forked from GNUsocial/gnu-social
252 lines
9.5 KiB
JavaScript
252 lines
9.5 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') && $(opts[key]).length === 0){
|
||
|
|
debug('Your ' + key + ' found no elements.');
|
||
|
|
return false;
|
||
|
|
}
|
||
|
|
return true;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
// find the number to increment in the path.
|
||
|
|
function determinePath(path){
|
||
|
|
|
||
|
|
path.match(relurl) ? path.match(relurl)[2] : path;
|
||
|
|
|
||
|
|
// there is a 2 in the url surrounded by slashes, e.g. /page/2/
|
||
|
|
if ( path.match(/^(.*?)\b2\b(.*?$)/) ){
|
||
|
|
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 ( !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();
|
||
|
|
$( 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');
|
||
|
|
}
|
||
|
|
});
|
||
|
|
|
||
|
|
// 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
|
||
|
|
|
||
|
|
|
||
|
|
return this;
|
||
|
|
|
||
|
|
} // end of $.fn.infinitescroll()
|
||
|
|
|
||
|
|
|
||
|
|
|
||
|
|
// options and read-only properties object
|
||
|
|
|
||
|
|
$.infinitescroll = {
|
||
|
|
defaults : {
|
||
|
|
debug : false,
|
||
|
|
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);
|