How to implement mouse long press effect in Vue?

Vue is a very popular front-end framework, and during the development process, some common user interaction effects are often involved, such as the mouse long-press effect. In Vue, we can achieve the long-press effect of the mouse through some simple methods. Let me talk about the specific operations below.

The first step is to add a mousedown event in the Vue component and define a variable timer in it to record the time when the mouse is pressed:

<template>
  <div @mousedown="startTimer" @mouseup="clearTimer">按住我</div>
</template>

<script>
  export default {
    data() {
      return {
        timer: null
      }
    },
    methods: {
      startTimer() {
        this.timer = setTimeout(() => {
          console.log('长按事件触发')
        }, 1000)
      },
      clearTimer() {
        clearTimeout(this.timer)
      }
    }
  }
</script>

In the above code, We define a startTimer method to respond to mouse press events. In this method, we use the setTimeout method to set a timer and assign it to the timer variable. After the timer is executed, the callback function of the long press event will be triggered, thus realizing the long press effect of the mouse.

However, we also need to clear the timer in the mouseup event, otherwise the long press event will continue to execute after the mouse is released. This requires us to define a clearTimer method to clear the timer.

If we want to perform some specific operations in the long press event, such as displaying a menu or popping up a prompt box, we only need to add the corresponding code in the callback function. For example:

startTimer() {
  this.timer = setTimeout(() => {
    console.log('长按事件触发')
    alert('您按下了鼠标超过 1 秒钟')
  }, 1000)
}

The above code will pop up a prompt box when the long press event is triggered, telling the user that the mouse has been pressed for more than 1 second.

Finally, what we need to note is that if we use the long press event on the mobile terminal, we need to change the mousedown event to the touchstart event and the mouseup event to the touchend event to ensure that the long press event can be triggered normally on the mobile device. Press event.

To sum up, the method of implementing mouse long press event in Vue is very simple. You only need to define a timer, determine whether the long press event is triggered within a certain period of time, and clear the timer at the end.

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