| |
| |
| |
| function pageCount(total, perPage) { |
| if (!Number.isInteger(perPage) || perPage <= 0) throw new RangeError('perPage pozitif tam sayı olmalı'); |
| if (total < 0) throw new RangeError('total negatif olamaz'); |
| return Math.max(1, Math.ceil(total / perPage)); |
| } |
|
|
| function clampPage(page, count) { |
| if (page < 1) return 1; |
| if (page > count) return count; |
| return page; |
| } |
|
|
| |
| function pageItems(items, page, perPage) { |
| const count = pageCount(items.length, perPage); |
| const p = clampPage(page, count); |
| const start = (p - 1) * perPage; |
| return items.slice(start, start + perPage); |
| } |
|
|
| |
| |
| |
| |
| function pageButtons(current, count, window = 1) { |
| const pages = []; |
| for (let i = 1; i <= count; i++) { |
| if (i === 1 || i === count || Math.abs(i - current) <= window) pages.push(i); |
| } |
| const out = []; |
| let prev = 0; |
| for (const p of pages) { |
| if (p - prev === 2) out.push(prev + 1); |
| else if (p - prev > 2) out.push('…'); |
| out.push(p); |
| prev = p; |
| } |
| return out; |
| } |
|
|
| module.exports = { pageCount, clampPage, pageItems, pageButtons }; |
|
|
