<template>
  <a-table :columns="columns" :data-source="data" bordered>
    <template v-for="col in ['name', 'age', 'address']" :slot="col" slot-scope="text, record">
      <div :key="col">
        <a-input
          v-if="record.editable"
          style="margin: -5px 0"
          :value="text"
          @change="e => handleChange(e.target.value, record.key, col)"
        />
        <template v-else>{{ text }}</template>
      </div>
    </template>
    <template slot="operation" slot-scope="text, record">
      <div class="editable-row-operations">
        <span v-if="record.editable">
          <a @click="() => save(record.key)">Save</a>
          <a-popconfirm title="Sure to cancel?" @confirm="() => cancel(record.key)">
            <a>Cancel</a>
          </a-popconfirm>
        </span>
        <span v-else>
          <a :disabled="editingKey !== ''" @click="() => edit(record.key)">Edit</a>
        </span>
      </div>
    </template>
  </a-table>
</template>
<script>
const columns = [
  {
    title: "name",
    dataIndex: "name",
    width: "25%",
    scopedSlots: { customRender: "name" }
  },
  {
    title: "age",
    dataIndex: "age",
    width: "15%",
    scopedSlots: { customRender: "age" }
  },
  {
    title: "address",
    dataIndex: "address",
    width: "40%",
    scopedSlots: { customRender: "address" }
  },
  {
    title: "operation",
    dataIndex: "operation",
    scopedSlots: { customRender: "operation" }
  }
];

const data = [];
for (let i = 0; i < 100; i++) {
  data.push({
    key: i.toString(),
    name: `Edrward ${i}`,
    age: 32,
    address: `London Park no. ${i}`
  });
}

export default {
  data() {
    this.cacheData = data.map(item => ({ ...item }));
    return {
      data,
      columns,
      editingKey: ""
    };
  },
  mounted() {
    this.createData();
  },
  methods: {
    createData() {
      let that = this;
      let num = 5;
      while (num--) {
        that.data = that.data.concat(
          that.data.map(ele => {
            return {
              ...ele,
              key: ele.key + Math.random(),
              address: ele.address + Math.random()
            };
          })
        );
      }
    },
    handleChange(value, key, column) {
      const newData = [...this.data];
      const target = newData.filter(item => key === item.key)[0];
      if (target) {
        target[column] = value;
        this.data = newData;
      }
    },
    edit(key) {
      const newData = [...this.data];
      const target = newData.filter(item => key === item.key)[0];
      this.editingKey = key;
      if (target) {
        target.editable = true;
        this.data = newData;
      }
    },
    save(key) {
      const newData = [...this.data];
      const newCacheData = [...this.cacheData];
      const target = newData.filter(item => key === item.key)[0];
      const targetCache = newCacheData.filter(item => key === item.key)[0];
      if (target && targetCache) {
        delete target.editable;
        this.data = newData;
        Object.assign(targetCache, target);
        this.cacheData = newCacheData;
      }
      this.editingKey = '';
    },
    cancel(key) {
      const newData = [...this.data];
      const target = newData.filter(item => key === item.key)[0];
      this.editingKey = '';
      if (target) {
        Object.assign(target, this.cacheData.filter(item => key === item.key)[0]);
        delete target.editable;
        this.data = newData;
      }
    },
  }
};
</script>
<style lang="less" scoped>
.table {
  height: 100%;
}
</style>