ionic 2 caching images - caching

Question

I am writing an ionic 2 application, and want to cache images.
After long searching on the web I found these references:
https://gist.github.com/ozexpert/d95677e1fe044e6173ef59840c9c484e
https://github.com/chrisben/imgcache.js/blob/master/js/imgcache.js
I implemented the given solution, but i see that the ImgCache module does not behave as expected - the ImgCache.isCached callback is never called.
Any idea or other good solution for caching images in ionic 2?
======== UPDATE ==========
Here is the directive code I use:
import { Directive, ElementRef, Input } from '#angular/core';
import ImgCache from 'imgcache.js';
#Directive({
selector: '[image-cache]'
})
export class ImageCacheDirective {
constructor (
private el: ElementRef
) {
// init
}
ngOnInit() {
// This message is shown in console
console.log('ImageCacheDirective *** ngOnInit: ', this.el.nativeElement.src);
this.el.nativeElement.crossOrigin = "Anonymous"; // CORS enabling
ImgCache.isCached(this.el.nativeElement.src, (path: string, success: any) => {
// These message are never printed
console.log('path - '+ path);
console.log('success - '+ success);
if (success) {
// already cached
console.log('already cached so using cached');
ImgCache.useCachedFile(this.el.nativeElement);
} else {
// not there, need to cache the image
console.log('not there, need to cache the image - ' + this.el.nativeElement.src);
ImgCache.cacheFile(this.el.nativeElement.src, () => {
console.log('cached file');
// ImgCache.useCachedFile(el.nativeElement);
});
}
});
}
}
In app.nodule.es I do:
import { ImageCacheDirective } from '../components/image-cache-directive/image-cache-directive';
and then in home.html:
<img src="http://localhost/ionic-test/img/timeimg.php" image-cache>

Answer 1

It's late but probably this is the solution:
1. Install cordova FileTransfer:
ionic plugin add cordova-plugin-file-transfer --save
2. Init ImgCache when the deviceready event of cordova fires. In src/app/app.component.ts add these methods (or integrate them with your initializeApp() method - this method comes up with a default project start):
initImgCache() {
// activated debug mode
ImgCache.options.debug = true;
ImgCache.options.chromeQuota = 100 * 1024 * 1024; // 100 MB
ImgCache.init(() => { },
() => { console.log('ImgCache init: error! Check the log for errors'); });
}
initializeApp() {
this.platform.ready().then(() => {
this.initImgCache();
// Okay, so the platform is ready and our plugins are available.
// Here you can do any higher level native things you might need.
StatusBar.styleDefault();
Splashscreen.hide();
});
}

Answer 2

Another option is to use a dedicated cache manager for ionic. instead of implementing everything on your own.
Here are 2 options :
1. A generic cache implementation :https://github.com/Nodonisko/ionic-cache
2. This one is better for images: https://github.com/BenBBear/ionic-cache-src
EDIT:
This is not a "link only" answer.. it tells the user to use a ready made implementations instead of trying to implement from scratch.