Javascript – Angular 2 ng-bootstrap Modal: How to pass data to entry component

angularjavascriptng-bootstraptypescript

I'm trying to send data to a custom modal content component so I can call it from any other component and not repeat code. I'm new to Angular 2 and have followed the "Components as content" demo of ng-boostrap as well as the "Component Interaction" in the Angular docs and have not found a way to get this to work or an example for this case.

I can get the modal to open, but not with dynamic content. I've tried the @Input and the variable approach with no success. I've also added ModalService to the providers in app.module.ts. This is what I have with both approaches that doesn't work:

page.component.html:

<a (click)="modal('message')">
<template ngbModalContainer><my-modal [data]="data"></my-modal></template>

page.component.ts:

import { Component } from '@angular/core'
import { NgbModal } from '@ng-bootstrap/ng-bootstrap'
import { ModalService } from '../helpers/modal.service'
import { ModalComponent } from '../helpers/modal.component'

@Component({
  selector: 'app-page',
  templateUrl: './page.component.html',
  styleUrls: ['./page.component.scss'],
  entryComponents: [ ModalComponent ]
})

export class PageComponent {
  data = 'customData'
  constructor (
    private ngbModalService: NgbModal,
    private modalService: ModalService
   ) { }

  closeResult: string
  modal(content) {
    this.data = 'changedData'
    this.modalService.newModal(content)
    this.ngbModalService.open(ModalComponent).result.then((result) => {
      this.closeResult = `Closed with: ${result}`
    }, (reason) => {
      this.closeResult = `Dismissed ${reason}`
    });
  }
}

modal.service.ts:

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

@Injectable()
export class ModalService {
  private modalSource = new Subject<string>()
  modal$ = this.modalSource.asObservable()
  newModal(content: string) {
    this.modalSource.next(content)
  }
}

modal.component.ts:

import { Component, Input, OnDestroy } from '@angular/core';
import { Subscription }   from 'rxjs/Subscription';
import { ModalService } from './modal.service'

@Component({
  selector: 'my-modal',
  template: `
    <div class="modal-body">
    {{data}}
    {{content}}
    </div>
  `
})

export class ModalComponent implements OnDestroy {
  @Input() data: string
  content = 'hello'

  subscription: Subscription
  constructor(
    private modalService: ModalService
  ) {
    this.subscription = modalService.modal$.subscribe(
      content => {
        this.content = content
    });
  }

  ngOnDestroy() {
    this.subscription.unsubscribe();
  }
}

Using angular v2.1.0, angular-cli v1.0.0-beta.16, ng-bootstrap v1.0.0-alpha.8

Best Answer

I solved it! Here's how to do it:

  • In the component(from where you are opening the modal) do this: 

    const modalRef = this.modalService.open(ModalComponent);

modalRef.componentInstance.passedData= this.dataToPass;

modalRef.result.then(result => {
  //do something with result
}

  • In the modal component(receiving end): 

    export class ModalComponent { 

 passedData: typeOfData;     // declare it!

 someFunction() {     // or some  lifecycle hook 
  console.log(this.passedData)  // and then, use it!
 }

// rest of the ModalComponent 
}
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