MatSort is undefined - Angular 5

Question

I'm trying to implement a Material table in my angular application. Pagination and Filter are working fine, but i'm not able to sort my table. My reference to MatSort is undefined.

I did import it in AppModule:

import {MatTableModule} from '@angular/material/table';
import {MatTooltipModule} from '@angular/material/tooltip';
import {MatButtonModule, MatCheckboxModule,MatPaginatorModule,MatInputModule} from '@angular/material';
import {MatSortModule} from '@angular/material/sort';

...
@NgModule({
  declarations: [...],
  imports: [   
     MatSortModule,
     MatTableModule,
     MatPaginatorModule,
     MatInputModule,
     ...
   ]
  })

Here is my component.ts:

import { Component, OnInit , ViewChild, AfterViewInit} from '@angular/core';
...
import {MatTableDataSource,MatSort,MatPaginator} from '@angular/material';
...
export class MyClass inplements OnInit, AfterViewInit{
  @ViewChild(MatSort) sort:MatSort;
  @ViewChild(MatPaginator) paginator:MatPaginator;
  ...
  ngAfterViewInit(){
     this.dataSource = new MatTableDataSource(this.fake_data);
     this.dataSource.paginator = this.paginator
     this.dataSource.sort = this.sort
  }
 ...
}

And here is my component HTML:

<mat-form-field *ngIf="ready" class="width-80">
   <input matInput (keyup)="applyFilter($event.target.value)" placeholder="Filter">
</mat-form-field>
<mat-table #table class = "mat-elevation-z8 animate" matSort [dataSource]="dataSource" display:flex>
   <ng-container matColumnDef="fake_name">
       <mat-header-cell *matHeaderCellDef mat-sort-header class="columnTitle"><b>{{fake_label.name}}</b></mat-header-cell>
       <mat-cell *matCellDef="let fake;" class="cellContent">{{fake.name}}</mat-cell>
   </ng-container>
   <mat-header-row *matHeaderRowDef="fakeColumns"></mat-header-row>
   <mat-row *matRowDef="let row; columns: fakeColumns" class="animate"></mat-row>
</mat-table>
<mat-paginator [length]="length" [pageSize]="5" [pageSizeOptions]="[5,10,15,20,25,50,100]" showFirstLastButtons></mat-paginator>

Does anyone know what I'm doing wrong?

instead of declaring this.dataSource.sort = this.sort; in ngAfterViewInit() try to call it in ngOnInit() — yer, Jun 06 '18 at 13:54
I did, it keeps undefined, i tryied ngOnInit, ngAfterViewInit and an external function. none of them worked — Lucas Gaspar, Jun 06 '18 at 13:56

score 13 · Answer 1 · edited Mar 04 '20 at 11:05

13

Issue can be fixed adding in apps.module.ts:

import { MatPaginatorModule,MatSortModule } from '@angular/material';

and:

imports: [
    ....
    MatPaginatorModule,        
    MatSortModule

Hope this helps.

edited Mar 04 '20 at 11:05

Siva Karuppiah

947
8
16

answered Sep 13 '18 at 11:19

Philippe Corrèges

542
1
9
24

score 6 · Answer 2 · answered Jun 15 '19 at 03:17

I had the same problem and I've found an answer on a Angular's issue.

In my particular case (and that guy's case on github), it was solved removing the *ngIf on the mat-table tag. I'm not sure but maybe that <mat-form-field *ngIf="ready" class="width-80"> is causing some trouble.

score 4 · Answer 3 · answered Jan 21 '20 at 10:24

With Angular 8 and Material 6.4.1 if you waiting to receive a data from a service the simplest and best way to fix it just set the static: false instead of true, like this:

@ViewChild(MatSort, { static: false }) sort: MatSort;

In my case is an ngOnChanges call for data.

FYI: same for MatPaginator.

score 1 · Answer 4 · edited Jun 15 '20 at 22:43

The issue is because of *ngIf="ready". If we are setting this to ready from parent component, then place datasource.sort on ngOnChanges as this is the first life-cycle hook that gets called:

ngOnChanges(){ this.datasource.sort = sort; this.datasource.paginator = paginator; }

Alternatively, if you are changing ready in same component, place datasource.sort before you are setting ready false:

ngOnInit(){ this.datasource.sort = sort; this.datasource.paginator = paginator; this.ready=false; }

And, finally, initialize your datasource with some default value so this.datasource will not be null or undefined.

datasource=new MatTableDataSource([]);

score 0 · Answer 5 · answered Oct 18 '19 at 19:37

0

My solution was: mat-sort-header="FIELDNAME", as my columns contain "transformed" data.

answered Oct 18 '19 at 19:37

bvamos

759
6
9

score 0 · Answer 6 · answered Feb 06 '22 at 12:15

For me, I was using two MatTables and for the second one, I was doing pagination and sorting. By mistake I wrote matSort for the first table also. So, in component file, it was searching for sort and paginator of first table and I was defining it for second table.

MatSort is undefined - Angular 5

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