为什么 '@drop' 事件在 vue 中对我不起作用?

问题描述

@drop 监听器对我不起作用.它不会调用我要它调用的方法.

我想拖动芯片并能够将其放到另一个组件上，并执行一个功能，但是在放置芯片的时候，没有执行dropLink方法，所以我假设未发出 @drop 事件.

控制台上没有显示错误.

其余事件运行良好，例如 @dragstart.

这是我使用的组件的代码:

</模板><脚本>导出默认{name: 'ItemArticle',道具: {文章: {类型:对象，要求:真实}},计算:{链接(){返回 this.article.links}},方法: {mouseUp(事件，文章){this.$emit('mouseUp', { event, article })},preventKey (keydown) {this.$emit('preventKey', keydown)},dragChipToLinkToAnotherElement(事件){event.dataTransfer.setData('text/plain', this.article.id)},dropLink (e) {//但是这个方法永远不会被调用console.log('evento drop is ok', e)}}}

在项目中我也使用 Nuxt 以防万一.

解决方案

为了使 div 成为放置目标，div 的 dragenter 和 dragover 事件必须取消.您可以调用 Event.preventDefault() 那些带有 .prevent 的事件 事件修饰符:

如果您需要根据拖动数据类型接受/拒绝放置，请设置一个有条件地调用 Event.preventDefault() 的处理程序:

export default {方法: {checkDrop(e) {if (/* 允许的数据类型 */) {e.preventDefault()}},}}

演示

The @drop listener doesn't work for me. It doesn't call the method I'm telling it to call.

I want to drag the chip and be able to drop it on another component, and perform a function, but at the time of dropping the chip, the dropLink method is not executed, so I assume that the @drop event is not emitted.

No errors are displayed on the console.

The rest of the events do work well, like @dragstart.

This is the code of the component I use:

<template>
  <div
    @keydown="preventKey"
    @drop="dropLink"
  >
    <template
      v-if="!article.isIndex"
    >
      <v-tooltip bottom>
        <template v-slot:activator="{ on }">
          <v-chip
            small
            draggable
            class="float-left mt-2"
            v-on="on"
            @dragstart="dragChipToLinkToAnotherElement"
          >
            <v-icon x-small>
              mdi-vector-link
            </v-icon>
          </v-chip>
        </template>
        <span>Link</span>
      </v-tooltip>

      <v-chip-group
        class="mb-n2"
        show-arrows
      >
        <v-chip
          v-for="(lk, index) in links"
          :key="index"
          small
          outlined
          :class="{'ml-auto': index === 0}"
        >
          {{ lk.text }}
        </v-chip>
      </v-chip-group>
    </template>

    <div
      :id="article.id"
      spellcheck="false"
      @mouseup="mouseUp($event, article)"
      v-html="article.con"
    />
  </div>
</template>

<script>
export default {
  name: 'ItemArticle',
  props: {
    article: {
      type: Object,
      required: true
    }
  },
  computed: {
    links () {
      return this.article.links
    }
  },
  methods: {
    mouseUp (event, article) {
      this.$emit('mouseUp', { event, article })
    },
    preventKey (keydown) {
      this.$emit('preventKey', keydown)
    },
    dragChipToLinkToAnotherElement (event) {
      event.dataTransfer.setData('text/plain', this.article.id)
    },
    dropLink (e) {
      //but this method is never called
      console.log('evento drop is ok', e)
    }
  }
}
</script>

In the project I am also using Nuxt in case that is relevant.

解决方案

In order to make the div a drop target, the div's dragenter and dragover events must be canceled. You can invoke Event.preventDefault() on those events with the .prevent event modifier:

<div @drop="dropLink" @dragenter.prevent @dragover.prevent></div>

If you need to accept/reject drops based on the drag data type, set a handler that conditionally calls Event.preventDefault():

<div @drop="dropLink" @dragenter="checkDrop" @dragover="checkDrop"></div>

export default {
  methods: {
    checkDrop(e) {
      if (/* allowed data type */) {
        e.preventDefault()
      }
    },
  }
}

demo

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