/*! // 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') ? $('<tbody/>') : $('<div/>'); 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 <em>'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 = $('<div id="infscr-loading" style="text-align: center;"><img alt="Loading..." src="'+ opts.loadingImg+'" /><div>'+opts.loadingText+'</div></div>'); // preload the image (new Image()).src = opts.loadingImg; // set up our bindings $(document).ajaxError(function(e,xhr,opt){ debug('Page not found. Self-destructing...'); // die if we're out of pages. if (xhr.status == 404){ showDoneMsg(); props.isDone = true; $(opts.localMode ? this : window).unbind('scroll.infscr'); } }); if(opts.infiniteScroll){ // bind scroll handler to element (if its a local scroll) or window $(opts.localMode ? this : window) .bind('scroll.infscr', function(){ infscrSetup(path,opts,props,callback); } ) .trigger('scroll.infscr'); // trigger the event, in case it's a short page }else{ $(opts.nextSelector).click( function(){ infscrSetup(path,opts,props,callback); return false; } ); } return this; } // end of $.fn.infinitescroll() // options and read-only properties object $.infinitescroll = { defaults : { debug : false, infiniteScroll : true, preload : false, nextSelector : "div.navigation a:first", loadingImg : "http://www.infinite-scroll.com/loading.gif", loadingText : "<em>Loading the next set of posts...</em>", donetext : "<em>Congratulations, you've reached the end of the internet.</em>", navSelector : "div.navigation", contentSelector : null, // not really a selector. :) it's whatever the method was called on.. extraScrollPx : 150, itemSelector : "div.post", animate : false, localMode : false, bufferPx : 40, errorCallback : function(){} }, loadingImg : undefined, loadingMsg : undefined, container : undefined, currPage : 1, currDOMChunk : null, // defined in setup()'s load() isDuringAjax : false, isInvalidPage : false, isDone : false // for when it goes all the way through the archive. }; })(jQuery);