/ajax/libs/backbone-pageable/1.4.7/backbone-pageable.js
JavaScript | 1334 lines | 632 code | 151 blank | 551 comment | 231 complexity | 848711767ffdabc80bd94efe179945e4 MD5 | raw file
- /*
- backbone-pageable 1.4.7
- http://github.com/backbone-paginator/backbone-pageable
- Copyright (c) 2013 Jimmy Yuen Ho Wong
- Licensed under the MIT @license.
- */
- (function (factory) {
- // CommonJS
- if (typeof exports == "object") {
- module.exports = factory(require("underscore"), require("backbone"));
- }
- // AMD
- else if (typeof define == "function" && define.amd) {
- define(["underscore", "backbone"], factory);
- }
- // Browser
- else if (typeof _ !== "undefined" && typeof Backbone !== "undefined") {
- var oldPageableCollection = Backbone.PageableCollection;
- var PageableCollection = factory(_, Backbone);
- /**
- __BROWSER ONLY__
- If you already have an object named `PageableCollection` attached to the
- `Backbone` module, you can use this to return a local reference to this
- Backbone.PageableCollection class and reset the name
- Backbone.PageableCollection to its previous definition.
- // The left hand side gives you a reference to this
- // Backbone.PageableCollection implementation, the right hand side
- // resets Backbone.PageableCollection to your other
- // Backbone.PageableCollection.
- var PageableCollection = Backbone.PageableCollection.noConflict();
- @static
- @member Backbone.PageableCollection
- @return {Backbone.PageableCollection}
- */
- Backbone.PageableCollection.noConflict = function () {
- Backbone.PageableCollection = oldPageableCollection;
- return PageableCollection;
- };
- }
- }(function (_, Backbone) {
- "use strict";
- var _extend = _.extend;
- var _omit = _.omit;
- var _clone = _.clone;
- var _each = _.each;
- var _pick = _.pick;
- var _contains = _.contains;
- var _isEmpty = _.isEmpty;
- var _pairs = _.pairs;
- var _invert = _.invert;
- var _isArray = _.isArray;
- var _isFunction = _.isFunction;
- var _isObject = _.isObject;
- var _keys = _.keys;
- var _isUndefined = _.isUndefined;
- var _result = _.result;
- var ceil = Math.ceil;
- var floor = Math.floor;
- var max = Math.max;
- var BBColProto = Backbone.Collection.prototype;
- function finiteInt (val, name) {
- if (!_.isNumber(val) || _.isNaN(val) || !_.isFinite(val) || ~~val !== val) {
- throw new TypeError("`" + name + "` must be a finite integer");
- }
- return val;
- }
- function queryStringToParams (qs) {
- var kvp, k, v, ls, params = {}, decode = decodeURIComponent;
- var kvps = qs.split('&');
- for (var i = 0, l = kvps.length; i < l; i++) {
- var param = kvps[i];
- kvp = param.split('='), k = kvp[0], v = kvp[1] || true;
- k = decode(k), v = decode(v), ls = params[k];
- if (_isArray(ls)) ls.push(v);
- else if (ls) params[k] = [ls, v];
- else params[k] = v;
- }
- return params;
- }
- // hack to make sure the whatever event handlers for this event is run
- // before func is, and the event handlers that func will trigger.
- function runOnceAtLastHandler (col, event, func) {
- var eventHandlers = col._events[event];
- if (eventHandlers && eventHandlers.length) {
- var lastHandler = eventHandlers[eventHandlers.length - 1];
- var oldCallback = lastHandler.callback;
- lastHandler.callback = function () {
- try {
- oldCallback.apply(this, arguments);
- func();
- }
- catch (e) {
- throw e;
- }
- finally {
- lastHandler.callback = oldCallback;
- }
- };
- }
- else func();
- }
- var PARAM_TRIM_RE = /[\s'"]/g;
- var URL_TRIM_RE = /[<>\s'"]/g;
- /**
- Drop-in replacement for Backbone.Collection. Supports server-side and
- client-side pagination and sorting. Client-side mode also support fully
- multi-directional synchronization of changes between pages.
- @class Backbone.PageableCollection
- @extends Backbone.Collection
- */
- var PageableCollection = Backbone.PageableCollection = Backbone.Collection.extend({
- /**
- The container object to store all pagination states.
- You can override the default state by extending this class or specifying
- them in an `options` hash to the constructor.
- @property {Object} state
- @property {0|1} [state.firstPage=1] The first page index. Set to 0 if
- your server API uses 0-based indices. You should only override this value
- during extension, initialization or reset by the server after
- fetching. This value should be read only at other times.
- @property {number} [state.lastPage=null] The last page index. This value
- is __read only__ and it's calculated based on whether `firstPage` is 0 or
- 1, during bootstrapping, fetching and resetting. Please don't change this
- value under any circumstances.
- @property {number} [state.currentPage=null] The current page index. You
- should only override this value during extension, initialization or reset
- by the server after fetching. This value should be read only at other
- times. Can be a 0-based or 1-based index, depending on whether
- `firstPage` is 0 or 1. If left as default, it will be set to `firstPage`
- on initialization.
- @property {number} [state.pageSize=25] How many records to show per
- page. This value is __read only__ after initialization, if you want to
- change the page size after initialization, you must call #setPageSize.
- @property {number} [state.totalPages=null] How many pages there are. This
- value is __read only__ and it is calculated from `totalRecords`.
- @property {number} [state.totalRecords=null] How many records there
- are. This value is __required__ under server mode. This value is optional
- for client mode as the number will be the same as the number of models
- during bootstrapping and during fetching, either supplied by the server
- in the metadata, or calculated from the size of the response.
- @property {string} [state.sortKey=null] The model attribute to use for
- sorting.
- @property {-1|0|1} [state.order=-1] The order to use for sorting. Specify
- -1 for ascending order or 1 for descending order. If 0, no client side
- sorting will be done and the order query parameter will not be sent to
- the server during a fetch.
- */
- state: {
- firstPage: 1,
- lastPage: null,
- currentPage: null,
- pageSize: 25,
- totalPages: null,
- totalRecords: null,
- sortKey: null,
- order: -1
- },
- /**
- @property {"server"|"client"|"infinite"} [mode="server"] The mode of
- operations for this collection. `"server"` paginates on the server-side,
- `"client"` paginates on the client-side and `"infinite"` paginates on the
- server-side for APIs that do not support `totalRecords`.
- */
- mode: "server",
- /**
- A translation map to convert Backbone.PageableCollection state attributes
- to the query parameters accepted by your server API.
- You can override the default state by extending this class or specifying
- them in `options.queryParams` object hash to the constructor.
- @property {Object} queryParams
- @property {string} [queryParams.currentPage="page"]
- @property {string} [queryParams.pageSize="per_page"]
- @property {string} [queryParams.totalPages="total_pages"]
- @property {string} [queryParams.totalRecords="total_entries"]
- @property {string} [queryParams.sortKey="sort_by"]
- @property {string} [queryParams.order="order"]
- @property {string} [queryParams.directions={"-1": "asc", "1": "desc"}] A
- map for translating a Backbone.PageableCollection#state.order constant to
- the ones your server API accepts.
- */
- queryParams: {
- currentPage: "page",
- pageSize: "per_page",
- totalPages: "total_pages",
- totalRecords: "total_entries",
- sortKey: "sort_by",
- order: "order",
- directions: {
- "-1": "asc",
- "1": "desc"
- }
- },
- /**
- __CLIENT MODE ONLY__
- This collection is the internal storage for the bootstrapped or fetched
- models. You can use this if you want to operate on all the pages.
- @property {Backbone.Collection} fullCollection
- */
- /**
- Given a list of models or model attributues, bootstraps the full
- collection in client mode or infinite mode, or just the page you want in
- server mode.
- If you want to initialize a collection to a different state than the
- default, you can specify them in `options.state`. Any state parameters
- supplied will be merged with the default. If you want to change the
- default mapping from #state keys to your server API's query parameter
- names, you can specifiy an object hash in `option.queryParams`. Likewise,
- any mapping provided will be merged with the default. Lastly, all
- Backbone.Collection constructor options are also accepted.
- See:
- - Backbone.PageableCollection#state
- - Backbone.PageableCollection#queryParams
- - [Backbone.Collection#initialize](http://backbonejs.org/#Collection-constructor)
- @param {Array.<Object>} [models]
- @param {Object} [options]
- @param {function(*, *): number} [options.comparator] If specified, this
- comparator is set to the current page under server mode, or the #fullCollection
- otherwise.
- @param {boolean} [options.full] If `false` and either a
- `options.comparator` or `sortKey` is defined, the comparator is attached
- to the current page. Default is `true` under client or infinite mode and
- the comparator will be attached to the #fullCollection.
- @param {Object} [options.state] The state attributes overriding the defaults.
- @param {string} [options.state.sortKey] The model attribute to use for
- sorting. If specified instead of `options.comparator`, a comparator will
- be automatically created using this value, and optionally a sorting order
- specified in `options.state.order`. The comparator is then attached to
- the new collection instance.
- @param {-1|1} [options.state.order] The order to use for sorting. Specify
- -1 for ascending order and 1 for descending order.
- @param {Object} [options.queryParam]
- */
- constructor: function (models, options) {
- BBColProto.constructor.apply(this, arguments);
- options = options || {};
- var mode = this.mode = options.mode || this.mode || PageableProto.mode;
- var queryParams = _extend({}, PageableProto.queryParams, this.queryParams,
- options.queryParams || {});
- queryParams.directions = _extend({},
- PageableProto.queryParams.directions,
- this.queryParams.directions,
- queryParams.directions || {});
- this.queryParams = queryParams;
- var state = this.state = _extend({}, PageableProto.state, this.state,
- options.state || {});
- state.currentPage = state.currentPage == null ?
- state.firstPage :
- state.currentPage;
- if (!_isArray(models)) models = models ? [models] : [];
- models = models.slice();
- if (mode != "server" && state.totalRecords == null && !_isEmpty(models)) {
- state.totalRecords = models.length;
- }
- this.switchMode(mode, _extend({fetch: false,
- resetState: false,
- models: models}, options));
- var comparator = options.comparator;
- if (state.sortKey && !comparator) {
- this.setSorting(state.sortKey, state.order, options);
- }
- if (mode != "server") {
- var fullCollection = this.fullCollection;
- if (comparator && options.full) {
- this.comparator = null;
- fullCollection.comparator = comparator;
- }
- if (options.full) fullCollection.sort();
- // make sure the models in the current page and full collection have the
- // same references
- if (models && !_isEmpty(models)) {
- this.reset(models, _extend({silent: true}, options));
- this.getPage(state.currentPage);
- models.splice.apply(models, [0, models.length].concat(this.models));
- }
- }
- this._initState = _clone(this.state);
- },
- /**
- Makes a Backbone.Collection that contains all the pages.
- @private
- @param {Array.<Object|Backbone.Model>} models
- @param {Object} options Options for Backbone.Collection constructor.
- @return {Backbone.Collection}
- */
- _makeFullCollection: function (models, options) {
- var properties = ["url", "model", "sync", "comparator"];
- var thisProto = this.constructor.prototype;
- var i, length, prop;
- var proto = {};
- for (i = 0, length = properties.length; i < length; i++) {
- prop = properties[i];
- if (!_isUndefined(thisProto[prop])) {
- proto[prop] = thisProto[prop];
- }
- }
- var fullCollection = new (Backbone.Collection.extend(proto))(models, options);
- for (i = 0, length = properties.length; i < length; i++) {
- prop = properties[i];
- if (this[prop] !== thisProto[prop]) {
- fullCollection[prop] = this[prop];
- }
- }
- return fullCollection;
- },
- /**
- Factory method that returns a Backbone event handler that responses to
- the `add`, `remove`, `reset`, and the `sort` events. The returned event
- handler will synchronize the current page collection and the full
- collection's models.
- @private
- @param {Backbone.PageableCollection} pageCol
- @param {Backbone.Collection} fullCol
- @return {function(string, Backbone.Model, Backbone.Collection, Object)}
- Collection event handler
- */
- _makeCollectionEventHandler: function (pageCol, fullCol) {
- return function collectionEventHandler (event, model, collection, options) {
- var handlers = pageCol._handlers;
- _each(_keys(handlers), function (event) {
- var handler = handlers[event];
- pageCol.off(event, handler);
- fullCol.off(event, handler);
- });
- var state = _clone(pageCol.state);
- var firstPage = state.firstPage;
- var currentPage = firstPage === 0 ?
- state.currentPage :
- state.currentPage - 1;
- var pageSize = state.pageSize;
- var pageStart = currentPage * pageSize, pageEnd = pageStart + pageSize;
- if (event == "add") {
- var pageIndex, fullIndex, addAt, colToAdd, options = options || {};
- if (collection == fullCol) {
- fullIndex = fullCol.indexOf(model);
- if (fullIndex >= pageStart && fullIndex < pageEnd) {
- colToAdd = pageCol;
- pageIndex = addAt = fullIndex - pageStart;
- }
- }
- else {
- pageIndex = pageCol.indexOf(model);
- fullIndex = pageStart + pageIndex;
- colToAdd = fullCol;
- var addAt = !_isUndefined(options.at) ?
- options.at + pageStart :
- fullIndex;
- }
- if (!options.onRemove) {
- ++state.totalRecords;
- delete options.onRemove;
- }
- pageCol.state = pageCol._checkState(state);
- if (colToAdd) {
- colToAdd.add(model, _extend({}, options || {}, {at: addAt}));
- var modelToRemove = pageIndex >= pageSize ?
- model :
- !_isUndefined(options.at) && addAt < pageEnd && pageCol.length > pageSize ?
- pageCol.at(pageSize) :
- null;
- if (modelToRemove) {
- runOnceAtLastHandler(collection, event, function () {
- pageCol.remove(modelToRemove, {onAdd: true});
- });
- }
- }
- }
- // remove the model from the other collection as well
- if (event == "remove") {
- if (!options.onAdd) {
- // decrement totalRecords and update totalPages and lastPage
- if (!--state.totalRecords) {
- state.totalRecords = null;
- state.totalPages = null;
- }
- else {
- var totalPages = state.totalPages = ceil(state.totalRecords / pageSize);
- state.lastPage = firstPage === 0 ? totalPages - 1 : totalPages || firstPage;
- if (state.currentPage > totalPages) state.currentPage = state.lastPage;
- }
- pageCol.state = pageCol._checkState(state);
- var nextModel, removedIndex = options.index;
- if (collection == pageCol) {
- if (nextModel = fullCol.at(pageEnd)) {
- runOnceAtLastHandler(pageCol, event, function () {
- pageCol.push(nextModel, {onRemove: true});
- });
- }
- fullCol.remove(model);
- }
- else if (removedIndex >= pageStart && removedIndex < pageEnd) {
- if (nextModel = fullCol.at(pageEnd - 1)) {
- runOnceAtLastHandler(pageCol, event, function() {
- pageCol.push(nextModel, {onRemove: true});
- });
- }
- pageCol.remove(model);
- }
- }
- else delete options.onAdd;
- }
- if (event == "reset") {
- options = collection;
- collection = model;
- // Reset that's not a result of getPage
- if (collection == pageCol && options.from == null &&
- options.to == null) {
- var head = fullCol.models.slice(0, pageStart);
- var tail = fullCol.models.slice(pageStart + pageCol.models.length);
- fullCol.reset(head.concat(pageCol.models).concat(tail), options);
- }
- else if (collection == fullCol) {
- if (!(state.totalRecords = fullCol.models.length)) {
- state.totalRecords = null;
- state.totalPages = null;
- }
- if (pageCol.mode == "client") {
- state.lastPage = state.currentPage = state.firstPage;
- }
- pageCol.state = pageCol._checkState(state);
- pageCol.reset(fullCol.models.slice(pageStart, pageEnd),
- _extend({}, options, {parse: false}));
- }
- }
- if (event == "sort") {
- options = collection;
- collection = model;
- if (collection === fullCol) {
- pageCol.reset(fullCol.models.slice(pageStart, pageEnd),
- _extend({}, options, {parse: false}));
- }
- }
- _each(_keys(handlers), function (event) {
- var handler = handlers[event];
- _each([pageCol, fullCol], function (col) {
- col.on(event, handler);
- var callbacks = col._events[event] || [];
- callbacks.unshift(callbacks.pop());
- });
- });
- };
- },
- /**
- Sanity check this collection's pagination states. Only perform checks
- when all the required pagination state values are defined and not null.
- If `totalPages` is undefined or null, it is set to `totalRecords` /
- `pageSize`. `lastPage` is set according to whether `firstPage` is 0 or 1
- when no error occurs.
- @private
- @throws {TypeError} If `totalRecords`, `pageSize`, `currentPage` or
- `firstPage` is not a finite integer.
- @throws {RangeError} If `pageSize`, `currentPage` or `firstPage` is out
- of bounds.
- @return {Object} Returns the `state` object if no error was found.
- */
- _checkState: function (state) {
- var mode = this.mode;
- var links = this.links;
- var totalRecords = state.totalRecords;
- var pageSize = state.pageSize;
- var currentPage = state.currentPage;
- var firstPage = state.firstPage;
- var totalPages = state.totalPages;
- if (totalRecords != null && pageSize != null && currentPage != null &&
- firstPage != null && (mode == "infinite" ? links : true)) {
- totalRecords = finiteInt(totalRecords, "totalRecords");
- pageSize = finiteInt(pageSize, "pageSize");
- currentPage = finiteInt(currentPage, "currentPage");
- firstPage = finiteInt(firstPage, "firstPage");
- if (pageSize < 1) {
- throw new RangeError("`pageSize` must be >= 1");
- }
- totalPages = state.totalPages = ceil(totalRecords / pageSize);
- if (firstPage < 0 || firstPage > 1) {
- throw new RangeError("`firstPage must be 0 or 1`");
- }
- state.lastPage = firstPage === 0 ? max(0, totalPages - 1) : totalPages || firstPage;
- if (mode == "infinite") {
- if (!links[currentPage + '']) {
- throw new RangeError("No link found for page " + currentPage);
- }
- }
- else if (currentPage < firstPage ||
- (totalPages > 0 &&
- (firstPage ? currentPage > totalPages : currentPage >= totalPages))) {
- throw new RangeError("`currentPage` must be firstPage <= currentPage " +
- (firstPage ? ">" : ">=") +
- " totalPages if " + firstPage + "-based. Got " +
- currentPage + '.');
- }
- }
- return state;
- },
- /**
- Change the page size of this collection.
- Under most if not all circumstances, you should call this method to
- change the page size of a pageable collection because it will keep the
- pagination state sane. By default, the method will recalculate the
- current page number to one that will retain the current page's models
- when increasing the page size. When decreasing the page size, this method
- will retain the last models to the current page that will fit into the
- smaller page size.
- If `options.first` is true, changing the page size will also reset the
- current page back to the first page instead of trying to be smart.
- For server mode operations, changing the page size will trigger a #fetch
- and subsequently a `reset` event.
- For client mode operations, changing the page size will `reset` the
- current page by recalculating the current page boundary on the client
- side.
- If `options.fetch` is true, a fetch can be forced if the collection is in
- client mode.
- @param {number} pageSize The new page size to set to #state.
- @param {Object} [options] {@link #fetch} options.
- @param {boolean} [options.first=false] Reset the current page number to
- the first page if `true`.
- @param {boolean} [options.fetch] If `true`, force a fetch in client mode.
- @throws {TypeError} If `pageSize` is not a finite integer.
- @throws {RangeError} If `pageSize` is less than 1.
- @chainable
- @return {XMLHttpRequest|Backbone.PageableCollection} The XMLHttpRequest
- from fetch or this.
- */
- setPageSize: function (pageSize, options) {
- pageSize = finiteInt(pageSize, "pageSize");
- options = options || {first: false};
- var state = this.state;
- var totalPages = ceil(state.totalRecords / pageSize);
- var currentPage = totalPages ?
- max(state.firstPage, floor(totalPages * state.currentPage / state.totalPages)) :
- state.firstPage;
- state = this.state = this._checkState(_extend({}, state, {
- pageSize: pageSize,
- currentPage: options.first ? state.firstPage : currentPage,
- totalPages: totalPages
- }));
- return this.getPage(state.currentPage, _omit(options, ["first"]));
- },
- /**
- Switching between client, server and infinite mode.
- If switching from client to server mode, the #fullCollection is emptied
- first and then deleted and a fetch is immediately issued for the current
- page from the server. Pass `false` to `options.fetch` to skip fetching.
- If switching to infinite mode, and if `options.models` is given for an
- array of models, #links will be populated with a URL per page, using the
- default URL for this collection.
- If switching from server to client mode, all of the pages are immediately
- refetched. If you have too many pages, you can pass `false` to
- `options.fetch` to skip fetching.
- If switching to any mode from infinite mode, the #links will be deleted.
- @param {"server"|"client"|"infinite"} [mode] The mode to switch to.
- @param {Object} [options]
- @param {boolean} [options.fetch=true] If `false`, no fetching is done.
- @param {boolean} [options.resetState=true] If 'false', the state is not
- reset, but checked for sanity instead.
- @chainable
- @return {XMLHttpRequest|Backbone.PageableCollection} The XMLHttpRequest
- from fetch or this if `options.fetch` is `false`.
- */
- switchMode: function (mode, options) {
- if (!_contains(["server", "client", "infinite"], mode)) {
- throw new TypeError('`mode` must be one of "server", "client" or "infinite"');
- }
- options = options || {fetch: true, resetState: true};
- var state = this.state = options.resetState ?
- _clone(this._initState) :
- this._checkState(_extend({}, this.state));
- this.mode = mode;
- var self = this;
- var fullCollection = this.fullCollection;
- var handlers = this._handlers = this._handlers || {}, handler;
- if (mode != "server" && !fullCollection) {
- fullCollection = this._makeFullCollection(options.models || [], options);
- fullCollection.pageableCollection = this;
- this.fullCollection = fullCollection;
- var allHandler = this._makeCollectionEventHandler(this, fullCollection);
- _each(["add", "remove", "reset", "sort"], function (event) {
- handlers[event] = handler = _.bind(allHandler, {}, event);
- self.on(event, handler);
- fullCollection.on(event, handler);
- });
- fullCollection.comparator = this._fullComparator;
- }
- else if (mode == "server" && fullCollection) {
- _each(_keys(handlers), function (event) {
- handler = handlers[event];
- self.off(event, handler);
- fullCollection.off(event, handler);
- });
- delete this._handlers;
- this._fullComparator = fullCollection.comparator;
- delete this.fullCollection;
- }
- if (mode == "infinite") {
- var links = this.links = {};
- var firstPage = state.firstPage;
- var totalPages = ceil(state.totalRecords / state.pageSize);
- var lastPage = firstPage === 0 ? max(0, totalPages - 1) : totalPages || firstPage;
- for (var i = state.firstPage; i <= lastPage; i++) {
- links[i] = this.url;
- }
- }
- else if (this.links) delete this.links;
- return options.fetch ?
- this.fetch(_omit(options, "fetch", "resetState")) :
- this;
- },
- /**
- @return {boolean} `true` if this collection can page backward, `false`
- otherwise.
- */
- hasPreviousPage: function () {
- var state = this.state;
- var currentPage = state.currentPage;
- if (this.mode != "infinite") return currentPage > state.firstPage;
- return !!this.links[currentPage - 1];
- },
- /**
- Delegates to hasPreviousPage.
- */
- hasPrevious: function () {
- var msg = "hasPrevious has been deprecated, use hasPreviousPage instead";
- typeof console != 'undefined' && console.warn && console.warn(msg);
- return this.hasPreviousPage();
- },
- /**
- @return {boolean} `true` if this collection can page forward, `false`
- otherwise.
- */
- hasNextPage: function () {
- var state = this.state;
- var currentPage = this.state.currentPage;
- if (this.mode != "infinite") return currentPage < state.lastPage;
- return !!this.links[currentPage + 1];
- },
- /**
- Delegates to hasNextPage.
- */
- hasNext: function () {
- var msg = "hasNext has been deprecated, use hasNextPage instead";
- typeof console != 'undefined' && console.warn && console.warn(msg);
- return this.hasNextPage();
- },
- /**
- Fetch the first page in server mode, or reset the current page of this
- collection to the first page in client or infinite mode.
- @param {Object} options {@link #getPage} options.
- @chainable
- @return {XMLHttpRequest|Backbone.PageableCollection} The XMLHttpRequest
- from fetch or this.
- */
- getFirstPage: function (options) {
- return this.getPage("first", options);
- },
- /**
- Fetch the previous page in server mode, or reset the current page of this
- collection to the previous page in client or infinite mode.
- @param {Object} options {@link #getPage} options.
- @chainable
- @return {XMLHttpRequest|Backbone.PageableCollection} The XMLHttpRequest
- from fetch or this.
- */
- getPreviousPage: function (options) {
- return this.getPage("prev", options);
- },
- /**
- Fetch the next page in server mode, or reset the current page of this
- collection to the next page in client mode.
- @param {Object} options {@link #getPage} options.
- @chainable
- @return {XMLHttpRequest|Backbone.PageableCollection} The XMLHttpRequest
- from fetch or this.
- */
- getNextPage: function (options) {
- return this.getPage("next", options);
- },
- /**
- Fetch the last page in server mode, or reset the current page of this
- collection to the last page in client mode.
- @param {Object} options {@link #getPage} options.
- @chainable
- @return {XMLHttpRequest|Backbone.PageableCollection} The XMLHttpRequest
- from fetch or this.
- */
- getLastPage: function (options) {
- return this.getPage("last", options);
- },
- /**
- Given a page index, set #state.currentPage to that index. If this
- collection is in server mode, fetch the page using the updated state,
- otherwise, reset the current page of this collection to the page
- specified by `index` in client mode. If `options.fetch` is true, a fetch
- can be forced in client mode before resetting the current page. Under
- infinite mode, if the index is less than the current page, a reset is
- done as in client mode. If the index is greater than the current page
- number, a fetch is made with the results **appended** to #fullCollection.
- The current page will then be reset after fetching.
- @param {number|string} index The page index to go to, or the page name to
- look up from #links in infinite mode.
- @param {Object} [options] {@link #fetch} options or
- [reset](http://backbonejs.org/#Collection-reset) options for client mode
- when `options.fetch` is `false`.
- @param {boolean} [options.fetch=false] If true, force a {@link #fetch} in
- client mode.
- @throws {TypeError} If `index` is not a finite integer under server or
- client mode, or does not yield a URL from #links under infinite mode.
- @throws {RangeError} If `index` is out of bounds.
- @chainable
- @return {XMLHttpRequest|Backbone.PageableCollection} The XMLHttpRequest
- from fetch or this.
- */
- getPage: function (index, options) {
- var mode = this.mode, fullCollection = this.fullCollection;
- options = options || {fetch: false};
- var state = this.state,
- firstPage = state.firstPage,
- currentPage = state.currentPage,
- lastPage = state.lastPage,
- pageSize = state.pageSize;
- var pageNum = index;
- switch (index) {
- case "first": pageNum = firstPage; break;
- case "prev": pageNum = currentPage - 1; break;
- case "next": pageNum = currentPage + 1; break;
- case "last": pageNum = lastPage; break;
- default: pageNum = finiteInt(index, "index");
- }
- this.state = this._checkState(_extend({}, state, {currentPage: pageNum}));
- options.from = currentPage, options.to = pageNum;
- var pageStart = (firstPage === 0 ? pageNum : pageNum - 1) * pageSize;
- var pageModels = fullCollection && fullCollection.length ?
- fullCollection.models.slice(pageStart, pageStart + pageSize) :
- [];
- if ((mode == "client" || (mode == "infinite" && !_isEmpty(pageModels))) &&
- !options.fetch) {
- this.reset(pageModels, _omit(options, "fetch"));
- return this;
- }
- if (mode == "infinite") options.url = this.links[pageNum];
- return this.fetch(_omit(options, "fetch"));
- },
- /**
- Fetch the page for the provided item offset in server mode, or reset the current page of this
- collection to the page for the provided item offset in client mode.
- @param {Object} options {@link #getPage} options.
- @chainable
- @return {XMLHttpRequest|Backbone.PageableCollection} The XMLHttpRequest
- from fetch or this.
- */
- getPageByOffset: function (offset, options) {
- if (offset < 0) {
- throw new RangeError("`offset must be > 0`");
- }
- offset = finiteInt(offset);
- var page = floor(offset / this.state.pageSize);
- if (this.state.firstPage !== 0) page++;
- if (page > this.state.lastPage) page = this.state.lastPage;
- return this.getPage(page, options);
- },
- /**
- Overidden to make `getPage` compatible with Zepto.
- @param {string} method
- @param {Backbone.Model|Backbone.Collection} model
- @param {Object} [options]
- @return {XMLHttpRequest}
- */
- sync: function (method, model, options) {
- var self = this;
- if (self.mode == "infinite") {
- var success = options.success;
- var currentPage = self.state.currentPage;
- options.success = function (resp, status, xhr) {
- var links = self.links;
- var newLinks = self.parseLinks(resp, _extend({xhr: xhr}, options));
- if (newLinks.first) links[self.state.firstPage] = newLinks.first;
- if (newLinks.prev) links[currentPage - 1] = newLinks.prev;
- if (newLinks.next) links[currentPage + 1] = newLinks.next;
- if (success) success(resp, status, xhr);
- };
- }
- return (BBColProto.sync || Backbone.sync).call(self, method, model, options);
- },
- /**
- Parse pagination links from the server response. Only valid under
- infinite mode.
- Given a response body and a XMLHttpRequest object, extract pagination
- links from them for infinite paging.
- This default implementation parses the RFC 5988 `Link` header and extract
- 3 links from it - `first`, `prev`, `next`. Any subclasses overriding this
- method __must__ return an object hash having only the keys
- above. However, simply returning a `next` link or an empty hash if there
- are no more links should be enough for most implementations.
- @param {*} resp The deserialized response body.
- @param {Object} [options]
- @param {XMLHttpRequest} [options.xhr] The XMLHttpRequest object for this
- response.
- @return {Object}
- */
- parseLinks: function (resp, options) {
- var links = {};
- var linkHeader = options.xhr.getResponseHeader("Link");
- if (linkHeader) {
- var relations = ["first", "prev", "next"];
- _each(linkHeader.split(","), function (linkValue) {
- var linkParts = linkValue.split(";");
- var url = linkParts[0].replace(URL_TRIM_RE, '');
- var params = linkParts.slice(1);
- _each(params, function (param) {
- var paramParts = param.split("=");
- var key = paramParts[0].replace(PARAM_TRIM_RE, '');
- var value = paramParts[1].replace(PARAM_TRIM_RE, '');
- if (key == "rel" && _contains(relations, value)) links[value] = url;
- });
- });
- }
- return links;
- },
- /**
- Parse server response data.
- This default implementation assumes the response data is in one of two
- structures:
- [
- {}, // Your new pagination state
- [{}, ...] // An array of JSON objects
- ]
- Or,
- [{}] // An array of JSON objects
- The first structure is the preferred form because the pagination states
- may have been updated on the server side, sending them down again allows
- this collection to update its states. If the response has a pagination
- state object, it is checked for errors.
- The second structure is the
- [Backbone.Collection#parse](http://backbonejs.org/#Collection-parse)
- default.
- **Note:** this method has been further simplified since 1.1.7. While
- existing #parse implementations will continue to work, new code is
- encouraged to override #parseState and #parseRecords instead.
- @param {Object} resp The deserialized response data from the server.
- @param {Object} the options for the ajax request
- @return {Array.<Object>} An array of model objects
- */
- parse: function (resp, options) {
- var newState = this.parseState(resp, _clone(this.queryParams), _clone(this.state), options);
- if (newState) this.state = this._checkState(_extend({}, this.state, newState));
- return this.parseRecords(resp, options);
- },
- /**
- Parse server response for server pagination state updates. Not applicable
- under infinite mode.
- This default implementation first checks whether the response has any
- state object as documented in #parse. If it exists, a state object is
- returned by mapping the server state keys to this pageable collection
- instance's query parameter keys using `queryParams`.
- It is __NOT__ neccessary to return a full state object complete with all
- the mappings defined in #queryParams. Any state object resulted is merged
- with a copy of the current pageable collection state and checked for
- sanity before actually updating. Most of the time, simply providing a new
- `totalRecords` value is enough to trigger a full pagination state
- recalculation.
- parseState: function (resp, queryParams, state, options) {
- return {totalRecords: resp.total_entries};
- }
- If you want to use header fields use:
- parseState: function (resp, queryParams, state, options) {
- return {totalRecords: options.xhr.getResponseHeader("X-total")};
- }
- This method __MUST__ return a new state object instead of directly
- modifying the #state object. The behavior of directly modifying #state is
- undefined.
- @param {Object} resp The deserialized response data from the server.
- @param {Object} queryParams A copy of #queryParams.
- @param {Object} state A copy of #state.
- @param {Object} [options] The options passed through from
- `parse`. (backbone >= 0.9.10 only)
- @return {Object} A new (partial) state object.
- */
- parseState: function (resp, queryParams, state, options) {
- if (resp && resp.length === 2 && _isObject(resp[0]) && _isArray(resp[1])) {
- var newState = _clone(state);
- var serverState = resp[0];
- _each(_pairs(_omit(queryParams, "directions")), function (kvp) {
- var k = kvp[0], v = kvp[1];
- var serverVal = serverState[v];
- if (!_isUndefined(serverVal) && !_.isNull(serverVal)) newState[k] = serverState[v];
- });
- if (serverState.order) {
- newState.order = _invert(queryParams.directions)[serverState.order] * 1;
- }
- return newState;
- }
- },
- /**
- Parse server response for an array of model objects.
- This default implementation first checks whether the response has any
- state object as documented in #parse. If it exists, the array of model
- objects is assumed to be the second element, otherwise the entire
- response is returned directly.
- @param {Object} resp The deserialized response data from the server.
- @param {Object} [options] The options passed through from the
- `parse`. (backbone >= 0.9.10 only)
- @return {Array.<Object>} An array of model objects
- */
- parseRecords: function (resp, options) {
- if (resp && resp.length === 2 && _isObject(resp[0]) && _isArray(resp[1])) {
- return resp[1];
- }
- return resp;
- },
- /**
- Fetch a page from the server in server mode, or all the pages in client
- mode. Under infinite mode, the current page is refetched by default and
- then reset.
- The query string is constructed by translating the current pagination
- state to your server API query parameter using #queryParams. The current
- page will reset after fetch.
- @param {Object} [options] Accepts all
- [Backbone.Collection#fetch](http://backbonejs.org/#Collection-fetch)
- options.
- @return {XMLHttpRequest}
- */
- fetch: function (options) {
- options = options || {};
- var state = this._checkState(this.state);
- var mode = this.mode;
- if (mode == "infinite" && !options.url) {
- options.url = this.links[state.currentPage];
- }
- var data = options.data || {};
- // dedup query params
- var url = _result(options, "url") || _result(this, "url") || '';
- var qsi = url.indexOf('?');
- if (qsi != -1) {
- _extend(data, queryStringToParams(url.slice(qsi + 1)));
- url = url.slice(0, qsi);
- }
- options.url = url;
- options.data = data;
- // map params except directions
- var queryParams = this.mode == "client" ?
- _pick(this.queryParams, "sortKey", "order") :
- _omit(_pick(this.queryParams, _keys(PageableProto.queryParams)),
- "directions");
- var i, kvp, k, v, kvps = _pairs(queryParams), thisCopy = _clone(this);
- for (i = 0; i < kvps.length; i++) {
- kvp = kvps[i], k = kvp[0], v = kvp[1];
- v = _isFunction(v) ? v.call(thisCopy) : v;
- if (state[k] != null && v != null) {
- data[v] = state[k];
- }
- }
- // fix up sorting parameters
- if (state.sortKey && state.order) {
- data[queryParams.order] = this.queryParams.directions[state.order + ""];
- }
- else if (!state.sortKey) delete data[queryParams.order];
- // map extra query parameters
- var extraKvps = _pairs(_omit(this.queryParams,
- _keys(PageableProto.queryParams)));
- for (i = 0; i < extraKvps.length; i++) {
- kvp = extraKvps[i];
- v = kvp[1];
- v = _isFunction(v) ? v.call(thisCopy) : v;
- if (v != null) data[kvp[0]] = v;
- }
- if (mode != "server") {
- var self = this, fullCol = this.fullCollection;
- var success = options.success;
- options.success = function (col, resp, opts) {
- // make sure the caller's intent is obeyed
- opts = opts || {};
- if (_isUndefined(options.silent)) delete opts.silent;
- else opts.silent = options.silent;
- var models = col.models;
- if (mode == "client") fullCol.reset(models, opts);
- else {
- fullCol.add(models, _extend({at: fullCol.length},
- _extend(opts, {parse: false})));
- self.trigger("reset", self, opts);
- }
- if (success) success(col, resp, opts);
- };
- // silent the first reset from backbone
- return BBColProto.fetch.call(this, _extend({}, options, {silent: true}));
- }
- return BBColProto.fetch.call(this, options);
- },
- /**
- Convenient method for making a `comparator` sorted by a model attribute
- identified by `sortKey` and ordered by `order`.
- Like a Backbone.Collection, a Backbone.PageableCollection will maintain
- the __current page__ in sorted order on the client side if a `comparator`
- is attached to it. If the collection is in client mode, you can attach a
- comparator to #fullCollection to have all the pages reflect the global
- sorting order by specifying an option `full` to `true`. You __must__ call
- `sort` manually or #fullCollection.sort after calling this method to
- force a resort.
- While you can use this method to sort the current page in server mode,
- the sorting order may not reflect the global sorting order due to the
- additions or removals of the records on the server since the last
- fetch. If you want the most updated page in a global sorting order, it is
- recommended that you set #state.sortKey and optionally #state.order, and
- then call #fetch.
- @protected
- @param {string} [sortKey=this.state.sortKey] See `state.sortKey`.
- @param {number} [order=this.state.order] See `state.order`.
- @param {(function(Backbone.Model, string): Object) | string} [sortValue] See #setSorting.
- See [Backbone.Collection.comparator](http://backbonejs.org/#Collection-comparator).
- */
- _makeComparator: function (sortKey, order, sortValue) {
- var state = this.state;
- sortKey = sortKey || state.sortKey;
- order = order || state.order;
- if (!sortKey || !order) return;
- if (!sortValue) sortValue = function (model, attr) {
- return model.get(attr);
- };
- return function (left, right) {
- var l = sortValue(left, sortKey), r = sortValue(right, sortKey), t;
- if (order === 1) t = l, l = r, r = t;
- if (l === r) return 0;
- else if (l < r) return -1;
- return 1;
- };
- },
- /**
- Adjusts the sorting for this pageable collection.
- Given a `sortKey` and an `order`, sets `state.sortKey` and
- `state.order`. A comparator can be applied on the client side to sort in
- the order defined if `options.side` is `"client"`. By default the
- comparator is applied to the #fullCollection. Set `options.full` to
- `false` to apply a comparator to the current page under any mode. Setting
- `sortKey` to `null` removes the comparator from both the current page and
- the full collection.
- If a `sortValue` function is given, it will be passed the `(model,
- sortKey)` arguments and is used to extract a value from the model during
- comparison sorts. If `sortValue` is not given, `model.get(sortKey)` is
- used for sorting.
- @chainable
- @param {string} sortKey See `state.sortKey`.
- @param {number} [order=this.state.order] See `state.order`.
- @param {Object} [options]
- @param {"server"|"client"} [options.side] By default, `"client"` if
- `mode` is `"client"`, `"server"` otherwise.
- @param {boolean} [options.full=true]
- @param {(function(Backbone.Model, string): Object) | string} [options.sortValue]
- */
- setSorting: function (sortKey, order, options) {
- var state = this.state;
- state.sortKey = sortKey;
- state.order = order = order || state.order;
- var fullCollection = this.fullCollection;
- var delComp = false, delFullComp = false;
- if (!sortKey) delComp = delFullComp = true;
- var mode = this.mode;
- options = _extend({side: mode == "client" ? mode : "server", full: true},
- options);
- var comparator = this._makeComparator(sortKey, order, options.sortValue);
- var full = options.full, side = options.side;
- if (side == "client") {
- if (full) {
- if (fullCollection) fullCollection.comparator = comparator;
- delComp = true;
- }
- else {
- this.comparator = comparator;
- delFullComp = true;
- }
- }
- else if (side == "server" && !full) {
- this.comparator = comparator;
- }
- if (delComp) this.comparator = null;
- if (delFullComp && fullCollection) fullCollection.comparator = null;
- return this;
- }
- });
- var PageableProto = PageableCollection.prototype;
- return PageableCollection;
- }));