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341 lines
15 KiB
JavaScript
341 lines
15 KiB
JavaScript
3 years ago
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(function (global, factory) {
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if (typeof define === "function" && define.amd) {
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define([], factory);
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} else if (typeof exports !== "undefined") {
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factory();
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} else {
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var mod = {
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exports: {}
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};
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factory();
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global.bootstrapTablePipeline = mod.exports;
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}
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})(this, function () {
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'use strict';
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/**
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* @author doug-the-guy
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* @version v1.0.0
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*
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* Boostrap Table Pipeline
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* -----------------------
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*
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* This plugin enables client side data caching for server side requests which will
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* eliminate the need to issue a new request every page change. This will allow
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* for a performance balance for a large data set between returning all data at once
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* (client side paging) and a new server side request (server side paging).
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*
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* There are two new options:
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* - usePipeline: enables this feature
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* - pipelineSize: the size of each cache window
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*
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* The size of the pipeline must be evenly divisible by the current page size. This is
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* assured by rounding up to the nearest evenly divisible value. For example, if
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* the pipeline size is 4990 and the current page size is 25, then pipeline size will
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* be dynamically set to 5000.
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*
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* The cache windows are computed based on the pipeline size and the total number of rows
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* returned by the server side query. For example, with pipeline size 500 and total rows
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* 1300, the cache windows will be:
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*
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* [{'lower': 0, 'upper': 499}, {'lower': 500, 'upper': 999}, {'lower': 1000, 'upper': 1499}]
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*
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* Using the limit (i.e. the pipelineSize) and offset parameters, the server side request
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* **MUST** return only the data in the requested cache window **AND** the total number of rows.
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* To wit, the server side code must use the offset and limit parameters to prepare the response
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* data.
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*
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* On a page change, the new offset is checked if it is within the current cache window. If so,
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* the requested page data is returned from the cached data set. Otherwise, a new server side
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* request will be issued for the new cache window.
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*
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* The current cached data is only invalidated on these events:
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* * sorting
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* * searching
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* * page size change
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* * page change moves into a new cache window
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*
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* There are two new events:
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* - cached-data-hit.bs.table: issued when cached data is used on a page change
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* - cached-data-reset.bs.table: issued when the cached data is invalidated and a
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* new server side request is issued
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*
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**/
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(function ($) {
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'use strict';
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var Utils = $.fn.bootstrapTable.utils;
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$.extend($.fn.bootstrapTable.defaults, {
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usePipeline: false,
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pipelineSize: 1000,
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onCachedDataHit: function onCachedDataHit(data) {
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return false;
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},
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onCachedDataReset: function onCachedDataReset(data) {
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return false;
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}
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});
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$.extend($.fn.bootstrapTable.Constructor.EVENTS, {
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'cached-data-hit.bs.table': 'onCachedDataHit',
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'cached-data-reset.bs.table': 'onCachedDataReset'
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});
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var BootstrapTable = $.fn.bootstrapTable.Constructor,
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_init = BootstrapTable.prototype.init,
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_initServer = BootstrapTable.prototype.initServer,
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_onSearch = BootstrapTable.prototype.onSearch,
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_onSort = BootstrapTable.prototype.onSort,
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_onPageListChange = BootstrapTable.prototype.onPageListChange;
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BootstrapTable.prototype.init = function () {
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// needs to be called before initServer()
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this.initPipeline();
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_init.apply(this, Array.prototype.slice.apply(arguments));
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};
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BootstrapTable.prototype.initPipeline = function () {
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this.cacheRequestJSON = {};
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this.cacheWindows = [];
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this.currWindow = 0;
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this.resetCache = true;
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};
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BootstrapTable.prototype.onSearch = function (event) {
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/* force a cache reset on search */
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if (this.options.usePipeline) {
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this.resetCache = true;
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}
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_onSearch.apply(this, Array.prototype.slice.apply(arguments));
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};
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BootstrapTable.prototype.onSort = function (event) {
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/* force a cache reset on sort */
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if (this.options.usePipeline) {
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this.resetCache = true;
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}
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_onSort.apply(this, Array.prototype.slice.apply(arguments));
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};
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BootstrapTable.prototype.onPageListChange = function (event) {
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/* rebuild cache window on page size change */
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var target = $(event.currentTarget);
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var newPageSize = parseInt(target.text());
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this.options.pipelineSize = this.calculatePipelineSize(this.options.pipelineSize, newPageSize);
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this.resetCache = true;
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_onPageListChange.apply(this, Array.prototype.slice.apply(arguments));
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};
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BootstrapTable.prototype.calculatePipelineSize = function (pipelineSize, pageSize) {
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/* calculate pipeline size by rounding up to the nearest value evenly divisible
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* by the pageSize */
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if (pageSize == 0) return 0;
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return Math.ceil(pipelineSize / pageSize) * pageSize;
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};
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BootstrapTable.prototype.setCacheWindows = function () {
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/* set cache windows based on the total number of rows returned by server side
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* request and the pipelineSize */
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this.cacheWindows = [];
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var numWindows = this.options.totalRows / this.options.pipelineSize;
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for (var i = 0; i <= numWindows; i++) {
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var b = i * this.options.pipelineSize;
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this.cacheWindows[i] = { 'lower': b, 'upper': b + this.options.pipelineSize - 1 };
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}
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};
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BootstrapTable.prototype.setCurrWindow = function (offset) {
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/* set the current cache window index, based on where the current offset falls */
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this.currWindow = 0;
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for (var i = 0; i < this.cacheWindows.length; i++) {
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if (this.cacheWindows[i].lower <= offset && offset <= this.cacheWindows[i].upper) {
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this.currWindow = i;
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break;
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}
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}
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};
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BootstrapTable.prototype.drawFromCache = function (offset, limit) {
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/* draw rows from the cache using offset and limit */
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var res = $.extend(true, {}, this.cacheRequestJSON);
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var drawStart = offset - this.cacheWindows[this.currWindow].lower;
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var drawEnd = drawStart + limit;
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res.rows = res.rows.slice(drawStart, drawEnd);
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return res;
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};
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BootstrapTable.prototype.initServer = function (silent, query, url) {
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/* determine if requested data is in cache (on paging) or if
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* a new ajax request needs to be issued (sorting, searching, paging
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* moving outside of cached data, page size change)
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* initial version of this extension will entirely override base initServer
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**/
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var data = {};
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var index = this.header.fields.indexOf(this.options.sortName);
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var params = {
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searchText: this.searchText,
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sortName: this.options.sortName,
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sortOrder: this.options.sortOrder
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};
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var request = null;
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if (this.header.sortNames[index]) {
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params.sortName = this.header.sortNames[index];
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}
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if (this.options.pagination && this.options.sidePagination === 'server') {
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params.pageSize = this.options.pageSize === this.options.formatAllRows() ? this.options.totalRows : this.options.pageSize;
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params.pageNumber = this.options.pageNumber;
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}
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if (!(url || this.options.url) && !this.options.ajax) {
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return;
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}
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var useAjax = true;
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if (this.options.queryParamsType === 'limit') {
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params = {
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searchText: params.searchText,
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sortName: params.sortName,
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sortOrder: params.sortOrder
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};
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if (this.options.pagination && this.options.sidePagination === 'server') {
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params.limit = this.options.pageSize === this.options.formatAllRows() ? this.options.totalRows : this.options.pageSize;
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params.offset = (this.options.pageSize === this.options.formatAllRows() ? this.options.totalRows : this.options.pageSize) * (this.options.pageNumber - 1);
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if (this.options.usePipeline) {
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// if cacheWindows is empty, this is the initial request
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if (!this.cacheWindows.length) {
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useAjax = true;
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params.drawOffset = params.offset;
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// cache exists: determine if the page request is entirely within the current cached window
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} else {
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var w = this.cacheWindows[this.currWindow];
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// case 1: reset cache but stay within current window (e.g. column sort)
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// case 2: move outside of the current window (e.g. search or paging)
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// since each cache window is aligned with the current page size
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// checking if params.offset is outside the current window is sufficient.
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// need to requery for preceding or succeeding cache window
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// also handle case
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if (this.resetCache || params.offset < w.lower || params.offset > w.upper) {
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useAjax = true;
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this.setCurrWindow(params.offset);
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// store the relative offset for drawing the page data afterwards
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params.drawOffset = params.offset;
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// now set params.offset to the lower bound of the new cache window
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// the server will return that whole cache window
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params.offset = this.cacheWindows[this.currWindow].lower;
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// within current cache window
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} else {
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useAjax = false;
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}
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}
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} else {
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if (params.limit === 0) {
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delete params.limit;
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}
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}
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}
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}
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// force an ajax call - this is on search, sort or page size change
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if (this.resetCache) {
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useAjax = true;
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this.resetCache = false;
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}
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if (this.options.usePipeline && useAjax) {
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/* in this scenario limit is used on the server to get the cache window
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* and drawLimit is used to get the page data afterwards */
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params.drawLimit = params.limit;
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params.limit = this.options.pipelineSize;
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}
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// cached results can be used
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if (!useAjax) {
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var res = this.drawFromCache(params.offset, params.limit);
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this.load(res);
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this.trigger('load-success', res);
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this.trigger('cached-data-hit', res);
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return;
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}
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// cached results can't be used
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// continue base initServer code
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if (!$.isEmptyObject(this.filterColumnsPartial)) {
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params.filter = JSON.stringify(this.filterColumnsPartial, null);
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}
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data = Utils.calculateObjectValue(this.options, this.options.queryParams, [params], data);
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$.extend(data, query || {});
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// false to stop request
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if (data === false) {
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return;
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}
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if (!silent) {
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this.$tableLoading.show();
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}
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var self = this;
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request = $.extend({}, Utils.calculateObjectValue(null, this.options.ajaxOptions), {
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type: this.options.method,
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url: url || this.options.url,
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data: this.options.contentType === 'application/json' && this.options.method === 'post' ? JSON.stringify(data) : data,
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cache: this.options.cache,
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contentType: this.options.contentType,
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dataType: this.options.dataType,
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success: function success(res) {
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res = Utils.calculateObjectValue(self.options, self.options.responseHandler, [res], res);
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// cache results if using pipelining
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if (self.options.usePipeline) {
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// store entire request in cache
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self.cacheRequestJSON = $.extend(true, {}, res);
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// this gets set in load() also but needs to be set before
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// setting cacheWindows
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self.options.totalRows = res[self.options.totalField];
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// if this is a search, potentially less results will be returned
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// so cache windows need to be rebuilt. Otherwise it
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// will come out the same
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self.setCacheWindows();
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self.setCurrWindow(params.drawOffset);
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// just load data for the page
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res = self.drawFromCache(params.drawOffset, params.drawLimit);
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self.trigger('cached-data-reset', res);
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}
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self.load(res);
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self.trigger('load-success', res);
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if (!silent) self.$tableLoading.hide();
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},
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error: function error(res) {
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var data = [];
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if (self.options.sidePagination === 'server') {
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data = {};
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data[self.options.totalField] = 0;
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data[self.options.dataField] = [];
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}
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self.load(data);
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self.trigger('load-error', res.status, res);
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if (!silent) self.$tableLoading.hide();
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}
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});
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if (this.options.ajax) {
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Utils.calculateObjectValue(this, this.options.ajax, [request], null);
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} else {
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if (this._xhr && this._xhr.readyState !== 4) {
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this._xhr.abort();
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}
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this._xhr = $.ajax(request);
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}
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};
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$.fn.bootstrapTable.methods.push();
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})(jQuery);
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});
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