angular dialog open is not working

Question

I have just started learning Angular 5 and I just need to open a dialog box on a button click. Application is unable to build and the error I am coming up is 'error ts2339 property dialog does not exist on type Dashboardcomponent' I have then installed angular material and cdk. It's still coming up with the same error when compiling. And the on the html page(localhost:4200), the error I am getting is 'Cannot read property 'open' of undefined'. How can I get the dialog and open working on angular?

typscript:

import { Component, OnInit } from '@angular/core';
import { WebapiService } from '../providers/webapi.service';
import { MatDialog, MatDialogRef } from '@angular/material';
import { ServerDialogComponent } from '../server-dialog/server-dialog.component';

@Component({
  selector: 'app-dashboard',
  templateUrl: './dashboard.component.html',
  styleUrls: ['./dashboard.component.scss']
})
export class DashboardComponent implements OnInit {

  constructor(private webApi: WebapiService) { }

  ngOnInit() {
  }

  openServerDialog() {

    const serverDialogRef = this.dialog.open(ServerDialogComponent, {
      width: '250px',
      data: { serverlist: this.webApi.getServerList() }
    });
  }
}

html:

<div class="main-content">
  <div class="container-fluid">
    <button mat-fab color="warning" (click)="openServerDialog()">open</button>
  </div>
</div>

Answer 1

You need to create a dialog within your constructor, without this.dialog.open(...) results in Cannot read property 'open' of undefined:

constructor(public dialog: MatDialog, private webApi: WebapiService) {
}

Answer 2

First import MatDialogModule in AppModule

import {MatDialogModule} from '@angular/material/dialog';
import { BrowserModule } from '@angular/platform-browser';
import { NgModule } from '@angular/core';

import { AppComponent } from './app.component';

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

HTml File

<button mat-raised-button (click)="openServerDialog()">Pick one</button>

TS file

import { WebapiService } from '../providers/webapi.service';
import {Component, Inject,OnInit } from '@angular/core';
import {MatDialog, MatDialogRef, MAT_DIALOG_DATA} from '@angular/material';
import { ServerDialogComponent } from '../server-dialog/server-dialog.component';

@Component({
  selector: 'app-dashboard',
  templateUrl: './dashboard.component.html',
  styleUrls: ['./dashboard.component.scss']
})
export class DashboardComponent implements OnInit {

  constructor(public dialog: MatDialog,private webApi: WebapiService) { }

  ngOnInit() {
  }

  openServerDialog() {

    let serverDialogRef = this.dialog.open(ServerDialogComponent, {
      width: '250px',
      data: { serverlist: this.webApi.getServerList() }
    });
  }
}

ServerDialogComponent ts file

@Component({
  selector: 'server_dialog_component ',
  templateUrl: 'server_dialog_component.html',
})
export class ServerDialogComponent {

  constructor(
    public dialogRef: MatDialogRef<ServerDialogComponent>,
    @Inject(MAT_DIALOG_DATA) public data: any) { }

  onNoClick(): void {
    this.dialogRef.close();
  }

}