140 lines
3.7 KiB
JavaScript
140 lines
3.7 KiB
JavaScript
var App = App || {};
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App.Pager = function(
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_,
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promise,
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api) {
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var totalPages;
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var pageNumber;
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var searchParams;
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var url;
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var cache = {};
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function init(args) {
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url = args.url;
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setSearchParams(args.searchParams);
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if (typeof(args.page) !== 'undefined') {
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setPage(args.page);
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} else {
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setPage(1);
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}
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}
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function getPage() {
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return pageNumber;
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}
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function getTotalPages() {
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return totalPages;
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}
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function prevPage() {
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if (pageNumber > 1) {
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setPage(pageNumber - 1);
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return true;
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}
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return false;
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}
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function nextPage() {
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if (pageNumber < totalPages) {
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setPage(pageNumber + 1);
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return true;
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}
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return false;
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}
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function setPage(newPageNumber) {
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pageNumber = parseInt(newPageNumber);
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if (!pageNumber || isNaN(pageNumber)) {
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throw new Error('Trying to set page to a non-number (' + newPageNumber + ')');
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}
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}
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function getSearchParams() {
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return searchParams;
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}
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function setSearchParams(newSearchParams) {
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setPage(1);
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searchParams = _.extend({}, newSearchParams);
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delete searchParams.page;
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}
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function retrieve() {
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return promise.make(function(resolve, reject) {
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promise.wait(api.get(url, _.extend({}, searchParams, {page: pageNumber})))
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.then(function(response) {
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var pageSize = response.json.pageSize;
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var totalRecords = response.json.totalRecords;
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totalPages = Math.ceil(totalRecords / pageSize);
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resolve(response);
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}).fail(function(response) {
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reject(response);
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});
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});
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}
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function retrieveCached() {
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return promise.make(function(resolve, reject) {
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var cacheKey = JSON.stringify(_.extend({}, searchParams, {url: url, page: getPage()}));
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if (cacheKey in cache) {
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resolve.apply(this, cache[cacheKey]);
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} else {
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promise.wait(retrieve())
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.then(function() {
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cache[cacheKey] = arguments;
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resolve.apply(this, arguments);
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}).fail(function() {
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reject.apply(this, arguments);
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});
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}
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});
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}
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function resetCache() {
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cache = {};
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}
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function getVisiblePages() {
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var pages = [1, totalPages || 1];
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var pagesAroundCurrent = 2;
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for (var i = -pagesAroundCurrent; i <= pagesAroundCurrent; i ++) {
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if (pageNumber + i >= 1 && pageNumber + i <= totalPages) {
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pages.push(pageNumber + i);
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}
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}
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if (pageNumber - pagesAroundCurrent - 1 === 2) {
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pages.push(2);
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}
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if (pageNumber + pagesAroundCurrent + 1 === totalPages - 1) {
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pages.push(totalPages - 1);
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}
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return pages.sort(function(a, b) { return a - b; }).filter(function(item, pos) {
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return !pos || item !== pages[pos - 1];
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});
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}
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return {
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init: init,
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getPage: getPage,
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getTotalPages: getTotalPages,
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prevPage: prevPage,
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nextPage: nextPage,
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setPage: setPage,
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getSearchParams: getSearchParams,
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setSearchParams: setSearchParams,
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retrieve: retrieve,
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retrieveCached: retrieveCached,
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getVisiblePages: getVisiblePages,
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resetCache: resetCache,
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};
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};
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App.DI.register('pager', ['_', 'promise', 'api'], App.Pager);
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