I have implemented the rss2json service to fetch an rss feed without pagination support. Instead of a page parameter, I can utilize the count parameter in my request. With this setup, I am successfully able to retrieve and display the feed using a service built with ionic:
getRssFeed(rssUrl: string, count: number) {
return new Promise<any>(resolve => {
this.http.get(`${ environment.podcast.baseUrl }?rss_url=${ rssUrl }&api_key=${ environment.podcast.apiKey }&count=${ count }`)
.subscribe(data => {
resolve(data);
}, error => {
console.error('Encountered an issue while trying to fetch the rss feed.');
console.error(error);
});
});
}
The functionality works smoothly, allowing me to receive the data and integrate it into my application. I have also incorporated an infinite scroll component for handling pagination seamlessly. However, due to the absence of a page parameter in the rss2json service, updating the count results in receiving the entire array upon subsequent calls.
To address this issue, I need to implement a solution like the one below:
episodes: Array<any>;
count = 10;
...
this.episodes.splice(this.episodes.length, this.count, data.items);
In order to determine the current number of episodes loaded, I must follow these steps:
- Determine the current episode count (10, 20, 30, etc.)
- Initiate a request to fetch additional episodes
- Upon retrieval of 20 episodes from the service (starting at zero index), splice out the first 10 or 20 items and append the remaining to the existing list
However, I'm seeking guidance on how to achieve this efficiently. Your suggestions would be greatly appreciated.
Here is the process for requesting more episodes:
this.myPodcastService.getRssFeed(this.rssUrl, this.count)
.then(data => {
if (data) {
// console.log('data', data.items);
// data is an object
// data.items is an array of episodes
// this.episodes.splice(this.episodes.length, this.count, data.items);
} else {
...
}
...
});
For example, after loading the initial 10 episodes, I wish to load another set of 10. Therefore, I increment the count variable to 20 and pass it as the count parameter in the next request.
The response will contain 20 records. The goal is to discard the initial 10 entries, retaining only the latest 10 episodes.
Subsequent scrolls will require further increments of the count, such as to 30. This cycle continues as additional episodes are fetched and integrated into the list for seamless browsing experience.
Logging the progress should reflect something similar to:
this.episodes[10]
this.episodes[20]
this.episodes[30]
If anyone encounters a similar challenge, here is the solution I devised to manage the incremental loading effectively:
// load more episodes using infinite scroll.
loadMoreEpisodes(event) {
console.log('--> loading more episodes');
this.count = (this.count + this.count); // 10, 20, 30...
this.myPodcastService.getRssFeed(this.rssUrl, this.count)
.then(data => {
if (data) {
// append the new episodes to the existing array
this.episodes.push(...data.items.splice(-this.episodes.length, this.count));
event.target.complete();
console.log('this.episodes', this.episodes);
} else {
this.alertCtrl.create({
header: 'Error',
subHeader: 'Something bad happened',
message: 'An internet-related issue occurred preventing us from loading the playlist.',
buttons: [{ text: 'Ok', role: 'cancel' }]
}).then(alert => {
alert.present();
});
}
});
}