magoosh/jquery-infinite-pages

Simple infinitely scrolling pages for jQuery, gemified for Rails

jQuery Infinite Pages

A light-weight jQuery plugin for adding infinite scrolling to paginated HTML views that tastes great with Rails and Kaminari.

This project was originally designed for Rails, but the core plugin is flexible enough to use anywhere.

Installation

Add this line to your application's Gemfile:

gem 'jquery-infinite-pages'

And then execute:

bundle install

Add to your application.js file:

//= require jquery.infinite-pages

Non-Rails

Just copy the jquery.infinite-pages.js.coffee file from app/assets/javascripts to wherever you want it.

Usage

jQuery Infinite Pages binds to an element containing a rel="next" pagination link and watches for scroll events.

When the link is close to the bottom of the screen, an async request to the next page is triggered. The server's response should then append the new page and update the pagination link.

# Setup plugin and define optional event callbacks
$('.infinite-table').infinitePages
 debug: true
 buffer: 200 # load new page when within 200px of nav link
 context: '.pane' # define the scrolling container (defaults to window)
 loading: ->
   # jQuery callback on the nav element
   $(this).text("Loading...")
 success: ->
   # called after successful ajax call
 error: ->
   # called after failed ajax call
   $(this).text("Trouble! Please drink some coconut water and click again")

You can also manually control the firing of load events:

# Force load of the next page
$('.infinite-table').infinitePages('next')

# Pause firing of events on scroll
$('.infinite-table').infinitePages('pause')

# Resume...
$('.infinite-table').infinitePages('resume')

Rails/Kaminari Example

The following is an example of how to integrate this plugin into your Rails app using Kaminari.

Set up pagination in lessons_controller.rb:

class LessonsController
  def index
    @lessons = Lesson.order('lessons.name ASC').page(params[:page])
  end
end

Write the template for your list of lessons in app/views/lessons/index.html.erb:

<div class="infinite-table">
  <table>
    <tr>
      <th>Lesson</th>
      <th></th>
    </tr>
    <%= render :partial => 'lessons', :object => @lessons %>
  </table>
  <p class="pagination">
    <%= link_to_next_page(@lessons, 'Next Page', :remote => true) %>
  </p>
</div>

...and app/views/lessons/_lessons.html.erb:

<% @lessons.each do |lesson| %>
  <tr>
    <td><%= lesson.name %> (<%= lesson.length.format %>)</td>
    <td><%= link_to "watch", lesson_path(lesson) %></td>
  </tr>
<% end %>

Append new data to the table in app/views/lessons/index.js.erb:

// Append new data
$("<%=j render(:partial => 'lessons', :object => @lessons) %>")
  .appendTo($(".infinite-table table"));

// Update pagination link
<% if @lessons.last_page? %>
  $('.pagination').html("That's all, folks!");
<% else %>
  $('.pagination')
    .html("<%=j link_to_next_page(@lessons, 'Next Page', :remote => true) %>");
<% end %>

At this point, the pagination link at the bottom of your table should allow you to load the next page without refreshing. Finally, we trigger the next page load with the infinitePages plugin in app/assets/javascripts/lessons.js.coffee:

$ ->
  # Configure infinite table
  $('.infinite-table').infinitePages
    # debug: true
    loading: ->
      $(this).text('Loading next page...')
    error: ->
      $(this).button('There was an error, please try again')

Voila! You should now have an infinitely long list of lessons.