Delete dynamic row in table using angular 8

Delete dynamic row in table using angular 8

To delete a dynamic row in a table using Angular 8, you'll follow these steps:

  1. Set Up Your Angular Project: Ensure you have an Angular project set up and running.

  2. Create a Component with a Table: This component will display the table with dynamic rows and provide the functionality to delete rows.

  3. Implement Deletion Logic: Add functionality to remove a row when a delete button is clicked.

Example Implementation

Here's a step-by-step example:

1. Create a New Angular Component

First, generate a new Angular component if you haven't already:

ng generate component dynamic-table

2. Component Template (dynamic-table.component.html)

Create a table with a delete button in each row:

<!-- dynamic-table.component.html --> <div> <table border="1"> <thead> <tr> <th>ID</th> <th>Name</th> <th>Action</th> </tr> </thead> <tbody> <tr *ngFor="let item of items; let i = index"> <td>{{ item.id }}</td> <td>{{ item.name }}</td> <td><button (click)="deleteRow(i)">Delete</button></td> </tr> </tbody> </table> </div>

3. Component Class (dynamic-table.component.ts)

Add logic to handle the deletion of a row:

// dynamic-table.component.ts import { Component } from '@angular/core'; @Component({ selector: 'app-dynamic-table', templateUrl: './dynamic-table.component.html', styleUrls: ['./dynamic-table.component.css'] }) export class DynamicTableComponent { items = [ { id: 1, name: 'John Doe' }, { id: 2, name: 'Jane Smith' }, { id: 3, name: 'Alice Johnson' } ]; deleteRow(index: number): void { if (confirm('Are you sure you want to delete this item?')) { this.items.splice(index, 1); } } }

4. Add Styles (Optional) (dynamic-table.component.css)

You can add styles to your component for better visualization:

/* dynamic-table.component.css */ table { width: 100%; border-collapse: collapse; } th, td { padding: 8px; text-align: left; } th { background-color: #f2f2f2; } button { background-color: red; color: white; border: none; padding: 5px 10px; cursor: pointer; } button:hover { background-color: darkred; }

Explanation

  1. Template:

    • The *ngFor directive iterates over the items array, creating a row for each item.
    • The (click) event binds the deleteRow(i) method to the button click, passing the index of the row to be deleted.

  2. Component Class:

    • items is an array of objects representing the rows in the table.
    • deleteRow(index: number) removes the item at the specified index from the items array using the splice method.
    • confirm() is used to ask the user for confirmation before deleting the row.

  3. Styles:

    • Simple styling to improve the appearance of the table and buttons.

Additional Considerations

  • Backend Integration: If you are working with a backend server, you would typically send an HTTP request to delete the item from the server as well. You can use Angular's HttpClient for this purpose.
  • Confirmation Dialog: For a more sophisticated confirmation dialog, you can use Angular Material's dialog component.

This example should help you get started with deleting rows from a table dynamically in Angular 8.

Examples

  1. How to delete a dynamic row from a table in Angular 8 using an *ngFor loop

    Description: Use Angular's *ngFor directive to iterate over rows in a table and implement a delete function to remove the selected row.

    Code:

    <!-- app.component.html --> <table> <tr *ngFor="let row of rows; let i = index"> <td>{{ row.name }}</td> <td><button (click)="deleteRow(i)">Delete</button></td> </tr> </table> 
    // app.component.ts import { Component } from '@angular/core'; @Component({ selector: 'app-root', templateUrl: './app.component.html', styleUrls: ['./app.component.css'] }) export class AppComponent { rows = [ { name: 'Row 1' }, { name: 'Row 2' }, { name: 'Row 3' } ]; deleteRow(index: number) { this.rows.splice(index, 1); } }

  2. How to use Angular 8 form with dynamic rows and delete functionality

    Description: Create a dynamic form with rows that can be added or removed using Angular's reactive forms.

    Code:

    <!-- app.component.html --> <form [formGroup]="form"> <div formArrayName="rows"> <div *ngFor="let row of rows.controls; let i = index" [formGroupName]="i"> <input formControlName="name" placeholder="Enter name"> <button type="button" (click)="removeRow(i)">Remove</button> </div> </div> <button type="button" (click)="addRow()">Add Row</button> </form> 
    // app.component.ts import { Component } from '@angular/core'; import { FormBuilder, FormGroup, FormArray } from '@angular/forms'; @Component({ selector: 'app-root', templateUrl: './app.component.html', styleUrls: ['./app.component.css'] }) export class AppComponent { form: FormGroup; constructor(private fb: FormBuilder) { this.form = this.fb.group({ rows: this.fb.array([this.createRow()]) }); } get rows() { return this.form.get('rows') as FormArray; } createRow(): FormGroup { return this.fb.group({ name: [''] }); } addRow() { this.rows.push(this.createRow()); } removeRow(index: number) { this.rows.removeAt(index); } }

  3. How to handle dynamic row deletion in Angular 8 with a confirmation dialog

    Description: Implement a confirmation dialog before deleting a row from a dynamic table.

    Code:

    <!-- app.component.html --> <table> <tr *ngFor="let row of rows; let i = index"> <td>{{ row.name }}</td> <td><button (click)="confirmDelete(i)">Delete</button></td> </tr> </table> 
    // app.component.ts import { Component } from '@angular/core'; import { MatDialog } from '@angular/material/dialog'; import { ConfirmDialogComponent } from './confirm-dialog/confirm-dialog.component'; @Component({ selector: 'app-root', templateUrl: './app.component.html', styleUrls: ['./app.component.css'] }) export class AppComponent { rows = [ { name: 'Row 1' }, { name: 'Row 2' }, { name: 'Row 3' } ]; constructor(public dialog: MatDialog) {} confirmDelete(index: number) { const dialogRef = this.dialog.open(ConfirmDialogComponent); dialogRef.afterClosed().subscribe(result => { if (result) { this.deleteRow(index); } }); } deleteRow(index: number) { this.rows.splice(index, 1); } } 
    // confirm-dialog.component.ts import { Component } from '@angular/core'; import { MatDialogRef } from '@angular/material/dialog'; @Component({ selector: 'app-confirm-dialog', template: ` <h1 mat-dialog-title>Confirm Delete</h1> <div mat-dialog-content>Are you sure you want to delete this row?</div> <div mat-dialog-actions> <button mat-button (click)="onNoClick()">Cancel</button> <button mat-button (click)="onYesClick()">Yes</button> </div> ` }) export class ConfirmDialogComponent { constructor(public dialogRef: MatDialogRef<ConfirmDialogComponent>) {} onNoClick(): void { this.dialogRef.close(); } onYesClick(): void { this.dialogRef.close(true); } }

  4. How to delete a row from a table in Angular 8 and update the UI

    Description: Demonstrate how to delete a row and ensure the UI reflects the changes immediately.

    Code:

    <!-- app.component.html --> <table> <tr *ngFor="let row of rows; let i = index"> <td>{{ row.name }}</td> <td><button (click)="deleteRow(i)">Delete</button></td> </tr> </table> 
    // app.component.ts import { Component } from '@angular/core'; @Component({ selector: 'app-root', templateUrl: './app.component.html', styleUrls: ['./app.component.css'] }) export class AppComponent { rows = [ { name: 'Row 1' }, { name: 'Row 2' }, { name: 'Row 3' } ]; deleteRow(index: number) { this.rows = this.rows.filter((_, i) => i !== index); } }

  5. How to dynamically delete rows with a service call in Angular 8

    Description: Integrate with a service to delete rows from a remote server and update the local table.

    Code:

    <!-- app.component.html --> <table> <tr *ngFor="let row of rows; let i = index"> <td>{{ row.name }}</td> <td><button (click)="deleteRow(i)">Delete</button></td> </tr> </table> 
    // app.component.ts import { Component, OnInit } from '@angular/core'; import { MyService } from './my.service'; @Component({ selector: 'app-root', templateUrl: './app.component.html', styleUrls: ['./app.component.css'] }) export class AppComponent implements OnInit { rows = [ { name: 'Row 1' }, { name: 'Row 2' }, { name: 'Row 3' } ]; constructor(private myService: MyService) {} ngOnInit() { // Fetch initial data if needed } deleteRow(index: number) { this.myService.deleteRow(this.rows[index].id).subscribe(() => { this.rows.splice(index, 1); }); } } 
    // my.service.ts import { Injectable } from '@angular/core'; import { HttpClient } from '@angular/common/http'; import { Observable } from 'rxjs'; @Injectable({ providedIn: 'root' }) export class MyService { private apiUrl = 'https://api.example.com/rows'; constructor(private http: HttpClient) {} deleteRow(id: number): Observable<void> { return this.http.delete<void>(`${this.apiUrl}/${id}`); } }

  6. How to delete a row from a table in Angular 8 with dynamic row IDs

    Description: Handle dynamic row IDs when deleting rows from a table.

    Code:

    <!-- app.component.html --> <table> <tr *ngFor="let row of rows"> <td>{{ row.name }}</td> <td><button (click)="deleteRow(row.id)">Delete</button></td> </tr> </table> 
    // app.component.ts import { Component } from '@angular/core'; @Component({ selector: 'app-root', templateUrl: './app.component.html', styleUrls: ['./app.component.css'] }) export class AppComponent { rows = [ { id: 1, name: 'Row 1' }, { id: 2, name: 'Row 2' }, { id: 3, name: 'Row 3' } ]; deleteRow(id: number) { this.rows = this.rows.filter(row => row.id !== id); } }

  7. How to delete rows from a table in Angular 8 with animation

    Description: Add animations when removing rows from the table.

    Code:

    <!-- app.component.html --> <table> <tr *ngFor="let row of rows; let i = index" [@fadeInOut]> <td>{{ row.name }}</td> <td><button (click)="deleteRow(i)">Delete</button></td> </tr> </table> 
    // app.component.ts import { Component } from '@angular/core'; import { trigger, transition, style, animate } from '@angular/animations'; @Component({ selector: 'app-root', templateUrl: './app.component.html', styleUrls: ['./app.component.css'], animations: [ trigger('fadeInOut', [ transition(':enter', [ style({ opacity: 0 }), animate('300ms', style({ opacity: 1 })) ]), transition(':leave', [ animate('300ms', style({ opacity: 0 })) ]) ]) ] }) export class AppComponent { rows = [ { name: 'Row 1' }, { name: 'Row 2' }, { name: 'Row 3' } ]; deleteRow(index: number) { this.rows.splice(index, 1); } }

  8. How to delete a row and confirm using Angular 8 with a modal

    Description: Use a modal dialog to confirm deletion of a row from a dynamic table.

    Code:

    <!-- app.component.html --> <table> <tr *ngFor="let row of rows; let i = index"> <td>{{ row.name }}</td> <td><button (click)="openModal(i)">Delete</button></td> </tr> </table> <!-- Confirmation Modal --> <ng-template #confirmationModal> <div class="modal"> <p>Are you sure you want to delete this row?</p> <button (click)="confirmDelete()">Yes</button> <button (click)="cancelDelete()">No</button> </div> </ng-template> 
    // app.component.ts import { Component, TemplateRef, ViewChild } from '@angular/core'; import { NgbModal } from '@ng-bootstrap/ng-bootstrap'; @Component({ selector: 'app-root', templateUrl: './app.component.html', styleUrls: ['./app.component.css'] }) export class AppComponent { rows = [ { name: 'Row 1' }, { name: 'Row 2' }, { name: 'Row 3' } ]; rowIndexToDelete: number | null = null; @ViewChild('confirmationModal') confirmationModal!: TemplateRef<any>; constructor(private modalService: NgbModal) {} openModal(index: number) { this.rowIndexToDelete = index; this.modalService.open(this.confirmationModal); } confirmDelete() { if (this.rowIndexToDelete !== null) { this.rows.splice(this.rowIndexToDelete, 1); this.rowIndexToDelete = null; } this.modalService.dismissAll(); } cancelDelete() { this.rowIndexToDelete = null; this.modalService.dismissAll(); } }

  9. How to delete multiple rows at once in Angular 8

    Description: Implement functionality to select and delete multiple rows from a dynamic table.

    Code:

    <!-- app.component.html --> <table> <tr *ngFor="let row of rows; let i = index"> <td><input type="checkbox" [(ngModel)]="row.selected"></td> <td>{{ row.name }}</td> </tr> </table> <button (click)="deleteSelectedRows()">Delete Selected</button> 
    // app.component.ts import { Component } from '@angular/core'; @Component({ selector: 'app-root', templateUrl: './app.component.html', styleUrls: ['./app.component.css'] }) export class AppComponent { rows = [ { name: 'Row 1', selected: false }, { name: 'Row 2', selected: false }, { name: 'Row 3', selected: false } ]; deleteSelectedRows() { this.rows = this.rows.filter(row => !row.selected); } }

  10. How to delete a row in Angular 8 with an API call and handle errors

    Description: Implement deletion of a row with error handling during the API call.

    Code:

    <!-- app.component.html --> <table> <tr *ngFor="let row of rows; let i = index"> <td>{{ row.name }}</td> <td><button (click)="deleteRow(row.id)">Delete</button></td> </tr> </table> 
    // app.component.ts import { Component } from '@angular/core'; import { MyService } from './my.service'; @Component({ selector: 'app-root', templateUrl: './app.component.html', styleUrls: ['./app.component.css'] }) export class AppComponent { rows = [ { id: 1, name: 'Row 1' }, { id: 2, name: 'Row 2' }, { id: 3, name: 'Row 3' } ]; constructor(private myService: MyService) {} deleteRow(id: number) { this.myService.deleteRow(id).subscribe( () => { this.rows = this.rows.filter(row => row.id !== id); }, error => { console.error('Error deleting row:', error); } ); } } 
    // my.service.ts import { Injectable } from '@angular/core'; import { HttpClient } from '@angular/common/http'; import { Observable } from 'rxjs'; @Injectable({ providedIn: 'root' }) export class MyService { private apiUrl = 'https://api.example.com/rows'; constructor(private http: HttpClient) {} deleteRow(id: number): Observable<void> { return this.http.delete<void>(`${this.apiUrl}/${id}`); } }

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