javascript - 选择单选按钮时设置默认值

Question

我有一个带有单选按钮的表单，如果用户选择否，则应将默认值 s'0' 添加到输入标记中，我尝试在使用 value= 加载表单时将 0 设置为默认值'0'，但加载表单时不会反射(reflect)该值。

     <form #form="ngForm" (ngSubmit)="modifyMilkForm(form)" novalidate>
        <ion-row>
                    <ion-col style="text-align: right;">
                         <ion-label><b>Today Received :</b></ion-label>
                    </ion-col>

                    <ion-col>
                        <ion-list radio-group name="checkBox" [(ngModel)]="autoManufacturers">
                            <ion-item>
                                <ion-label>Yes</ion-label>
                                <ion-radio  [value]="true"></ion-radio>
                            </ion-item>
                            <ion-item>
                                <ion-label>No</ion-label>
                                <ion-radio  [value]="false"></ion-radio>
                            </ion-item>
                        </ion-list>
                    </ion-col>
                </ion-row>

                <ion-row>
                    <ion-col style="text-align: right;" >
                         <ion-label><b>Price :</b></ion-label>
                    </ion-col>
                    <ion-col>
                         <ion-item name="price" [(ngModel)]="enteredPrice" required> 
                            <ion-input type="number" value="0"  placeholder="Number"></ion-input>
                        </ion-item>  
                    </ion-col>
                </ion-row>
<button small [disabled]=!form.valid style="text-transform: none" ion-button type="submit" value="Submit" small>Submit</button>
</form>

有人可以帮我解决这个问题吗

Answer 1

这里是

class initRadioGroup {
  selectedRadio = {"value":"N"};
}

<md-radio-group class="form-control" [(ngModel)]="selectedRadio.value" 
                id="radioList" formControlName="selectedRadio">
  <md-radio-button [value]="'N'">N</md-radio-button>
  <md-radio-button [value]="'M'">M</md-radio-button>
</md-radio-group>