Implement endless scrolling to JSON dataset in an ionic-3 application

Question

Implement endless scrolling to JSON dataset in an ionic-3 application

Is there a way to incorporate infinite scroll into my JSON array while initially displaying only 5 items?

data:[
0: Object { id: 123, title: "New family member Khjkjh has joined mymily", mm_family_id: 122, … }
1: Object { id: 124, title: "New family member Hey Dau has joined mymily", mm_family_id: 122, … }
2: Object { id: 125, title: "New family member Hey Dau has joined mymily", mm_family_id: 122, … }
3: Object { id: 126, title: "New family member New Dau has joined mymily", mm_family_id: 122, … }
4: Object { id: 127, title: "New family member New Dau has joined mymily", mm_family_id: 122, … }
5: Object { id: 128, title: "New family member New Dau has joined mymily", mm_family_id: 122, … }
6: Object { id: 129, title: "New family member New Dau has joined mymily", mm_family_id: 122, … }
7: Object { id: 130, title: "Abhishek Pandey has commented on post", mm_family_id: 122, … }
8: Object { id: 131, title: "Abhishek Pandey has commented on post", mm_family_id: 122, … }
]

Ionic info

@ionic/cli-utils  : 1.19.1
ionic (Ionic CLI) : 3.19.1

global packages:

cordova (Cordova CLI) : not installed

local packages:

@ionic/app-scripts : 3.1.8
Cordova Platforms  : android 7.0.0 browser 5.0.3
Ionic Framework    : ionic-angular 3.9.2

System:

Node : v8.7.0
npm  : 5.6.0
OS   : Windows 10

angular typescript ionic-framework ionic2 ionic3

Answer 1

Answer №1

If you want to implement Ionic infinite scroll with your array data, you can utilize the slice pipe in conjunction with ngFor. (Thanks to this resource)

<ion-list>
  <ion-item *ngFor="let i of items | slice:0:slice">
    insert your code here
  </ion-item>
</ion-list>

<ion-infinite-scroll threshold="100px" (ionInfinite)="doInfinite($event)">
  <ion-infinite-scroll-content loadingSpinner="bubbles" loadingText="Loading more data...">
  </ion-infinite-scroll-content>
</ion-infinite-scroll>

In your .ts file:

slice: number = 5;
doInfinite(infiniteScroll) {
 setTimeout(() => {
  this.slice += 5;
  infiniteScroll.complete();
 }, 300);
}

Initially, the first iteration will display the first 5 items (slice = 5). Upon calling doInfinite, the slice value increments by 5, resulting in showing 10 items.

Hopefully, this explanation proves beneficial for your implementation!

Answer 2

If you want to implement Ionic infinite scroll with your array data, you can utilize the slice pipe in conjunction with ngFor. (Thanks to this resource)

<ion-list>
  <ion-item *ngFor="let i of items | slice:0:slice">
    insert your code here
  </ion-item>
</ion-list>

<ion-infinite-scroll threshold="100px" (ionInfinite)="doInfinite($event)">
  <ion-infinite-scroll-content loadingSpinner="bubbles" loadingText="Loading more data...">
  </ion-infinite-scroll-content>
</ion-infinite-scroll>

In your .ts file:

slice: number = 5;
doInfinite(infiniteScroll) {
 setTimeout(() => {
  this.slice += 5;
  infiniteScroll.complete();
 }, 300);
}

Initially, the first iteration will display the first 5 items (slice = 5). Upon calling doInfinite, the slice value increments by 5, resulting in showing 10 items.

Hopefully, this explanation proves beneficial for your implementation!

Answer 3

Answer №2

To incorporate the infinite scroll functionality of Ionic, you can initialize your items array inside the constructor with the desired number of items to display initially. For instance, if you want to start with 5 items, you can achieve this by:

Here is an example of how you can set it up in your HTML:

<ion-content>
 <ion-list>
   <ion-item *ngFor="let i of items">{{i}}</ion-item>
 </ion-list>

 <ion-infinite-scroll (ionInfinite)="doInfinite($event)">
   <ion-infinite-scroll-content></ion-infinite-scroll-content>
 </ion-infinite-scroll>
</ion-content>

In your TypeScript file:

items = [];
count: number = 0;

constructor() {
  for (let i = 0; i < 5; i++) {  
    this.items.push(data[this.count]);   
    this.count++ 
  }
}

doInfinite(infiniteScroll) {
  setTimeout(() => {
    for (let i = 0; i < 5; i++) {   
      this.items.push(data[this.count]); 
      this.count++
    }

    infiniteScroll.complete();
  }, 500);
}

Answer 4

To incorporate the infinite scroll functionality of Ionic, you can initialize your items array inside the constructor with the desired number of items to display initially. For instance, if you want to start with 5 items, you can achieve this by:

Here is an example of how you can set it up in your HTML:

<ion-content>
 <ion-list>
   <ion-item *ngFor="let i of items">{{i}}</ion-item>
 </ion-list>

 <ion-infinite-scroll (ionInfinite)="doInfinite($event)">
   <ion-infinite-scroll-content></ion-infinite-scroll-content>
 </ion-infinite-scroll>
</ion-content>

In your TypeScript file:

items = [];
count: number = 0;

constructor() {
  for (let i = 0; i < 5; i++) {  
    this.items.push(data[this.count]);   
    this.count++ 
  }
}

doInfinite(infiniteScroll) {
  setTimeout(() => {
    for (let i = 0; i < 5; i++) {   
      this.items.push(data[this.count]); 
      this.count++
    }

    infiniteScroll.complete();
  }, 500);
}

Implement endless scrolling to JSON dataset in an ionic-3 application

Answer №1

Answer №2

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