InfiniteScroll
The Infinite Scroll allows you to perform an action when the user scrolls a specified distance from the bottom of the page.
The expression assigned to the infinite
event is called when
the user scrolls to the specified distance. When this expression
has finished its tasks, it should call the complete()
method
on the infinite scroll instance.
Directive
selector: ion-infinite-scroll
Usage
<ion-content>
<ion-list>
<ion-item *ngFor="#i of items"></ion-item>
</ion-list>
<ion-infinite-scroll (infinite)="doInfinite($event)">
<ion-infinite-scroll-content></ion-infinite-scroll-content>
</ion-infinite-scroll>
</ion-content>
@Page({...})
export class NewsFeedPage {
constructor() {
this.items = [];
for (var i = 0; i < 30; i++) {
this.items.push( this.items.length );
}
}
doInfinite(infiniteScroll) {
console.log('Begin async operation');
setTimeout(() => {
for (var i = 0; i < 30; i++) {
this.items.push( this.items.length );
}
console.log('Async operation has ended');
infiniteScroll.complete();
}, 500);
}
}
Infinite Scroll Content
By default, Ionic uses the infinite scroll spinner that looks
best for the platform the user is on. However, you can change the
default spinner or add text by adding properties to the
ion-infinite-scroll-content
component.
<ion-content>
<ion-infinite-scroll (infinite)="doInfinite($event)">
<ion-infinite-scroll-content
loadingSpinner="bubbles"
loadingText="Loading more data...">
</ion-infinite-scroll-content>
</ion-infinite-scroll>
</ion-content>
Further Customizing Infinite Scroll Content
The ion-infinite-scroll
component holds the infinite scroll logic.
It requires a child component in order to display the content.
Ionic uses ion-infinite-scroll-content
by default. This component
displays the infinite scroll and changes the look depending
on the infinite scroll's state. Separating these components allows
developers to create their own infinite scroll content components.
You could replace our default content with custom SVG or CSS animations.
Instance Members
state
complete()
Call complete()
within the infinite
output event handler when
your async operation has completed. For example, the loading
state is while the app is performing an asynchronous operation,
such as receiving more data from an AJAX request to add more items
to a data list. Once the data has been received and UI updated, you
then call this method to signify that the loading has completed.
This method will change the infinite scroll’s state from loading
to enabled
.
enable(shouldEnable)
Call enable(false)
to disable the infinite scroll from actively
trying to receive new data while scrolling. This method is useful
when it is known that there is no more data that can be added, and
the infinite scroll is no longer needed.
Param | Type | Details |
---|---|---|
shouldEnable |
boolean
|
If the infinite scroll should be
enabled or not. Setting to |
Input Properties
Attr | Type | Details |
---|---|---|
threshold | string |
The threshold distance from the bottom
of the content to call the |
Output Events
Attr | Details |
---|---|
infinite | The expression to call when the scroll reaches
the threshold distance. From within your infinite handler,
you must call the infinite scroll's |