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Pagination JS
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const pagination = { | |
list: [], | |
generateListBySize: (size, predicate) => Array.from({ length: size }).map(predicate), | |
generatePageList: (size, range, total) => pagination.generateListBySize(size, (_, i) => range.start + i).filter(page => page <= total), | |
generateMapRange: (totalRange, size) => ( | |
pagination | |
.generateListBySize(totalRange, (_) => ({})) | |
.reduce((acc, _, i) => { | |
const lastItem = acc?.[i - 1]; | |
const index = i + 1; | |
const start = lastItem ? lastItem.end : index; | |
const end = lastItem ? lastItem.end + size : (index * size) + 1; | |
return [...acc, { start, end }]; | |
}, []) | |
), | |
generate: (listSize, rowsPerPage, paginationSize, currentPage) => { | |
const pagesTotal = Math.ceil(listSize / rowsPerPage); | |
const paginatorTotalRange = Math.ceil(pagesTotal / paginationSize); | |
const list = ( | |
pagination.list.length === 0 | |
? pagination.generateMapRange(paginatorTotalRange, paginationSize, pagesTotal) | |
: pagination.list | |
); | |
const rangeIndex = list.findIndex(range => currentPage >= range.start && currentPage <= range.end); | |
const rangePage = list[rangeIndex]; | |
const shouldMoveRange = rangePage.end === currentPage && rangeIndex < (list.length - 1); | |
const pages = pagination.generatePageList( | |
paginationSize, | |
list?.[shouldMoveRange ? rangeIndex + 1 : rangeIndex], | |
pagesTotal | |
); | |
return { | |
next: currentPage < pagesTotal ? currentPage + 1 : undefined, | |
prev: currentPage <= pagesTotal && currentPage !== 1 ? currentPage - 1 : undefined, | |
total: pagesTotal, | |
page: { | |
current: currentPage, | |
first: 1, | |
last: pagesTotal | |
}, | |
perPage: rowsPerPage, | |
pages: pages | |
}; | |
}, | |
generateMoveOneByOne: (listSize, rowsPerPage, paginationSize, currentPage) => { | |
const pagesTotal = Math.ceil(listSize / rowsPerPage); | |
const regularNumbersPredicate = (_, index) => index === 0 ? currentPage : currentPage + index; | |
const lastNumbersPredicate = (_, index) => ((pagesTotal - paginationSize) + 1) + index; | |
const pages = pagination.generateListBySize(paginationSize, ( | |
currentPage < ((pagesTotal - paginationSize) + 1) | |
? regularNumbersPredicate | |
: lastNumbersPredicate | |
)); | |
return { | |
next: currentPage < pagesTotal ? currentPage + 1 : undefined, | |
prev: currentPage <= pagesTotal && currentPage !== 1 ? currentPage - 1 : undefined, | |
total: pagesTotal, | |
page: { | |
current: currentPage, | |
first: 1, | |
last: pagesTotal | |
}, | |
perPage: rowsPerPage, | |
pages | |
}; | |
} | |
}; | |
// How to use | |
const paginationConfig = { | |
countTotalList: 100, | |
itemsPerPage: 5, | |
paginationSize: 5, | |
currentPage: 1 | |
}; | |
pagination.generate( | |
paginationConfig.countTotalList, | |
paginationConfig.itemsPerPage, | |
paginationConfig.paginationSize, | |
paginationConfig.currentPage // Change page number based on button actions | |
) |
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