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82 lines
2.3 KiB
JavaScript
82 lines
2.3 KiB
JavaScript
'use strict';
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const qs = require('querystring');
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const _ = require('lodash');
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const pagination = module.exports;
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pagination.create = function (currentPage, pageCount, queryObj) {
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if (pageCount <= 1) {
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return {
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prev: { page: 1, active: currentPage > 1 },
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next: { page: 1, active: currentPage < pageCount },
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first: { page: 1, active: currentPage === 1 },
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last: { page: 1, active: currentPage === pageCount },
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rel: [],
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pages: [],
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currentPage: 1,
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pageCount: 1,
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};
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}
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pageCount = parseInt(pageCount, 10);
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let pagesToShow = [1, 2, pageCount - 1, pageCount];
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currentPage = parseInt(currentPage, 10) || 1;
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const previous = Math.max(1, currentPage - 1);
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const next = Math.min(pageCount, currentPage + 1);
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let startPage = Math.max(1, currentPage - 2);
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if (startPage > pageCount - 5) {
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startPage -= 2 - (pageCount - currentPage);
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}
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let i;
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for (i = 0; i < 5; i += 1) {
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pagesToShow.push(startPage + i);
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}
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pagesToShow = _.uniq(pagesToShow).filter(page => page > 0 && page <= pageCount).sort((a, b) => a - b);
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queryObj = { ...(queryObj || {}) };
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delete queryObj._;
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const pages = pagesToShow.map((page) => {
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queryObj.page = page;
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return { page: page, active: page === currentPage, qs: qs.stringify(queryObj) };
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});
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for (i = pages.length - 1; i > 0; i -= 1) {
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if (pages[i].page - 2 === pages[i - 1].page) {
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pages.splice(i, 0, { page: pages[i].page - 1, active: false, qs: qs.stringify(queryObj) });
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} else if (pages[i].page - 1 !== pages[i - 1].page) {
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pages.splice(i, 0, { separator: true });
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}
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}
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const data = { rel: [], pages: pages, currentPage: currentPage, pageCount: pageCount };
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queryObj.page = previous;
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data.prev = { page: previous, active: currentPage > 1, qs: qs.stringify(queryObj) };
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queryObj.page = next;
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data.next = { page: next, active: currentPage < pageCount, qs: qs.stringify(queryObj) };
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queryObj.page = 1;
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data.first = { page: 1, active: currentPage === 1, qs: qs.stringify(queryObj) };
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queryObj.page = pageCount;
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data.last = { page: pageCount, active: currentPage === pageCount, qs: qs.stringify(queryObj) };
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if (currentPage < pageCount) {
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data.rel.push({
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rel: 'next',
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href: `?${qs.stringify({ ...queryObj, page: next })}`,
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});
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}
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if (currentPage > 1) {
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data.rel.push({
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rel: 'prev',
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href: `?${qs.stringify({ ...queryObj, page: previous })}`,
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});
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}
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return data;
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};
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