pagination.js
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/**
* 分页组件
* @author: djh<jinhu.dong@yoho.cn>
* @date: 2016/6/29
*/
'use strict';
// render pagination ellipse indicator
function _renderEllipse(templateStr) {
return templateStr + '<a>...</a>';
}
// render last page link
function _renderLastPage(templateStr, pageCount, queryParams) {
return templateStr + '<a href="?page=' + pageCount + queryParams + '">' + pageCount + '</a>';
}
/*
* Pagination Component
* @param { Object } pagination pagination constructor
* --- pagination ---
* @param { Integer } limit: per page records number
* @param { String } leftText: prev button text, default is iconfont
* @param { String } rightText: next button text, default is iconfont
* @param { String } paginationClass: pagination ul class, default is 'blk-pagination'
*/
exports.createPagination = function(pagination, options) {
// default options
var limit = 9, // display links number
n, // page number ?page=n
queryParams = '', // paginate with query parameter
page = parseInt(pagination.page, 10), // current page number
leftText = '<i class="iconfont"></i>', // prev
rightText = '<i class="iconfont"></i>', // next
paginationClass = 'blk-pagination'; // pagination <ul> default class
var pageCount,
key, // query params key
lastCharacterOfQueryParams;
var i, // iterator for each refresh page
leftCount, // left pagination link counts for current position
rightCount, // right pagination link counts for current position
start; // left first link number
var template;
if (!pagination) {
return '';
}
// custome options
if (options.hash.limit) {
limit = +options.hash.limit;
}
if (options.hash.leftText) {
leftText = options.hash.leftText;
}
if (options.hash.rightText) {
rightText = options.hash.rightText;
}
if (options.hash.paginationClass) {
paginationClass = options.hash.paginationClass;
}
pageCount = Math.ceil(pagination.total / pagination.limit);
// query params
if (pagination.queryParams) {
queryParams = '&';
for (key in pagination.queryParams) {
if (pagination.queryParams.hasOwnProperty(key) && key !== 'page') {
queryParams += key + '=' + pagination.queryParams[key] + '&';
}
}
// lastCharacterOfQueryParams = queryParams.substring(queryParams.length, -1);
lastCharacterOfQueryParams = queryParams.slice(queryParams.length - 1);
if (lastCharacterOfQueryParams === '&') {
// trim off last & character
queryParams = queryParams.slice(0, queryParams.length - 1);
}
}
template = '<div class="' + paginationClass + '">';
// ========= Previous Button ===============
if (page - 1) {
n = page - 1;
template = template + '<a href="?page=' + n + queryParams + '">' + leftText + '</a>';
}
// ========= Page Numbers Middle ===============
// current is active, and make left page link count equal right link count
i = 0;
leftCount = Math.ceil(limit / 2) - 1;
rightCount = limit - leftCount - 1;
if (page + rightCount > pageCount) {
leftCount = limit - (pageCount - page) - 1;
}
if (page - leftCount < 1) {
leftCount = page - 1;
}
start = page - leftCount;
while (i < limit && i < pageCount) {
// start is every link
n = start;
if (start === page) {
template = template + '<a class="active" href="?page=' + n + queryParams + '">' + n + '</a>';
} else {
// generate left style
if (leftCount >= 4) {
if (i === 0) {
// first page
template = template + '<a href="?page=1' + queryParams + '">1</a>';
} else if (i === 1 || (i === 7 && start <= pageCount - 2)) {
// left and right ...
template = _renderEllipse(template);
} else if (i === 8 && start <= pageCount - 1) {
template = _renderLastPage(template, pageCount, queryParams);
} else {
// other links is normal
template = template +
'<a href="?page=' + n + queryParams + '">' +
n +
'</a>';
}
} else {
if (i === 7 && start <= pageCount - 2) {
// right ...
template = _renderEllipse(template);
} else if (i === 8 && start <= pageCount - 1) {
template = _renderLastPage(template, pageCount, queryParams);
} else {
template = template +
'<a href="?page=' + n + queryParams + '">' +
n +
'</a>';
}
}
}
start++;
i++;
}
// ========= Next page ===============
if (pageCount - page) {
n = page + 1;
template = template + '<a href="?page=' + n + queryParams + '">' + rightText + '</a>';
}
template = template + '</div>';
// html template
return template;
};