angularjs循环对象属性实现动态列的思路详解

angularjs循环对象属性实现动态列

优点：保存对象，在数据库只保存一条数据

缺点：添加对象属性需要修改表结构、代码，然后重新重新发布

实现思路

1）数据库创建表（对象）、创建字段（对象属性）

2）根据表（对象）、字段（对象属性）生成配置表

3）根据表（对象）、字段（对象属性）生成三层架构

4）demo代码如下

1.接口代码：

using microsoft.aspnetcore.mvc;
using microsoft.extensions.logging;
using newtonsoft.json;
using system;
using system.collections.generic;
using system.diagnostics;
using system.linq;
using system.threading.tasks;
using webapplication1.models;
 
namespace webapplication1.controllers
{
    public class homecontroller : controller
    {
        public iactionresult index(string objecttype)
        {
            viewbag.objecttype = objecttype;
            return view();
        }
        [httppost]
        public jsonresult getitem(string objecttype)
        {
            if (objecttype == "student")
            {
                student item = new student
                {
                    no = "s001",
                    name = "张三",
                    gender = "男",
                };
                list<column> columns = new list<column>();
                columns.add(new column { columnname = "no", displaynname="学号" });
                columns.add(new column { columnname = "name", displaynname = "姓名" });
                columns.add(new column { columnname = "gender", displaynname = "性别" });
                return json(new { code = "1", msg = "", item = item, columns = columns });
            }
            else
            {
                school item = new school
                {
                    no = "s001",
                    name = "浙江大学",
                    address = "浙江",
                };
                list<column> columns = new list<column>();
                columns.add(new column { columnname = "no", displaynname = "编码" });
                columns.add(new column { columnname = "name", displaynname = "名称" });
                columns.add(new column { columnname = "address", displaynname = "地址" });
                return json(new { code = "1", msg = "", item = item, columns = columns });
            }
        }
 
        [httppost]
        public jsonresult saveitem(string objecttype, string itemstring)
        {
            if (objecttype == "student")
            {
                student item = jsonconvert.deserializeobject<student>(itemstring);
            }
            else
            {
                school item = jsonconvert.deserializeobject<school>(itemstring);
            }
            return json(new { resultcode = "1", resultmessage = "保存成功！" });
        }
    }
    public class student
    {
        public string no { get; set; }
        public string name { get; set; }
        public string gender { get; set; }
    }
    public class school
    {
        public string no { get; set; }
        public string name { get; set; }
        public string address { get; set; }
    }
    public class column
    { 
        public string columnname { get; set; }
        public string displaynname { get; set; }
    }
}

2.angularjs前端代码

@{
    viewdata["title"] = "home page";
}
 
<script type="text/javascript">
    var app = angular.module("my_app", []);
    app.controller('my_controller', function ($scope) {
        //保存
        $scope.saveitem = function () {
            var itemstring = json.stringify($scope.item)
            $.post('@url.action("saveitem", "home")', { objecttype: '@viewbag.objecttype', itemstring: itemstring }, function (data) {
 
            });
        }
        //获取
        $scope.getitem = function () {
            $.post('@url.action("getitem", "home")', { objecttype: '@viewbag.objecttype' }, function (result) {
                $scope.item = result.item;
                $scope.columns = result.columns;
                $scope.$apply();
            });
        }
        $scope.getitem();
    });
</script>
<div>
    <ul>
        <li ng-repeat="column in columns">
            <span>{{column.displaynname}}</span>
            <input ng-if="item[column.columnname]&&item[column.columnname].length" ng-model="item[column.columnname]" />
        </li>
    </ul>
    <input type="button" value="保存" ng-click="saveitem();" />
</div>

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