Angular does not support the functionality of having multiple material paginations within a single component

Question

Angular does not support the functionality of having multiple material paginations within a single component

I am currently working on creating a component that contains two dataTables, each with a different dataSource. However, I am facing an issue where my Tables are not visible immediately after the component is loaded due to the *ngIf directive being used. Because of this, I cannot utilize ngAfterViewInit(). Instead, I found a solution on Github that was suggested by a user:

private paginator: MatPaginator;
private reportingPaginator: MatPaginator;
private sort: MatSort;
private reportingSort: MatSort;

@ViewChild(MatSort) set matSort(ms: MatSort) {
  this.sort = ms;
  this.reportingSort = ms;
  this.setDataSourceAttributes();
}

@ViewChild(MatPaginator) set matPaginator(mp: MatPaginator) {
  this.paginator = mp;
  this.reportingPaginator = mp;
  this.setDataSourceAttributes();
}

setDataSourceAttributes() {

    this.dataSource.paginator = this.paginator;
    this.dataSource.sort = this.sort;

    this.reportingDataSource.paginator = this.reportingPaginator;
    this.reportingDataSource.sort = this.reportingSort;

}

Despite implementing this solution, I am still encountering issues. The pagination does not work when both paginators are included in the @ViewChild(MatPaginator). However, if I include only one of the paginators:

@ViewChild(MatPaginator) set matPaginator(mp: MatPaginator) {
this.reportingPaginator = mp;
this.setDataSourceAttributes();
}

or

@ViewChild(MatPaginator) set matPaginator(mp: MatPaginator) {
this.paginator = mp;
this.setDataSourceAttributes();
}

the included paginator works correctly! What steps should I take to ensure that both paginators work as intended?

angular typescript angular-material angular-material2 angular-datatables

Answer 1

Answer №1

When dealing with multiple MatPaginator and MatSort components on a single page, it is important to use the following code snippet:

@ViewChildren(MatPaginator) paginator = new QueryList<MatPaginator>();
@ViewChildren(MatSort) sort = new QueryList<MatSort>();

This code will provide you with a list of MatSort and MatPaginator components in the order they appear on your page. Below is the complete implementation:

import { Component, OnInit, ViewChild, ViewChildren, AfterViewInit, QueryList } from '@angular/core';
import { MatTableDataSource, MatSort, MatPaginator } from '@angular/material';

export interface AssignmentElement {
  assignmentId: number;
  action: string;
  userName: string;
  roleName: string;
  enabled: string;
  createdOn: string;
  createdBy: string;
  modifiedOn: string;
  modifiedBy: string;
  status: string;
}

// Define ASSIGNMENT_ELEMENT_DATA

export interface RoleElement {
  roleId: number;
  action: string;
  roleName: string;
  roleDescription: string;
  createdOn: string;
  createdBy: string;
  modifiedOn: string;
  modifiedBy: string;
  status: string;
}

// Define ROLE_ELEMENT_DATA

@Component({
  selector: 'app-myqueue',
  templateUrl: './myqueue.component.html',
  styleUrls: ['./myqueue.component.css']
})
export class MyQueueComponent implements OnInit, AfterViewInit {

  dataSource1: MatTableDataSource<AssignmentElement>;
  dataSource2: MatTableDataSource<RoleElement>;
  @ViewChildren(MatPaginator) paginator = new QueryList<MatPaginator>();
  @ViewChildren(MatSort) sort = new QueryList<MatSort>();

  assignmentColumn: string[] = [
    // Columns for AssignmentElement
  ];
  roleColumn: string[] = [
    // Columns for RoleElement
  ];

  constructor() {
    this.dataSource1 = new MatTableDataSource<AssignmentElement>(ASSIGNMENT_ELEMENT_DATA);
    this.dataSource2 = new MatTableDataSource<RoleElement>(ROLE_ELEMENT_DATA);
  }

  ngOnInit() {
  }

  ngAfterViewInit() {
    this.dataSource1.paginator = this.paginator.toArray()[0];
    this.dataSource1.sort = this.sort.toArray()[0];
    this.dataSource2.paginator = this.paginator.toArray()[1];
    this.dataSource2.sort = this.sort.toArray()[1];
  }

}

Answer 2

When dealing with multiple MatPaginator and MatSort components on a single page, it is important to use the following code snippet:

@ViewChildren(MatPaginator) paginator = new QueryList<MatPaginator>();
@ViewChildren(MatSort) sort = new QueryList<MatSort>();

This code will provide you with a list of MatSort and MatPaginator components in the order they appear on your page. Below is the complete implementation:

import { Component, OnInit, ViewChild, ViewChildren, AfterViewInit, QueryList } from '@angular/core';
import { MatTableDataSource, MatSort, MatPaginator } from '@angular/material';

export interface AssignmentElement {
  assignmentId: number;
  action: string;
  userName: string;
  roleName: string;
  enabled: string;
  createdOn: string;
  createdBy: string;
  modifiedOn: string;
  modifiedBy: string;
  status: string;
}

// Define ASSIGNMENT_ELEMENT_DATA

export interface RoleElement {
  roleId: number;
  action: string;
  roleName: string;
  roleDescription: string;
  createdOn: string;
  createdBy: string;
  modifiedOn: string;
  modifiedBy: string;
  status: string;
}

// Define ROLE_ELEMENT_DATA

@Component({
  selector: 'app-myqueue',
  templateUrl: './myqueue.component.html',
  styleUrls: ['./myqueue.component.css']
})
export class MyQueueComponent implements OnInit, AfterViewInit {

  dataSource1: MatTableDataSource<AssignmentElement>;
  dataSource2: MatTableDataSource<RoleElement>;
  @ViewChildren(MatPaginator) paginator = new QueryList<MatPaginator>();
  @ViewChildren(MatSort) sort = new QueryList<MatSort>();

  assignmentColumn: string[] = [
    // Columns for AssignmentElement
  ];
  roleColumn: string[] = [
    // Columns for RoleElement
  ];

  constructor() {
    this.dataSource1 = new MatTableDataSource<AssignmentElement>(ASSIGNMENT_ELEMENT_DATA);
    this.dataSource2 = new MatTableDataSource<RoleElement>(ROLE_ELEMENT_DATA);
  }

  ngOnInit() {
  }

  ngAfterViewInit() {
    this.dataSource1.paginator = this.paginator.toArray()[0];
    this.dataSource1.sort = this.sort.toArray()[0];
    this.dataSource2.paginator = this.paginator.toArray()[1];
    this.dataSource2.sort = this.sort.toArray()[1];
  }

}

Answer 3

Answer №2

You can also retrieve them using #id:

In the HTML code:

<mat-paginator #categoryPaginator [pageSizeOptions]="[15]" hidePageSize="true" showFirstLastButtons="false"></mat-paginator>

In the component TypeScript file:

@ViewChild('categoryPaginator', { read: MatPaginator }) categoryPaginator: MatPaginator;

UPDATE

Upon further investigation after a comment from gh0st, it appears that the "read" option should be a boolean according to the Angular documentation for ViewChild. I experimented and found that { read: true } does not work, but { read: false } does. However, since false is the default value, omitting it altogether still functions correctly. Therefore, the most concise way to achieve this is:

@ViewChild('categoryPaginator') categoryPaginator: MatPaginator;

I have tested this with three tables/paginators in a single view component and they continue to function as expected.

I speculate that { read: MatPaginator } may actually be interpreted as { read: false }

The Angular documentation provides a basic example of this:

A template reference variable as a string (e.g., query <my-component #cmp></my-component> with @ViewChild('cmp'))

UPDATE-2

In a particular scenario where I had two Material Autocomplete components within one module and required access to the MatAutocomplete trigger for one of them, it seems that specifying { read: MatAutocompleteTrigger } is crucial. Otherwise, it will only return an ElementRef:

@ViewChild('localityAutoComplete', { read: MatAutocompleteTrigger }) trigger: MatAutocompleteTrigger;

Answer 4

You can also retrieve them using #id:

In the HTML code:

<mat-paginator #categoryPaginator [pageSizeOptions]="[15]" hidePageSize="true" showFirstLastButtons="false"></mat-paginator>

In the component TypeScript file:

@ViewChild('categoryPaginator', { read: MatPaginator }) categoryPaginator: MatPaginator;

UPDATE

Upon further investigation after a comment from gh0st, it appears that the "read" option should be a boolean according to the Angular documentation for ViewChild. I experimented and found that { read: true } does not work, but { read: false } does. However, since false is the default value, omitting it altogether still functions correctly. Therefore, the most concise way to achieve this is:

@ViewChild('categoryPaginator') categoryPaginator: MatPaginator;

I have tested this with three tables/paginators in a single view component and they continue to function as expected.

I speculate that { read: MatPaginator } may actually be interpreted as { read: false }

The Angular documentation provides a basic example of this:

A template reference variable as a string (e.g., query <my-component #cmp></my-component> with @ViewChild('cmp'))

UPDATE-2

In a particular scenario where I had two Material Autocomplete components within one module and required access to the MatAutocomplete trigger for one of them, it seems that specifying { read: MatAutocompleteTrigger } is crucial. Otherwise, it will only return an ElementRef:

@ViewChild('localityAutoComplete', { read: MatAutocompleteTrigger }) trigger: MatAutocompleteTrigger;

Answer 5

Answer №3

It's important to exercise caution when utilizing ViewChild alongside an ngIf directive that evaluates to false, as the ViewChild won't grab any values in this scenario.

Answer 6

It's important to exercise caution when utilizing ViewChild alongside an ngIf directive that evaluates to false, as the ViewChild won't grab any values in this scenario.

Angular does not support the functionality of having multiple material paginations within a single component

Answer №1

Answer №2

Answer №3

Similar questions

What is the best way to organize class usage within other classes to prevent circular dependencies?

Customizing Angular Material select fields with border radius

Angular displays incorrect HTTP error response status as 0 instead of the actual status code

Exploring the creation of an Angular service that utilizes HttpClient for making GET requests, with a focus on the different

Using TypeScript, add an observable to an array of observables using RxJS

Leveraging jQuery within a webpack module shared across multiple components, located outside the webpack root directory

What is a suitable alternative to forkJoin for executing parallel requests that can still complete even if one of them fails?

What is the best way to pass a dynamically generated component as the ng-content for another dynamically generated component?

Mocking a promise rejection in Jest to ensure that the calling function properly handles rejections

Creating a customized Angular Material 2 component that utilizes the NG Value Accessor feature

Creating a currency input field in HTML using a pattern textbox

What is the process for including an extra track in Twilio Video?

What is the best way to monitor and react to individual changes in a form array within an Angular application?

The toggle-button's group property does not function properly when paired with ngIf

When attempting to inject a provider from the same module, the dependencies cannot be resolved

Animating Angular on the table row element

Angular's FormGroup for reactive forms is a powerful feature that allows for

Is it feasible to bring in a Typescript file into an active ts-node REPL session?

Selecting the checkbox to populate the input field

Blob is unable to open the PDF file as it is not