How to get checkbox value in angular 5 app

问题

I am working on Angular checkbox and need to read value either given ng-true-value / ng-false-value or boolean value not sure what I am missing from code. I am reading event but not sure which value to read??

template

<div>

 <input 
    type="checkbox" 
    name="questionAnswerState" 
    ng-model="check"
    ng-true-value = "answerProvided"
    ng-false-value="questionAnswerNotProvided" 
    (change)="isAnswerProvided($event, check)"
    /> Answer Provided?

component

 isAnswerProvided(event: any, check:any)
  {
    console.log("question answer not provided responseId:: ",this.responseId, " questionId::",this.questionId, "  check::", check );
    console.log(event);
  }

回答1:

If you're using Angular 2> you should use the checked attribute for using one way binding, that the UI will only read the value of check. Using this method you would have to update the check value in your component.

 <input 
    type="checkbox" 
    name="questionAnswerState" 
    [checked]="check"
    (change)="isAnswerProvided($event, check)"
    /> Answer Provided?

or if you're after two way binding, where the state is controlled completely by the UI you can use ngModel like this:

 <input 
    type="checkbox" 
    name="questionAnswerState" 
    [(ngModel)]="check"
    (change)="isAnswerProvided($event, check)"
    /> Answer Provided?

来源：https://stackoverflow.com/questions/50505612/how-to-get-checkbox-value-in-angular-5-app