如何从 Mat-radio-group 中获取选定的单选按钮值，并在 Angular 中使用 For 循环

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，以确保他们对 0-5 的答案进行评分，现在当我渲染我的 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，它也从所有其他评级中进行选择，而且我还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数组

在我的 .ts 文件中，我将我的模型引用作为数组给出，如下所示：

sectionRating: any[] = [];

Answer 1

你可以试试这个，使用(change)事件，然后在局部变量中添加点击项。

网页代码：

<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>

TS 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);
}
}
}

StackBlitz_Demo