angular - 如何使用 Angular 中的 For 循环从 Mat-radio-group 中获取选定的单选按钮值

Question

我有一个复杂的对象，即，如下所示

someName = [
{name: "John",id: "1",rating: ['0', '1', '2', '3', '4', '5']},
{name: "robert", id: "2", rating: ['0', '1', '2', '3', '4', '5']},
{name: "luv", id: "3", rating: ['0', '1', '2', '3', '4', '5']}
];

我想从中制作一份问卷，以确保他们从 0 到 5 给他们的答案打分，现在当我呈现我的 html 时，如下所示

<ng-container *ngFor="let sort of someName; let i=index">
   <label id="example-radio-group-label">Rate your favorite section</label>
   <mat-radio-group aria-labelledby="example-radio-group-label" class="example-radio-group" [(ngModel)]="sectionRating">
      <mat-radio-button class="example-radio-button" *ngFor="let section of sort.sections" [value]="section">{{season}}</mat-radio-button>
   </mat-radio-group>
</ng-container>

这是正确呈现的，但是当我选择我的第一个问题评级为 1 时，它也会从所有其他评级中进行选择，而且我想捕获这些我尝试过的每个评级 [(ngModel)]但它只给出一个值而不是一个数组

在我的 .ts 文件中，我将模型引用作为 Array 提供，如下所示:

sectionRating: any[] = [];

Answer 1

你可以试试这个，用 (change)事件，然后在局部变量中添加点击项。

HTML代码:

<ng-container *ngFor="let sort of someName; let i=index">
    <label id="example-radio-group-label">Rate your favorite section</label>
    <br>
    {{sort.name}}
    <br>
    <mat-radio-group aria-labelledby="example-radio-group-label" class="example-radio-group">
        <mat-radio-button class="example-radio-button" *ngFor="let section of sort.rating" [value]="section"
            (change)="radioChange($event,sort)">
            {{section}}</mat-radio-button>
    </mat-radio-group>
    <br>
    <br>

</ng-container>

<h2>Selected Array</h2>
<div>
   {{finalArray | json }}
</div>

代码:

import { Component } from '@angular/core';
import { MatRadioChange } from '@angular/material';
// ...

/**
 * @title Basic radios
 */
@Component({
  selector: 'radio-overview-example',
  templateUrl: 'radio-overview-example.html',
  styleUrls: ['radio-overview-example.css'],
})
export class RadioOverviewExample {
  someName = [
    { name: "John", id: "1", rating: ['0', '1', '2', '3', '4', '5'] },
    { name: "robert", id: "2", rating: ['0', '1', '2', '3', '4', '5'] },
    { name: "luv", id: "3", rating: ['0', '1', '2', '3', '4', '5'] }
  ];

  finalArray: any[] = [];

  radioChange(event: MatRadioChange, data) {
    var obj = this.someName.filter(x => x.id == data.id)[0];
    obj.selected = event.value;
    if (!this.finalArray.some(x => x.id == data.id)) {
      this.finalArray.push(obj);
    }
  }
}

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