/*!
// Infinite Scroll jQuery plugin
// copyright Paul Irish, licensed GPL & MIT
// version 1.2.090804
// home and docs: http://www.infinite-scroll.com
*/
// todo: add preloading option.
;(function($){
$.fn.infinitescroll = function(options,callback){
// console log wrapper.
function debug(){
if (opts.debug) { window.console && console.log.call(console,arguments)}
}
// grab each selector option and see if any fail.
function areSelectorsValid(opts){
for (var key in opts){
if (key.indexOf && (key.indexOf('Selector') != -1) && $(opts[key]).length === 0){
debug('Your ' + key + ' found no elements.');
return false;
}
return true;
}
}
// find the number to increment in the path.
function determinePath(path){
path.match(relurl) ? path.match(relurl)[2] : path;
// there is a 2 in the url surrounded by slashes, e.g. /page/2/
if ( path.match(/^(.*?)\b2\b(.*?$)/) ){
path = path.match(/^(.*?)\b2\b(.*?$)/).slice(1);
} else
// if there is any 2 in the url at all.
if (path.match(/^(.*?)2(.*?$)/)){
debug('Trying backup next selector parse technique. Treacherous waters here, matey.');
path = path.match(/^(.*?)2(.*?$)/).slice(1);
} else {
debug('Sorry, we couldn\'t parse your Next (Previous Posts) URL. Verify your the css selector points to the correct A tag. If you still get this error: yell, scream, and kindly ask for help at infinite-scroll.com.');
props.isInvalidPage = true; //prevent it from running on this page.
}
return path;
}
// 'document' means the full document usually, but sometimes the content of the overflow'd div in local mode
function getDocumentHeight(){
// weird doubletouch of scrollheight because http://soulpass.com/2006/07/24/ie-and-scrollheight/
return opts.localMode ? ($(props.container)[0].scrollHeight && $(props.container)[0].scrollHeight)
// needs to be document's height. (not props.container's) html's height is wrong in IE.
: $(document).height()
}
function isNearBottom(opts,props){
// distance remaining in the scroll
// computed as: document height - distance already scroll - viewport height - buffer
var pixelsFromWindowBottomToBottom = getDocumentHeight() -
(opts.localMode ? $(props.container).scrollTop() :
// have to do this bs because safari doesnt report a scrollTop on the html element
($(props.container).scrollTop() || $(props.container.ownerDocument.body).scrollTop())) -
$(opts.localMode ? props.container : window).height();
debug('math:',pixelsFromWindowBottomToBottom, props.pixelsFromNavToBottom);
// if distance remaining in the scroll (including buffer) is less than the orignal nav to bottom....
return (pixelsFromWindowBottomToBottom - opts.bufferPx < props.pixelsFromNavToBottom);
}
function showDoneMsg(){
props.loadingMsg
.find('img').hide()
.parent()
.find('div').html(opts.donetext).animate({opacity: 1},2000).fadeOut('normal');
// user provided callback when done
opts.errorCallback();
}
function infscrSetup(path,opts,props,callback){
if (props.isDuringAjax || props.isInvalidPage || props.isDone) return;
if ( opts.infiniteScroll && !isNearBottom(opts,props) ) return;
// we dont want to fire the ajax multiple times
props.isDuringAjax = true;
// show the loading message and hide the previous/next links
props.loadingMsg.appendTo( opts.contentSelector ).show();
if(opts.infiniteScroll) $( opts.navSelector ).hide();
// increment the URL bit. e.g. /page/3/
props.currPage++;
debug('heading into ajax',path);
// if we're dealing with a table we can't use DIVs
var box = $(opts.contentSelector).is('table') ? $('') : $('');
box
.attr('id','infscr-page-'+props.currPage)
.addClass('infscr-pages')
.appendTo( opts.contentSelector )
.load( path.join( props.currPage ) + ' ' + opts.itemSelector,null,function(){
// if we've hit the last page...
if (props.isDone){
showDoneMsg();
return false;
} else {
// if it didn't return anything
if (box.children().length == 0){
// fake an ajaxError so we can quit.
$.event.trigger( "ajaxError", [{status:404}] );
}
// fadeout currently makes the 'd text ugly in IE6
props.loadingMsg.fadeOut('normal' );
// smooth scroll to ease in the new content
if (opts.animate){
var scrollTo = $(window).scrollTop() + $('#infscr-loading').height() + opts.extraScrollPx + 'px';
$('html,body').animate({scrollTop: scrollTo}, 800,function(){ props.isDuringAjax = false; });
}
// pass in the new DOM element as context for the callback
callback.call( box[0] );
if (!opts.animate) props.isDuringAjax = false; // once the call is done, we can allow it again.
}
}); // end of load()
} // end of infscrSetup()
// lets get started.
var opts = $.extend({}, $.infinitescroll.defaults, options);
var props = $.infinitescroll; // shorthand
callback = callback || function(){};
if (!areSelectorsValid(opts)){ return false; }
// we doing this on an overflow:auto div?
props.container = opts.localMode ? this : document.documentElement;
// contentSelector we'll use for our .load()
opts.contentSelector = opts.contentSelector || this;
// get the relative URL - everything past the domain name.
var relurl = /(.*?\/\/).*?(\/.*)/;
var path = $(opts.nextSelector).attr('href');
if (!path) { debug('Navigation selector not found'); return; }
// set the path to be a relative URL from root.
path = determinePath(path);
// reset scrollTop in case of page refresh:
if (opts.localMode) $(props.container)[0].scrollTop = 0;
// distance from nav links to bottom
// computed as: height of the document + top offset of container - top offset of nav link
props.pixelsFromNavToBottom = getDocumentHeight() +
$(props.container).offset().top -
$(opts.navSelector).offset().top;
// define loading msg
props.loadingMsg = $('
'+opts.loadingText+'