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