I looked everywhere for a solution I could just copy and paste into my project but with no luck, so here's my attempt at providing it for the next poor soul stuck in my situation. I've tried to keep the code as simple as possible.
league_details: this.fb.group({
name: "",
founder: ""
})
this.leagueForm = this.fb.group({
league_details: this.fb.group({
name: "",
founder: ""
}),
teams: this.fb.array([this.teams])
});
get teams(): FormGroup {
return this.fb.group({
team_name: "",
players: this.fb.array([this.players])
});
}
get players(): FormGroup {
return this.fb.group({
player_name: "",
player_number: ""
});
}
<form [formGroup]="leagueForm">
<div class="form-header" formGroupName="league_details">
<label>League Name <input formControlName="name"/></label>
<label>Founder <input formControlName="founder"/></label>
</div>
It's VITAL you have a wrapping div that defines formArrayName!
<div formArrayName="teams">
<div class="teams" *ngFor="let team of leagueForm.get('teams').controls;
let teamIndex = index" [formGroupName]="teamIndex">
<label>Team Name <input formControlName="team_name"/></label>
<!-- div with formArrayName='players' goes here (see below) -->
</div>
</div>
Again, important you have a wrapping div with formArrayName. Also, you need to add players in context of the team. Notice in ngFor i am referencing the team variable defined in the ngFor loop above for teams. I will also need to reference this team when removing or adding players.
Also notice the <span> element, this is how you reference the field for validation functionality.
<div formArrayName="players">
<div class="players" *ngFor="let player of team.get('players').controls;
let playerIndex=index" [formGroupName]="playerIndex">
<label>Player Name <input formControlName="player_name" />
<label>Player Number <input formControlName="player_number"/></label>
<span *ngIf="player.get('player_number').touched">touched!</span>
</div>
</div>
Place ADD button just above the div that defines the formArrayArrayName teams
<button type="button" (click)="addTeam()">Add Team</button>
addTeam() {
(this.leagueForm.get("teams") as FormArray).push(this.teams);
}
Place ADD button just above the div that defines the formArrayName players, and remember to pass in the team variable from the enclosing ngFor loop.
<button type="button" (click)="addPlayer(team)">Add Player</button>
addPlayer(team) {
team.get("players").push(this.players);
}
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