pager.js
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'use strict';
const _ = require('lodash');
const handleFilterUrl = (originParam, newParam, delParam) => {
let dest = '?';
let tempOriginParam = {};
delParam = delParam || {};
tempOriginParam = Object.assign(tempOriginParam, originParam, newParam);
delete tempOriginParam.uid;
_.forEach(tempOriginParam, function(value, key) {
if (!delParam[key] && value) {
dest += `${key}=${value}&`;
}
});
return _.trim(dest, '&');
};
exports.handlePagerData = (total, params) => {
let result = {
prePage: {
url: ''
},
nextPage: {
url: ''
},
pages: []
};
let currentPage = parseInt(_.get(params, 'page', 1), 10); // 当前页
let perPageCount = parseInt(_.get(params, 'limit', 10), 10); // 每页商品数
let totalPage = _.ceil(total / perPageCount); // 总页数
result.count = total;
result.curPage = currentPage;
result.totalPages = totalPage;
if (currentPage === 1) {
// 当前页为 1,一定没有上一页
delete result.prePage;
} else {
result.prePage.url = handleFilterUrl(params, {page: currentPage - 1});
}
if (currentPage === totalPage) {
// 当前页为最后一页,一定没有下一页
delete result.nextPage;
} else {
result.nextPage.url = handleFilterUrl(params, {page: currentPage + 1});
}
if (totalPage === 0) {
return {
count: 0,
curPage: 0,
totalPages: 0
};
}
if (totalPage === 1) {
return result;
}
// 页码临时数据
let pages = [];
if (currentPage > 2 && currentPage <= totalPage - 2) {
for (let i = currentPage - 2; i <= ((currentPage + 2) > totalPage ? totalPage : (currentPage + 2)); i++) {
pages.push({
url: handleFilterUrl(params, {page: i}),
num: i,
cur: currentPage === i
});
}
// 处理页码小于等于 2 的情况
} else if (currentPage <= 2) {
for (let i = 1; i <= (totalPage < 5 ? totalPage : 5); i++) {
pages.push({
url: handleFilterUrl(params, {page: i}),
num: i,
cur: currentPage === i
});
}
} else if (currentPage > totalPage - 2) {
for (let i = totalPage; i >= totalPage - 4; i--) {
if (i > 0) {
pages.push({
url: handleFilterUrl(params, {page: i}),
num: i,
cur: currentPage === i
});
}
}
pages = _.sortBy(pages, ['num']);
}
let prevPages = [];
let nextPages = [];
if (_.size(pages) === 5) {
if (currentPage > 4) {
prevPages.push({
url: handleFilterUrl(params, {page: 1}),
num: 1
});
prevPages.push({
num: '...'
});
}
if (currentPage < totalPage - 2 && totalPage > 5) {
nextPages.push({
num: '...'
});
nextPages.push({
url: handleFilterUrl(params, {page: totalPage}),
num: totalPage
});
}
}
result.pages = _.concat(prevPages, pages, nextPages);
return result;
};