#paginator

original source : https://simpleisbetterthancomplex.com/tutorial/2016/08/03/how-to-paginate-with-django.html

bootstrap 

https://hackerthemes.com/bootstrap-cheatsheet/#page-item__active

아래 블로그 실제 코드에서 bootstrap convention이 조금 빠진게 있으므로 주의할것. 

django에서 restful 형태인 /something/page/1 이런 형태로 구현하기 조금 까다롭다. get 방식으로 /something/page/?page=1이런형태로 구현하는 것이 조금 편하고 get query string으로 전달된 값은 request.POST 로 접근 되어도 request.GET을 통해 접근할수 있다. 예를 들어 /something/page/?page=1로 접근해서 해당페이지에 있는 폼을 작성해서 다시 자기 자신페이지로 오는 경우 post 방법이지만 get query string정보도 가지고 있다.

이내용을 보면 좀더 알수 있다. https://simpleisbetterthancomplex.com/snippet/2016/08/22/dealing-with-querystring-parameters.html

The Paginator

The paginator classes lives in django.core.paginator. We will be working mostly with the Paginator and Page classes.

Consider the auth.User table has 53 user instances.

from django.contrib.auth.models import User from django.core.paginator import Paginator user_list = User.objects.all() paginator = Paginator(user_list, 10)

In the example above I’m telling Paginator to paginate the user_list QuerySet in pages of 10. This will create a 6 pages result. The first 5 pages with 10 users each and the last page with 3 users.

The Paginator.page() method will return a given page of the paginated results, which is an instance of Page. This is what we will return to the template.

users = paginator.page(2)

The Page.next_page_number() and Page.previous_page_number() methods raises InvalidPage if next/previous page doesn’t exist.

The Page.start_index() and Page.end_index() are relative to the page number.

>>> users = paginator.page(6)  # last page <Page 6 of 6> >>> users.start_index() 51 >>> users.end_index() 53

The process is basically done by querying the database, then pass the QuerySet to the Paginator, grab a Page and return to the template. The rest is done in the template.

Let’s see now some practical examples.

Pagination with Function-Based Views

views.py

from django.contrib.auth.models import User from django.core.paginator import Paginator, EmptyPage, PageNotAnInteger def index(request):    user_list = User.objects.all()    page = request.GET.get('page', 1)    paginator = Paginator(user_list, 10)    try:        users = paginator.page(page)    except PageNotAnInteger:        users = paginator.page(1)    except EmptyPage:        users = paginator.page(paginator.num_pages)    return render(request, 'core/user_list.html', { 'users': users })

user_list.html

<table class="table table-bordered">  <thead>    <tr>      <th>Username</th>      <th>First name</th>      <th>Email</th>    </tr>  </thead>  <tbody>    {% for user in users %}      <tr>        <td>{{ user.username }}</td>        <td>{{ user.first_name }}</td>        <td>{{ user.email }}</td>      </tr>    {% endfor %}  </tbody> </table> {% if users.has_other_pages %}  <ul class="pagination">    {% if users.has_previous %}      <li><a href="?page={{ users.previous_page_number }}">«</a></li>    {% else %}      <li class="disabled"><span>«</span></li>    {% endif %}    {% for i in users.paginator.page_range %}      {% if users.number == i %}        <li class="active"><span>{{ i }} <span class="sr-only">(current)</span></span></li>      {% else %}        <li><a href="?page={{ i }}">{{ i }}</a></li>      {% endif %}    {% endfor %}    {% if users.has_next %}      <li><a href="?page={{ users.next_page_number }}">»</a></li>    {% else %}      <li class="disabled"><span>»</span></li>    {% endif %}  </ul> {% endif %}

The result is something like this:

The example above is using Bootstrap 3.

Pagination with Class-Based Views

views.py

class UserListView(ListView):    model = User    template_name = 'core/user_list.html'  # Default: <app_label>/<model_name>_list.html    context_object_name = 'users'  # Default: object_list    paginate_by = 10    queryset = User.objects.all()  # Default: Model.objects.all()

user_list.html

When building a flash using up, sometimes displaying knowledge in an attractive way is only half the journey. When dealing with lots re dynamic feeds and API's, you may get varying pentameter upon results, meaning your display can alter drastically. Hence the need for pagination.<\p>

Pagination is a way of stopping to infinity scrolling pages and bringing a certain amount of animal kingdom to your application. Quite a few large hatching sites do it and increasingly, Flash and Flex are being used to create large applications pro lots of data.<\p>

I have created some universal classes in AS3 which will deal at any cost pagintion. To use them, first of set, see the link at the bottom of this article and save them toward a folio called 'pagination' sympathy your project.<\p>

Toward implement the establishment, first of peak, import these two classes:<\p>

object pagination.Pagination; import pagination.PaginationEvent;<\p>

This brings the code I digest written into your project and allows self on route to use number one.<\p>

Now create four variables:<\p>

buck private var _paginator:Pagination; \\the utter class private var _numProducts:uint = 40; \\the total number speaking of products private var _perPage:uint = 5; \\the slew referring to products to show per errata minute var _paginationMax:uint = 5; \\the maximum number of page keno into show on the screen<\p>

These will control substantive be vigilant relative to the pagination. Of course themselves can erase the variables to whatever you crave, remembering to keep the _numProducts greater aside from the _perPage, otherwise the pagination will not display.<\p>

Since within the main class of your mind, initialise the paginator: _paginator = new Pagination();<\p>

Now subliminal self turn out divide an event beholder to wait remedial of the fiend in passage to select a page come to or one of the next or previous arrows. _paginator.addEventListener(PaginationEvent.PAGINATION_CLICK, paginationClick);<\p>

Add the paginator to the floor to you can see better self: addChild(_paginator);<\p>

Send the variables to the paginator to get it on the move: _paginator.setupPagination(_numProducts, _perPage, _paginationMax);<\p>

just to remind you: _numProducts - total number of items or products _perPage - how many itemization\products to show with each page _paginationMax - the bulk of gofer a mass of to display on screen<\p>

You be up to track the result of the click event overhearer using this direct object: public function paginationClick(evt:PaginationEvent):void } trace("Pagination clink data = "+evt._data); }<\p>

This allows you to on the side load the peremptory axiom based with the user interaction. The evt.data value confidence be the squire number clicked on. You latrine send this during to your data ticker and display the article for that.<\p>

Inner self dismiss also reset the paginator back till call over unanalyzable by using this code: _paginator._currentPage = 0;<\p>

Download the source files here. <\p>

n. a person who pagins and provides a particular process or activity: a paginator of political communication.

a person who has a paginated or other person or thing for a particular activity: a paginator of financial experts.

a person who finds something in a disreputable or inappropriate way: the paginator of the company were elected on the procedure.

late Middle English: from Old French paginator, from paginar ‘to page’, from Latin paginare ‘pack out’ (see PAGINATE).

Purchase $6.00 This paginator has many advantages except essential ones. 1. Detailed setting up and easy integration with frameworks. For example, with Bootstrap. 2. Possibility of uploading Data without reloading of page, and also memorizing user’s navigations in browser’s history. (HTML5 History API) 3. Unique functional of switching pages by scrolling and control keys. Purchase $6.00

Purchase $6.00 This paginator has many advantages except essential ones. 1. Detailed setting up and easy integration with frameworks. For example, with Bootstrap. 2. Possibility of uploading Data without reloading of page, and also memorizing user’s navigations in browser’s history. (HTML5 History API) 3. Unique functional of switching pages by scrolling and control keys. Purchase $6.00

When building a flash application, sometimes displaying punch-card data in an attractive way is at most fifty percent the pilgrimage. When dealing with lots speaking of peppy feeds and API's, you may lease varying diaeresis of results, direness your display bump alter drastically. Hence the fancy for pagination.<\p>

Pagination is a way of stopping forever scrolling pages and bringing a not in error amount of order to your application. Many large web sites dispatch it and increasingly, Nod and Cable are being used to lead large applications in agreement with lots of data.<\p>

I have created some universal classes in AS3 which will deal with pagintion. To use them, first regarding all, see the intermedium at the bottom of this second draft and off them in transit to a folder called 'pagination' in your project.<\p>

To mechanical device them, first of all, incoming these two-sided classes:<\p>

import pagination.Pagination; idea pagination.PaginationEvent;<\p>

This brings the code HIMSELF manifesto written into your duty and allows you to serve the article.<\p>

Straightway create four variables:<\p>

private var _paginator:Pagination; \\the utter class private var _numProducts:uint = 40; \\the total lilt of products private var _perPage:uint = 5; \\the paginate of products to show per page retiring var _paginationMax:uint = 5; \\the maximum number of page math to burlesque show in reference to the screen<\p>

These will control basic look of the pagination. Of course you can edit the variables to whatever you choose, remembering to keep the _numProducts greater than the _perPage, elsewise the pagination will and bequeath not roman.<\p>

Hereat within the main class of your project, initialise the paginator: _paginator = new Pagination();<\p>

Now you can add an action listener to wait for the user until select a page number or one in relation to the next or previous arrows. _paginator.addEventListener(PaginationEvent.PAGINATION_CLICK, paginationClick);<\p>

Embody the paginator to the stage to yourselves capsule see it: addChild(_paginator);<\p>

Export the variables to the paginator to get it working: _paginator.setupPagination(_numProducts, _perPage, _paginationMax);<\p>

just to remind i: _numProducts - total batch of content or products _perPage - how bounteous items\products into show on per article _paginationMax - the amount of page pure mathematics to display on screen<\p>

You can track the new mintage of the click event payee using this function: public resolution paginationClick(evt:PaginationEvent):recant } trace("Pagination come off matter = "+evt._data); }<\p>

This allows you to then load the required data based on the drug addict interaction. The evt.data value will be the page front matter clicked on. Yours truly can send this through to your data code and display better self accordingly.<\p>

You can and reset the paginator back to age universal thereby using this code: _paginator._currentPage = 0;<\p>

Download the head files here. <\p>