Previous Next

Usage

Paginating data collections

In order to paginate items into pages, Zend_Paginator must have a generic way of accessing that data. For that reason, all data access takes place through data source adapters. Several adapters ship with Zend Framework by default:

Adapters for Zend_Paginator
Adapter Description
Array Use a PHP array
DbSelect Use a Zend_Db_Select instance, which will return an array
DbTableSelect Use a Zend_Db_Table_Select instance, which will return an instance of Zend_Db_Table_Rowset_Abstract. This provides additional information about the result set, such as column names.
Iterator Use an » Iterator instance
Null Do not use Zend_Paginator to manage data pagination. You can still take advantage of the pagination control feature.

Nota:

Instead of selecting every matching row of a given query, the DbSelect and DbTableSelect adapters retrieve only the smallest amount of data necessary for displaying the current page.

Because of this, a second query is dynamically generated to determine the total number of matching rows. However, it is possible to directly supply a count or count query yourself. See the setRowCount() method in the DbSelect adapter for more information.

To create an instance of Zend_Paginator, you must supply an adapter to the constructor:

$paginator = new Zend_Paginator(new Zend_Paginator_Adapter_Array($array));

For convenience, you may take advantage of the static factory() method for the adapters packaged with Zend Framework:

$paginator = Zend_Paginator::factory($array);

Nota:

In the case of the Null adapter, in lieu of a data collection you must supply an item count to its constructor.

Although the instance is technically usable in this state, in your controller action you'll need to tell the paginator what page number the user requested. This allows him to advance through the paginated data.

$paginator->setCurrentPageNumber($page);

The simplest way to keep track of this value is through a URL. Although we recommend using a Zend_Controller_Router_Interface-compatible router to handle this, it is not a requirement.

The following is an example route you might use in an INI configuration file:

routes.example.route = articles/:articleName/:page
routes.example.defaults.controller = articles
routes.example.defaults.action = view
routes.example.defaults.page = 1
routes.example.reqs.articleName = \w+
routes.example.reqs.page = \d+

With the above route (and using Zend Framework MVC components), you might set the current page number like this:

$paginator->setCurrentPageNumber($this->_getParam('page'));

There are other options available; see Configuration for more on them.

Finally, you'll need to assign the paginator instance to your view. If you're using Zend_View with the ViewRenderer action helper, the following will work:

$this->view->paginator = $paginator;

The DbSelect and DbTableSelect adapter

The usage of most adapters is pretty straight-forward. However, the database adapters require a more detailed explanation regarding the retrieval and count of the data from the database.

To use the DbSelect and DbTableSelect adapters you don't have to retrieve the data upfront from the database. Both adapters do the retrieval for you, aswell as the counting of the total pages. If additional work has to be done on the database results the adapter getItems() method has to be extended in your application.

Additionally these adapters do not fetch all records from the database in order to count them. Instead, the adapters manipulates the original query to produce the corresponding COUNT query. Paginator then executes that COUNT query to get the number of rows. This does require an extra round-trip to the database, but this is many times faster than fetching an entire result set and using count(). Especially with large collections of data.

The database adapters will try and build the most efficient query that will execute on pretty much all modern databases. However, depending on your database or even your own schema setup, there might be more efficient ways to get a rowcount. For this scenario the database adapters allow you to set a custom COUNT query. For example, if you keep track of the count of blog posts in a separate table, you could achieve a faster count query with the following setup:

$adapter = new Zend_Paginator_Adapter_DbSelect($db->select()->from('posts'));
$adapter->setRowCount(
    $db->select()
       ->from(
            'item_counts',
            array(
               Zend_Paginator_Adapter_DbSelect::ROW_COUNT_COLUMN => 'post_count'
            )
         )
);

$paginator = new Zend_Paginator($adapter);

This approach will probably not give you a huge performance gain on small collections and/or simple select queries. However, with complex queries and large collections, a similar approach could give you a significant performance boost.

Rendering pages with view scripts

The view script is used to render the page items (if you're using Zend_Paginator to do so) and display the pagination control.

Because Zend_Paginator implements the SPL interface » IteratorAggregate, looping over your items and displaying them is simple.



Example

paginator)): ?>
    paginator as $item): ?>
paginationControl($this->paginator, 'Sliding', 'my_pagination_control.phtml'); ?>

Notice the view helper call near the end. PaginationControl accepts up to four parameters: the paginator instance, a scrolling style, a view partial, and an array of additional parameters.

The second and third parameters are very important. Whereas the view partial is used to determine how the pagination control should look, the scrolling style is used to control how it should behave. Say the view partial is in the style of a search pagination control, like the one below:

zend.paginator.usage.rendering.control.png

What happens when the user clicks the "next" link a few times? Well, any number of things could happen. The current page number could stay in the middle as you click through (as it does on Yahoo!), or it could advance to the end of the page range and then appear again on the left when the user clicks "next" one more time. The page numbers might even expand and contract as the user advances (or "scrolls") through them (as they do on Google).

There are four scrolling styles packaged with Zend Framework:

Scrolling styles for Zend_Paginator
Scrolling style Description
All Returns every page. This is useful for dropdown menu pagination controls with relatively few pages. In these cases, you want all pages available to the user at once.
Elastic A Google-like scrolling style that expands and contracts as a user scrolls through the pages.
Jumping As users scroll through, the page number advances to the end of a given range, then starts again at the beginning of the new range.
Sliding A Yahoo!-like scrolling style that positions the current page number in the center of the page range, or as close as possible. This is the default style.

The fourth and final parameter is reserved for an optional associative array of additional variables that you want available in your view partial (available via $this). For instance, these values could include extra URL parameters for pagination links.

By setting the default view partial, default scrolling style, and view instance, you can eliminate the calls to PaginationControl completely:

Zend_Paginator::setDefaultScrollingStyle('Sliding');
Zend_View_Helper_PaginationControl::setDefaultViewPartial(
    'my_pagination_control.phtml'
);
$paginator->setView($view);

When all of these values are set, you can render the pagination control inside your view script with a simple echo statement:

paginator; ?>

Nota:

Of course, it's possible to use Zend_Paginator with other template engines. For example, with Smarty you might do the following:

$smarty->assign('pages', $paginator->getPages());

You could then access paginator values from a template like so:

{$pages->pageCount}

Example pagination controls

The following example pagination controls will hopefully help you get started:

Search pagination:



pageCount): ?>
previous)): ?> < Previous | < Previous | pagesInRange as $page): ?> current): ?> | | next)): ?> Next > Next >

Item pagination:



pageCount): ?>
firstItemNumber; ?> - lastItemNumber; ?> of totalItemCount; ?> previous)): ?> First | First | previous)): ?> < Previous | < Previous | next)): ?> Next > | Next > | next)): ?> Last Last

Dropdown pagination:

pageCount): ?>




Listing of properties

The following options are available to pagination control view partials:

Properties available to view partials
Property Type Description
first integer First page number (i.e., 1)
firstItemNumber integer Absolute number of the first item on this page
firstPageInRange integer First page in the range returned by the scrolling style
current integer Current page number
currentItemCount integer Number of items on this page
itemCountPerPage integer Maximum number of items available to each page
last integer Last page number
lastItemNumber integer Absolute number of the last item on this page
lastPageInRange integer Last page in the range returned by the scrolling style
next integer Next page number
pageCount integer Number of pages
pagesInRange array Array of pages returned by the scrolling style
previous integer Previous page number
totalItemCount integer Total number of items
Previous Next
Introducción a Zend Framework
Descripción general
Instalación
Aprendiendo Zend Framework
Inicio Rápido con Zend Framework
Zend Framework & MVC Introduction
Create Your Project
Create A Layout
Create a Model and Database Table
Create A Form
Congratulations!
Autocarga o Carga automática en Zend Framework
Introduction
Goals and Design
Basic Autoloader Usage
Resource Autoloading
Conclusion
Plugins en Zend Framework
Introduction
Using Plugins
Conclusion
Primeros pasos con Zend_Layout
Introduction
Using Zend_Layout
Zend_Layout: Conclusions
Introducción a Zend_View Placeholders
Introduction
Basic Placeholder Usage
Standard Placeholders
View Placeholders: Conclusion
Comprensión y uso de Zend Form Decorators
Introduction
Decorator Basics
Layering Decorators
Rendering Individual Decorators
Creating and Rendering Composite Elements
Conclusion
Primeros pasos con Zend_Session, Zend_Auth, and Zend_Acl
Building Multi-User Applications With Zend Framework
Managing User Sessions In ZF
Authenticating Users in Zend Framework
Building an Authorization System in Zend Framework
Primeros pasos con Zend_Search_Lucene
Zend_Search_Lucene Introduction
Lucene Index Structure
Index Opening and Creation
Indexing
Searching
Supported queries
Search result pagination
Primeros pasos con Zend_Paginator
Introduction
Simple Examples
Pagination Control and ScrollingStyles
Putting it all Together
Referencia de Zend Framework
Zend_Acl
Introducción
Perfeccionamiento de los controles de acceso
Uso Avanzado
Zend_Amf
Introducción
Zend_Amf_Server
Zend_Application
Introducción
Inicio rápido con Zend_Application
Teoría de Operación
Ejemplos
Funcionalidad Básica
Plugins de Recursos Disponibles
Zend_Auth
Introducción
Tabla de base de datos de autenticación
Autenticación "Digest"
Adaptador de Autenticación HTTP
LDAP Authentication
Autenticación con Open ID
Zend_Barcode
Introduction
Barcode creation using Zend_Barcode class
Zend_Barcode Objects
Zend_Barcode Renderers
Zend_Cache
Introducción
The Theory of Caching
Zend_Cache Frontends
Zend_Cache Backends
The Cache Manager
Zend_Captcha
Introducción
Captcha Operation
CAPTCHA Adapters
Zend_CodeGenerator
Introducción
Ejemplos de Zend_CodeGenerator
Referencias de Zend_CodeGenerator
Zend_Config
Introducción
Aspectos Teóricos
Zend_Config_Ini
Zend_Config_Xml
Zend_Config_Writer
Zend_Config_Writer
Zend_Console_Getopt
Introduction
Declaring Getopt Rules
Fetching Options and Arguments
Configuring Zend_Console_Getopt
Zend_Controller
Inicio rápido a Zend_Controller
Conceptos Básicos de Zend_Controller
El Front Controller
La solicitud del Objeto
El Router Standard
El Despachador
Controladores de Acción
Action Helpers
The Response Object
Plugins
Using a Conventional Modular Directory Structure
Excepciones MVC
Zend_Currency
Introduction to Zend_Currency
Using Zend_Currency
Options for currencies
What makes a currency?
Where is the currency?
How does the currency look like?
How much is my currency?
Calculating with currencies
Exchanging currencies
Additional informations on Zend_Currency
Zend_Date
Introducción
Theory of Operation
Basic Methods
Zend_Date API Overview
Creation of Dates
Constants for General Date Functions
Working Examples
Zend_Db
Zend_Db_Adapter
Zend_Db_Statement
Zend_Db_Profiler
Zend_Db_Select
Zend_Db_Table
Zend_Db_Table_Row
Zend_Db_Table_Rowset
Zend_Db_Table Relationships
Zend_Db_Table_Definition
Zend_Debug
Mostrar información de variables(Dumping Variables)
Zend_Dojo
Introducción
Zend_Dojo_Data: Envolturas de dojo.data
Ayudantes de Dojo View
Elementos y Decoradores de Dojo Form
Zend_Dojo build layer support
Zend_Dom
Introducción
Zend_Dom_Query
Zend_Exception
Uso de Excepciones
Basic usage
Previous Exceptions
Zend_Feed
Introduction
Importing Feeds
Retrieving Feeds from Web Pages
Consuming an RSS Feed
Consuming an Atom Feed
Consuming a Single Atom Entry
Modifying Feed and Entry structures
Custom Feed and Entry Classes
Zend_Feed_Reader
Zend_Feed_Writer
Zend_Feed_Pubsubhubbub
Zend_File
Zend_File_Transfer
Validators for Zend_File_Transfer
Filters for Zend_File_Transfer
Zend_Filter
Introducción
Standard Filter Classes
Filter Chains
Writing Filters
Zend_Filter_Input
Zend_Filter_Inflector
Zend_Form
Zend_Form
Inicio rápido a Zend_Form
Creando elementos de formulario usando Zend_Form_Element
Creando formularios usando Zend_Form
Creando un personalizado marcado de formulario usando Zend_Form_Decorator
Elementos Enviados en el Formulario Estandard de Zend Framework
Decoradores de Formulario (Form Decorartors) estándar contenidos en Zend Framework
Internacionalización de Zend_Form
Uso avanzado de Zend_Form
Zend_Gdata
Introduction
Authenticating with AuthSub
Using the Book Search Data API
Authenticating with ClientLogin
Using Google Calendar
Using Google Documents List Data API
Using Google Health
Using Google Spreadsheets
Using Google Apps Provisioning
Using Google Base
Using Picasa Web Albums
Using the YouTube Data API
Catching Gdata Exceptions
Zend_Http
Introduction
Zend_Http_Client - Advanced Usage
Zend_Http_Client - Connection Adapters
Zend_Http_Cookie and Zend_Http_CookieJar
Zend_Http_Response
Zend_InfoCard
Introduction
Zend_Json
Introducción
Uso Básico
Uso Avanzado de Zend_Json
Conversión de XML a JSON
Zend_Json_Server - servidor JSON-RPC
Zend_Layout
Introducción
Zend_Layout Quick Start
Zend_Layout Configuration Options
Zend_Layout Advanced Usage
Zend_Ldap
Introduction
API overview
Usage Scenarios
Tools
Object oriented access to the LDAP tree using Zend_Ldap_Node
Getting information from the LDAP server
Serializing LDAP data to and from LDIF
Zend_Loader
Cargando archivos y clases dinámicamente
The Autoloader
Resource Autoloaders
Loading Plugins
Zend_Locale
Introduction
Using Zend_Locale
Normalization and Localization
Working with Dates and Times
Supported locales
Zend_Log
Overview
Writers
Formatters
Filters
Using the Factory to Create a Log
Zend_Mail
Introduction
Sending via SMTP
Sending Multiple Mails per SMTP Connection
Using Different Transports
HTML E-Mail
Attachments
Adding Recipients
Controlling the MIME Boundary
Additional Headers
Character Sets
Encoding
SMTP Authentication
Securing SMTP Transport
Reading Mail Messages
Zend_Markup
Introduction
Getting Started With Zend_Markup
Zend_Markup Parsers
Zend_Markup Renderers
Zend_Measure
Introduction
Creation of Measurements
Outputting measurements
Manipulating Measurements
Types of measurements
Zend_Memory
Overview
Memory Manager
Memory Objects
Zend_Mime
Zend_Mime
Zend_Mime_Message
Zend_Mime_Part
Zend_Navigation
Introduction
Pages
Containers
Zend_Oauth
Introduction to OAuth
Zend_OpenId
Introduction
Zend_OpenId_Consumer Basics
Zend_OpenId_Provider
Zend_Paginator
Introduction
Usage
Configuration
Advanced usage
Zend_Pdf
Introducción
Creando y Cargando Documentos PDF
Guardar Cambios a Documentos PDF
Trabajando con Páginas
Dibujo
Interactive Features
Información del Documento y Metadatos
Ejemplo de Uso del módulo Zend_Pdf
Zend_ProgressBar
Zend_ProgressBar
Zend_Queue
Introduction
Example usage
Framework
Adapters
Customizing Zend_Queue
Stomp
Zend_Reflection
Introduction
Zend_Reflection Examples
Zend_Reflection Reference
Zend_Registry
Using the Registry
Zend_Rest
Introduction
Zend_Rest_Client
Zend_Rest_Server
Zend_Search_Lucene
Overview
Building Indexes
Searching an Index
Query Language
Query Construction API
Character Set
Extensibility
Interoperating with Java Lucene
Advanced
Best Practices
Zend_Serializer
Introduction
Zend_Serializer_Adapter
Zend_Server
Introduction
Zend_Server_Reflection
Zend_Service
Introduction
Zend_Service_Akismet
Zend_Service_Amazon
Zend_Service_Amazon_Ec2
Zend_Service_Amazon_Ec2: Instances
Zend_Service_Amazon_Ec2: Windows Instances
Zend_Service_Amazon_Ec2: Reserved Instances
Zend_Service_Amazon_Ec2: CloudWatch Monitoring
Zend_Service_Amazon_Ec2: Amazon Machine Images (AMI)
Zend_Service_Amazon_Ec2: Elastic Block Storage (EBS)
Zend_Service_Amazon_Ec2: Elastic IP Addresses
Zend_Service_Amazon_Ec2: Keypairs
Zend_Service_Amazon_Ec2: Regions and Availability Zones
Zend_Service_Amazon_Ec2: Security Groups
Zend_Service_Amazon_S3
Zend_Service_Amazon_Sqs
Zend_Service_Audioscrobbler
Zend_Service_Delicious
Zend_Service_DeveloperGarden
Zend_Service_Flickr
Zend_Service_LiveDocx
Zend_Service_Nirvanix
Zend_Service_ReCaptcha
Zend_Service_Simpy
Zend_Service_SlideShare
Zend_Service_StrikeIron
Zend_Service_StrikeIron: Bundled Services
Zend_Service_StrikeIron: Advanced Uses
Zend_Service_Technorati
Zend_Service_Twitter
Zend_Service_WindowsAzure
Zend_Service_Yahoo
Zend_Session
Introduction
Basic Usage
Advanced Usage
Global Session Management
Zend_Session_SaveHandler_DbTable
Zend_Soap
Zend_Soap_Server
Zend_Soap_Client
WSDL Accessor
AutoDiscovery
Zend_Tag
Introduction
Zend_Tag_Cloud
Zend_Test
Introducción
Zend_Test_PHPUnit
Zend_Test_PHPUnit_Db
Zend_Text
Zend_Text_Figlet
Zend_Text_Table
Zend_TimeSync
Introduction
Working with Zend_TimeSync
Zend_Tool
Using Zend_Tool On The Command Line
Extending Zend_Tool
Zend_Tool_Framework
Introduction
Usando la herramienta CLI
Architecture
Creando Proveedores para usar con Zend_Tool_Framework
Shipped System Providers
Extending and Configuring Zend_Tool_Framework
Zend_Tool_Project
Introduction
Create A Project
Zend_Tool Project Providers
Zend_Tool_Project Internos
Zend_Translate
Introduction
Adapters for Zend_Translate
Using Translation Adapters
Creating source files
Additional features for translation
Plural notations for Translation
Zend_Uri
Zend_Uri
Zend_Validate
Introducción
Clases de Validación Estándar
Cadenas de Validadores
Escribiendo Validadores
Validation Messages
Zend_Version
Obteniendo la versión de Zend Framework Version
Zend_View
Introduction
Controller Scripts
View Scripts
View Helpers
Zend_View_Abstract
Zend_Wildfire
Zend_Wildfire
Zend_XmlRpc
Introducción
Zend_XmlRpc_Client
Zend_XmlRpc_Server
ZendX_Console_Process_Unix
ZendX_Console_Process_Unix
ZendX_JQuery
Introduction
ZendX_JQuery View Helpers
ZendX_JQuery Form Elements and Decorators
Requisitos de Zend Framework
Versión de PHP
Extensiones de PHP
Componentes de Zend Framework
Dependencias de Zend Framework
Notas de Migración de Zend Framework
Zend Framework 1.10
Zend Framework 1.9
Zend Framework 1.8
Zend Framework 1.7
Zend Framework 1.6
Zend Framework 1.5
Zend Framework 1.0
Zend Framework 0.9
Zend Framework 0.8
Zend Framework 0.6
Estándares de codificación de Zend Framework para PHP
Introducción
Formato de archivos PHP
Convenciones de Nombres
Estilo de código
Zend Framework Documentation Standard
Overview
Documentation File Formatting
Recommendations
Recommended Project Structure for Zend Framework MVC Applications
Overview
Recommended Project Directory Structure
Module Structure
Rewrite Configuration Guide
Guía de Rendimiento de Zend Framework
Introduction
Class Loading
Zend_Db Performance
Internationalization (i18n) and Localization (l10n)
View Rendering
Copyright Information