Can a javascript code for "Infinite Scroll" be created to manage the back button?

Head over to this website: Experiment with the infinite scroll feature. You may notice that when you click a link and then press "back", there are some glitches.

Therefore, I am considering developing my own version of an Infinite Scroll functionality.

  • My approach would involve loading an AJAX call when the user reaches the bottom. Then using JQuery's "append" function to add the result to the specified div. Afterward, I will execute other functions on those elements (such as setting background images using javascript).

Do you think this plan will be effective? Will it allow me to manage the back button functionality smoothly?

Answer №1

While working on a project, I explored an idea to enhance user experience by implementing a feature that allows the back button to return to the place where a link was clicked, similar to traditional browsing.

To achieve this, one approach I considered was recording the page position during infinite scrolling using the window.location.hash value. For a detailed explanation and implementation in JavaScript or jQuery, you can refer to this answer with insights on using Asual's address plugin.

The core concept involves tracking the current page while loading content dynamically. An example snippet would be:

// Function to navigate to the next page
function scrollToNextPage(page){
   // Your infinite scrolling logic here
   $.address.parameter("currentPage", page);
}

$.address.externalChange(function(){
   var page = $.address.parameter("currentPage"),
       top = $.address.parameter("linkTop");

   loadAjaxUpTo(page);   
   $('html, body').animate({ scrollTop: top }, 500);
});

// Capture the position of the clicked link
$("a").live('click', function(){
   $.address.parameter("linkTop", $(this).scrollTop());
});

Although I didn't personally implement the last part (capturing link position), it should work smoothly to scroll to the desired location. However, I must note that such functionality may not always be necessary. Depending on the context, reloading AJAX and re-executing scripts for multiple pages can significantly impact performance. Additionally, achieving smooth scrolling animations can be challenging. Considerations like these led me to question the practicality of this feature for certain projects.

If you still decide to proceed with this approach, ensure you utilize a GET request to fetch pages and manage caching settings appropriately to optimize performance. In my experience, Ajax requests with GET were more cache-friendly compared to POST requests, which tended to bypass caching mechanisms.

Answer №2

To effectively manage the back button functionality, one must manipulate the location hash (the part of the URL after the # symbol). There are two approaches to handling the back and forward buttons:

  1. Create a unique
    <a name="bookmark1"></a>
    for each section added and update the location.hash accordingly.
  2. Utilize a setInterval method with a short interval like 100ms to monitor changes in the location.hash and navigate to the specified portion of the page. This step is necessary as it's not possible to detect the activation of the back/forward buttons directly.

The following code demonstrates the second technique by incorporating unique tags like

<a name="ajax-section-1"></a>
and ajax-section-2 in each Ajax request.

function addToBottom(htmlToAdd) {
    $('#main-div').append(htmlToAdd);
    window.location.hash = $('#main-div a[name^=ajax-section-]').last().attr('name');
}

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