f97380fdb5
Note that the current version of the infinitescroll jquery plugin fixes this, but I'm not updating to it because the code's been altered from the upstream version, apparently to stop it from actually working as infinite scroll. WTF? :)
262 lines
9.8 KiB
JavaScript
262 lines
9.8 KiB
JavaScript
|
|
/*!
|
|
// 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);
|