2017-05-25 18:34:48 +00:00
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# paginate
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2017-05-26 13:21:47 +00:00
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[](https://pub.dartlang.org/packages/angel_paginate)
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[](https://travis-ci.org/angel-dart/paginate)
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2017-05-26 13:36:17 +00:00
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2017-05-26 13:21:47 +00:00
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Platform-agnostic pagination library, with custom support for the
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[Angel framework](https://github.com/angel-dart/angel).
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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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angel_paginate: ^1.0.0
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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
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instances of `PaginationResult<T>`. Pagination results, when serialized to JSON, look like
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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
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serialized via their `toJson()` method.
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To create a paginator:
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```dart
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import 'package:angel_paginate/angel_paginate.dart';
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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.
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This can be especially helpful in a client-side application where your UX involves a fast
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response time, i.e. a search page.
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## Use With Angel
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Naturally, a library named `angel_paginate` has special provisions for the
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[Angel framework](https://github.com/angel-dart/angel).
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In `package:angel_paginate/server.dart`, a function called `paginate` generates
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pagination service hooks for you. If the result of a hooked service event is an `Iterable`,
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it will be paginated. This is convenient because it works with any data store, whether it
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be MongoDB, RethinkDB, an in-memory store, or something else entirely.
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```dart
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configureServer(Angel app) {
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var service = app.service('api/foo') as HookedService;
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service.afterIndexed.listen(paginate(itemsPerPage: 10));
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}
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```
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See `test/server_test.dart` for examples of usage with Angel.
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