"No provider for MdDialogRef!" - angular-material2

Question

Suppose I have this component:
#Component({
selector: 'pizza-dialog',
template: `
<h1 md-dialog-title>Would you like to order pizza?</h1>
<md-dialog-actions>
<button (click)="dialogRef.close('yes')">Yes</button>
<button md-dialog-close>No</button>
</md-dialog-actions>
`
})
export class PizzaDialog {
constructor(public dialogRef: MdDialogRef<PizzaDialog>) { }
}
I've already imported MdDialog into my app module:
#NgModule({
imports: [
BrowserModule,
MaterialModule.forRoot(),
MdDialogModule.forRoot(),
],
...
})
Why would I get this error?
No provider for MdDialogRef!

Answer 1

You may have tried to use your dialog component in a template like this:
<pizza-dialog ...></pizza-dialog>
Delete that from your template and open the dialog using MdDialog.open() as is done here:
#Component({
selector: 'pizza-component',
template: `
<button type="button" (click)="openDialog()">Open dialog</button>
`
})
export class PizzaComponent {
dialogRef: MdDialogRef<PizzaDialog>;
constructor(public dialog: MdDialog) { }
openDialog() {
this.dialogRef = this.dialog.open(PizzaDialog, {
disableClose: false
});
this.dialogRef.afterClosed().subscribe(result => {
console.log('result: ' + result);
this.dialogRef = null;
});
}
}
This code was copied from:
https://github.com/angular/material2/blob/master/src/lib/dialog/README.md

Answer 2

You must not change your implementation.
You can provide a Mock for the MdDialogRef.
In the following example I fake the MdDialogRef with the MdDialogRefMock class and register it in the providers section:
import { async, ComponentFixture, TestBed } from "#angular/core/testing";
import { CUSTOM_ELEMENTS_SCHEMA } from "#angular/core";
import { MessageBoxYesNoComponent } from "./message-box-yes-no.component";
import { MdDialogRef } from "#angular/material";
class MdDialogRefMock {
}
describe("MessageBoxYesNoComponent", () => {
let component: MessageBoxYesNoComponent;
let fixture: ComponentFixture<MessageBoxYesNoComponent>;
beforeEach(async(() => {
TestBed.configureTestingModule({
declarations: [ MessageBoxYesNoComponent ],
schemas: [CUSTOM_ELEMENTS_SCHEMA],
imports: [
],
providers: [
{ provide: MdDialogRef, useClass: MdDialogRefMock }
]
})
.compileComponents();
}));
beforeEach(() => {
fixture = TestBed.createComponent(MessageBoxYesNoComponent);
component = fixture.componentInstance;
fixture.detectChanges();
});
it("should create", () => {
expect(component).toBeTruthy();
});
});
If you are using Jasmine, you can also create a Spy instead of creating the Fake-Class:
let mdDialogSpy = jasmine.createSpy('MdDialogRef');

Answer 3

Remove <pizza-dialog ...></pizza-dialog> from the template, it only require the button that open the Dialong because in the code you set the relation with the dialog.

Answer 4

Add MdDialogRef to providers of your module