--- /dev/null
+/**
+ * Endless Scroll plugin for jQuery
+ *
+ * v1.4.8
+ *
+ * Copyright (c) 2008 Fred Wu
+ *
+ * Dual licensed under the MIT and GPL licenses:
+ * http://www.opensource.org/licenses/mit-license.php
+ * http://www.gnu.org/licenses/gpl.html
+ */
+
+/**
+ * Usage:
+ *
+ * // using default options
+ * $(document).endlessScroll();
+ *
+ * // using some custom options
+ * $(document).endlessScroll({
+ * fireOnce: false,
+ * fireDelay: false,
+ * loader: "<div class=\"loading\"><div>",
+ * callback: function(){
+ * alert("test");
+ * }
+ * });
+ *
+ * Configuration options:
+ *
+ * bottomPixels integer the number of pixels from the bottom of the page that triggers the event
+ * fireOnce boolean only fire once until the execution of the current event is completed
+ * fireDelay integer delay the subsequent firing, in milliseconds, 0 or false to disable delay
+ * loader string the HTML to be displayed during loading
+ * data string|function plain HTML data, can be either a string or a function that returns a string,
+ * when passed as a function it accepts one argument: fire sequence (the number
+ * of times the event triggered during the current page session)
+ * insertAfter string jQuery selector syntax: where to put the loader as well as the plain HTML data
+ * callback function callback function, accepts one argument: fire sequence (the number of times
+ * the event triggered during the current page session)
+ * resetCounter function resets the fire sequence counter if the function returns true, this function
+ * could also perform hook actions since it is applied at the start of the event
+ * ceaseFire function stops the event (no more endless scrolling) if the function returns true
+ *
+ * Usage tips:
+ *
+ * The plugin is more useful when used with the callback function, which can then make AJAX calls to retrieve content.
+ * The fire sequence argument (for the callback function) is useful for 'pagination'-like features.
+ */
+
+(function($){
+
+ $.fn.endlessScroll = function(options) {
+
+ var defaults = {
+ bottomPixels : 50,
+ fireOnce : true,
+ fireDelay : 150,
+ loader : "<br />Loading...<br />",
+ data : "",
+ insertAfter : "div:last",
+ resetCounter : function() { return false; },
+ callback : function() { return true; },
+ ceaseFire : function() { return false; }
+ };
+
+ var options = $.extend({}, defaults, options),
+ firing = true,
+ fired = false,
+ fireSequence = 0,
+ is_scrollable;
+
+ if (options.ceaseFire.apply(this) === true)
+ firing = false;
+
+ if (firing === true) {
+ $(this).scroll(function() {
+ if (options.ceaseFire.apply(this) === true) {
+ firing = false;
+ return; // Scroll will still get called, but nothing will happen
+ }
+
+ if (this == document || this == window) {
+ is_scrollable = $(document).height() - $(window).height() <= $(window).scrollTop() + options.bottomPixels;
+ } else {
+ // calculates the actual height of the scrolling container
+ var inner_wrap = $(".endless_scroll_inner_wrap", this);
+ if (inner_wrap.length == 0)
+ inner_wrap = $(this).wrapInner("<div class=\"endless_scroll_inner_wrap\" />").find(".endless_scroll_inner_wrap");
+ is_scrollable = inner_wrap.length > 0 &&
+ (inner_wrap.height() - $(this).height() <= $(this).scrollTop() + options.bottomPixels);
+ }
+
+ if (is_scrollable && (options.fireOnce == false || (options.fireOnce == true && fired != true))) {
+ if (options.resetCounter.apply(this) === true) fireSequence = 0;
+
+ fired = true;
+ fireSequence++;
+
+ $(options.insertAfter).after("<div id=\"endless_scroll_loader\">" + options.loader + "</div>");
+
+ data = typeof options.data == 'function' ? options.data.apply(this, [fireSequence]) : options.data;
+
+ if (data !== false) {
+ $(options.insertAfter).after("<div id=\"endless_scroll_data\">" + data + "</div>");
+ $("#endless_scroll_data").hide().fadeIn(250, function() {$(this).removeAttr("id");});
+
+ options.callback.apply(this, [fireSequence]);
+
+ if (options.fireDelay !== false || options.fireDelay !== 0) {
+ $("body").after("<div id=\"endless_scroll_marker\"></div>");
+ // slight delay for preventing event firing twice
+ $("#endless_scroll_marker").fadeTo(options.fireDelay, 1, function() {
+ $(this).remove();
+ fired = false;
+ });
+ }
+ else
+ fired = false;
+ }
+
+ $("#endless_scroll_loader").remove();
+ }
+ });
+ }
+ };
+
+})(jQuery);
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