(event) {
      console.log(event.type); // "click"
      console.log(event.target); // HTMLButtonElement
      event.preventDefault();
    }
  }
}
</script></code>

In the above example, the handleClick function provides an event object as its parameter. You can use this object to access information such as the event's type, target element, and more.

Custom event data

You can pass data to a custom event through the detail attribute. For example:

<code><my-component @custom-event="handleEvent">
  <button @click="emitEvent">触发事件</button>
</my-component>

<script>
export default {
  methods: {
    emitEvent() {
      this.$emit('custom-event', { message: '你好，世界！' });
    },
    handleEvent(event) {
      console.log(event.detail.message); // "你好，世界！"
    }
  }
}
</script></code>

This allows you to propagate and receive arbitrary data along with events.

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