pager.js
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/**
* 分页处理
* @author: yyq<yanqing.yang@yoho.cn>
* @date: 2016/8/19
*/
'use strict';
const _ = require('lodash');
/**
* 拼接url
* @function joinUrl
* @param params 要拼接的 参数
* @returns {string}
*/
const joinUrl = (params) => {
let dest = '?';
_.forEach(params, function(value, key) {
dest += `${key}=${value}&`;
});
return _.trim(dest, '&');
};
/**
* 设置分页
* @setPager setPager
* @param total 总页数
* @param params 参数
* @returns {object}
*/
exports.setPager = (total, params)=>{
let resData = {};
let cutStatus, // 切割状态 1：去头 2：去尾 3：双切
i;
let pages = [];
let currentPage = parseInt(params.page || 1, 10); // 当前页
for (i = currentPage - 2; i <= currentPage + 2; i++) {
if (i < 1) {
cutStatus = 1;
continue;
}
if (i > total) {
cutStatus = cutStatus ? 3 : 2;
continue;
}
pages.push({
url: joinUrl(Object.assign(params, {page: i})),
num: i,
cur: currentPage === i
});
}
// 分页中部补全
let len = 5 - pages.length;
let list = [];
if (cutStatus === 1) {
for (i = 1; i <= len; i++) {
let p = currentPage + i + 2;
if (p > total) {
break;
}
list.push({
url: joinUrl(Object.assign(params, {page: p})),
num: p
});
}
pages = _.concat(pages, list);
} else if (cutStatus === 2) {
for (i = 1; i <= len; i++) {
let p = currentPage - i - 2;
if (p < 1) {
break;
}
list.push({
url: joinUrl(Object.assign(params, {page: p})),
num: p
});
}
pages = _.concat(list, pages);
}
// 分页头尾补全
let fnum = _.get(_.head(pages), 'num', 1),
lnum = _.get(_.last(pages), 'num', 1);
if (fnum > 1) {
if (fnum > 2) {
pages = _.concat({
url: joinUrl(Object.assign(params, {page: 1})),
num: 1
}, {num: '...'}, pages);
} else {
pages = _.concat({
url: '?page=1',
num: 1
}, pages);
}
}
if (lnum < total) {
if (lnum < total - 1) {
pages = _.concat(pages, {num: '...'}, {
url: joinUrl(Object.assign(params, {page: total})),
num: total
});
} else {
pages = _.concat(pages, {
url: joinUrl(Object.assign(params, {page: total})),
num: total
});
}
}
resData.pages = pages;
// 上一页
if (currentPage > 1) {
resData.prePage = {url: joinUrl(Object.assign(params, {page: currentPage - 1}))};
}
// 下一页
if (currentPage < total) {
resData.nextPage = {url: joinUrl(Object.assign(params, {page: currentPage + 1}))};
}
return resData;
};