How to implement event monitoring such as click, double-click, and long press in Vue?

In Vue, we can use the v-on directive to listen for events on DOM elements. However, in actual development, we may need to monitor more complex events, such as single click, double click, long press, etc. At this time, using v-on seems a bit inadequate.

So, how to implement monitoring of these events in Vue? This article will explain it to you in detail.

1. Click event monitoring

Click events are very common in applications. Vue provides v-on:click abbreviation @click to monitor click events:

<template>
  <button @click="handleClick">单击我</button>
</template>
<script>
export default {
  methods: {
    handleClick() {
      console.log('单击了按钮！');
    }
  }
}
</script>

In the above code, we added a @click event listener to the button and bound it to a method named handleClick.

In addition to the above methods, we can also use the modifiers provided by Vue to extend the click event. For example, to prevent event bubbling:

<template>
  <div @click.stop="handleClickParent">
    <button @click.stop="handleClickChild">单击我</button>
  </div>
</template>
<script>
export default {
  methods: {
    handleClickParent() {
      console.log('父元素单击了！');
    },
    handleClickChild() {
      console.log('子元素单击了！');
    }
  }
}
</script>

In the above code, we bind click events to the parent element and child element respectively, and use the @click.stop modifier to prevent the event from bubbling. In this way, when we click on a child element, only the click event of the child element will be triggered, and the click event of the parent element will not be triggered.

2. Double-click event monitoring

If we need to monitor double-click events, Vue does not provide a direct solution. But we can use the setTimeout and clearTimeout methods to monitor double-click events:

<template>
  <button @click="handleClick" @dblclick="handleDoubleClick">单击或双击我</button>
</template>
<script>
export default {
  data() {
    return {
      timer: null  // 定义一个计时器
    }
  },
  methods: {
    handleClick() {
      this.timer = setTimeout(() => {
        console.log('单击了按钮！');
        this.timer = null;
      }, 250);  // 250 毫秒内单击时触发单击事件
    },
    handleDoubleClick() {
      clearTimeout(this.timer);
      console.log('双击了按钮！');
      this.timer = null;
    }
  }
}
</script>

In the above code, we define a timer. When the user clicks the button, we start the timer and wait for 250 milliseconds. If the user clicks the button again within this time, we clear the timer and fire the double-click event.

3. Long press event monitoring

Similar to the double-click event, Vue does not provide a direct long press event monitoring solution. But you can also use the setTimeout and clearTimeout methods to monitor long press events:

<template>
  <button @mousedown="handleMouseDown" @mouseup="handleMouseUp" @touchstart="handleMouseDown" @touchend="handleMouseUp">长按我</button>
</template>
<script>
export default {
  data() {
    return {
      timer: null  // 定义一个计时器
    }
  },
  methods: {
    handleMouseDown() {
      this.timer = setTimeout(() => {
        this.timer = null;
        console.log('长按了按钮！');
      }, 1000);  // 1 秒钟之后触发长按事件
    },
    handleMouseUp() {
      clearTimeout(this.timer);
      this.timer = null;
    }
  }
}
</script>

In the above code, we bind mousedown and mouseup event listeners to the button. On the mobile side, we can also listen for touchstart and touchend event. When the user long presses the button, we start the timer and wait for 1 second. If the user releases the button within this time, we clear the timer and trigger the long press event; otherwise, we trigger the long press event.

4. Summary

This article mainly introduces how to implement event monitoring methods such as click, double-click, and long press in Vue. By using the v-on directive and some JS methods, we can easily listen to various complex events to provide a richer interactive experience for the application.

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