bootstrap_pager

= Bootstrap Pager

{}[http://badge.fury.io/rb/bootstrap_pager] {}[https://travis-ci.org/gemvein/bootstrap_pager] {}[https://coveralls.io/r/gemvein/bootstrap_pager]

Bootstrap Pager is an updated version of the Kaminari pagination gem, which is a Scope & Engine based, clean, powerful, customizable and sophisticated paginator for modern web app frameworks and ORMs

== New Features added in Bootstrap Pager

• Works with Bootstrap out of the box
• Now works with mountable rails engines using a namespaced route
• Semantic HTML5 markup goodness
• Added optional infinite scroll (off by default)

== Features

=== Clean Does not globally pollute +Array+, +Hash+, +Object+ or AR::Base.

=== Easy to use Just bundle the gem, then your models are ready to be paginated. No configuration required. Don't have to define anything in your models or helpers.

=== Simple scope-based API Everything is method chainable with less "Hasheritis". You know, that's the Rails 3 way. No special collection class or anything for the paginated values, instead using a general AR::Relation instance. So, of course you can chain any other conditions before or after the paginator scope.

=== Customizable engine-based I18n-aware helper As the whole pagination helper is basically just a collection of links and non-links, Bootstrap Pager renders each of them through its own partial template inside the Engine. So, you can easily modify their behaviour, style or whatever by overriding partial templates.

=== ORM & template engine agnostic Bootstrap Pager supports multiple ORMs (ActiveRecord, Mongoid, MongoMapper) multiple web frameworks (Rails, Sinatra), and multiple template engines (ERB, Haml).

=== Modern The pagination helper outputs the HTML5

tag by default. Plus, the helper supports Rails 3 unobtrusive Ajax.

=== Engine Namespace By passing in the :engine_namespace option, you can get the pager to use a different helper for your paths.

== Supported versions

• Ruby 1.8.7, 1.9.2, 1.9.3, 2.0.0, 2.1 (trunk)

• Rails 3.0.x, 3.1, 3.2, 4.0, 4.1 (edge)

• Haml 3+

• Mongoid 2+

• MongoMapper 0.9+

• DataMapper 1.1.0+

• Bootstrap 3

• CSS 3

• HTML 5

== Install

Put this line in your Gemfile: gem 'bootstrap_pager'

Then bundle install: % bundle install

== Usage

=== Query Basics

• the +page+ scope

  To fetch the 7th page of users (default +per_page+ is 25) User.page(7)

• the +per+ scope

  To show a lot more users per each page (change the +per_page+ value) User.page(7).per(50) Note that the +per+ scope is not directly defined on the models but is just a method defined on the page scope. This is absolutely reasonable because you will never actually use +per_page+ without specifying the +page+ number.

  Keep in mind that +per+ utilizes internally +limit+ and so it will override any +limit+ that was set previously User.count # => 1000 a = User.limit(5).count # => 5 b = a.page(1).per(20).size # => 20

• the +padding+ scope

  Occasionally you need to pad a number of records that is not a multiple of the page size. User.page(7).per(50).padding(3) Note that the +padding+ scope also is not directly defined on the models.

=== General configuration options

You can configure the following default values by overriding these values using BootstrapPager.configure method. default_per_page # 25 by default max_per_page # nil by default window # 4 by default outer_window # 0 by default left # 0 by default right # 0 by default page_method_name # :page by default param_name # :page by default

There's a handy generator that generates the default configuration file into config/initializers directory. Run the following generator command, then edit the generated file. % rails g bootstrap_pager:config

• changing +page_method_name+

  You can change the method name +page+ to +bonzo+ or +plant+ or whatever you like, in order to play nice with existing +page+ method or association or scope or any other plugin that defines +page+ method on your models.

=== Configuring default +per_page+ value for each model

• +paginates_per+

  You can specify default +per_page+ value per each model using the following declarative DSL. class User < ActiveRecord::Base paginates_per 50 end

=== Configuring max +per_page+ value for each model

• +max_paginates_per+

  You can specify max +per_page+ value per each model using the following declarative DSL. If the variable that specified via +per+ scope is more than this variable, +max_paginates_per+ is used instead of it. Default value is nil, which means you are not imposing any max +per_page+ value. class User < ActiveRecord::Base max_paginates_per 100 end

=== Controllers

• the page parameter is in params[:page]

  Typically, your controller code will look like this: @users = User.order(:name).page params[:page]

=== Views

• the same old helper method

  Just call the +paginate+ helper: <%= paginate @users %>

  This will render several ?page=N pagination links surrounded by an HTML5 <+nav+> tag.

=== Helpers

• the +paginate+ helper method

  <%= paginate @users %> This would output several pagination links such as « First ‹ Prev ... 2 3 4 5 6 7 8 9 10 ... Next › Last »

• specifying the "inner window" size (4 by default)

  <%= paginate @users, :window => 2 %> This would output something like ... 5 6 7 8 9 ... when 7 is the current page.

• specifying the "outer window" size (0 by default)

  <%= paginate @users, :outer_window => 3 %> This would output something like 1 2 3 4 ...(snip)... 17 18 19 20 while having 20 pages in total.

• outer window can be separately specified by +left+, +right+ (0 by default)

  <%= paginate @users, :left => 1, :right => 3 %> This would output something like 1 ...(snip)... 18 19 20 while having 20 pages in total.

• changing the parameter name (:+param_name+) for the links

  <%= paginate @users, :param_name => :pagina %> This would modify the query parameter name on each links.

• extra parameters (:+params+) for the links

  <%= paginate @users, :params => {:controller => 'foo', :action => 'bar'} %> This would modify each link's +url_option+. :+controller+ and :+action+ might be the keys in common.

• Ajax links (crazy simple, but works perfectly!)

  <%= paginate @users, :remote => true %> This would add data-remote="true" to all the links inside.

• the +link_to_next_page+ and +link_to_previous_page+ helper method

  <%= link_to_next_page @items, 'Next Page' %> This simply renders a link to the next page. This would be helpful for creating a Twitter-like pagination feature.

• the +page_entries_info+ helper method

  <%= page_entries_info @users %> This renders a helpful message with numbers of displayed vs. total entries.

=== I18n and labels

The default labels for 'first', 'last', 'previous', '...' and 'next' are stored in the I18n yaml inside the engine, and rendered through I18n API. You can switch the label value per I18n.locale for your internationalized application. Keys and the default values are the following. You can override them by adding to a YAML file in your Rails.root/config/locales directory.

en: views: pagination: first: "« First" last: "Last »" previous: "‹ Prev" next: "Next ›" truncate: "..."

=== Customizing the pagination helper

BootstrapPager includes a handy template generator.

• to edit your paginator

  Run the generator first, % rails g bootstrap_pager:views default

  then edit the partials in your app's app/views/bootstrap_pager/ directory.

• for Haml users

  Haml templates generator is also available by adding the -e haml option (this is automatically invoked when the default template_engine is set to Haml).

  % rails g bootstrap_pager:views default -e haml

• themes

  The generator has the ability to fetch several sample template themes from the external repository (https://github.com/amatsuda/bootstrap_pager_themes) in addition to the bundled "default" one, which will help you creating a nice looking paginator. % rails g bootstrap_pager:views THEME

  To see the full list of avaliable themes, take a look at the themes repository, or just hit the generator without specifying +THEME+ argument. % rails g bootstrap_pager:views

• multiple themes

  To utilize multiple themes from within a single application, create a directory within the app/views/bootstrap_pager/ and move your custom template files into that directory. % rails g bootstrap_pager:views default (skip if you have existing bootstrap_pager views) % cd app/views/bootstrap_pager % mkdir my_custom_theme % cp _.html. my_custom_theme/

  Next, reference that directory when calling the +paginate+ method:

  <%= paginate @users, :theme => 'my_custom_theme' %>

  Customize away!

  Note: if the theme isn't present or none is specified, bootstrap_pager will default back to the views included within the gem.

=== Paginating a generic Array object

BootstrapPager provides an Array wrapper class that adapts a generic Array object to the paginate view helper. However, the paginate helper doesn't automatically handle your Array object (this is intentional and by design). BootstrapPager::paginate_array method converts your Array object into a paginatable Array that accepts page method. BootstrapPager.paginate_array(my_array_object).page(params[:page]).per(10)

You can specify the +total_count+ value through options Hash. This would be helpful when handling an Array-ish object that has a different +count+ value from actual +count+ such as RSolr search result or when you need to generate a custom pagination. For example: BootstrapPager.paginate_array([], total_count: 145).page(params[:page]).per(10)

== Creating friendly URLs and caching

Because of the +page+ parameter and Rails 3 routing, you can easily generate SEO and user-friendly URLs. For any resource you'd like to paginate, just add the following to your +routes.rb+:

resources :my_resources do
  get 'page/:page', :action => :index, :on => :collection
end

This will create URLs like /my_resources/page/33 instead of /my_resources?page=33. This is now a friendly URL, but it also has other added benefits...

Because the +page+ parameter is now a URL segment, we can leverage on Rails page caching[http://guides.rubyonrails.org/caching_with_rails.html#page-caching]!

NOTE: In this example, I've pointed the route to my :index action. You may have defined a custom pagination action in your controller - you should point :action => :your_custom_action instead.

== Sinatra/Padrino support

Since version 0.13.0, bootstrap_pager started to support Sinatra or Sinatra-based frameworks experimentally.

To use bootstrap_pager and its helpers with these frameworks,

require 'bootstrap_pager/sinatra'

or edit gemfile:

gem 'bootstrap_pager', :require => 'bootstrap_pager/sinatra'

More features are coming, and again, this is still experimental. Please let us know if you found anything wrong with the Sinatra support.

== Infinite Scroll with Jquery

For infinite scroll technology, add jquery.infinitescroll to your application.js file.

//= require jquery.infinitescroll
//= require infinitescroll

Then, add class="infinitescroll" to the div containing your pagination call, and add the class "infinitescroll-item" to the items within that div that represent individual objects.

<div id="posts" class="infinitescroll">
    <div id="post_5" class="infinitescroll-item">
        ... Post content here ...
    </div>
    ... Many more posts here ...
    <%= pagination @posts %>
</div>

== Contributors

• Karen Lundgren - code updates
• Chad Lundgren - verbiage and usability advice

== Copyright

Copyright (c) 2013 Sour Cherry Web. See MIT-LICENSE for further details.