README.md

infinite-scroll-with-isinviewport

Simple Infinite Scroll uses jquery plugin isInViewport developed by zeusdeux to trigger load more action by determine the reach of the loading element with the plugin.

Demo

http://opensource.cbl-web.com/infinite-scroll-with-isinviewport

The example uses masonry for beautiful showcase, it is not necessary.

How it Work

Firstly, we need to listen the scroll event of $(window), by detect the .loadmore element is or is not in-viewport to decide do or not do the load more action.

Then we need to check it is during loading or not to prevent more then one load more action to be called.

Finally, call your loadMore function.

I would suggest you can save the load more ajax link, the page number and the max page number all in the .loadmore element by data attribute like the demo shown.

$container = $('#item-list');
$container.masonry();

$(window).scroll(function() {
	if(!$('.loadmore').hasClass('nomore') && $('.loadmore').is(":in-viewport")) {
		if(!$('.loadmore').hasClass('loading')) {
			loadMore($('.loadmore'));
		};
	};
});

function loadMore(el) {
	var nextPage = el.data('nextpage');
	el.addClass('loading');
	/*********** Do your ajax requrest to get more item ***********/
	setTimeout(function() { // Here I set a delay to show the loading effect more clear, you can remove this from your production
		$.post(el.data('url'),{page:nextPage},function(data) {
			$items = $(data); // Assume data is the html body of the items
			$container.append($items);
			$container.masonry('appended',$items);
			el.removeClass('loading'); // Remove the class "loading" from the .loadmore element to allow next load more event
			nextPage++;
			el.data('nextpage',nextPage); // Add up the page number and save back to the data attribute
			if(nextPage>el.data('maxpage')) { // Check if maxpage is reached
				/****** Do something to alert user no more item can load ******/
				el.addClass('nomore'); // This example I add a nomore class to .loadmore element and use css to show that no item is available
				/****** Do something to alert user no more item can load ******/
			}
		});
	},800);
	/*********** Do your ajax requrest to get more item ***********/
};

The html .loadmore element:

<div class="loadmore" data-nextpage="2" data-url="./ajax/path-to-load-more.html" data-maxpage="5">
  <div class="spinner-wrap">
    <div class="spinner"></div>
  </div>
</div>