Add a spinner when Mat-table is loading?

Question

I load the data in my material table like that :

ngOnInit(){ return this.annuairesService.getMedecins().subscribe(res => this.dataSource.data = res);}

I want show the spinner when is loading : <mat-spinner ></mat-spinner>

I try : showSpinner: boolean = true;

ngOnInit(){ return this.annuairesService.getMedecins()
.subscribe(res => this.dataSource.data = res);
this.dataSource.subscribe(() => this.showSpinner = false }  

but i have this error :

src/app/med-list/med-list.component.ts(54,21): error TS2339: Property 'subscribe' does not exist on type 'MatTableDataSource<{}>'.

Answer 1

table.component.html

<table mat-table [dataSource]="dataSource" class="mat-elevation-z8">

  <!-- table here ...-->

  <tr mat-header-row *matHeaderRowDef="displayedColumns"></tr>
  <tr mat-row *matRowDef="let row; columns: displayedColumns;"></tr>
</table>

<div *ngIf="isLoading" 
   style="display: flex; justify-content: center; align-items: center; background: white;">
  <mat-progress-spinner 
    color="primary" 
    mode="indeterminate">
  </mat-progress-spinner>
</div>

table.component.ts

isLoading = true;
dataSource = null;

ngOnInit() {
    this.annuairesService.getMedecins()
       subscribe(
        data => {
          this.isLoading = false;
          this.dataSource = data
        }, 
        error => this.isLoading = false
    );
}

Live demo

Answer 2

Set showSpinner to true when you start requesting your data, and set it to false when you receive it (aka, in the subscribe of your service method)

ngOnInit() {
  this.showSpinner = true;
  this.annuairesService.getMedecins()
    .subscribe(res => {
      this.showSpinner = false;
      this.dataSource.data = res;
    });
}

Answer 3

If you want the spinner to overlay the rows, for example on paged tables, you can place the spinner overlay before the table with position: absolute. Just make sure to set position: relative on the parent container so the overlay does not extend it's parent size.

      <div class="mat-elevation-z8 mt-3" style="position: relative;">
        <div style="display: flex;
        justify-content: center;
        align-items: center;
        background: rgba(255, 255, 255, 0.6);
        position: absolute;
        width: 100%;
        height: 100%;
        z-index: 1;" *ngIf="isLoading" >
          <mat-progress-spinner color="accent" mode="indeterminate" diameter="50">
          </mat-progress-spinner>
        </div>
        <table mat-table [dataSource]="data" matSort matSortActive="createDate"
          matSortDisableClear matSortDirection="desc">
          ....
        </table>
        <mat-paginator [length]="data_count" [pageSize]="10"></mat-paginator>
      </div>