MatDialog not displayed correctly

Question

I'm trying to use a MatDialog and based on this example I've implemented that dialog as follows:

import {Component, Inject, OnInit} from '@angular/core';
import {Router} from '@angular/router';
import {AuthenticationService} from '../../../service/authentication.service';
import {MAT_DIALOG_DATA, MatDialog, MatDialogRef} from '@angular/material';

@Component({
  selector: 'app-home',
  templateUrl: './home.component.html',
  styleUrls: ['./home.component.css']
})
export class HomeComponent {

  constructor(private router: Router, public dialog: MatDialog) { }

  openDialog(): void {
    const dialogRef = this.dialog.open(CreateGroupDialogComponent);
  }    
}

@Component({
  selector: 'app-create-group-dialog',
  template: `
    <span>Hello World!</span>
  `
})
export class CreateGroupDialogComponent {
  constructor(public dialogRef: MatDialogRef<CreateGroupDialogComponent>) {  }
}

However, even though the dialog comes up as I press the according button, what I get it this:

The HTML template gets not displayed and the dimensions of the modal is wrong.

I don't see what the problem is. Why is the modal not correctly drawn?

This is the generated HTML code when opening the modal. As can be seen it's empty.

Answer 1

You need to add it to entryComponents on your @NgModule

import { BrowserModule } from '@angular/platform-browser';
import { BrowserAnimationsModule } from '@angular/platform-browser/animations';
import { NgModule } from '@angular/core';
import { MatDialogModule, MatButtonModule } from '@angular/material';

import { AppRoutingModule } from './app-routing.module';

import { AppComponent } from './app.component';
import { LoginComponent } from './login/login.component';
import { HomeComponent, DialogOverviewExampleDialogComponent } from './home/home.component';


@NgModule({
  declarations: [
    AppComponent,
    LoginComponent,
    HomeComponent,
    DialogOverviewExampleDialogComponent
  ],
  imports: [
    BrowserModule,
    BrowserAnimationsModule,
    AppRoutingModule,
    MatDialogModule,
    MatButtonModule
  ],
  providers: [],
  bootstrap: [AppComponent],
  entryComponents: [
    DialogOverviewExampleDialogComponent
  ]
})
export class AppModule { }

Dup of Angular2 material dialog has issues - Did you add it to @NgModule.entryComponents?

Answer 2

with the new since 9.0 ivy Compiler the entryComponents field is no longer necessary and has been deprecated.

I simply fixed this issue by restarting my ng serve.