epic_explorer/server/utils/pagination.ts
2019-07-16 11:47:19 +05:30

48 lines
1.4 KiB
TypeScript

export function Paginate(
totalItems: number,
currentPage: number = 1,
pageSize: number = 10,
maxPages: number = 10,
) {
let totalPages = Math.ceil(totalItems / pageSize);
if (currentPage < 1) {
currentPage = 1;
} else if (currentPage > totalPages) {
currentPage = totalPages;
}
let startPage: number, endPage: number;
if (totalPages <= maxPages) {
startPage = 1;
endPage = totalPages;
} else {
let maxPagesBeforeCurrentPage = Math.floor(maxPages / 2);
let maxPagesAfterCurrentPage = Math.ceil(maxPages / 2) - 1;
if (currentPage <= maxPagesBeforeCurrentPage) {
startPage = 1;
endPage = maxPages;
} else if (currentPage + maxPagesAfterCurrentPage >= totalPages) {
startPage = totalPages - maxPages + 1;
endPage = totalPages;
} else {
startPage = currentPage - maxPagesBeforeCurrentPage;
endPage = currentPage + maxPagesAfterCurrentPage;
}
}
let startIndex = (currentPage - 1) * pageSize;
let endIndex = Math.min(startIndex + pageSize - 1, totalItems - 1);
let pages = Array.from(Array(endPage + 1 - startPage).keys()).map(
i => startPage + i,
);
return {
totalItems: totalItems,
currentPage: currentPage,
pageSize: pageSize,
totalPages: totalPages,
startPage: startPage,
endPage: endPage,
startIndex: startIndex,
endIndex: endIndex,
pages: pages,
};
}