单选按钮组之间的制表符以角度形式中断

Question

我有两个单选按钮组，添加了角度形式控件。我遇到的问题是，当我添加控件时，单选按钮分组正在消失。此外，当我检查单选按钮时，它的name属性也正在消失。其效果是，我无法再在不同的单选按钮组之间正确切换。我该怎么解决这个问题？

示例：https://stackblitz.com/edit/angular-qdqnmo

TS:

import { Component, OnInit } from '@angular/core';
import { FormControl, FormGroup } from '@angular/forms';
@Component({
selector: 'my-app',
templateUrl: './app.component.html',
styleUrls: [ './app.component.css' ]
})
export class AppComponent implements OnInit {
formData = {
"questions": [
{
"refCode": "Question1",
"answers": [
{
"refCode": "Question1Answer1",
"selected": true
},
{
"refCode": "Question1Answer2",
"selected": false
}
]
},
{
"refCode": "Question2",
"answers": [
{
"refCode": "Question2Answer1",
"selected": false
},
{
"refCode": "Question2Answer2",
"selected": false
},
{
"refCode": "Question3Answer3",
"selected": true
}
]
}
]
};
formGroup: FormGroup;
ngOnInit() {
const group = {};
this.formData.questions.forEach(question => {
group[question.refCode] = new FormControl();
});
this.formGroup = new FormGroup(group);
}
}

HTML:

<h2>Normal Buttons:</h2>
<div *ngFor="let question of formData.questions; index as i;">
<h3>Group {{i + 1}}:</h3>
<div>
<div *ngFor="let answer of question.answers" >
<input type="radio" id="answer.refCode" [checked]="answer.selected" 
[name]="question.refCode" [value]="answer.refCode" >
<label for="answer.refCode">{{answer.refCode}}</label>  
</div>
</div>
--------------------------------------------------------------------
</div>
<h2>Angular Buttons:</h2>
<div *ngFor="let question of formData.questions; index as i;">
<h3>Group {{i + 1}}:</h3>
<div [formGroup]="formGroup">
<div *ngFor="let answer of question.answers" >
<input type="radio" id="answer.refCode" [checked]="answer.selected" 
[name]="question.refCode" [value]="answer.refCode" 
[formControlName]="question.refCode">
<label for="answer.refCode">{{answer.refCode}}</label>  
</div>
</div>
--------------------------------------------------------------------
</div>

模块：

import { NgModule } from '@angular/core';
import { BrowserModule } from '@angular/platform-browser';
import { FormsModule, ReactiveFormsModule } from '@angular/forms';
import { AppComponent } from './app.component';
@NgModule({
imports:      [ BrowserModule, FormsModule, ReactiveFormsModule ],
declarations: [ AppComponent ],
bootstrap:    [ AppComponent ]
})
export class AppModule { }

Answer 1

离题：有趣的问题，以前没注意到

使用属性绑定而不是属性绑定似乎可以解决这个问题！这样，您就可以在字段中获得实际的name属性，就像"普通"按钮一样。

但是。。。你还有另一个即将到来的问题，所以让我们也来解决这个问题，不管怎样，你最终都会遇到这个问题。

但首先，使用属性绑定：

用途：

[attr.name]="question.refCode"

而不是：

[name]="question.refCode"

然后再谈你的另一个问题。当然，当在模板中使用[checked]时，它看起来是选中的，但实际上表单值是在与单选按钮交互之前才设置的。因此，删除[checked]，改为将值设置为表单控件。这意味着您正在寻找selected属性为true(如果存在(的答案，但您希望使用refCode作为值。然后我建议如下：

this.formData.questions.forEach(question => {
const preselected = question.answers.find(x => x.selected === true)
group[question.refCode] = new FormControl((preselected && preselected.refCode) || null);
});

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