angular前端对后台返回的Json数据的封装通用方法

深藏阁楼爱情的钟 2022-04-17 20:16 266阅读 0赞

后台返回的数据格式有如下几种

第一种一般是`code:name`形式返回，例如

response:{
      "langs": {
          "en_gb": "English (UK)",
          "zh_hk": "Traditional Chinese (Hong Kong)",
          "zh_cn": "Simplified Chinese (China)"
        }
    }

前端的数据需要构造出以下

data:{
        languages:[{
            code:"en_gb",
            name:"English (UK)"
        },{
            code:"zh_hk",
            name:"Traditional Chinese (Hong Kong)"
        },{
            code:"zh_cn",
            name:"Simplified Chinese (China)"
        }]
    }

第二种是个对象的数组返回，例如

response:{
        "countryList": [{
          "key": "1",
          "code": "AFG",
          "name": "AFGHANISTAN",
          "countryPhone": "93"
        }, {
          "key": "2",
          "code": "ALA",
          "name": "ALAND ISLANDS",
          "countryPhone": "358"
        }, {
          "key": "3",
          "code": "ALB",
          "name": "ALBANIA",
          "countryPhone": "355"
        }]
    }

前端需要对返回的response映射成如下

data:{
        countryList:[{
            countryCode: "AFG",
            countryName: "AFGHANISTAN",
            countryPrePhoneNumber: "93"
        },{
            countryCode: "ALA",
            countryName: "ALAND ISLANDS",
            countryPrePhoneNumber: "358"
        },{
            countryCode: "ALB",
            countryName: "ALBANIA",
            countryPrePhoneNumber: "355"
        }]
    }

上述过程基本都是遍历一个json来构造出另个json,可以写出一个通用的方法来做  
以下是**typsejs**的写法

private popData<T extends Model>(respData: any , arr: Array<T>, t: T , 
    fieldMap: any = {'keyField': 'code', 'valueField': 'name'}) {
    if (!respData) return;
        if (respData instanceof Array) {
          respData.forEach(function (value) {
            let item = Object.create(t);
            for (let f in value) {
              if (value[f] && fieldMap[f]) {
                item[fieldMap[f]] = value[f];
              }
            }
            arr.push(item);
          });
        } else {
          for (let f in respData) {
            if (respData.hasOwnProperty(f)) {
              let item = Object.create(t);
              item[fieldMap['keyField']] = f;
              item[fieldMap['valueField']] = respData[f];
              arr.push(item);
            }
          }
        }
    }

Model

export class Model {
      code: string;
      name: string;
    }

Data

export class Data {
      countryList ?: Array<Country> = new Array<Country>() ;
      languages ?: Array<Language> = new Array<Language>() ;
    }

Country和Language

export class Country extends Model {
      countryCode: string;
      countryName: string;
      countryPrePhoneNumber: string;
    }
    
    export class Language extends Model {
    }

针对第一种

let initData = new Data();
    this.popData(response['langs'], initData.languages, new Language());

针对第二种

let initData = new Data();
    this.popData(response['countryList'], initData.countryList, new Country(),
            {'code': 'countryCode',
            'name': 'countryName',
            'countryPhone': 'countryPrePhoneNumber' });

针对第一种的另种情况，Language虽然继承Model，但是命名不想用code和name而是

export class Language extends Model {
      langCode : string;
      langName ：string;
    }

可以使用如下

let initData = new Data();
    this.popData(response['langs'], initData.languages, new Language(),
            {'keyField': 'langCode', 'valueField': 'langName'});