/web-app/lib/backgrid/backgrid-paginator.js
JavaScript | 201 lines | 122 code | 31 blank | 48 comment | 15 complexity | bdebdd719035688b297add3a23e8bf37 MD5 | raw file
Possible License(s): Apache-2.0, BSD-3-Clause
- /*
- backgrid-paginator
- http://github.com/wyuenho/backgrid
- Copyright (c) 2013 Jimmy Yuen Ho Wong
- Licensed under the MIT @license.
- */
- (function ($, _, Backbone, Backgrid) {
- "use strict";
- /**
- Paginator is a Footer element that re-renders a large result set in a table
- by splitting it across multiple pages. If the result set is still larger,
- the page handles are rendered within a sliding window, with 10 indexed page
- handles each by default, plus the fast forward, fast backward, previous and
- next page handles. The fast forward, fast backward, previous and next page
- handles can be turned off.
- @class Backgrid.Extension.Paginator
- */
- Backgrid.Extension.Paginator = Backgrid.Footer.extend({
- /** @property */
- className: "paginator",
- /** @property */
- windowSize: 10,
- /** @property */
- fastForwardHandleLabels: {
- first: "《",
- prev: "〈",
- next: "〉",
- last: "》"
- },
- /** @property */
- template: _.template('<tr><td colspan="<%= colspan %>"><ul><% _.each(handles, function (handle) { %><li <% if (handle.className) { %>class="<%= handle.className %>"<% } %>><a href="#" <% if (handle.title) {%> title="<%= handle.title %>"<% } %>><%= handle.label %></a></li><% }); %></ul></td></tr>'),
- /** @property */
- events: {
- "click a": "changePage"
- },
- /**
- Initializer.
- @param {Object} options
- @param {Backbone.Collection.<Backgrid.Column>|Array.<Backgrid.Column>|Array.<Object>} options.columns
- Column metadata.
- @param {Backbone.Collection} options.collection
- @param {boolean} [options.fastForwardHandleLabels] Whether to render fast forward buttons.
- */
- initialize: function (options) {
- Backgrid.Footer.prototype.initialize.call(this, options);
- var columns = this.columns;
- this.listenTo(columns, "add", this.render);
- this.listenTo(columns, "remove", this.render);
- this.listenTo(columns, "change:renderable", this.render);
- var collection = this.collection;
- var fullCollection = collection.fullCollection;
- if (fullCollection) {
- this.listenTo(fullCollection, "add", this.render);
- this.listenTo(fullCollection, "remove", this.render);
- this.listenTo(fullCollection, "reset", this.render);
- }
- else {
- this.listenTo(collection, "add", this.render);
- this.listenTo(collection, "remove", this.render);
- this.listenTo(collection, "reset", this.render);
- }
- },
- /**
- jQuery event handler for the page handlers. Goes to the right page upon
- clicking.
- @param {Event} e
- */
- changePage: function (e) {
- e.preventDefault();
- var label = $(e.target).text();
- var ffLabels = this.fastForwardHandleLabels;
- var collection = this.collection;
- if (ffLabels) {
- switch (label) {
- case ffLabels.first:
- collection.getFirstPage();
- return;
- case ffLabels.prev:
- if (collection.hasPrevious()) collection.getPreviousPage();
- return;
- case ffLabels.next:
- if (collection.hasNext()) collection.getNextPage();
- return;
- case ffLabels.last:
- collection.getLastPage();
- return;
- }
- }
- var state = collection.state;
- var pageIndex = $(e.target).text() * 1 - state.firstPage;
- collection.getPage(state.firstPage === 0 ? pageIndex : pageIndex + 1);
- },
- /**
- Internal method to create a list of page handle objects for the template
- to render them.
- @return Array.<Object> an array of page handle objects hashes
- */
- makeHandles: function () {
- var handles = [];
- var collection = this.collection;
- var state = collection.state;
- // convert all indices to 0-based here
- var lastPage = state.lastPage ? state.lastPage : state.firstPage;
- lastPage = state.firstPage === 0 ? lastPage : lastPage - 1;
- var currentPage = state.firstPage === 0 ? state.currentPage : state.currentPage - 1;
- var windowStart = Math.floor(currentPage / this.windowSize) * this.windowSize;
- var windowEnd = windowStart + this.windowSize;
- windowEnd = windowEnd <= lastPage ? windowEnd : lastPage + 1;
- if (collection.mode !== "infinite") {
- for (var i = windowStart; i < windowEnd; i++) {
- handles.push({
- label: i + 1,
- title: "No. " + (i + 1),
- className: currentPage === i ? "active" : undefined
- });
- }
- }
- var ffLabels = this.fastForwardHandleLabels;
- if (ffLabels) {
- if (ffLabels.prev) {
- handles.unshift({
- label: ffLabels.prev,
- className: collection.hasPrevious() ? void 0 : "disabled"
- });
- }
- if (ffLabels.first) {
- handles.unshift({
- label: ffLabels.first,
- className: collection.hasPrevious() ? void 0 : "disabled"
- });
- }
- if (ffLabels.next) {
- handles.push({
- label: ffLabels.next,
- className: collection.hasNext() ? void 0 : "disabled"
- });
- }
- if (ffLabels.last) {
- handles.push({
- label: ffLabels.last,
- className: collection.hasNext() ? void 0 : "disabled"
- });
- }
- }
- return handles;
- },
- /**
- Render the paginator handles inside an unordered list placed inside a
- cell that spans all the columns.
- */
- render: function () {
- this.$el.empty();
- var colspan = _.reduce(
- this.columns.pluck("renderable"),
- function (accum, renderable) {
- return renderable ? accum + 1 : accum;
- }, 0);
- this.$el.append($(this.template({
- colspan: colspan,
- handles: this.makeHandles()
- })));
- return this;
- }
- });
- }(jQuery, _, Backbone, Backgrid));