59 lines
1.9 KiB
Markdown
59 lines
1.9 KiB
Markdown
# Angel3 Paginate
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[](https://dart.dev/null-safety)
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[](https://gitter.im/angel_dart/discussion)
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[](https://github.com/dart-backend/angel/tree/master/packages/paginate/LICENSE)
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Platform-agnostic pagination library, with custom support for the [Angel3](https://angel3-framework.web.app/).
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## Installation
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In your `pubspec.yaml` file:
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```yaml
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dependencies:
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angel3_paginate: ^6.0.0
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```
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## Usage
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This library exports a `Paginator<T>`, which can be used to efficiently produce instances of `PaginationResult<T>`. Pagination results, when serialized to JSON, look like this:
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```json
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{
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"total" : 75,
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"items_per_page" : 10,
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"previous_page" : 3,
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"current_page" : 4,
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"next_page" : 5,
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"start_index" : 30,
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"end_index" : 39,
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"data" : ["<items...>"]
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}
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```
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Results can be parsed from Maps using the `PaginationResult<T>.fromMap` constructor, and serialized via their `toJson()` method.
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To create a paginator:
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```dart
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import 'package:angel3_paginate/angel3_paginate.dart';
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void main() {
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var p = new Paginator(iterable);
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// Get the current page (default: page 1)
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var page = p.current;
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print(page.total);
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print(page.startIndex);
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print(page.data); // The actual items on this page.
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p.next(); // Advance a page
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p.back(); // Back one page
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p.goToPage(10); // Go to page number (1-based, not a 0-based index)
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}
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```
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The entire Paginator API is documented, so check out the DartDocs.
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Paginators by default cache paginations, to improve performance as you shift through pages. This can be especially helpful in a client-side application where your UX involves a fast response time, i.e. a search page.
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