JQuery Infinite Scroll - 达到最大页面限制后“加载更多”

Question

I am using this infinite scroll plugin: https://github.com/paulirish/infinite-scroll but due to the fact I have lots of pages and the browser crashes due to memory issues, I want to implement a "load more" button after so many pages of infinite scrolling like Google images, Twitter and other apps.

I therefore need to stop infinite scrolling when the current page gets to maxPage and allow the user to select a "Load More" button. Hopefully solving the memory issues.

I know other plugins do this but I do not have the option to change plugins and so need to be able to create a custom function for when the maxPage limit is reached. This is discussed in the link below but I cannot find any further documentation on how to do this exactly.

https://github.com/paulirish/infinite-scroll/issues/300

I have tried the below code based on the documentation. The loading image starts as each page scrolls towards the end and then shows the 'load more' message when page 5 is reached but the alert('load more'); is activated on every page, not ont he last page. can anyone suggest what I need to do to create a custom function when the maxpage is reached? or any other work around for the memory problem?

    // Infinite Ajax Scroll configuration
    $container.infinitescroll({
        navSelector: "div.paginate",
        nextSelector: "div.paginate a",
        itemSelector: "div.element",
        maxPage: 5,
        loading: {
          finishedMsg: 'Load More',
          msgText: " ",
          img: 'public/img/ajax-loader.gif',
          finished: function(){
               alert('finished');
          }

        }
    },
    function(newElements) {

        var $newElements = $(newElements).css({opacity: 0});
        //remove the first item
        $newElements.splice(0, 1);

        $container.isotope('appended', $newElements);

    }

});

PS. This other post belongs to me: jquery infinite scroll plugin - loading and memory issues , its the same issue which I put a bounty on days ago, so if you can resolve this I will also reward you with the bounty ;)

Answer 1

Looking at the plugin code, this line in _showdonemsg :

// user provided callback when done
opts.errorCallback.call($(opts.contentSelector)[0],'done');

seems to indicate errorCallback is called when the max is reached. Perhaps you could use this to remove previous DOM content and then continue scrolling.

Answer 2

Try changing your code like this, so that you increment a counter each time you load content, and check that counter hasn't reached a certain value before adding more content.

var cLoaded = 0, iMyLoadLimit = 5;

    // Infinite Ajax Scroll configuration
    $container.infinitescroll({
        navSelector: "div.paginate",
        nextSelector: "div.paginate a",
        itemSelector: "div.element",
        maxPage: 5,
        loading: {
          finishedMsg: 'Load More',
          msgText: " ",
          img: 'public/img/ajax-loader.gif',
          finished: function(){
               alert('finished');
          }

        }
    },
    function(newElements) {
        if(cLoaded < iMyLoadLimit){

            var $newElements = $(newElements).css({opacity: 0});
            //remove the first item
            $newElements.splice(0, 1);

            $container.isotope('appended', $newElements);
        }
        cLoaded++;
    }

});