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Add Infinite Scroll in Browse
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24 changed files with 494 additions and 85 deletions
209
modules/jscroll/jquery.jscroll.js
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209
modules/jscroll/jquery.jscroll.js
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/*!
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* jScroll - jQuery Plugin for Infinite Scrolling / Auto-Paging - v2.2.4
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* http://jscroll.com/
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*
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* Copyright 2011-2013, Philip Klauzinski
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* http://klauzinski.com/
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* Dual licensed under the MIT and GPL Version 2 licenses.
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* http://jscroll.com/#license
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* http://www.opensource.org/licenses/mit-license.php
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* http://www.gnu.org/licenses/gpl-2.0.html
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*
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* @author Philip Klauzinski
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* @requires jQuery v1.4.3+
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*/
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(function($) {
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// Define the jscroll namespace and default settings
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$.jscroll = {
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defaults: {
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debug: false,
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autoTrigger: true,
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autoTriggerUntil: false,
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loadingHtml: '<small>Loading...</small>',
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padding: 0,
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nextSelector: 'a:last',
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contentSelector: '',
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pagingSelector: '',
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callback: false
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}
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};
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// Constructor
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var jScroll = function($e, options) {
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// Private vars
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var _data = $e.data('jscroll'),
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_userOptions = (typeof options === 'function') ? { callback: options } : options,
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_options = $.extend({}, $.jscroll.defaults, _userOptions, _data || {}),
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_isWindow = ($e.css('overflow-y') === 'visible'),
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_$next = $e.find(_options.nextSelector).first(),
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_$window = $(window),
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_$body = $('body'),
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_$scroll = _isWindow ? _$window : $e,
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_nextHref = $.trim(_$next.attr('href') + ' ' + _options.contentSelector);
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// Initialization
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$e.data('jscroll', $.extend({}, _data, {initialized: true, waiting: false, nextHref: _nextHref}));
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_wrapInnerContent();
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_preloadImage();
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_setBindings();
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// Private methods
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// Check if a loading image is defined and preload
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function _preloadImage() {
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var src = $(_options.loadingHtml).filter('img').attr('src');
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if (src) {
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var image = new Image();
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image.src = src;
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}
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}
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// Wrapper inner content, if it isn't already
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function _wrapInnerContent() {
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if (!$e.find('.jscroll-inner').length) {
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$e.contents().wrapAll('<div class="jscroll-inner" />');
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}
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}
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// Find the next link's parent, or add one, and hide it
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function _nextWrap($next) {
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if (_options.pagingSelector) {
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var $parent = $next.closest(_options.pagingSelector).hide();
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} else {
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var $parent = $next.parent().not('.jscroll-inner,.jscroll-added').addClass('jscroll-next-parent').hide();
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if (!$parent.length) {
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$next.wrap('<div class="jscroll-next-parent" />').parent().hide();
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}
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}
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}
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// Remove the jscroll behavior and data from an element
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function _destroy() {
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return _$scroll.unbind('.jscroll')
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.removeData('jscroll')
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.find('.jscroll-inner').children().unwrap()
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.filter('.jscroll-added').children().unwrap();
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}
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// Observe the scroll event for when to trigger the next load
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function _observe() {
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_wrapInnerContent();
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var $inner = $e.find('div.jscroll-inner').first(),
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data = $e.data('jscroll'),
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borderTopWidth = parseInt($e.css('borderTopWidth')),
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borderTopWidthInt = isNaN(borderTopWidth) ? 0 : borderTopWidth,
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iContainerTop = parseInt($e.css('paddingTop')) + borderTopWidthInt,
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iTopHeight = _isWindow ? _$scroll.scrollTop() : $e.offset().top,
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innerTop = $inner.length ? $inner.offset().top : 0,
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iTotalHeight = Math.ceil(iTopHeight - innerTop + _$scroll.height() + iContainerTop);
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if (!data.waiting && iTotalHeight + _options.padding >= $inner.outerHeight()) {
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//data.nextHref = $.trim(data.nextHref + ' ' + _options.contentSelector);
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_debug('info', 'jScroll:', $inner.outerHeight() - iTotalHeight, 'from bottom. Loading next request...');
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return _load();
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}
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}
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// Check if the href for the next set of content has been set
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function _checkNextHref(data) {
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data = data || $e.data('jscroll');
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if (!data || !data.nextHref) {
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_debug('warn', 'jScroll: nextSelector not found - destroying');
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_destroy();
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return false;
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} else {
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_setBindings();
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return true;
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}
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}
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function _setBindings() {
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var $next = $e.find(_options.nextSelector).first();
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if (_options.autoTrigger && (_options.autoTriggerUntil === false || _options.autoTriggerUntil > 0)) {
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_nextWrap($next);
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if (_$body.height() <= _$window.height()) {
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_observe();
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}
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_$scroll.unbind('.jscroll').bind('scroll.jscroll', function() {
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return _observe();
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});
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if (_options.autoTriggerUntil > 0) {
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_options.autoTriggerUntil--;
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}
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} else {
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_$scroll.unbind('.jscroll');
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$next.bind('click.jscroll', function() {
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_nextWrap($next);
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_load();
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return false;
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});
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}
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}
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// Load the next set of content, if available
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function _load() {
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var $inner = $e.find('div.jscroll-inner').first(),
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data = $e.data('jscroll');
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data.waiting = true;
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$inner.append('<div class="jscroll-added" />')
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.children('.jscroll-added').last()
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.html('<div class="jscroll-loading">' + _options.loadingHtml + '</div>');
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return $e.animate({scrollTop: $inner.outerHeight()}, 0, function() {
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$inner.find('div.jscroll-added').last().load(data.nextHref, function(r, status, xhr) {
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if (status === 'error') {
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return _destroy();
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}
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var $next = $(this).find(_options.nextSelector).first();
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data.waiting = false;
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data.nextHref = $next.attr('href') ? $.trim($next.attr('href') + ' ' + _options.contentSelector) : false;
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$('.jscroll-next-parent', $e).remove(); // Remove the previous next link now that we have a new one
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_checkNextHref();
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if (_options.callback) {
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_options.callback.call(this);
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}
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_debug('dir', data);
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});
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});
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}
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// Safe console debug - http://klauzinski.com/javascript/safe-firebug-console-in-javascript
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function _debug(m) {
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if (_options.debug && typeof console === 'object' && (typeof m === 'object' || typeof console[m] === 'function')) {
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if (typeof m === 'object') {
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var args = [];
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for (var sMethod in m) {
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if (typeof console[sMethod] === 'function') {
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args = (m[sMethod].length) ? m[sMethod] : [m[sMethod]];
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console[sMethod].apply(console, args);
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} else {
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console.log.apply(console, args);
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}
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}
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} else {
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console[m].apply(console, Array.prototype.slice.call(arguments, 1));
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}
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}
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}
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// Expose API methods via the jQuery.jscroll namespace, e.g. $('sel').jscroll.method()
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$.extend($e.jscroll, {
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destroy: _destroy
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});
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return $e;
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};
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// Define the jscroll plugin method and loop
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$.fn.jscroll = function(m) {
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return this.each(function() {
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var $this = $(this),
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data = $this.data('jscroll');
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// Instantiate jScroll on this element if it hasn't been already
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if (data && data.initialized) return;
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var jscroll = new jScroll($this, m);
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});
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};
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})(jQuery);
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