Angular 2 Progress Spinner Material: Displays as an overlay

Question

How to display Angular 2 Material Progress Spinner as a slightly transparent overlay of the current view (page or modal dialog)?

Answer 1

I was inspired: redefining the angular size of the material and styling md-dialog-container

I solved it like this:

Create a new component

Create a new ProgressSpinnerDialogComponent component

Contents of progress-spinner-dialog.component.html:

<mat-spinner></mat-spinner>

Contents of progress-spinner-dialog.component.ts:

import { Component, OnInit } from '@angular/core';

@Component({
  selector: 'app-progress-spinner-dialog',
  templateUrl: './progress-spinner-dialog.component.html',
  styleUrls: ['./progress-spinner-dialog.component.css']
})
export class ProgressSpinnerDialogComponent implements OnInit {

  constructor() { }

  ngOnInit() {
  }

}

Add style

In styles.css add:

.transparent .mat-dialog-container {
    box-shadow: none;
    background: rgba(0, 0, 0, 0.0);
}

Use component

Here is an example of using a progress counter:

import { Component, OnInit } from '@angular/core';
import { MatDialog, MatDialogRef } from "@angular/material";
import { Observable } from "rxjs";
import { ProgressSpinnerDialogComponent } from "/path/to/progress-spinner-dialog.component";

@Component({
  selector: 'app-use-progress-spinner-component',
  templateUrl: './use-progress-spinner-component.html',
  styleUrls: ['./use-progress-spinner-component.css']
})
export class UseProgressSpinnerComponent implements OnInit {

  constructor(
    private dialog: MatDialog
  ) {
    let observable = new Observable(this.myObservable);
    this.showProgressSpinnerUntilExecuted(observable);
  }

  ngOnInit() {
  }

  myObservable(observer) {
    setTimeout(() => {
      observer.next("done waiting for 5 sec");
      observer.complete();
    }, 5000);
  }

  showProgressSpinnerUntilExecuted(observable: Observable<Object>) {
    let dialogRef: MatDialogRef<ProgressSpinnerDialogComponent> = this.dialog.open(ProgressSpinnerDialogComponent, {
      panelClass: 'transparent',
      disableClose: true
    });
    let subscription = observable.subscribe(
      (response: any) => {
        subscription.unsubscribe();
        //handle response
        console.log(response);
        dialogRef.close();
      },
      (error) => {
        subscription.unsubscribe();
        //handle error
        dialogRef.close();
      }
    );
  }
}

Add it to app.module

 declarations: [...,ProgressSpinnerDialogComponent,...],
 entryComponents: [ProgressSpinnerDialogComponent],

Answer 2

HTML

<div style="height:800px" [class.ops]="show">
   <h2 [class.opaque]="trans">{{name}}</h2>
   <button class="btn btn-success" (click)="toggleSpinner()"> See spinner </button>
</div>
<spinner [show]="show" [size]="150"> </spinner>

import { Component, Input } from '@angular/core';

@Component({
    selector: 'spinner',
    template: `
      <div *ngIf="show">
          <span>
           <i class="fa fa-spinner fa-spin" [ngStyle]="{'font-size': size+'px'}" aria-hidden="true"></i>
          </span>
      </div>
    `
})
export class SpinnerComponent {
    @Input() size: number = 50;
    @Input() show: boolean;

    toggleSpinner() {
       this.show = !this.show;
       this.trans=!this.trans;
    }

}

CSS

.ops {
  opacity :0;
}

LIVE DEMO

Answer 3

: , - , - . , , :

<app-dialog-spinner *ngIf="progressSpinner"></app-dialog-spinner>

* ngIf . , , - , .

Dialog Spner:

import { Component, OnInit, OnDestroy } from '@angular/core';
import { MatDialog, MatDialogRef } from '@angular/material';

// Requires a transparent css (panel)id in a parent stylesheet e.g.:
// #DialogSpinnerComponent {
//   box-shadow: none !important;
//   background: transparent !important;
// }

@Component({
  selector: 'app-do-not-use',
  template: '<mat-spinner></mat-spinner>',
  styles: []
})
export class DialogSpinnerDialogComponent { }

@Component({
  selector: 'app-dialog-spinner',
  template: '',
  styles: []
})
export class DialogSpinnerComponent implements OnInit, OnDestroy {

  private dialog: MatDialogRef<DialogSpinnerDialogComponent>;

  constructor(
    private matDialog: MatDialog,
  ) { }

  ngOnInit() {
    setTimeout(() => {
      this.dialog = this.matDialog.open(DialogSpinnerDialogComponent, { id: 'DialogSpinnerComponent', disableClose: true });
    });
  }
  ngOnDestroy() {
    setTimeout(() => {
      this.dialog.close();
    });
  }

}

, , DialogSpinnerDialogComponent entryComponents. CSS . , , .