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<h3>Make friends</h3>
<div *ngIf="error" class="alert alert-danger">{{ error }}</div>
<form (ngSubmit)="makeFriends()" [formGroup]="form">
<div class="form-group" *ngFor="let url of urls; let id = index; trackBy:customTrackBy">
<label for="username">Url</label>
<div class="input-group">
<input
type="text" class="form-control" placeholder="http://domain.com"
[id]="'url-' + id" [formControlName]="'url-' + id"
/>
<span class="input-group-btn">
<button *ngIf="displayAddField(id)" (click)="addField()" class="btn btn-default" type="button">+</button>
<button *ngIf="displayRemoveField(id)" (click)="removeField(id)" class="btn btn-default" type="button">-</button>
</span>
</div>
<div [hidden]="form.controls['url-' + id].valid || form.controls['url-' + id].pristine" class="alert alert-warning">
It should be a valid url.
</div>
</div>
<input type="submit" value="Make friends" class="btn btn-default" [disabled]="!isFormValid()">
</form>
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