hasPreviousPage

hasPreviousPage is a boolean flag used in pagination systems to indicate whether there is a page before the current one. It is commonly included in responses to help clients render navigation controls and to signal whether a "previous" action is possible. In GraphQL Relay, for example, the PageInfo object exposes hasPreviousPage (and hasNextPage) along with startCursor and endCursor, which mark the range of items in the current page.

In offset-based pagination, hasPreviousPage is typically determined by the current offset or page number. If the offset is greater than zero, there is a previous page; similarly, if using page numbers, a current page number greater than one implies a previous page. In systems with a known total item count, hasPreviousPage can be derived from whether the current slice begins after the first item.

In cursor-based pagination, hasPreviousPage indicates whether there are more items before the current page when using forward or backward paging. It is often computed from the presence of a preceding page, or from the ability to fetch items using a startCursor with a backward navigation parameter.

Notes: hasPreviousPage is a convenience flag. Its accuracy depends on implementation details such as whether total counts are known and whether the dataset can change between requests. It is typically used together with hasNextPage and the cursor values.