[angular] Easy way to make a confirmation dialog in Angular?

Is there any not-so-complicated way to make a confirm dialog in angular 2, the idea is to click on an item and then show a popup or modal to confirm its deletion, I tried angular 2 modals from here angular2-modal, but I don't know how to make that if you confirm or cancel it does something. the click function works fine, the only problem is that I don't know too well how to use it. I also have another modal with the same plugin with the difference that I use.

this.modal.open(MyComponent);

And I don't want to create another component just for show a confirmation box that's why I'm asking.

This question is related to angular confirmation

The answer is


Here's a slghtly different take using javascript's native confirm functionality and a custom Angular directive. It's super flexible and pretty lightweight:

Usage:

<button (hrsAreYouSure) (then)="confirm(arg1)" (else)="cancel(arg2)">
  This will execute confirm if user presses Ok on the confirmation dialog, or cancel if they
  hit Cancel
</button>

Directive:

import {Directive, ElementRef, EventEmitter, Inject, OnInit, Output} from '@angular/core';

@Directive({
  selector: '[hrsAreYouSure]'
})

export class AreYouSureDirective implements OnInit {

  @Output() then = new EventEmitter<boolean>();
  @Output() else = new EventEmitter<boolean>();

  constructor(@Inject(ElementRef) private element: ElementRef) { }

  ngOnInit(): void {
    const directive = this;
    this.element.nativeElement.onclick = function() {
      const result = confirm('Are you sure?');
      if (result) {
        directive.then.emit(true);
      } else {
        directive.else.emit(true);
      }
    };
  }
}

UPDATE: Plunkr added

I was looking for a solution on all forums but found none, so found a solution with Old School Javascript Callback function. This is a really simple and clean way to create a confirmation dialog and set Callback functions for both YES and NO click events.
I have used Bootstrap CSS for Modal and An Alert Service with rxjs Subject.

alert.component.html

        <div *ngIf="message.type == 'confirm'"  class="modal-body">
            <div class="row">
                <div class="col-md-12">
                    <h3 class="text-center">{{message.text}}</h3>
                </div>
            </div>
            <div class="row">
                <div class="col-md-12">
                    <p class="text-center">
                        <a (click)="message.noFn()">
                            <button class="btn btn-pm">No</button>
                        </a>
                        <a (click)="message.siFn()">
                            <button  class="btn btn-sc" >Yes</button>
                        </a>
                    </p>
                </div>
            </div>
         </div>

alert.component.ts

export class AlertComponent {
    message: any;
    constructor(
      public router: Router, 
      private route: ActivatedRoute, 
      private alertService: AlertService,
   ) { }
   ngOnInit() {
    //this function waits for a message from alert service, it gets 
    //triggered when we call this from any other component
    this.alertService.getMessage().subscribe(message => {
        this.message = message;
    });
}

The most important part is here alert.service.ts

     import { Injectable } from '@angular/core'; 
     import { Router, NavigationStart } from '@angular/router'; 
     import { Observable } from 'rxjs'; 
     import { Subject } from 'rxjs/Subject';
     @Injectable() export class AlertService {
          private subject = new Subject<any>();
          constructor(){}
          confirm(message: string,siFn:()=>void,noFn:()=>void){
            this.setConfirmation(message,siFn,noFn);
          }
          setConfirmation(message: string,siFn:()=>void,noFn:()=>void) {
            let that = this;
            this.subject.next({ type: "confirm",
                        text: message,
                        siFn:
                        function(){
                            that.subject.next(); //this will close the modal
                            siFn();
                        },
                        noFn:function(){
                            that.subject.next();
                            noFn();
                        }
                     });

                 }

          getMessage(): Observable<any> {
             return this.subject.asObservable();
          }
       }

Call the function from any component

this.alertService.confirm("You sure Bro?",function(){
    //ACTION: Do this If user says YES
},function(){
    //ACTION: Do this if user says NO
})

Plunkr https://embed.plnkr.co/vWBT2nWmtsXff0MXMKdd/


Adding more options to the answer.

You could use npm i sweetalert2

Don't forget to add the style to your angular.json

"styles": [
         ...
          "node_modules/sweetalert2/src/sweetalert2.scss"
          ]

Then just import,

// ES6 Modules or TypeScript
import Swal from 'sweetalert2'


// CommonJS
const Swal = require('sweetalert2')

Boom, you are ready to go.

Swal.fire({
  title: 'Are you sure?',
  text: 'You will not be able to recover this imaginary file!',
  icon: 'warning',
  showCancelButton: true,
  confirmButtonText: 'Yes, delete it!',
  cancelButtonText: 'No, keep it'
}).then((result) => {
  if (result.value) {
    Swal.fire(
      'Deleted!',
      'Your imaginary file has been deleted.',
      'success'
    )
  // For more information about handling dismissals please visit
  // https://sweetalert2.github.io/#handling-dismissals
  } else if (result.dismiss === Swal.DismissReason.cancel) {
    Swal.fire(
      'Cancelled',
      'Your imaginary file is safe :)',
      'error'
    )
  }
})

More on this:- https://www.npmjs.com/package/sweetalert2

I do hope this helps someone.

Thanks.


In order to reuse a single confirmation dialog implementation in a multi-module application, the dialog must be implemented in a separate module. Here's one way of doing this with Material Design and FxFlex, though both of those can be trimmed back or replaced.

First the shared module (./app.module.ts):

import {NgModule} from '@angular/core';
import {CommonModule} from '@angular/common';
import {MatDialogModule, MatSelectModule} from '@angular/material';
import {ConfirmationDlgComponent} from './confirmation-dlg.component';
import {FlexLayoutModule} from '@angular/flex-layout';

@NgModule({
   imports: [
      CommonModule,
      FlexLayoutModule,
      MatDialogModule
   ],
   declarations: [
      ConfirmationDlgComponent
   ],
   exports: [
      ConfirmationDlgComponent
   ],
   entryComponents: [ConfirmationDlgComponent]
})

export class SharedModule {
}

And the dialog component (./confirmation-dlg.component.ts):

import {Component, Inject} from '@angular/core';
import {MAT_DIALOG_DATA} from '@angular/material';

@Component({
   selector: 'app-confirmation-dlg',
   template: `
      <div fxLayoutAlign="space-around" class="title colors" mat-dialog-title>{{data.title}}</div>
      <div class="msg" mat-dialog-content>
         {{data.msg}}
      </div>
      <a href="#"></a>
      <mat-dialog-actions fxLayoutAlign="space-around">
         <button mat-button [mat-dialog-close]="false" class="colors">No</button>
         <button mat-button [mat-dialog-close]="true" class="colors">Yes</button>
      </mat-dialog-actions>`,
   styles: [`
      .title {font-size: large;}
      .msg {font-size: medium;}
      .colors {color: white; background-color: #3f51b5;}
      button {flex-basis: 60px;}
   `]
})
export class ConfirmationDlgComponent {
   constructor(@Inject(MAT_DIALOG_DATA) public data: any) {}
}

Then we can use it in another module:

import {FlexLayoutModule} from '@angular/flex-layout';
import {NgModule} from '@angular/core';
import {GeneralComponent} from './general/general.component';
import {NgbModule} from '@ng-bootstrap/ng-bootstrap';
import {CommonModule} from '@angular/common';
import {MaterialModule} from '../../material.module';

@NgModule({
   declarations: [
      GeneralComponent
   ],
   imports: [
      FlexLayoutModule,
      MaterialModule,
      CommonModule,
      NgbModule.forRoot()
   ],
   providers: []
})
export class SystemAdminModule {}

The component's click handler uses the dialog:

import {Component} from '@angular/core';
import {ConfirmationDlgComponent} from '../../../shared/confirmation-dlg.component';
import {MatDialog} from '@angular/material';

@Component({
   selector: 'app-general',
   templateUrl: './general.component.html',
   styleUrls: ['./general.component.css']
})
export class GeneralComponent {

   constructor(private dialog: MatDialog) {}

   onWhateverClick() {
      const dlg = this.dialog.open(ConfirmationDlgComponent, {
         data: {title: 'Confirm Whatever', msg: 'Are you sure you want to whatever?'}
      });

      dlg.afterClosed().subscribe((whatever: boolean) => {
         if (whatever) {
            this.whatever();
         }
      });
   }

   whatever() {
      console.log('Do whatever');
   }
}

Just using the this.modal.open(MyComponent); as you did won't return you an object whose events you can subscribe to which is why you can't get it to do something. This code creates and opens a dialog whose events we can subscribe to.

If you trim back the css and html this is really a simple component, but writing it yourself gives you control over its design and layout whereas a pre-written component will need to be much more heavyweight to give you that control.


I'm pretty late to the party, but here is another implementation using : https://stackblitz.com/edit/angular-confirmation-dialog

confirmation-dialog.service.ts

import { Injectable } from '@angular/core';
import { Observable } from 'rxjs/Observable';

import { NgbModal } from '@ng-bootstrap/ng-bootstrap';

import { ConfirmationDialogComponent } from './confirmation-dialog.component';

@Injectable()
export class ConfirmationDialogService {

  constructor(private modalService: NgbModal) { }

  public confirm(
    title: string,
    message: string,
    btnOkText: string = 'OK',
    btnCancelText: string = 'Cancel',
    dialogSize: 'sm'|'lg' = 'sm'): Promise<boolean> {
    const modalRef = this.modalService.open(ConfirmationDialogComponent, { size: dialogSize });
    modalRef.componentInstance.title = title;
    modalRef.componentInstance.message = message;
    modalRef.componentInstance.btnOkText = btnOkText;
    modalRef.componentInstance.btnCancelText = btnCancelText;

    return modalRef.result;
  }

}

confirmation-dialog.component.ts

import { Component, Input, OnInit } from '@angular/core';
import { NgbActiveModal } from '@ng-bootstrap/ng-bootstrap';

@Component({
  selector: 'app-confirmation-dialog',
  templateUrl: './confirmation-dialog.component.html',
  styleUrls: ['./confirmation-dialog.component.scss'],
})
export class ConfirmationDialogComponent implements OnInit {

  @Input() title: string;
  @Input() message: string;
  @Input() btnOkText: string;
  @Input() btnCancelText: string;

  constructor(private activeModal: NgbActiveModal) { }

  ngOnInit() {
  }

  public decline() {
    this.activeModal.close(false);
  }

  public accept() {
    this.activeModal.close(true);
  }

  public dismiss() {
    this.activeModal.dismiss();
  }

}

confirmation-dialog.component.html

<div class="modal-header">
  <h4 class="modal-title">{{ title }}</h4>
    <button type="button" class="close" aria-label="Close" (click)="dismiss()">
      <span aria-hidden="true">&times;</span>
    </button>
  </div>
  <div class="modal-body">
    {{ message }}
  </div>
  <div class="modal-footer">
    <button type="button" class="btn btn-danger" (click)="decline()">{{ btnCancelText }}</button>
    <button type="button" class="btn btn-primary" (click)="accept()">{{ btnOkText }}</button>
  </div>

Use the dialog like this:

public openConfirmationDialog() {
    this.confirmationDialogService.confirm('Please confirm..', 'Do you really want to ... ?')
    .then((confirmed) => console.log('User confirmed:', confirmed))
    .catch(() => console.log('User dismissed the dialog (e.g., by using ESC, clicking the cross icon, or clicking outside the dialog)'));
  }

you can use window.confirm inside your function combined with if condition

 delete(whatever:any){
    if(window.confirm('Are sure you want to delete this item ?')){
    //put your delete method logic here
   }
}

when you call the delete method it will popup a confirmation message and when you press ok it will perform all the logic inside the if condition.


You could use sweetalert: https://sweetalert.js.org/guides/

npm install sweetalert --save

Then, simply import it into your application:

import swal from 'sweetalert';

If you pass two arguments, the first one will be the modal's title, and the second one its text.

swal("Here's the title!", "...and here's the text!");