No provider for MatDialogRef

Question

I am using material 2 version 2.0.0-beta.12. I need to adjust the position of the material Modal. I followed this answer to do that. https://stackoverflow.com/a/44238699/8253445 Since MdDialog is not available now I used {MatDialog, MatDialogRef, MAT_DIALOG_DATA}.

constructor(public dialog: MatDialog,public dialModRef:MatDialogRef<any>) {}

When I add MatDialogRef to my constructor it gives me the error:

No provider for MatDialogRef

dialog-overview-example.ts

import {Component, Inject} from '@angular/core';
import {MatDialog, MatDialogRef, MAT_DIALOG_DATA} from
'@angular/material';

@Component({
    selector: 'dialog-overview-example',
    templateUrl: 'dialog-overview-example.html'
})
export class DialogOverviewExample {

    animal: string;
    name: string;

    constructor(public dialog: MatDialog,public
    dialModRef:MatDialogRef<any>) {}

    openDialog(): void {
        let dialogRef = this.dialog.open(DialogOverviewExampleDialog, {
        width: '500px',
        data: { name: this.name, animal: this.animal }
    });

    dialogRef.afterClosed().subscribe(result => {
        console.log('The dialog was closed');
        this.animal = result;
    });
    }
}

@Component({
    selector: 'dialog-overview-example-dialog',
    templateUrl: 'dialog-overview-example-dialog.html',
})
export class DialogOverviewExampleDialog {

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

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

app.module.ts

entryComponents: [DialogOverviewExample,DialogOverviewExampleDialog]

dialog-overview-example-dialog.html

<h1 md-dialog-title>Hi {{data.name}}</h1>
<div md-dialog-content>
    <p>What's your favorite animal?</p>
    <md-form-field>
    <input mdInput tabindex="1" [(ngModel)]="data.animal">
    </md-form-field>
</div>
<div md-dialog-actions>
    <button md-button tabindex="2">Ok</button>
    <button md-button (click)="onNoClick()" tabindex="-1">No Thanks</button>
</div>

Answer 1

You will get that exact

No provider for MatDialogRef

error in case you include your dialog's component html selector in dialog-overview-example.html like <dialog-overview-example-dialog></dialog-overview-example-dialog>

There is no need for that, do not include the html selector of the dialog component anywhere.

Answer 2

You need to import this module in your module file (app.module.ts by default):

import { MatDialogModule } from '@angular/material/dialog';

and add MatDialogModule to imports in your module declaration:

@NgModule({
  declarations: [...],
  imports: [
    ...
    MatDialogModule,
    ...
  ],
  providers: [...],
  entryComponents: [...],
  bootstrap: [...]
})

EDIT:

You need to pass data through this.dialogRef.close(); to get result in subscribe working. For example:

@Component({
   selector: 'dialog-overview-example-dialog',
   templateUrl: 'dialog-overview-example-dialog.html',
})
export class DialogOverviewExampleDialog {
someValue: boolean = false;

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

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

}

Answer 3

Update 2021

The Angular bug that caused the error No provider for MatDialogRef when importing from @angular/material/dialog has been fixed.

The correct way to import MatDialogRef is once again to use the specific component entry point:

import {MatDialog} from '@angular/material/dialog';

Angular Material Module

import {MatDialogModule} from '@angular/material/dialog';

@NgModule({
  exports: [
    MatDialogModule,
    ...
  ]
})
export class MyMaterialModule {}

 

Original Answer September 2019

Many of the Angular Material examples show the MatDialogRef import as:

import {MatDialog, MatDialogRef, MAT_DIALOG_DATA} from '@angular/material/dialog';

This will cause the following **error** (for example, when creating a Service to wrap the creation of Dialog Components):

ERROR NullInjectorError: StaticInjectorError(AppModule)[DialogComponent -> MatDialogRef]: 
  StaticInjectorError(Platform: core)[DialogWarningComponent -> MatDialogRef]: 
    NullInjectorError: No provider for MatDialogRef!

Correct Import: '@angular/material'

import {MatDialog, MatDialogRef, MAT_DIALOG_DATA} from '@angular/material';

Answer 4

You injected MatDialogRef in the constructor of DialogOverviewExample component that opens your dialog, but it is not a dialog.

MatDialogRef can be inject only in components opened as dialog, other way there is no dialogRef so this error is triggered.

Answer 5

The issue is that you are including your <dialog-component></dialog-component> in your code somewhere as well as injecting it into your view with @Inject. If you remove your <dialog-component></dialog-component> from whichever template.html you had it in, It will work!

Answer 6

Remove MatDialogRef from DialogOverviewExample component. You don't need it there. It should work then.

Answer 7

I faced to that issue in 2023 in application which is based on Angular 15.

The change of an import path solved problem. Try this:

import { MatLegacyDialogRef as MatDialogRef, MAT_LEGACY_DIALOG_DATA as MAT_DIALOG_DATA } from '@angular/material/legacy-dialog';

then constructor stays the same:

  constructor(
    public myDialogRef: MatDialogRef<UserDialogComponent>,
    @Inject(MAT_DIALOG_DATA) public modalData: any
  ) {}

Hope this helps.