javascript - Slick Carousel with Angular 2

Question

Hi I'm starting with Angular 2 and trying to make this carousel plugin to work: slick

After a while I managed to make it work like a Component like this:

import { Component, Input, ElementRef, AfterViewInit, AfterContentInit} from '@angular/core';
declare var jQuery: any;

@Component({
    selector: 'slick-slider',
    template: `
        <ng-content></ng-content>
    `
})
export class SlickSliderComponent implements AfterContentInit{
    @Input() options: any;

    $element: any;

    defaultOptions: any = {};

    constructor(private el: ElementRef) {
    }

    ngAfterContentInit() {
        for (var key in this.options) {
            this.defaultOptions[key] = this.options[key];
        }

        this.$element = jQuery(this.el.nativeElement).slick(this.defaultOptions);
    }
}

And I would use it like this on a template:

<slick-slider>
    <div><img class="btn btn-lg" src="/assets/img/img1.png" /></div>
    <div><img class="btn btn-lg" src="/assets/img/img2.png" /></div>
    <div><img class="btn btn-lg" src="/assets/img/img3.png" /></div>
    <div><img class="btn btn-lg" src="/assets/img/img4.png" /></div>
    <div><img class="btn btn-lg" src="/assets/img/img5.png" /></div>
</slick-slider>

This works fine. But when I try to use it inside *ngFor like this:

<slick-slider>
    <div *ngFor="let source of sources">
        <img class="btn btn-lg" (click)="watchSource(source)" src="/assets/img/{{source.name}}.png" />
    </div>
</slick-slider>

It stops working. I assume is because the init of the slider is done before the <div> elements are being rendered. Because I end up with this rendered html:

<slick-slider class="slick-initialized slick-slider">
    <div>
      <img ... >
    </div>
    <div>
      <img ... >
    </div>
    <div>
      <img ... >
    </div>
    <div>
      <img ... >
    </div>

    <div aria-live="polite" class="slick-list draggable">
      <div class="slick-track" role="listbox" style="opacity: 1; width: 0px; transform: translate3d(0px, 0px, 0px);">
        <!-- Divs should be rendered here with slick styles included -->
      </div>
  </div>
</slick-slider>

Any idea how to make this work? I tried using "ngAfterContentInit" and "ngAfterViewInit" neither seem to work.

This is the component using the SlickSliderComponent:

import { Component, OnInit } from '@angular/core'
import { DeviceSource } from './device-source'
import { RemoteService } from './remote.service';

@Component({
    selector: 'device-selector',
    moduleId: module.id,
    templateUrl: 'device-selector.component.html',
    providers: []
})



export class DeviceSelectorComponent implements OnInit {

    sources: [DeviceSource];

    ngOnInit(): void {
        this.getDeviceSources();
    }

    constructor(private remoteService: RemoteService){}

    getDeviceSources(): void {
        this.remoteService.getDeviceSources().then(sources => this.sources = sources);
    }
}

And here is the service used:

import { Injectable } from '@angular/core'
import { DeviceSource } from './device-source'

export const DEVICE_SOURCES:[DeviceSource]=
[
    {id: 1, dispayName: 'TV', name:'tv'},
    {id: 2, dispayName: 'Chrome', name:'chrome'},
    {id: 3, dispayName: 'Cable', name:'cable'},
    {id: 4, dispayName: 'XBox', name:'xbox'},
    {id: 4, dispayName: 'Pi', name:'pi'},

];


@Injectable()
export class RemoteService {
    getDeviceSources(): Promise<[DeviceSource]> {
        return Promise.resolve(DEVICE_SOURCES); 
    }
}

Answer 1

You should add *ngIf directive to your slick-slider so it is inserted into DOM after data source is populated, in this case it is variable sources:

<slick-slider *ngIf="sources">
    <div *ngFor="let source of sources">
        <img class="btn btn-lg" (click)="watchSource(source)" src="/assets/img/{{source.name}}.png" />
    </div>
</slick-slider>