带有 select 列表的 ngModel

Question

我在从 select 元素输出值时遇到问题。

<select 
([ngModel])="office_hour_start" 
name="office_hour_start">
  <option 
    *ngFor="let time of times"
    value="{{time.i}}">
    {{ time.i }}
  </option>
</select>

这个设置在这里对我有用：

<select 
  [(ngModel)]="employee_id" 
  name="employee_id" 
  class="form-control">
    <option 
      *ngFor="let employee of employees"
      value="{{employee.id}}">
      {{ employee.name }}
    </option>
</select>

Answer 1

    <select ng-options="time as time.i for time in office_hour_start track by time.id" ng-model="selected">
<option value="{{time.i}}">{{time.i}}</option>
</select>

希望这有帮助，使用 ng-options 而不是 ng-for

Answer 2

关于适合您的设置，另外一个建议是：

// When using an ngModel, an event emitter () should be inside the input [] always 
// Though there is an instance where you can use it separately [ngModel] for Input (ngModelChange) for event emitter
<select [(ngModel)]="employee_id"           
        name="employee_id" 
        class="form-control">

    <option *ngFor="let employee of employees"
            value="{{employee.id}}">       // use [value]="employee.id" if you're assigning a dynamic value
        {{ employee.name }}
    </option>

</select>

And for the case of the office_hour_start is its ngModel. You used ([ngModel])="office_hour_start" instead of [(ngModel)]="office_hour_start" putting the parenthesis inside the brackets [] is the way to fix it.

已创建Stackblitz Demo供您参考

带有 select 列表的 ngModel

ngModel with select list

html

angularjs

drop-down-menu

typescript

angular-ngmodel