Hello there, anyone can help me with this?
I want to check for duplicate username on my ion-input and show “Username is taken.” when there is duplicate username found in my firebase. I’ve used the *ngIf for this, but I encountered a problem which that the *ngIf would not be gone even when I’ve entered the correct username. Please help me with this.
Thank you in advance 
- For your information, here is my code:
<ion-input (ionChange)="checkForUser(username)" [(ngModel)]="username" name="username" type="text" placeholder="NRIC as username" formControlName="username"></ion-input>
<p *ngIf="checkForUsername" style="color: red;">Username is taken.</p>
checkForUser(username){
this.checkForUsername;
this.users.subscribe(item=>{
for(var i=0; i<item.length;i++){
if(this.username.toLowerCase() === item[i].username.toLowerCase()){
this.checkForUsername = !this.checkForUsername;
}
}
})
}