forked from GNUsocial/gnu-social
262 lines
9.8 KiB
JavaScript
262 lines
9.8 KiB
JavaScript
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/*!
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// Infinite Scroll jQuery plugin
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// copyright Paul Irish, licensed GPL & MIT
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// version 1.2.090804
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// home and docs: http://www.infinite-scroll.com
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*/
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// todo: add preloading option.
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;(function($){
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$.fn.infinitescroll = function(options,callback){
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// console log wrapper.
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function debug(){
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if (opts.debug) { window.console && console.log.call(console,arguments)}
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}
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// grab each selector option and see if any fail.
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function areSelectorsValid(opts){
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for (var key in opts){
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if (key.indexOf && key.indexOf('Selector') && $(opts[key]).length === 0){
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debug('Your ' + key + ' found no elements.');
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return false;
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}
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return true;
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}
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}
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// find the number to increment in the path.
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function determinePath(path){
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path.match(relurl) ? path.match(relurl)[2] : path;
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// there is a 2 in the url surrounded by slashes, e.g. /page/2/
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if ( path.match(/^(.*?)\b2\b(.*?$)/) ){
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path = path.match(/^(.*?)\b2\b(.*?$)/).slice(1);
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} else
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// if there is any 2 in the url at all.
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if (path.match(/^(.*?)2(.*?$)/)){
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debug('Trying backup next selector parse technique. Treacherous waters here, matey.');
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path = path.match(/^(.*?)2(.*?$)/).slice(1);
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} else {
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debug('Sorry, we couldn\'t parse your Next (Previous Posts) URL. Verify your the css selector points to the correct A tag. If you still get this error: yell, scream, and kindly ask for help at infinite-scroll.com.');
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props.isInvalidPage = true; //prevent it from running on this page.
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}
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return path;
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}
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// 'document' means the full document usually, but sometimes the content of the overflow'd div in local mode
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function getDocumentHeight(){
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// weird doubletouch of scrollheight because http://soulpass.com/2006/07/24/ie-and-scrollheight/
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return opts.localMode ? ($(props.container)[0].scrollHeight && $(props.container)[0].scrollHeight)
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// needs to be document's height. (not props.container's) html's height is wrong in IE.
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: $(document).height()
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}
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function isNearBottom(opts,props){
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// distance remaining in the scroll
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// computed as: document height - distance already scroll - viewport height - buffer
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var pixelsFromWindowBottomToBottom = getDocumentHeight() -
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(opts.localMode ? $(props.container).scrollTop() :
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// have to do this bs because safari doesnt report a scrollTop on the html element
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($(props.container).scrollTop() || $(props.container.ownerDocument.body).scrollTop())) -
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$(opts.localMode ? props.container : window).height();
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debug('math:',pixelsFromWindowBottomToBottom, props.pixelsFromNavToBottom);
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// if distance remaining in the scroll (including buffer) is less than the orignal nav to bottom....
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return (pixelsFromWindowBottomToBottom - opts.bufferPx < props.pixelsFromNavToBottom);
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}
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function showDoneMsg(){
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props.loadingMsg
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.find('img').hide()
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.parent()
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.find('div').html(opts.donetext).animate({opacity: 1},2000).fadeOut('normal');
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// user provided callback when done
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opts.errorCallback();
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}
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function infscrSetup(path,opts,props,callback){
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if (props.isDuringAjax || props.isInvalidPage || props.isDone) return;
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if ( opts.infiniteScroll && !isNearBottom(opts,props) ) return;
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// we dont want to fire the ajax multiple times
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props.isDuringAjax = true;
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// show the loading message and hide the previous/next links
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props.loadingMsg.appendTo( opts.contentSelector ).show();
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if(opts.infiniteScroll) $( opts.navSelector ).hide();
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// increment the URL bit. e.g. /page/3/
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props.currPage++;
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debug('heading into ajax',path);
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// if we're dealing with a table we can't use DIVs
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var box = $(opts.contentSelector).is('table') ? $('<tbody/>') : $('<div/>');
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box
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.attr('id','infscr-page-'+props.currPage)
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.addClass('infscr-pages')
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.appendTo( opts.contentSelector )
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.load( path.join( props.currPage ) + ' ' + opts.itemSelector,null,function(){
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// if we've hit the last page...
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if (props.isDone){
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showDoneMsg();
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return false;
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} else {
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// if it didn't return anything
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if (box.children().length == 0){
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// fake an ajaxError so we can quit.
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$.event.trigger( "ajaxError", [{status:404}] );
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}
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// fadeout currently makes the <em>'d text ugly in IE6
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props.loadingMsg.fadeOut('normal' );
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// smooth scroll to ease in the new content
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if (opts.animate){
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var scrollTo = $(window).scrollTop() + $('#infscr-loading').height() + opts.extraScrollPx + 'px';
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$('html,body').animate({scrollTop: scrollTo}, 800,function(){ props.isDuringAjax = false; });
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}
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// pass in the new DOM element as context for the callback
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callback.call( box[0] );
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if (!opts.animate) props.isDuringAjax = false; // once the call is done, we can allow it again.
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}
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}); // end of load()
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} // end of infscrSetup()
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// lets get started.
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var opts = $.extend({}, $.infinitescroll.defaults, options);
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var props = $.infinitescroll; // shorthand
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callback = callback || function(){};
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if (!areSelectorsValid(opts)){ return false; }
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// we doing this on an overflow:auto div?
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props.container = opts.localMode ? this : document.documentElement;
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// contentSelector we'll use for our .load()
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opts.contentSelector = opts.contentSelector || this;
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// get the relative URL - everything past the domain name.
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var relurl = /(.*?\/\/).*?(\/.*)/;
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var path = $(opts.nextSelector).attr('href');
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if (!path) { debug('Navigation selector not found'); return; }
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// set the path to be a relative URL from root.
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path = determinePath(path);
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// reset scrollTop in case of page refresh:
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if (opts.localMode) $(props.container)[0].scrollTop = 0;
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// distance from nav links to bottom
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// computed as: height of the document + top offset of container - top offset of nav link
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props.pixelsFromNavToBottom = getDocumentHeight() +
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$(props.container).offset().top -
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$(opts.navSelector).offset().top;
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// define loading msg
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props.loadingMsg = $('<div id="infscr-loading" style="text-align: center;"><img alt="Loading..." src="'+
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opts.loadingImg+'" /><div>'+opts.loadingText+'</div></div>');
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// preload the image
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(new Image()).src = opts.loadingImg;
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// set up our bindings
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$(document).ajaxError(function(e,xhr,opt){
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debug('Page not found. Self-destructing...');
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// die if we're out of pages.
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if (xhr.status == 404){
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showDoneMsg();
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props.isDone = true;
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$(opts.localMode ? this : window).unbind('scroll.infscr');
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}
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});
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if(opts.infiniteScroll){
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// bind scroll handler to element (if its a local scroll) or window
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$(opts.localMode ? this : window)
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.bind('scroll.infscr', function(){ infscrSetup(path,opts,props,callback); } )
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.trigger('scroll.infscr'); // trigger the event, in case it's a short page
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}else{
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$(opts.nextSelector).click(
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function(){
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infscrSetup(path,opts,props,callback);
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return false;
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}
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);
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}
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return this;
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} // end of $.fn.infinitescroll()
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// options and read-only properties object
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$.infinitescroll = {
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defaults : {
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debug : false,
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infiniteScroll : true,
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preload : false,
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nextSelector : "div.navigation a:first",
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loadingImg : "http://www.infinite-scroll.com/loading.gif",
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loadingText : "<em>Loading the next set of posts...</em>",
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donetext : "<em>Congratulations, you've reached the end of the internet.</em>",
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navSelector : "div.navigation",
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contentSelector : null, // not really a selector. :) it's whatever the method was called on..
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extraScrollPx : 150,
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itemSelector : "div.post",
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animate : false,
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localMode : false,
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bufferPx : 40,
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errorCallback : function(){}
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},
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loadingImg : undefined,
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loadingMsg : undefined,
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container : undefined,
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currPage : 1,
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currDOMChunk : null, // defined in setup()'s load()
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isDuringAjax : false,
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isInvalidPage : false,
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isDone : false // for when it goes all the way through the archive.
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};
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})(jQuery);
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