Angular：單選按鈕[選中]未使用模板參考變量設置

Question

正如標題所暗示的，我有一個場景，如果“全選”單選按鈕被選中，它必須選中下面列中的所有單選按鈕。 不幸的是，這不起作用。

這是一個示例：

<table>
  <thead>
    <th>Role</th>
    <th colspan="3">Access</th>
  </thead>
  <tbody>
    <tr>
      <td>Select All</td>
      <td>
        <input #none type="radio" name="access0" value="allNone"/>
        <label>None</label>
      </td>
      <td>
        <input #readOnly type="radio" name="access0" value="allReadOnly"/>
        <label>Read Only</label>
      </td>
      <td>
        <input #full type="radio" name="access0" value="AllFull"/>
        <label>Full</label>
      </td>
    </tr>
    <tr>
      <td>Admin</td>
      <td>
        <input type="radio" name="access1" value="None" [checked]="none.checked"/>
        <label>None</label>
      </td>
      <td>
        <input type="radio" name="access1" value="ReadOnly" [checked]="readOnly.checked"/>
        <label>Read Only</label>
      </td>
      <td>
        <input type="radio" name="access1" value="Access" [checked]="full.checked"/>
        <label>Full</label>
      </td>
    </tr>
    <tr>
      <td>Sales Person</td>
      <td>
        <input type="radio" name="access2" value="None" [checked]="none.checked"/>
        <label>None</label>
      </td>
      <td>
        <input type="radio" name="access2" value="ReadOnly" [checked]="readOnly.checked"/>
        <label>Read Only</label>
      </td>
      <td>
        <input type="radio" name="access2" value="Access" [checked]="full.checked"/>
        <label>Full</label>
      </td>
    </tr>
  </tbody>
</table>

這是指向示例 StackBlitz 的鏈接。

我不知道為什么，例如，設置[checked]時所有的“無”單選按鈕都沒有被[checked] ，如下所示：

<input type="radio" name="access1" value="None" [checked]="none.checked"/>

Answer 1

免責聲明，這不是答案，是對有關將 [(ngModel)] 用於 ReactiveForm 的評論的答案。

@monstertjie_za，該文檔表明您不要在同一個輸入中同時使用 formControlName 和 [(ngModel)]，並不是說您不能將輸入用於反應式表單。 想象一下你的例子。 你有一個像

form=new FormGroup({
    accessAdmin:new FormControl(),
    accessPersonal:new FormControl()
})

但是你想讓用戶快速選擇

<form [formGroup]="form">
    <!--a input that not belong to the ReactiveForm that use [(ngModel)]-->
    <div>
        <label><input type="radio" value="None" [ngModelOptions]="{standalone:true}"
           [ngModel]="access" (ngModelChange)="change($event)"/>None</label>
    <label><input type="radio" value="ReadOnly" [ngModelOptions]="{standalone:true}"
           [ngModel]="access" (ngModelChange)="change($event)"/>ReadOnly</label>
    <label><input type="radio" value="Access" [ngModelOptions]="{standalone:true}"
           [ngModel]="access" (ngModelChange)="change($event)"/>Access</label>
  </div>
        <!--inputs that belong to our formGroup-->
  <div>
    <label><input type="radio" value="None" formControlName="accessAdmin"/>None</label>
    <label><input type="radio" value="ReadOnly" formControlName="accessAdmin"/>ReadOnly</label>
    <label><input type="radio" value="Access" formControlName="accessAdmin"/>Access</label>
  </div>
  <div>
    <label><input type="radio" value="None" formControlName="accessPersonal"/>None</label>
    <label><input type="radio" value="ReadOnly" formControlName="accessPersonal"/>ReadOnly</label>
    <label><input type="radio" value="Access" formControlName="accessPersonal"/>Access</label>
  </div>
</form>
<pre>
  {{form?.value|json}}
</pre>

你有這樣的功能

change(value) {
    this.form.get('accessAdmin').setValue(value);
    this.form.get('accessPersonal').setValue(value);
  }

你可以看到stackblitz演示

您會看到我們使用帶有 [(ngModel)] 的輸入來幫助用戶更改 form.accessAdmin 和 form.accessPersonal 的值。 它與您向我展示的鏈接無關，並且格式完美-即使我會說幫助用戶也很好-

Answer 2

你必須使用ngModel來更新這樣的單選按鈕值 -

應用程序組件.html

<table>
  <thead>
    <th>Role</th>
    <th colspan="3">Access</th>
  </thead>
  <tbody>
    <tr>
      <td>Select All</td>
      <td>
        <input type="radio" name="access0" value="allNone" 
        [(ngModel)]='none'/>
        <label>None</label>
      </td>
      <td>
        <input [(ngModel)]='readonly' type="radio" name="access0" value="allReadOnly"/>
        <label>Read Only</label>
      </td>
      <td>
        <input [(ngModel)]='full' type="radio" name="access0" value="AllFull"/>
        <label>Full</label>
      </td>
    </tr>
    <tr>
      <td>Admin</td>
      <td>
        <input type="radio" name="access1" [value]="1" [checked]='none'/>
        <label>None</label>
      </td>
      <td>
        <input type="radio" name="access1" value="ReadOnly" [checked]='readonly'/>
        <label>Read Only</label>
      </td>
      <td>
        <input type="radio" name="access1" value="Access" [checked]="full"/>
        <label>Full</label>
      </td>
    </tr>
    <tr>
      <td>Sales Person</td>
      <td>
        <input type="radio" name="access2" value="None" [checked]="none"/>
        <label>None</label>
      </td>
      <td>
        <input type="radio" name="access2" value="ReadOnly" [checked]="readonly"/>
        <label>Read Only</label>
      </td>
      <td>
        <input type="radio" name="access2" value="Access" [checked]="full"/>
        <label>Full</label>
      </td>
    </tr>
  </tbody>
</table>

app.component.ts

import { Component } from '@angular/core';

@Component({
  selector: 'my-app',
  templateUrl: './app.component.html',
  styleUrls: [ './app.component.css' ]
})
export class AppComponent  {
  name = 'Angular';
  public none=false;
  public readonly=false;
  public full=false;
}

Answer 3

檢查更改：

<table (click)="cd.detectChanges()">
    <thead>
        <th>Role</th>
        <th colspan="3">Access</th>
    </thead>
    <tbody>
        <tr>
            <td>Select All</td>
            <td>
                <input #none type="radio" name="access0" value="allNone"/>
        <label>None</label>
      </td>
      <td>
        <input #readOnly type="radio" name="access0" value="allReadOnly"/>
        <label>Read Only</label>
      </td>
      <td>
        <input #full type="radio" name="access0" value="AllFull"/>
        <label>Full</label>
      </td>
    </tr>
    <tr>
      <td>Admin</td>
      <td>
        <input type="radio" name="access1" [value]="None" [checked]="none.checked"/>
        <label>None</label>
      </td>
      <td>
        <input type="radio" name="access1" value="ReadOnly" [checked]="readOnly.checked"/>
        <label>Read Only</label>
      </td>
      <td>
        <input type="radio" name="access1" value="Access" [checked]="full.checked"/>
        <label>Full</label>
      </td>
    </tr>
    <tr>
      <td>Sales Person</td>
      <td>
        <input type="radio" name="access2" value="None" [checked]="none.checked"/>
        <label>None</label>
      </td>
      <td>
        <input type="radio" name="access2" value="ReadOnly" [checked]="readOnly.checked"/>
        <label>Read Only</label>
      </td>
      <td>
        <input type="radio" name="access2" value="Access" [checked]="full.checked"/>
        <label>Full</label>
      </td>
    </tr>
  </tbody>
</table>

和 TS：

import {ChangeDetectorRef, Component} from '@angular/core';

@Component({
  selector: 'my-app',
  templateUrl: './app.component.html',
  styleUrls: [ './app.component.css' ]
})
export class AppComponent  {
  constructor(protected cd: ChangeDetectorRef){}
}