<template>
  <div>
    <el-tree
      :data="data"
      lazy
      node-key="id"
      :load="loadNode"
      :props="props"
      :expand-on-click-node="false"
    >
      <span slot-scope="{ node, data }">
        <span>{{ data.name }}</span>
        <span>
          <el-button type="text" size="mini" @click="append(node,data)">新增</el-button>
          <el-button type="text" size="mini" @click="replace(node, data)">修改</el-button>
          <el-button type="text" size="mini" @click="remove(node, data)">删除</el-button>
        </span>
      </span>
    </el-tree>
    <el-dialog :title="dialog.title" :visible="dialog.visible" @close="handleCancel">
      <el-form :model="dialog" label-width="120px" ref="form">
        <el-form-item label="名字" :label-col="{ span: 4 }" :wrapper-col="{ span: 20 }" prop="name">
          <el-input v-model="dialog.name" />
        </el-form-item>
      </el-form>
      <template slot="footer">
        <el-button @click="handleCancel">取消</el-button>
        <el-button type="primary" @click="dataFormSubmitHandle">保存</el-button>
      </template>
    </el-dialog>
  </div>
</template>

<script>
import {
  getTreeDemoData,
  deleteTreeDemoData,
  putTreeDemoData,
  postTreeDemoData
} from "@/api/treeDemo";
export default {
  name: "tree_demo",
  data() {
    return {
      props: {
        isLeaf: (data, node) => this.isChi(data, node)
      },
      data: [],
      dialog: {
        title: "",
        visible: false,
        name: "",
        id: -1,
        parentId: -1
      }
    };
  },
  methods: {
    // 处理后端传来的参数  是否有孩子节点和前端的是否为叶子节点判断相反
    isChi: function(data, node) {
      return !data.childer;
    },
    // 新增按钮
    append: function(node, data) {
      this.dialog.title = "新增";
      this.dialog.visible = true;
      this.id = -1;
      this.dialog.parentId = data.parent_id;
    },
    // 修改按钮
    replace: function(node, data) {
      this.dialog.title = "编辑";
      this.dialog.name = data.name;
      this.dialog.id = data.id;
      this.dialog.visible = true;
      console.log(data);
    },
    // 删除按钮
    remove: function(node, data) {
      deleteTreeDemoData({
        id: data.id
      }).then(res => {
        this.$message({
          message: "删除成功",
          type: "warning"
        });
      });
    },
    // 加载子树数据的方法
    loadNode: function(node, resolve) {
      getTreeDemoData({
        parent: node.data.id
      }).then(res => {
        return resolve(res.data);
      });
    },
    // 弹窗的取消按钮
    handleCancel: function() {
      this.dialog.name = "";
      this.dialog.visible = false;
    },
    // 弹窗的确定按钮
    dataFormSubmitHandle: function() {
      if (this.dialog.id == -1) {
        postTreeDemoData({
          id: this.dialog.parentId,
          name: this.dialog.name
        }).then(res => {
          this.$message({
            message: "新增成功",
            type: "success"
          });
        });
        this.dialog.name = "";
        this.dialog.visible = false;
      } else {
        putTreeDemoData({
          id: this.dialog.id,
          name: this.dialog.name
        }).then(res => {
          this.$message({
            message: "更新成功",
            type: "success"
          });
        });
        this.dialog.name = "";
        this.dialog.visible = false;
      }
    }
  }
};
</script>
