如何通过Vue实现@人的功能

本文采用vue，同时增加鼠标点击事件和一些页面小优化

基本结构

新建一个sandBox.vue文件编写功能的基本结构

 <div class="content">
    <!--文本框-->
    <div
      class="editor"
      ref="divRef"
      contenteditable
      @keyup="handkeKeyUp"
      @keydown="handleKeyDown"
    ></div>
    <!--选项-->
    <AtDialog
      v-if="showDialog"
      :visible="showDialog"
      :position="position"
      :queryString="queryString"
      @onPickUser="handlePickUser"
      @onHide="handleHide"
      @onShow="handleShow"
    ></AtDialog>
  </div>
<script>
import AtDialog from '../components/AtDialog'
export default {
  name: 'sandBox',
  components: { AtDialog },
  data () {
    return {
      node: '', // 获取到节点
      user: '', // 选中项的内容
      endIndex: '', // 光标最后停留位置
      queryString: '', // 搜索值
      showDialog: false, // 是否显示弹窗
      position: {
        x: 0,
        y: 0
      }// 弹窗显示位置
    }
  },
  methods: {
    // 获取光标位置
    getCursorIndex () {
      const selection = window.getSelection()
      return selection.focusOffset // 选择开始处 focusNode 的偏移量
    },
    // 获取节点
    getRangeNode () {
      const selection = window.getSelection()
      return selection.focusNode // 选择的结束节点
    },
    // 弹窗出现的位置
    getRangeRect () {
      const selection = window.getSelection()
      const range = selection.getRangeAt(0) // 是用于管理选择范围的通用对象
      const rect = range.getClientRects()[0] // 择一些文本并将获得所选文本的范围
      const LINE_HEIGHT = 30
      return {
        x: rect.x,
        y: rect.y + LINE_HEIGHT
      }
    },
    // 是否展示 @
    showAt () {
      const node = this.getRangeNode()
      if (!node || node.nodeType !== Node.TEXT_NODE) return false
      const content = node.textContent || ''
      const regx = /@([^@\s]*)$/
      const match = regx.exec(content.slice(0, this.getCursorIndex()))
      return match && match.length === 2
    },
    // 获取 @ 用户
    getAtUser () {
      const content = this.getRangeNode().textContent || ''
      const regx = /@([^@\s]*)$/
      const match = regx.exec(content.slice(0, this.getCursorIndex()))
      if (match && match.length === 2) {
        return match[1]
      }
      return undefined
    },
    // 创建标签
    createAtButton (user) {
      const btn = document.createElement('span')
      btn.style.display = 'inline-block'
      btn.dataset.user = JSON.stringify(user)
      btn.className = 'at-button'
      btn.contentEditable = 'false'
      btn.textContent = `@${user.name}`
      const wrapper = document.createElement('span')
      wrapper.style.display = 'inline-block'
      wrapper.contentEditable = 'false'
      const spaceElem = document.createElement('span')
      spaceElem.style.whiteSpace = 'pre'
      spaceElem.textContent = '\u200b'
      spaceElem.contentEditable = 'false'
      const clonedSpaceElem = spaceElem.cloneNode(true)
      wrapper.appendChild(spaceElem)
      wrapper.appendChild(btn)
      wrapper.appendChild(clonedSpaceElem)
      return wrapper
    },
    replaceString (raw, replacer) {
      return raw.replace(/@([^@\s]*)$/, replacer)
    },
    // 插入@标签
    replaceAtUser (user) {
      const node = this.node
      if (node && user) {
        const content = node.textContent || ''
        const endIndex = this.endIndex
        const preSlice = this.replaceString(content.slice(0, endIndex), '')
        const restSlice = content.slice(endIndex)
        const parentNode = node.parentNode
        const nextNode = node.nextSibling
        const previousTextNode = new Text(preSlice)
        const nextTextNode = new Text('\u200b' + restSlice) // 添加 0 宽字符
        const atButton = this.createAtButton(user)
        parentNode.removeChild(node)
        // 插在文本框中
        if (nextNode) {
          parentNode.insertBefore(previousTextNode, nextNode)
          parentNode.insertBefore(atButton, nextNode)
          parentNode.insertBefore(nextTextNode, nextNode)
        } else {
          parentNode.appendChild(previousTextNode)
          parentNode.appendChild(atButton)
          parentNode.appendChild(nextTextNode)
        }
        // 重置光标的位置
        const range = new Range()
        const selection = window.getSelection()
        range.setStart(nextTextNode, 0)
        range.setEnd(nextTextNode, 0)
        selection.removeAllRanges()
        selection.addRange(range)
      }
    },
    // 键盘抬起事件
    handkeKeyUp () {
      if (this.showAt()) {
        const node = this.getRangeNode()
        const endIndex = this.getCursorIndex()
        this.node = node
        this.endIndex = endIndex
        this.position = this.getRangeRect()
        this.queryString = this.getAtUser() || ''
        this.showDialog = true
      } else {
        this.showDialog = false
      }
    },
    // 键盘按下事件
    handleKeyDown (e) {
      if (this.showDialog) {
        if (e.code === 'ArrowUp' ||
          e.code === 'ArrowDown' ||
          e.code === 'Enter') {
          e.preventDefault()
        }
      }
    },
    // 插入标签后隐藏选择框
    handlePickUser (user) {
      this.replaceAtUser(user)
      this.user = user
      this.showDialog = false
    },
    // 隐藏选择框
    handleHide () {
      this.showDialog = false
    },
    // 显示选择框
    handleShow () {
      this.showDialog = true
    }
  }
}
</script>

<style scoped lang="scss">
  .content {
    font-family: sans-serif;
    h1{
      text-align: center;
    }
  }
  .editor {
    margin: 0 auto;
    width: 600px;
    height: 150px;
    background: #fff;
    border: 1px solid blue;
    border-radius: 5px;
    text-align: left;
    padding: 10px;
    overflow: auto;
    line-height: 30px;
    &:focus {
      outline: none;
    }
  }
</style>

如果添加了点击事件，节点和光标位置获取，需要在【键盘抬起事件】中获取，并保存到data

 // 键盘抬起事件
    handkeKeyUp () {
      if (this.showAt()) {
        const node = this.getRangeNode() // 获取节点
        const endIndex = this.getCursorIndex() // 获取光标位置
        this.node = node
        this.endIndex = endIndex
        this.position = this.getRangeRect()
        this.queryString = this.getAtUser() || ''
        this.showDialog = true
      } else {
        this.showDialog = false
      }
    },

新建一个组件，编辑弹窗选项 

<template>
<div
  class="wrapper"
  :style="{position:'fixed',top:position.y +'px',left:position.x+'px'}">
  <div v-if="!mockList.length" class="empty">无搜索结果</div>
  <div
    v-for="(item,i) in mockList"
    :key="item.id"
    class="item"
    :class="{'active': i === index}"
    ref="usersRef"
    @click="clickAt($event,item)"
    @mouseenter="hoverAt(i)"
  >
    <div class="name">{{item.name}}</div>
  </div>
</div>
</template>

<script>
const mockData = [
  { name: 'HTML', id: 'HTML' },
  { name: 'CSS', id: 'CSS' },
  { name: 'Java', id: 'Java' },
  { name: 'JavaScript', id: 'JavaScript' }
]
export default {
  name: 'AtDialog',
  props: {
    visible: Boolean,
    position: Object,
    queryString: String
  },
  data () {
    return {
      users: [],
      index: -1,
      mockList: mockData
    }
  },
  watch: {
    queryString (val) {
      val ? this.mockList = mockData.filter(({ name }) => name.startsWith(val)) : this.mockList = mockData.slice(0)
    }
  },
  mounted () {
    document.addEventListener('keyup', this.keyDownHandler)
  },
  destroyed () {
    document.removeEventListener('keyup', this.keyDownHandler)
  },
  methods: {
    keyDownHandler (e) {
      if (e.code === 'Escape') {
        this.$emit('onHide')
        return
      }
      // 键盘按下 => ↓
      if (e.code === 'ArrowDown') {
        if (this.index >= this.mockList.length - 1) {
          this.index = 0
        } else {
          this.index = this.index + 1
        }
      }
      // 键盘按下 => ↑
      if (e.code === 'ArrowUp') {
        if (this.index <= 0) {
          this.index = this.mockList.length - 1
        } else {
          this.index = this.index - 1
        }
      }
      // 键盘按下 => 回车
      if (e.code === 'Enter') {
        if (this.mockList.length) {
          const user = {
            name: this.mockList[this.index].name,
            id: this.mockList[this.index].id
          }
          this.$emit('onPickUser', user)
          this.index = -1
        }
      }
    },
    clickAt (e, item) {
      const user = {
        name: item.name,
        id: item.id
      }
      this.$emit('onPickUser', user)
      this.index = -1
    },
    hoverAt (index) {
      this.index = index
    }
  }
}
</script>

<style scoped lang="scss">
  .wrapper {
    width: 238px;
    border: 1px solid #e4e7ed;
    border-radius: 4px;
    background-color: #fff;
    box-shadow: 0 2px 12px 0 rgb(0 0 0 / 10%);
    box-sizing: border-box;
    padding: 6px 0;
  }
  .empty{
    font-size: 14px;
    padding: 0 20px;
    color: #999;
  }
  .item {
    font-size: 14px;
    padding: 0 20px;
    line-height: 34px;
    cursor: pointer;
    color: #606266;
    &.active {
      background: #f5f7fa;
      color: blue;
      .id {
        color: blue;
      }
    }
    &:first-child {
      border-radius: 5px 5px 0 0;
    }
    &:last-child {
      border-radius: 0 0 5px 5px;
    }
    .id {
      font-size: 12px;
      color: rgb(83, 81, 81);
    }
  }
</style>

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