Cursored Page Pattern

The Cursored Page pattern adds cursor-management affordances to the Page pattern, giving clients control over the pagination of the list’s elements.

The Paged resource contains cursor-style links to the previous and next pages. Clients can change the cursor configuration with the Cursor resource.

Changing Cursor Configuration

The client changes cursor configuration by POSTing a new configuration form to the Cursor resource. Cursor returns the newly-configured Paged resource URL in its Location response header.

If the Paged resource follows the List pattern, then the Cursor Entry resource will contain a cursor field to change the cursor configuration with. However, if the Paged resource presents a data-oriented list of elements, those data elements may contain a cursor field that can be used to change the cursor pagination start or end point with the Cursor resource.

If instead of utilizing the List pattern, the Paged resource is a list of data, then the individual elements must have a cursor property that can be used in the Cursor form to change the paged cursor position.

See the Cursor resource reference for more details on how to change the page size and cursor position.

Paged Resource

Profile: <https://level3.rest/patterns/page#paged-resource>

See the documentation for Paged resource.

cursor

rel="https://level3.rest/patterns/page/cursor#cursor"

Points to a Cursor resource that can configure the cursor pagination.

list-entry

rel="https://level3.rest/patterns/list#list-entry"

Points to individual Cursor Entry resources in the List. This relationship is required for paged List resources using the Cursored Page pattern. See the List Entry description for more details about this resource profile.

Cursor Entry Resource

Profile: <https://level3.rest/patterns/page/cursor#cursor-entry-resource>,
         <https://level3.rest/patterns/list#entry-resource>

In a List resource, the cursor entries are individual List Entry resources that contain a field with the entry’s cursor value. This value is used to change the pagination point via the Cursor resource. Lists that use the Cursored Page resource must provide Cursor Entry resources with the cursor property.

Property	Purpose
`cursor`	The Entry’s cursor value. Useful for changing the pagination configuration. It contains the same information as the Cursor resource.

Cursor Resource

Profile: <https://level3.rest/patterns/page/cursor#cursor-resource>

The Cursor resource is a form to change the cursor pagination configuration. It is a Lookup resource containing the current configuration. The client can specify a limit on the number of elements per page and either the before or after cursor to select a different page point to navigate through. Once the client submits the lookup, the redirects to the Paged resource configured with this configuration.

Property	Purpose
`limit`	The number of elements to consume from the cursor per page. If not present in the form, the current page limit configuration will be used.
`before`	The cursor value to view preceding elements from. The element at this cursor will not be presented. The Paged resource’s `next` and `previous` links will navigate in the same order so that the client will follow the `previous` link to navigate backwards through the list.
`after`	The cursor value to view proceeding element from. The element at this cursor will not be presented.

If the client only wants to change the page limit, but keep the same cursor position, then they only need to post the limit field in the form. If they wish to change the position of the cursor, they supply either the before or after field in the form. This cursor value comes from either the Cursor Entry resource or the cursor property of an element in a resource’s list data.

paginates

rel="https://level3.rest/patterns/page/cursor#paginates"

Points to the Paged resource that this Cursor resource configures.

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