Vue在MVC中的进行前后端的交互

Vue在ASP.NET MVC中的进行前后端的交互

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Preface：

由于最近在研究前端相关的技术，作为前端非常优秀的框架Vue，个人在学习的过程中遇到一些问题，网上相关资料有限，所以在这这里总结一下个人使用Vue的一点经验，以便后来者借鉴！

官方文档:Vue.js

使用Vue在ASP.NET MVC中进行前后端交互
在阅读下面的文章之前你需要先了解一下Vue官方推荐的前后端交互的插件：

1.resource（官方在2.0版本之后取消了对此插件的维护）

2.axios

注：这里使用的都是异步的插件，因为这样才会在你的项目中具有使用意义，当然你也可以用其它的js库，如jQuery、Fetch等等...

Instance:

Controller

 using Demo.Models;
 using System;
 using System.Collections.Generic;
 using System.Linq;
 using System.Web;
 using System.Web.Mvc;

 namespace Demo.Controllers
 {
     //[RoutePrefix("api/Goods")]
     public class GoodsController : Controller
     {
         List<GoodsEntity> goosdList = new List<GoodsEntity>
         {
             new GoodsEntity(){ ID=,Name="水",Type=,Price=},
             new GoodsEntity(){ ID=,Name="牛奶",Type=,Price=},
             new GoodsEntity(){ ID=,Name="面包",Type=,Price=}
         };

         // GET: Goods
         public ActionResult Index()
         {
             return View();
         }

         public ActionResult Check()
         {
             return View();
         }

         [HttpGet]
         public JsonResult GetGoodsType()
         {
             List<int> goodsType = new List<int>();
             foreach (var item in goosdList)
             {
                 if (!goodsType.Contains(item.Type))
                 {
                     goodsType.Add(item.Type);
                 }
             }
             return Json(goodsType, JsonRequestBehavior.AllowGet);
         }

         [HttpGet]
         public JsonResult GetAllGoods()
         {
             return Json(goosdList, JsonRequestBehavior.AllowGet);
         }

         [HttpPost]
         public JsonResult GetGoods(int id)
         {
             var entity = goosdList.Where(g => g.ID == id).FirstOrDefault();
             if (entity != null)
             {
                 return Json(new ReturnJsonInfo(, "success!", entity));
             }
             return Json(new ReturnJsonInfo(, "error!", null));
         }

         [HttpPost]
         public JsonResult UpdateGoods(GoodsEntity entity)
         {
             if (entity!=null)
             {
                 var goodsEntiy = goosdList.FirstOrDefault(g => g.ID == entity.ID);
                 if (goodsEntiy!=null)
                 {
                     goodsEntiy = entity;
                     return Json(new ReturnJsonInfo(, "success!", goosdList));
                 }
                 goosdList.Add(entity);
                 return Json(new ReturnJsonInfo(, "success!", goosdList));
             }
             return Json(new ReturnJsonInfo(, "error!",null));
         }

         [HttpPost]
         public JsonResult DelectGoods(int id)
         {
             var entity = goosdList.Where(g => g.ID == id).FirstOrDefault();
             if (entity != null)
             {
                 goosdList.Remove(entity);
                 return Json(new ReturnJsonInfo(, "success!", goosdList));
             }
             return Json(new ReturnJsonInfo(, "error!",null));
         }

     }
 }

在上面的控制器中加载了一些示例数据，并且都是以json的格式返回前端，这样前端就可以直接使用这些数据。

注：控制器返回至前端的json中，上面使用 “ReturnJsonInfo” 对象序列化进行返回， “ReturnJsonInfo” 代码如下。

 using System;
 using System.Collections.Generic;
 using System.Linq;
 using System.Web;

 namespace Demo.Models
 {
     public class ReturnJsonInfo
     {
         public int Code { get; set; }
         public string Message { get; set; }
         public object Entity { get; set; }
         public ReturnJsonInfo(int code, string message,object obj)
         {
             this.Code = code;
             this.Message = message;
             this.Entity = obj;
         }
     }
 }

View

1.前端采用resource插件

 @{
     ViewBag.Title = "Goods IndexPage";
 }
                  <script type="text/javascript" src="~/Resources/Scripts/vue.js"></script>
                  <script type="text/javascript" src="~/Resources/Scripts/vue-resource.js"></script>
 <h2>Index</h2>
                <div id="demo">
                       <table>
                           <tr>
                               <td><label>编号：</label></td>
                               <td><input type="text" v-model="newGoods.id" /></td>

                               <td><label>名称：</label></td>
                               <td><input type="text" v-model="newGoods.name" /></td>

                               <td><label>类型：</label></td>
                               <td><input type="text" v-model="newGoods.type" /></td>

                               <td><label>售价：</label></td>
                               <td><input type="text" v-model="newGoods.price" /></td>

                               <td><input type="submit" value="查询" v-on:click="GetGoods(newGoods.id)" /></td>
                           </tr>
                       </table>
                               <table v-show="goodsList.length">
                                   <tr>
                                       <td>编号</td>
                                       <td>名称</td>
                                       <td>类型</td>
                                       <td>售价</td>
                                   </tr>
                                   <tr v-for="item in goodsList">
                                       <td>{{item.ID}}</td>
                                       <td>{{item.Name}}</td>
                                       <td>{{item.Type}}</td>
                                       <td>{{item.Price}}</td>
                                   </tr>
                               </table>
                </div>
 <script type="text/javascript">
     var view = new Vue(
         {
             el: "#demo",
             data: {
                 goodsList: [],
                 newGoods: {id:'',name:'',type:'',price:''}
             },
             created: function () {
                 this.InIt();
             },
             methods: {
                 InIt: function () {
                     //初始化
                     this.GetAllGoods();
                 },
                 GetAllGoods: function () {
                     var _self = this;
                     _self.$http.get("../Goods/GetAllGoods").then(
                         // Lambda写法
                         (response) => {
                             //successCallback
                             for (var i = 0; i < response.data.length; i++) {
                                 _self.goodsList.push(response.data[i]);
                             }
                         } ,
                         (response) => {
                                    //errorCallback
                         }
                     );
                 },
                 GetGoods: function (_id) {
                     var _self = this;
                     _self.goodsList = [];
                     if (_id.length > 0) {
                         _self.$http.post("../Goods/GetGoods", { id: _id }).then(
                             // 传统写法
                             function (response) {
                                 //successCallback
                                 if (response.data.Code == 500) {
                                     _self.goodsList.push(response.data.Entity);
                                 }
                                 else {
                                     alert(response.data.Message);
                                 }
                             },
                             function (response) {
                                 //errorCallback
                             }
                         )
                             .catch(function (response) {
                                 console.log(response);
                             });
                     }
                     else {
                         _self.GetAllGoods();
                     }
             }
             }
         }
     );
 </script>

2.前端采用axios插件

 @{
     Layout = null;
 }

 <!DOCTYPE html>

 <html>
 <head>
     <meta name="viewport" content="width=device-width" />
     <title>Check</title>
     <script type="text/javascript" src="~/Resources/Scripts/vue.js"></script>
     <script type="text/javascript" src="~/Resources/Scripts/axios.min.js"></script>
 </head>
 <body>
     <div id="demo">
         <div>
             <table>
                 <tr>
                     <td><label>编号：</label></td>
                     <td><input type="text" v-model="newGoods.id" /></td>

                     <td><label>名称：</label></td>
                     <td><input type="text" v-model="newGoods.name" /></td>

                     <td><label>类型：</label></td>
                     <td>
                         <select v-model="newGoods.type">
                             <option value="">---ALL---</option>
                             <option v-for="type in goodsType" v-bind:value="type">{{type}}</option>
                         </select>
                     </td>

                     <td><label>售价：</label></td>
                     <td><input type="text" v-model="newGoods.price" /></td>

                     <td>
                         <input type="submit" value="查询" v-on:click="GetGoods(newGoods.id)" />
                         <input type="submit" value="更新" v-on:click="UpdateGoods(newGoods.id,newGoods.name,newGoods.type,newGoods.price)" />
                         <input type="submit" value="删除" v-on:click="DelectGoods(newGoods.id)" />
                     </td>
                 </tr>
             </table>
         </div>
         <div>
             <table v-show="goodsList.length">
                 <tr>
                     <td>行号</td>
                     <td>编号</td>
                     <td>名称</td>
                     <td>类型</td>
                     <td>售价</td>
                 </tr>
                 <tr v-for="(item,index) in goodsList">
                     <td>{{index+1}}</td>
                     <td>{{item.ID}}</td>
                     <td>{{item.Name}}</td>
                     <td>{{item.Type}}</td>
                     <td>{{item.Price}}</td>
                 </tr>
             </table>
         </div>
     </div>

     <script type="text/javascript">
         var vm = new Vue({
             el: "#demo",
             data: {
                 goodsType:[],
                 goodsList: [],
                 newGoods: { id: '', name: '', type: '', price: '' }
             },
             mounted() {
                 this.GetGoodsType();
                 this.GetAllGoods();
             },
             methods:
             {
                 GetGoodsType: function () {
                     axios.get("../Goods/GetGoodsType").then(
                         (response) => {
                             this.goodsType = [];
                             for (var i = 0; i < response.data.length; i++) {
                                 this.goodsType.push(response.data[i]);
                             }
                         },
                         (response) => {
                             alert(response.status);
                         }
                     )
                         .catch(function (response) {
                             console.log(response);
                         });
                 } ,
                 GetAllGoods: function () {
                     axios.get('../Goods/GetAllGoods').then(
                         function (response) {
                             vm.goodsList = [];
                             for (var i = 0; i < response.data.length; i++) {
                                 vm.goodsList.push(response.data[i]);
                             }
                             //vm.goodsList.splice(response.data.length);
                         },
                         function (response) {
                             alert(response.status);
                         }
                     )
                         .catch(
                         function (error) {
                             alert(error);
                         }
                         )
                 },
                 GetGoods: function (_id) {
                     if (_id.length > 0) {
                         axios.post("../Goods/GetGoods", { id: _id }).then(
                             (response) => {
                                 this.goodsList = [];
                                 if (response.data.Code == 500) {
                                     this.goodsList.push(response.data.Entity);
                                 }
                                 else {
                                     alert(response.data.Message);
                                 }

                             },
                             (response) => {
                                 alert(response.status);
                             }
                         )
                             .catch(function (response) {
                                 console.log(response);
                             });
                     }
                     else {
                         this.GetAllGoods();
                     }
                 },
                 UpdateGoods: function (_id,_name,_type,_price) {
                     axios.post("../Goods/UpdateGoods", { entity: { ID: _id, Name: _name, Type: _type, Price: _price } }).then(
                         (response) => {
                             this.goodsList = [];
                             if (response.data.Code == 500) {
                                 for (var i = 0; i < response.data.Entity.length; i++) {
                                     this.goodsList.push(response.data.Entity[i]);
                                 }
                             }
                             else {
                                 alert(response.data.Message);
                             }
                         },
                         (response) => {
                             alert(response.status);
                         }
                     )
                         .catch(function (response) {
                             console.log(response);
                         });
                 },
                 DelectGoods: function (_id) {
                     axios.post("../Goods/DelectGoods", { id: _id }).then(
                         (response) => {
                             this.goodsList = [];
                             if (response.data.Code == 500) {
                                 for (var i = 0; i < response.data.Entity.length; i++) {
                                     this.goodsList.push(response.data.Entity[i]);
                                 }
                             }
                             else {
                                 alert(response.data.Message);
                             }

                         },
                         (response) => {
                             alert(response.status);
                         }
                     )
                         .catch(function (response) {
                             console.log(response);
                         });
                 }
             },

         });
     </script>
 </body>
 </html>

在上面的视图中，前端都是用数组进行填充的，值得注意的是vue在数组监听这一块做得并不是特别友好。但也提供了一些非常友好的api。

如果你也采用上述方式更新view，请参阅vue官方提供的关于操作数组方法

Perorations:

在上面的Demo中，采用的是ASP.NET MVC模板。在写View部分的时候感觉确实比较方便，不需要再去写获取元素的代码，只需要把数据绑定至元素上，关注数据的变动就可以了。

当然你也可以选择Razor语法，只不过那样看起来并不是很友善。

以上是个人在写这个Demo之后的一些总结。如有描述不当，请@作者修改，谢谢！