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データをAngular 2？

TypeScriptでデータをAngular 2にグループ化するにはどうすればよいですか。これは、Angular 1.Xデータをグループ化する方法を取得するAngular 2.この配列があります。

import {Employee} from './employee';
        export var employees: Employee[];
        employees = [
            { id: 1, firstName: "John", lastName: "Sonmez", department: 1, age: 24, address: "24/7, Working hours apartment, Cal. US", contactNumber: "+968546215789" },
            { id: 2, firstName: "Mark", lastName: "Seaman", department: 2, age: 25, address: "32-C, Happy apartments, Block-9C, Cal. US", contactNumber: "+968754216984" },
            { id: 3, firstName: "Jamie", lastName: "King", department: 3, age: 32, address: "54/II, Glorydale apartment, Cal. US", contactNumber: "+967421896326" },

            { id: 5, firstName: "Jacob", lastName: "Ridley", department: 5, age: 24, address: "24/7, Working hours apartment, Cal. US", contactNumber: "+968546215789" },
            { id: 6, firstName: "Peter", lastName: "Parker", department: 3, age: 25, address: "32-C, Happy apartments, Block-9C, Cal. US", contactNumber: "+968754216984" },
            { id: 7, firstName: "Martin", lastName: "Luther", department: 4, age: 32, address: "54/II, Glorydale apartment, Cal. US", contactNumber: "+967421896326" },
            { id: 8, firstName: "Raghav", lastName: "Kumar", department: 1, age: 34, address: "51/C Shivalik, Cal. US", contactNumber: "+967842569842" },

            { id: 9, firstName: "Narayan", lastName: "Sonmez", department: 3, age: 24, address: "24/7, Working hours apartment, Cal. US", contactNumber: "+968546215789" },
            { id: 10, firstName: "Russell", lastName: "Andre", department: 2, age: 25, address: "32-C, Happy apartments, Block-9C, Cal. US", contactNumber: "+968754216984" },
            { id: 11, firstName: "Ramona", lastName: "King", department: 4, age: 32, address: "54/II, Glorydale apartment, Cal. US", contactNumber: "+967421896326" },
            { id: 12, firstName: "Andre", lastName: "Russell", department: 1, age: 34, address: "51/C Shivalik, Cal. US", contactNumber: "+967842569842" },

            { id: 13, firstName: "Nathan", lastName: "Leon", department: 1, age: 24, address: "24/7, Working hours apartment, Cal. US", contactNumber: "+968546215789" },
            { id: 14, firstName: "Brett", lastName: "Lee", department: 5, age: 25, address: "32-C, Happy apartments, Block-9C, Cal. US", contactNumber: "+968754216984" },
            { id: 15, firstName: "Tim", lastName: "Cook", department: 2, age: 32, address: "54/II, Glorydale apartment, Cal. US", contactNumber: "+967421896326" },
            { id: 16, firstName: "Steve", lastName: "Jobs", department: 5, age: 34, address: "51/C Shivalik, Cal. US", contactNumber: "+967842569842" }
        ];

部門ごとに従業員を数えたい

部門1には4人の従業員がいます

等々。

部門IDを実際の部門に参加させる（部門名を取得できるようにする）ことも、理解する必要がある別の話です。

angulartypescript1.7
23
shrekDeep

以下で説明するように、 カスタムパイプ を使用できます。

@Pipe({name: 'groupBy'})
export class GroupByPipe implements PipeTransform {
  transform(value: Array<any>, field: string): Array<any> {
    const groupedObj = value.reduce((prev, cur)=> {
      if(!prev[cur[field]]) {
        prev[cur[field]] = [cur];
      } else {
        prev[cur[field]].Push(cur);
      }
      return prev;
    }, {});
    return Object.keys(groupedObj).map(key => ({ key, value: groupedObj[key] }));
  }
}

次に、テンプレートに次のように記述できます。

<div *ngFor="let item of employees | groupBy:'department'">
  Department {{ item.key }} has {{ item.value.length }} employees
</div>

対応するプランカーも参照してください https://plnkr.co/edit/cLnlH13IH4WAsuRdol4n?p=preview

それがあなたを助けることを願っています！

52
yurzui
var dept = employees.map((m) => m.department).filter((f, i, ar) => ar.indexOf(f) === i);
console.log(dept);

var group = employees.reduce((accumulator, item, i, arr) => {
  if (dept.length) {
    var pop = dept.shift();
    var list = arr.filter((f) => f.department == pop);
    accumulator.Push(...list);
  }
  return accumulator;
}, []);

console.log(group);
0
Farhaan

Ngx-pipesを使用できます https://github.com/danrevah/ngx-pipes#groupby

this.arrayObject = [
  {id: 1, Elm: 'foo', value: 0}, 
  {id: 2, Elm: 'bar', value: 1}, 
  {id: 3, Elm: 'foo', value: 2}, 
  {id: 4, Elm: 'foo', value: 2}
];

this.arrayNestedObject = [
  {id: 1, prop: { deep: 'foo' }},
  {id: 2, prop: { deep: 'bar' }},
  {id: 3, prop: { deep: 'foo' }},
  {id: 4, prop: { deep: 'bar' }}
];
<p>{{ arrayObject | groupBy: 'Elm' }}</p> 
<!-- Output: "{foo: [{id: 1, Elm: 'foo', value: 0}, {id: 3, Elm: 'foo', value: 2}, {id: 4, Elm: 'foo', value: 2}], bar: [{id: 2, Elm: 'bar', value: 1}]}" -->
0
user3573136