What causes the unexpected behavior of MatPaginator within an ngIf statement?

Question

What causes the unexpected behavior of MatPaginator within an ngIf statement?

Here's the material table setup I'm working with:

<table mat-table [dataSource]="dataSource" >
    ... Rows ...
    <tr mat-header-row *matHeaderRowDef="displayedColumns"></tr>
    <tr mat-row *matRowDef="let row; columns: displayedColumns;"></tr>
</table>  
<mat-paginator #MatPaginator [pageSizeOptions]="[4]" showFirstLastButtons></mat-paginator>

I want to hide the table when the variable info is false.

Strategy 1:

<table *ngIf="info" mat-table [dataSource]="dataSource" >

This approach works, but pagination malfunctions when all rows are displayed on one page.

Strategy 2:

<table [hidden]="!info" mat-table [dataSource]="dataSource" >

Although this makes pagination work, the table still appears empty when info is false.

Strategy 3:

I attempted wrapping the entire table in a div and using *ngIf, but encountered the same issue as Strategy 1.

Even trying [hidden] on the div didn't solve the problem.

UPDATE: Strategy 4:

By directly applying the CSS style="display:none" to the enclosing div, I faced the same dilemma as in Strategy 3 - the table shows up even without data.

Any suggestions on how to properly hide the table when info is false while ensuring functional pagination?

Appreciate any insights!

css angular typescript pagination angular-material

Answer 1

Answer №1

Here is a recommended approach

 [hidden]="true"

<div [hidden]="true" >
  <table mat-table [dataSource]="dataSource" >
      <ng-container matColumnDef="test">
        <th mat-header-cell *matHeaderCellDef> Test. </th>
          <td mat-cell *matCellDef="let exp"> {{exp}} </td>
      </ng-container>
      <tr mat-header-row *matHeaderRowDef="displayedColumns"></tr>
      <tr mat-row *matRowDef="let row; columns: displayedColumns;"></tr>
  </table>  
  <mat-paginator #MatPaginator [pageSizeOptions]="[2, 4, 6]" showFirstLastButtons> 
  </mat-paginator>
<div>

Explore the demo on StackBlitz

Remember to adjust your condition in [hidden]

Answer 2

Here is a recommended approach

 [hidden]="true"

<div [hidden]="true" >
  <table mat-table [dataSource]="dataSource" >
      <ng-container matColumnDef="test">
        <th mat-header-cell *matHeaderCellDef> Test. </th>
          <td mat-cell *matCellDef="let exp"> {{exp}} </td>
      </ng-container>
      <tr mat-header-row *matHeaderRowDef="displayedColumns"></tr>
      <tr mat-row *matRowDef="let row; columns: displayedColumns;"></tr>
  </table>  
  <mat-paginator #MatPaginator [pageSizeOptions]="[2, 4, 6]" showFirstLastButtons> 
  </mat-paginator>
<div>

Explore the demo on StackBlitz

Remember to adjust your condition in [hidden]

Answer 3

Answer №2

To dynamically add a class and use it to hide a table, you can utilize ngClass as shown below:

[ngClass]="{'hidden': !info}"

Add the following CSS rules in your style.css file:

.hidden{
display:none;
}

Check out this demo for a working example.

Answer 4

To dynamically add a class and use it to hide a table, you can utilize ngClass as shown below:

[ngClass]="{'hidden': !info}"

Add the following CSS rules in your style.css file:

.hidden{
display:none;
}

Check out this demo for a working example.

Answer 5

Answer №3

Placing the paginator within a ngIf is not recommended because it may lead to

this.dataSource.paginator = this.paginator

resulting in this.paginator being undefined. While there is a workaround available if you absolutely must use ngIf (let me know if it's essential), I suggest opting for hidden instead.

Answer 6

Placing the paginator within a ngIf is not recommended because it may lead to

this.dataSource.paginator = this.paginator

resulting in this.paginator being undefined. While there is a workaround available if you absolutely must use ngIf (let me know if it's essential), I suggest opting for hidden instead.

Answer 7

Answer №4

Here is a solution using Angular 8:

[hidden] can replace *ngIf, and tab activation can be achieved through CSS properties.

 .tableClass .mat-tab-group.mat-primary .mat-ink-bar {
          width: 160px !important;
        }

<div [hidden]="true" class="tableClass">
     <mat-tab-group>
        <mat-tab label="Tab1">
        </mat-tab>
        <mat-tab label="Tab2">
        </mat-tab>
     </mat-tab-group>
</div>

Answer 8

Here is a solution using Angular 8:

[hidden] can replace *ngIf, and tab activation can be achieved through CSS properties.

 .tableClass .mat-tab-group.mat-primary .mat-ink-bar {
          width: 160px !important;
        }

<div [hidden]="true" class="tableClass">
     <mat-tab-group>
        <mat-tab label="Tab1">
        </mat-tab>
        <mat-tab label="Tab2">
        </mat-tab>
     </mat-tab-group>
</div>

Answer 9

Answer №5

When faced with a similar issue, I encountered difficulties implementing pagination while using *ngIf and async pipe in my template. However, after conducting some research, I found a solution that involved utilizing the @ViewChild annotation and creating a set function. I have shared my comprehensive solution below to assist others facing the same challenge.

I found that the suggested 'hidden' solution from other replies did not resolve my problem.

Within my component.ts file:

constructor(private cdRef: ChangeDetectorRef) { }

  private paginator: MatPaginator;
  /*
   Using @ViewChild due to ngIf with async pipe on the template 
   Upon emitting data for the first time from the observable, it is necessary to connect the
   pagination component with the datasource. This can be achieved as shown below.
  */
  @ViewChild(MatPaginator) set matPaginator(mp: MatPaginator) {
    if(mp) {
      this.paginator = mp;
      this.dataSource = new MatTableDataSource<any>(your_data);
      this.dataSource.paginator = this.paginator;
      this.cdRef.detectChanges();
     }
   }

and within my template file:

// incorporating the async pipe with my observable
  <div *ngIf="raceList$ | async as races">
    <div class="mat-table-width">
      <table mat-table [dataSource]="dataSource">
      ...
      </table>
      <mat-paginator [pageSizeOptions]="[10, 20, 30]"
                      showFirstLastButtons
                      aria-label="select page of races">
      </mat-paginator>
    </div>
  </div>

By implementing this approach, I successfully resolved the pagination issue and effectively displayed the table data.

Answer 10

When faced with a similar issue, I encountered difficulties implementing pagination while using *ngIf and async pipe in my template. However, after conducting some research, I found a solution that involved utilizing the @ViewChild annotation and creating a set function. I have shared my comprehensive solution below to assist others facing the same challenge.

I found that the suggested 'hidden' solution from other replies did not resolve my problem.

Within my component.ts file:

constructor(private cdRef: ChangeDetectorRef) { }

  private paginator: MatPaginator;
  /*
   Using @ViewChild due to ngIf with async pipe on the template 
   Upon emitting data for the first time from the observable, it is necessary to connect the
   pagination component with the datasource. This can be achieved as shown below.
  */
  @ViewChild(MatPaginator) set matPaginator(mp: MatPaginator) {
    if(mp) {
      this.paginator = mp;
      this.dataSource = new MatTableDataSource<any>(your_data);
      this.dataSource.paginator = this.paginator;
      this.cdRef.detectChanges();
     }
   }

and within my template file:

// incorporating the async pipe with my observable
  <div *ngIf="raceList$ | async as races">
    <div class="mat-table-width">
      <table mat-table [dataSource]="dataSource">
      ...
      </table>
      <mat-paginator [pageSizeOptions]="[10, 20, 30]"
                      showFirstLastButtons
                      aria-label="select page of races">
      </mat-paginator>
    </div>
  </div>

By implementing this approach, I successfully resolved the pagination issue and effectively displayed the table data.

What causes the unexpected behavior of MatPaginator within an ngIf statement?

Answer №1

Answer №2

Answer №3

Answer №4

Answer №5

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