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60 lines
2.1 KiB
60 lines
2.1 KiB
3 years ago
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"use strict";
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function paginate(totalItems, currentPage, pageSize, maxPages) {
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if (currentPage === void 0) { currentPage = 1; }
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if (pageSize === void 0) { pageSize = 10; }
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if (maxPages === void 0) { maxPages = 10; }
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// calculate total pages
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var totalPages = Math.ceil(totalItems / pageSize);
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// ensure current page isn't out of range
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if (currentPage < 1) {
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currentPage = 1;
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}
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else if (currentPage > totalPages) {
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currentPage = totalPages;
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}
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var startPage, endPage;
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if (totalPages <= maxPages) {
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// total pages less than max so show all pages
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startPage = 1;
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endPage = totalPages;
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}
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else {
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// total pages more than max so calculate start and end pages
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var maxPagesBeforeCurrentPage = Math.floor(maxPages / 2);
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var maxPagesAfterCurrentPage = Math.ceil(maxPages / 2) - 1;
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if (currentPage <= maxPagesBeforeCurrentPage) {
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// current page near the start
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startPage = 1;
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endPage = maxPages;
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}
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else if (currentPage + maxPagesAfterCurrentPage >= totalPages) {
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// current page near the end
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startPage = totalPages - maxPages + 1;
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endPage = totalPages;
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}
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else {
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// current page somewhere in the middle
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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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// calculate start and end item indexes
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var startIndex = (currentPage - 1) * pageSize;
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var endIndex = Math.min(startIndex + pageSize - 1, totalItems - 1);
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// create an array of pages to ng-repeat in the pager control
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var pages = Array.from(Array((endPage + 1) - startPage).keys()).map(function (i) { return startPage + i; });
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// return object with all pager properties required by the view
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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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module.exports = paginate;
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