Reading radio button value - Angular 2

问题:

I'm trying to read the radio button value - in angular 2,

index.html

<input type="radio" id="options1" name="function" value="create">
<input type="radio" id="options2" name="function" value="continue">

index.ts

@Component({
    selector: 'function',
    templateUrl: './client/components/function/index.html',
    styleUrls: ['./client/components/function/index.css'],
    providers: [],
    directives: [ROUTER_DIRECTIVES]
})

I need to display a div in the html based on if radio button value is create or continue.

What I've tried:

1. Fetching values of radio button in the typescript file using document.getElementById - Property checked wasn't getting detected.
2. Reading the value using model.function by defining a model in the typescript. Unable to access the model variable, obviously!
3. Tried using [(ngModel)] - that didn't work either.

Please suggest a turnaround for this.

回答1:

template:

<input type="radio" id="options1" [(ngModel)]="myRadio" value="create">
<input type="radio" id="options2" [(ngModel)]="myRadio" value="continue">

then define a myRadio variable in your component and initialize it like this: myRadio: string = ''

this variable will get the chosen value.

and, do not use javascript to control DOM elements in Angular2, this is against the angular2 philosophy

回答2:

If you only have 2 or 3 radio options, your easiest choice is to use template reference variable, as shown below:

<input #op1 type="radio" id="options1" name="function" value="create">
<input #op2 type="radio" id="options2" name="function" value="continue">

<button (click)="fn(op1.checked ? op1.value : op2.checked ? op2.value)">Run</button>