最近做一个vue前后端分离的项目，前端框架用element ui，在 使用 el-table 的过程中，需要实现行内编辑，效果大概是这样：

分为下面几个步骤：

（1） 自定义 el-table 的表头（即添加 “新增” 按钮）：

<el-table :data="propTableData.col.filter(data => handleAdd || data.name.toLowerCase().includes(handleAdd.toLowerCase()))"
          highlight-current-row
          border>
</el-table>

<template slot="header"
       slot-scope="scope">
      <el-button v-model="handleAdd"
             size="mini"
             type="success"
             round
             plain
             @click="handleAdd(scope.$index, scope.row)">{{ $t('common.add') }}</el-button>
</template>

表头自定义了一个“添加”按钮，点击 el-table 动态添加一行。

（2） el-table 动态添加一行：

let row = {
        code: '',
        maxValue: '',
        minValue: '',
        name: '',
        valueType: 'String',
        id: '',
        typeId: '',
        warning: false,
        isSet: true
}
this.propTableData.col.push(row)

vue 数据变化驱动 dom 进行更新，给 table 绑定的数据 propTableData.col 添加一个元素，则表格会添加一行。

propTableData.sel 保存当前行数据：

this.propTableData.sel = row

（3） el-table 动态删除一行：

子组件中触发父组件的 delete 事件：

this.$emit('delete', row.id)

（4）当前行状态判断，即是否处于编辑状态，控制表格每一行的按钮元素的移除与插入：

<template slot-scope="scope">
          <el-button size="mini"
                     type="primary"
                     round
                     plain
                     v-if="!scope.row.isSet"
                     @click="valChange(scope.row,scope.$index,true)">{{ $t('common.edit') }}</el-button>
          <el-button size="mini"
                     type="primary"
                     round
                     plain
                     v-else
                     @click="valChange(scope.row,scope.$index,true)">{{ $t('common.save') }}</el-button>
          <el-button size="mini"
                     type="danger"
                     round
                     plain
                     v-if="!scope.row.isSet"
                     @click="handleDelete(scope.$index, scope.row)">{{ $t('common.delete') }}</el-button>
          <el-button size="mini"
                     type="danger"
                     round
                     plain
                     v-else
                     @click="valChange(scope.row,scope.$index,false)">{{ $t('common.cancel') }}</el-button>
</template>

上面代码中，通过 v-if=“scope.row.isSet” 来判断当前行是否处于编辑状态。

如果当前行处于编辑状态，则按钮为“保存”和“取消”，此时可对当前行进行保存和取消操作，且不能新增，除非先保存当前行；

如果当前行处于非编辑状态，则按钮为“编辑”和“删除”状态，此时可对当前行进行编辑和删除操作。

这样，就可以实现 el-table 行内编辑的需求。

完整版代码如下：

<template>
  <el-dialog class="uiot-dialog"
             width="900px"
             :visible.sync="isShow"
             :before-close="beforeClose"
             :close-on-click-modal="false"
             :title="$t('basicData.device.propDlg.dlgTitle')"
             @open="open">
    <el-table :data="propTableData.col.filter(data => handleAdd || data.name.toLowerCase().includes(handleAdd.toLowerCase()))"
              highlight-current-row
              border>
      <el-table-column label="No."
                       type="index"
                       align="center"
                       width="50"></el-table-column>
      <el-table-column :label="$t('basicData.device.propDlg.code')">
        <template slot-scope="scope">
          <span v-if="scope.row.isSet">
            <el-input size="mini"
                      v-model="scope.row.code"></el-input>
          </span>
          <span v-else>{{ scope.row.code }}</span>
        </template>
      </el-table-column>
      <el-table-column :label="$t('basicData.device.propDlg.name')">
        <template slot-scope="scope">
          <span v-if="scope.row.isSet">
            <el-input size="mini"
                      v-model="scope.row.name"></el-input>
          </span>
          <span v-else>{{ scope.row.name }}</span>
        </template>
      </el-table-column>
      <el-table-column :label="$t('basicData.device.propDlg.minValue')">
        <template slot-scope="scope">
          <span v-if="scope.row.isSet">
            <el-input size="mini"
                      v-model="scope.row.minValue"></el-input>
          </span>
          <span v-else>{{ scope.row.minValue }}</span>
        </template>
      </el-table-column>
      <el-table-column :label="$t('basicData.device.propDlg.maxValue')">
        <template slot-scope="scope">
          <span v-if="scope.row.isSet">
            <el-input size="mini"
                      v-model="scope.row.maxValue"></el-input>
          </span>
          <span v-else>{{ scope.row.maxValue }}</span>
        </template>
      </el-table-column>
      <el-table-column :label="$t('basicData.device.propDlg.valueType')">
        <template slot-scope="scope">
          <span v-if="scope.row.isSet">
            <el-select size="mini"
                       v-model="scope.row.valueType"
                       :placeholder="$t('common.pleSelect')">
              <el-option v-for="item in valTypeOptions"
                         :key="item.value"
                         :label="item.label"
                         :value="item.value"></el-option>
            </el-select>
          </span>
          <span v-else>{{ scope.row.valueType }}</span>
        </template>
      </el-table-column>
      <el-table-column :label="$t('basicData.device.propDlg.warning')">
        <template slot-scope="scope">
          <span v-if="scope.row.isSet">
            <el-select v-model="scope.row.warning"
                       size="mini">
              <el-option v-for="item in warnOptions"
                         :key="item.value"
                         :label="item.label"
                         :value="item.value"></el-option>
            </el-select>
          </span>
          <span v-else>{{ scope.row.warning===true?'是':'否' }}</span>
        </template>
      </el-table-column>
      <el-table-column align="center"
                       width="170px">
        <template slot="header"
                  slot-scope="scope">
          <el-button v-model="handleAdd"
                     size="mini"
                     type="success"
                     round
                     plain
                     @click="handleAdd(scope.$index, scope.row)">{{ $t('common.add') }}</el-button>
        </template>
        <template slot-scope="scope">
          <el-button size="mini"
                     type="primary"
                     round
                     plain
                     v-if="!scope.row.isSet"
                     @click="valChange(scope.row,scope.$index,true)">{{ $t('common.edit') }}</el-button>
          <el-button size="mini"
                     type="primary"
                     round
                     plain
                     v-else
                     @click="valChange(scope.row,scope.$index,true)">{{ $t('common.save') }}</el-button>
          <el-button size="mini"
                     type="danger"
                     round
                     plain
                     v-if="!scope.row.isSet"
                     @click="handleDelete(scope.$index, scope.row)">{{ $t('common.delete') }}</el-button>
          <el-button size="mini"
                     type="danger"
                     round
                     plain
                     v-else
                     @click="valChange(scope.row,scope.$index,false)">{{ $t('common.cancel') }}</el-button>
        </template>
      </el-table-column>
    </el-table>
  </el-dialog>
</template>

<script>
import { open } from 'fs'
import '@/styles/uiot.scss'

const defaultProp = {
  code: '',
  maxValue: '',
  minValue: '',
  name: '',
  valueType: 'String',
  id: '',
  typeId: '',
  warning: false
}

export default {
  props: {
    isShow: Boolean,
    oneRow: {
      type: Array,
      default: function() {
        return defaultProp
      }
    }
  },
  data() {
    return {
      propTableData: {
        sel: null, // 选中行
        col: []
      },
      warnOptions: [
        {
          value: true,
          label: '是'
        },
        {
          value: false,
          label: '否'
        }
      ],
      valTypeOptions: [
        {
          value: 'String',
          label: 'String'
        },
        {
          value: 'Int',
          label: 'Int'
        },
        {
          value: 'Double',
          label: 'Double'
        },
        {
          value: 'Boolean',
          label: 'Boolean'
        },
        {
          value: 'Date',
          label: 'Date'
        }
      ]
    }
  },
  created() {},
  methods: {
    open() {
      this.propTableData.col = this.oneRow
      this.propTableData.col.map(i => {
        i.isSet = false
      })
      console.log('open', this.propTableData.col)
    },
    // 添加
    handleAdd() {
      for (let i of this.propTableData.col) {
        if (i.isSet) {
          return this.Message(
            this.$t('basicData.device.propDlg.pleSave'),
            'warning'
          )
        }
      }
      let row = {
        code: '',
        maxValue: '',
        minValue: '',
        name: '',
        valueType: 'String',
        id: '',
        typeId: '',
        warning: false,
        isSet: true
      }
      this.propTableData.col.push(row)
      this.propTableData.sel = row
    },
    //修改
    valChange(row, index, qx) {
      console.log('edit', this.propTableData)
      //点击修改，判断是否已经保存所有操作
      for (let i of this.propTableData.col) {
        console.log('i.isSet', i.isSet, i.id, row.id)
        if (i.isSet && i.id != row.id) {
          this.Message(this.$t('basicData.device.propDlg.pleSave'), 'warning')
          return false
        }
      }
      //是否是取消操作
      if (!qx) {
        console.log('qx', this.propTableData.sel.id)
        if (!this.propTableData.sel.id) {
          this.propTableData.col.splice(index, 1)
        }
        return (row.isSet = !row.isSet)
      }
      //提交数据
      if (row.isSet) {
        console.log('this.propTableData.sel', this.propTableData.sel)
        const v = this.propTableData.sel
        // 必填项判断
        if (v.code == '' || v.name == '') {    
          this.Message(this.$t('common.pleEnter'), 'warning')
        } else {
          this.$emit('confirm', this.propTableData.sel)
          row.isSet = false
        }
      } else {
        this.propTableData.sel = row
        row.isSet = true
      }
    },
    // 删除
    handleDelete(index, row) {
      this.$emit('delete', row.id)
    },
    beforeClose() {
      this.$emit('cancel')
    },
    Message(msg, type) {
      this.$message({ type: type ? type : 'info', message: msg })
    }
  }
}
</script>

<style lang="scss">
</style>