Encountered an issue when integrating dialogs into a service intended for use across multiple components. Interestingly, the error only surfaced after relocating the dialogs to the service. The fix involved including a personalized provider named MatDialogRef in the primary module.

  import { DialogService } from './services/dialog.service';
  import { MatDialogModule, MatDialogRef } from '@angular/material/dialog';
  ...
  imports: [
    ...
    MatDialogModule
  ],
  providers: [
     {
       provide: MatDialogRef,
       useValue: {}
     },
     DialogService
  ],
  ...

Integrating this custom provider enabled the service to function as a singleton with accessible shared dialogs, effectively resolving the provider-related error.

Consider this scenario where you are utilizing app-checkout

This issue may arise if you are using a component in both 'dialog' and 'normal' ways by adding app-checkout in a normal HTML file.

Here are two solutions to address the issue:

Solution 1: Remove

<app-checkout> </app-checkout>

Solution 2 involves using the component in both dialog and HTML files. Instead of the previous approach, consider injecting it to make it optional:

// ... something with selector: "app-checkout",
 constructor(
    public dialogRef: MatDialogRef<CheckoutComponent>,
    @Inject(MAT_DIALOG_DATA) public dialogData: any
  ) {}

One way to do this injection is:

  constructor(
    // Use @Optional() before the public dialogRef 
    @Optional() public dialogRef: MatDialogRef<CheckoutComponent>, 
    @Inject(MAT_DIALOG_DATA) public dialogData: any
  ) {

  }

Alternatively, you could approach it like this:

// ... same as above
  private dialogRef = null;
  private dialogData;
  constructor(private injector: Injector) {
      this.dialogRef = this.injector.get(MatDialogRef, null);
      this.dialogData = this.injector.get(MAT_DIALOG_DATA, null);
  }

To make your dialogRef declaration optional, simply include @Optional() before it.

Here's an example to illustrate:

constructor(
    @Optional() public dialogRef: MatDialogRef<yourDialogComponentName>
) {
}

If you encounter this Error, here is how to fix it:

1. First, ensure that you have included the import statement in the typescript file like so:

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

2. Next, check the constructor:

     constructor(@Optional() public dialogRef: MatDialogRef<GadgetAuthMessagesComponent>, @Inject(MAT_DIALOG_DATA) public message: string){ }
   

3. Now, navigate to the module.ts file and verify the imports:

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

4. In the module.ts file, make sure to add MatDialogModule to the imports array:

   MatDialogModule

5. Finally, update the providers array as follows:

      providers:
    [{
      provide: 'gadget-mlt',
      useValue: GadgetMltComponent,
  },
        {provide:MatDialogRef , useValue:{} },

        { provide: MAT_DIALOG_DATA, useValue: {} }

  ],

After following these steps, the issue should be resolved. I hope this solution benefits someone!

For Angular 12, you can use "@Optional()" before injecting mat dialog as shown below:

@Optional() @Inject(MAT_DIALOG_DATA) public data:any

In the main app module, include the following code:

providers: [
    {
      provide: MatDialogRef,
      useValue: {}
    }
],

Thank you.

If your Angular animations are not working, it may be because you have not included a Web Animations API polyfill. This API is essential for Angular animations to function properly as they rely on it.

You can check browser support for the Web Animations API on Can I Use. Currently, only Chrome, Firefox, and Opera natively support this API.

To fix this issue, follow these steps:

1. Open your terminal and run the following command:

   npm install web-animations-js
   

2. After installation, make sure to uncomment the line related to Angular Animations in your polyfills.ts file or add it if it's missing:

   import 'web-animations-js'; // Uncomment this line
   

Alternatively, you can import specific modules from separate endpoints like this:

Change this code snippet:

import { MatButtonModule, MatDialogModule } from '@angular/material';

To:

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

• Simply import MatDialogModule from angular/material in your module, no need for MatDialogRef.
• In your code where DialogComponent imports {MAT_DIALOG_DATA, MatDialog, MatDialogRef} from '@angular/material';
• I have followed the above steps and unsure why importing from Dialog is necessary.
• Please specify the selector used in your html/template. Using a different selector than expected can result in errors. I experienced the same issue when mistakenly using 'dialog-overview-example-dialog' instead of 'dialog-overview-example', causing the error you encountered.

After encountering an issue with my Dialog component, I decided to test it by adding it to a different HTML Template. However, once I removed it from there, the error disappeared and the component started functioning properly.

It is essential that the imported paths in both the component.ts and spec.ts files match perfectly

Here's an example:

// Ensure consistency between component and spec files
import { MatDialogRef } from '@angular/material/dialog';

Alternatively, it could be:

// Make sure to sync imports in component and spec files
import { MatDialogRef } from '@angular/material';

Offering a solution that may help! If you encounter the NullInjectorError: No provider for MatDialogRef, MatDialogData error while testing (.spec.ts) files (which happened to me), simply include the following code:

imports: [MatDialogModule],
providers: [
    { provide: MatDialogRef, useValue: {} },
    { provide: MAT_DIALOG_DATA, useValue: {} },
 ],

within the TestBed.configureTestingModule of your component.

Exclude dialogRef from the constructor:

https://example.com/edit/angular-dialog-update?file=src%2Fapp%2Fapp.component.ts

In addition to the aforementioned points, it is possible to encounter this error if there are references to the Component selector in any of the template files within your application. Keep in mind that MatDialog Components should only be called using the MatDialog.dialog.open() method, and not through the component selector.

Unfortunately, this same error message can be triggered by various factors.

This issue might occur due to the injection of MatDialogRef in the wrong component when calling MatDialog::open. It is crucial that the component passed to the MatDialog open method correctly injects MatDialogRef in its constructor, just like demonstrated in this example.

@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: DialogData) {}

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

}

Encountering this issue several times, I found that the problem arose when attempting to incorporate optional data into a modal. To resolve this, I included a snippet of code within the parent module responsible for displaying the dialog/modal.

Upon testing this solution within the context of implementing providers in the app.module.ts (or even higher up the hierarchy), I confirmed that it still functions as intended.

// direct.parent.module.ts

// Import statements
import{...} from '';
import{<YOUR_COMPONENT>} from 'YOUR_COMPONENT_PATH';
...

@NgModule({
  declarations: [..],
  imports:[..],
  providers: [ // <== This is the key that made it work
    {
      provide: MatDialogRef,
      useValue: {}
    },
    { provide: MAT_DIALOG_DATA, useValue: {} }, // <== I had to add this too
    <YOUR_COMPONENT> // My Component
  ],
})

export class DirectParentModule { }

Make sure you are not using a dummy MatDialogRef, as it will prevent you from properly utilizing it within the dialog component. If you attempt to close the modal, the material may try to call .close() on an empty object due to the

provide: MatDialogRef, useValue: {}

Check your module setup (details above) & imports.

In my situation, I mistakenly imported Dialog from cdk instead of MatDialog from material.

import { Dialog } from "@angular/cdk/dialog"; // incorrect
...
constructor(private dialog: Dialog) {}

import { MatDialog } from "@angular/material/dialog"; // correct
...
constructor(private dialog: MatDialog) {}

To enhance functionality in app.module.ts, make sure to include MatDialogRef and MAT_DIALOG_DATA within the providers array, and ensure that they are imported in the same module:

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

...
imports: [MatDialogModule],
providers: [
    { provide: MatDialogRef, useValue: {} },
    { provide: MAT_DIALOG_DATA, useValue: {} },
 ],
...

It turns out that everything was running smoothly in my code. The problem arose because during development, I had set up a temporary route for my modal component so I could preview it just like any other regular component or view. Within the component, there was a button that triggered opening itself in a modal window so I could test how it appeared when actually opened.

In order to resolve the issue, I decided to move the code responsible for opening the Dialog to a separate component, which successfully resolved the problem.

The reason behind this issue is often the absence of necessary modules. Make sure to import the external module into your own module when utilizing its component. This step should help resolve the issue.

By including the MatDialogModule in my app.module.ts file, I was able to successfully resolve the issue at hand.

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

There were two instances where I faced this issue:

1. One scenario was when working with Standalone Application/Components. While using MatDialog was fine, I encountered difficulties with MatDialogRef. Switching to the original CDK DialogModule resolved the issue seamlessly.

2. The other situation arose when utilizing path alias in Angular 13. Components imported via path alias were incompatible with MatDialog or MatDialogRef. Reverting to regular imports resolved the issue.

To summarize, it is advisable to avoid importing MatDialog components with path alias and for standalone applications, opt for CDK DialogModule, Dialog, DialogRef to ensure smooth functionality. The configurations remain mostly consistent across these solutions.