# 基于Vue和Quasar的前端SPA项目实战之动态表单（五）

# 回顾

通过上一篇文章基于Vue和Quasar的前端SPA项目实战之序列号（四）的介绍，我们已经完成了元数据中序列号的增删改查，本文主要介绍动态表单设计功能的实现。

# 简介

在crudapi系统中，所有的业务表单都是通过配置动态生成的，代码无需写死，有关基本概念参考之前文章元数据管理—动态表单设计器在crudapi系统中完整实现，表单配置好之后，对应的crud接口就自动生成了。

# UI界面

表单列表

创建表单

索引管理

# API

表单管理API 表单API包括基本的CRUD操作，具体的通过swagger文档可以查看。通过axios封装api，名称为metadataTable

import { axiosInstance } from "boot/axios";

const metadataTable = {
  create: function(data) {
    return axiosInstance.post("/api/metadata/tables",
       data
    );
  },
  update: function(id, data) {
    return axiosInstance.patch("/api/metadata/tables/" + id,
       data
    );
  },
  list: function(page, rowsPerPage, search, query) {
    if (!page) {
      page = 1
    }

    if (!rowsPerPage) {
      rowsPerPage = 10
    }

    return axiosInstance.get("/api/metadata/tables",
      {
        params: {
          offset: (page - 1) * rowsPerPage,
          limit: rowsPerPage,
          search: search,
          ...query
        }
        //permission: ["ROLE_META_TABLE_R"]
      }
    );
  },
  count: function(search, query) {
    return axiosInstance.get("/api/metadata/tables/count",
      {
        params: {
          search: search,
          ...query
        }
      }
    );
  },
  get: function(id) {
    return axiosInstance.get("/api/metadata/tables/" + id,
      {
        params: {
        }
      }
    );
  },
  getByName: function(name) {
    return axiosInstance.get("/api/metadata/tables/name/" + name,
      {
        params: {
        }
      }
    );
  },
  delete: function(id) {
    return axiosInstance.delete("/api/metadata/tables/" + id);
  },
  batchDelete: function(ids) {
    return axiosInstance.delete("/api/metadata/tables",
      {data: ids}
    );
  }
};

export { metadataTable };

# 核心代码

# q-table控件

表单设计页面用到了q-table控件，每一个字段对应一个行，

 <q-table
        :data="table.columns"
        :columns="columns"
        :visible-columns="visibleColumns"
        :pagination.sync="tablePagination"
        row-key="id"
        selection="multiple"
        :selected.sync="selected"
        :loading="loading"
        flat
        separator="cell"
        hide-bottom>
</q-table>

# columns定义

columns定义了q-table的列属性，涵盖表单的全部属性，比如名称，是否为一，数据类型，长度等。

columns: [
  {
    name: "dataClickAction",
    align: "center",
    label: "操作",
    field: "dataClickAction",
    sortable: false
  },
  {
    name: "displayOrder",
    align: "left",
    label: "顺序",
    field: "displayOrder",
    sortable: false
  }, {
    name: "caption",
    align: "left",
    label: "中文名称",
    field: "caption",
    sortable: false
  }, {
    name: "name",
    align: "left",
    label: "英文字段",
    field: "name",
    sortable: false
  }, {
    name: "description",
    align: "left",
    label: "描述",
    field: "description",
    sortable: false
  }, {
    name: "unsigned",
    align: "left",
    label: "无符号",
    field: "unsigned",
    sortable: false
  }, {
    name: "dataType",
    align: "left",
    label: "数据类型",
    field: "dataType",
    sortable: false
  }, {
    name: "indexType",
    align: "left",
    label: "索引类型",
    field: "indexType",
    sortable: false
  }, {
    name: "indexStorage",
    align: "left",
    label: "索引存储",
    field: "indexStorage",
    sortable: false
  }, {
    name: "indexName",
    align: "left",
    label: "索引名称",
    field: "indexName",
    sortable: false
  }, {
    name: "length",
    align: "left",
    label: "长度",
    field: "length",
    sortable: false
  }, {
    name: "precision",
    align: "left",
    label: "精度",
    field: "precision",
    sortable: false
  }, {
    name: "scale",
    align: "left",
    label: "小数",
    field: "scale",
    sortable: false
  }, {
    name: "autoIncrement",
    align: "left",
    label: "自增长",
    field: "autoIncrement",
    sortable: false
  }, {
    name: "nullable",
    align: "left",
    label: "空",
    field: "nullable",
    sortable: false
  }, {
    name: "defaultValue",
    align: "left",
    label: "默认值",
    field: "defaultValue",
    sortable: false
  },{
    name: "seqId",
    align: "left",
    label: "序列号",
    field: "seqId",
    sortable: false
  }, {
    name: "insertable",
    align: "left",
    label: "插入",
    field: "insertable",
    sortable: false
  }, {
    name: "updatable",
    align: "left",
    label: "编辑",
    field: "updatable",
    sortable: false
  }, {
    name: "queryable",
    align: "left",
    label: "查询",
    field: "queryable",
    sortable: false
  }
]

# 字段顺序调整

支持上移，下移，置顶，置底四种操作。

onTopClick: function(row) {
  const columns = this.table.columns;
  const index = columns.findIndex(t => t.id === row.id);
  if (index != 0){
    columns.unshift(columns.splice(index, 1)[0]);
    }
},
onUpClick: function(row) {
  const columns = this.table.columns;
  const index = columns.findIndex(t => t.id === row.id);
  if (index != 0){
    columns[index] = columns.splice(index - 1, 1, columns[index])[0];
    console.dir(columns);
    }
},
onDownClick: function(row) {
  const columns = this.table.columns;
  const index = columns.findIndex(t => t.id === row.id);
  if (index != columns.length - 1){
    columns[index] = columns.splice(index + 1, 1, columns[index])[0];
  }
},
onBottomClick: function(row) {
  const columns = this.table.columns;
  const index = columns.findIndex(t => t.id === row.id);
  if (index != columns.length - 1){
    columns.push(columns.splice(index, 1)[0]);
  }
}