Infinite scroll means that you don’t load all of the data on the front end at once; instead, you load a certain number of rows on page load and then load the next piece of data as the user scrolls.
Step1: Create a New Angular Application.
ng new demo
Step2: install Angular Material.
ng add @angular/material
Step3: Create New Component.
ng g c table
Step4: Write below code in your table.component.html
<div class="example-container mat-elevation-z8">
<mat-table #table [dataSource]="dataSource" (scroll)="onTableScroll($event)">
<ng-container matColumnDef="position">
<mat-header-cell *matHeaderCellDef> No. </mat-header-cell>
<mat-cell *matCellDef="let element"> {{element.position}} </mat-cell>
</ng-container>
<!-- Name Column -->
<ng-container matColumnDef="name">
<mat-header-cell *matHeaderCellDef> Name </mat-header-cell>
<mat-cell *matCellDef="let element"> {{element.name}} </mat-cell>
</ng-container>
<!-- Weight Column -->
<ng-container matColumnDef="weight">
<mat-header-cell *matHeaderCellDef> Weight </mat-header-cell>
<mat-cell *matCellDef="let element"> {{element.weight}} </mat-cell>
</ng-container>
<!-- Symbol Column -->
<ng-container matColumnDef="symbol">
<mat-header-cell *matHeaderCellDef> Symbol </mat-header-cell>
<mat-cell *matCellDef="let element"> {{element.symbol}} </mat-cell>
</ng-container>
<mat-header-row *matHeaderRowDef="displayedColumns"></mat-header-row>
<mat-row *matRowDef="let row; columns: displayedColumns;"></mat-row>
</mat-table>
</div>
Step5: write below code in your table.component.ts
import { Component, OnInit } from '@angular/core';
@Component({
selector: 'app-table',
templateUrl: './table.component.html',
styleUrls: ['./table.component.css']
})
export class TableComponent implements OnInit {
displayedColumns = ['position', 'name', 'weight', 'symbol'];
dataSource = ELEMENT_DATA;
start: number = 0;
limit: number = 15;
end: number = this.limit + this.start;
constructor() { }
ngOnInit(): void {
this.dataSource = this.getTableData(this.start, this.end);
this.updateIndex();
}
getTableData(start:any, end:any) {
return ELEMENT_DATA.filter((value, index) => index >= start && index < end)
}
updateIndex() {
this.start = this.end;
this.end = this.limit + this.start;
}
onTableScroll(e:any) {
const tableViewHeight = e.target.offsetHeight // viewport
const tableScrollHeight = e.target.scrollHeight // length of all table
const scrollLocation = e.target.scrollTop; // how far user scrolled
// If the user has scrolled within 200px of the bottom, add more data
const buffer = 200;
const limit = tableScrollHeight - tableViewHeight - buffer;
if (scrollLocation > limit) {
let data = this.getTableData(this.start, this.end);
this.dataSource = this.dataSource.concat(data);
this.updateIndex();
}
}
}
export interface Element {
name: string;
position: number;
weight: number;
symbol: string;
}
const ELEMENT_DATA: Element[] = [
{position: 1, name: 'Hydrogen', weight: 1.0079, symbol: 'H'},
{position: 2, name: 'Helium', weight: 4.0026, symbol: 'He'},
{position: 3, name: 'Lithium', weight: 6.941, symbol: 'Li'},
{position: 4, name: 'Beryllium', weight: 9.0122, symbol: 'Be'},
{position: 5, name: 'Boron', weight: 10.811, symbol: 'B'},
{position: 6, name: 'Carbon', weight: 12.0107, symbol: 'C'},
{position: 7, name: 'Nitrogen', weight: 14.0067, symbol: 'N'},
{position: 8, name: 'Oxygen', weight: 15.9994, symbol: 'O'},
{position: 9, name: 'Fluorine', weight: 18.9984, symbol: 'F'},
{position: 10, name: 'Neon', weight: 20.1797, symbol: 'Ne'},
{position: 11, name: 'Sodium', weight: 22.9897, symbol: 'Na'},
{position: 12, name: 'Magnesium', weight: 24.305, symbol: 'Mg'},
{position: 13, name: 'Aluminum', weight: 26.9815, symbol: 'Al'},
{position: 14, name: 'Silicon', weight: 28.0855, symbol: 'Si'},
{position: 15, name: 'Phosphorus', weight: 30.9738, symbol: 'P'},
{position: 16, name: 'Sulfur', weight: 32.065, symbol: 'S'},
{position: 17, name: 'Chlorine', weight: 35.453, symbol: 'Cl'},
{position: 18, name: 'Argon', weight: 39.948, symbol: 'Ar'},
{position: 19, name: 'Potassium', weight: 39.0983, symbol: 'K'},
{position: 20, name: 'Calcium', weight: 40.078, symbol: 'Ca'},
{position: 21, name: 'Hydrogen', weight: 1.0079, symbol: 'H'},
{position: 22, name: 'Helium', weight: 4.0026, symbol: 'He'},
{position: 23, name: 'Lithium', weight: 6.941, symbol: 'Li'},
{position: 24, name: 'Beryllium', weight: 9.0122, symbol: 'Be'},
{position: 25, name: 'Boron', weight: 10.811, symbol: 'B'},
{position: 26, name: 'Carbon', weight: 12.0107, symbol: 'C'},
{position: 27, name: 'Nitrogen', weight: 14.0067, symbol: 'N'},
{position: 28, name: 'Oxygen', weight: 15.9994, symbol: 'O'},
{position: 29, name: 'Fluorine', weight: 18.9984, symbol: 'F'},
{position: 30, name: 'Neon', weight: 20.1797, symbol: 'Ne'},
{position: 31, name: 'Sodium', weight: 22.9897, symbol: 'Na'},
{position: 32, name: 'Magnesium', weight: 24.305, symbol: 'Mg'},
{position: 33, name: 'Aluminum', weight: 26.9815, symbol: 'Al'},
{position: 34, name: 'Silicon', weight: 28.0855, symbol: 'Si'},
{position: 35, name: 'Phosphorus', weight: 30.9738, symbol: 'P'},
{position: 36, name: 'Sulfur', weight: 32.065, symbol: 'S'},
{position: 37, name: 'Chlorine', weight: 35.453, symbol: 'Cl'},
{position: 38, name: 'Argon', weight: 39.948, symbol: 'Ar'},
{position: 39, name: 'Potassium', weight: 39.0983, symbol: 'K'},
{position: 40, name: 'Calcium', weight: 40.078, symbol: 'Ca'},
{position: 41, name: 'Hydrogen', weight: 1.0079, symbol: 'H'},
{position: 42, name: 'Helium', weight: 4.0026, symbol: 'He'},
{position: 43, name: 'Lithium', weight: 6.941, symbol: 'Li'},
{position: 44, name: 'Beryllium', weight: 9.0122, symbol: 'Be'},
{position: 45, name: 'Boron', weight: 10.811, symbol: 'B'},
{position: 46, name: 'Carbon', weight: 12.0107, symbol: 'C'},
{position: 47, name: 'Nitrogen', weight: 14.0067, symbol: 'N'},
{position: 48, name: 'Oxygen', weight: 15.9994, symbol: 'O'},
{position: 49, name: 'Fluorine', weight: 18.9984, symbol: 'F'},
{position: 50, name: 'Neon', weight: 20.1797, symbol: 'Ne'},
{position: 51, name: 'Sodium', weight: 22.9897, symbol: 'Na'},
{position: 52, name: 'Magnesium', weight: 24.305, symbol: 'Mg'},
{position: 53, name: 'Aluminum', weight: 26.9815, symbol: 'Al'},
{position: 54, name: 'Silicon', weight: 28.0855, symbol: 'Si'},
{position: 55, name: 'Phosphorus', weight: 30.9738, symbol: 'P'},
{position: 56, name: 'Sulfur', weight: 32.065, symbol: 'S'},
{position: 57, name: 'Chlorine', weight: 35.453, symbol: 'Cl'},
{position: 58, name: 'Argon', weight: 39.948, symbol: 'Ar'},
{position: 59, name: 'Potassium', weight: 39.0983, symbol: 'K'},
{position: 60, name: 'Calcium', weight: 40.078, symbol: 'Ca'},
];
Step:6 write css in app.component.css
.example-container {
display: flex;
flex-direction: column;
max-height: 500px;
min-width: 300px;
}
.mat-table {
overflow: auto;
max-height: 500px;
}
add your component in app.component.html
<app-table></app-table>
Step7: run your application.
