How come ngModel isn't updating the value of a string within an Angular context?

Check out the template for this component:

<form>
    <label>Id: </label>
    <input type="text" [(ngModel)]="t" (keyup.enter)="Up()">
    <label for="pass">Password: </label>
    <input type="password" id="pass">
</form>

Here is the TypeScript file for the component:

import { Component } from '@angular/core';

@Component({
    selector: 'app-login',
    templateUrl: './login.component.html',
    styleUrls: ['./login.component.scss']
})
export class LoginComponent {
    t:string='';

    Up(){
        console.log(this.t);
    }
}

Now, let's take a look at the app.module.ts file:

import { NgModule } from '@angular/core';
import { BrowserModule } from '@angular/platform-browser';
import { FormsModule } from '@angular/forms';

import { AppRoutingModule } from './app-routing.module';
import { AppComponent } from './app.component';
import { LoginComponent } from './login/login.component';

@NgModule({
    declarations: [
        AppComponent,
        LoginComponent
    ],
    imports: [
        BrowserModule,
        AppRoutingModule,
        FormsModule
    ],
    providers: [],
    bootstrap: [AppComponent]
})
export class AppModule { }

After running the application and entering text into the field and pressing enter, an empty string is printed. Even with FormsModule added in the app module, the t variable does not change value. I attempted using t!:string, but that did not solve the issue either.

Answer №1

I have created a StackBlitz demo for you to check out. After running it, an error message popped up:

ERROR
Error: NG01352: If ngModel is used within a form tag, either the name attribute must be set or the form
control must be defined as 'standalone' in ngModelOptions.

Example 1: <input [(ngModel)]="person.firstName" name="first">
Example 2: <input [(ngModel)]="person.firstName" [ngModelOptions]="{standalone: true}">

This means that one of the suggested solutions needs to be implemented. I decided to remove the <form> tag, and now when I type something and press enter, it logs it to the console correctly. You can view the final working version on this StackBlitz link.

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