Zend Framework: A Beginner s Guide in Visual C#.NET

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Zend Framework: A Beginner s Guide
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at the top level of the navigational hierarchy, and each page has a title and URL Each page may itself contain further child pages; these too are expressed as Zend_Navigation_Page objects and attached to their parent as a nested array This hierarchical structure can easily be extended to cover the entire surface area of a Web site Page objects are themselves created as instances of either the Zend_Navigation_Page_Mvc class or the Zend_Navigation_Page_Uri class, both of which extend the abstract Zend_ Navigation_Page class The difference between the two arises from the manner in which the page link is defined: The former piggybacks on the Zend Framework s router by specifying each page s module, action, and controller, while the latter directly specifies the page link as a URL The following example illustrates the difference:
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< php class Sandbox_ExampleController extends Zend_Controller_Action { function pageAction() { // define MVC page $page = Zend_Navigation_Page::factory(array( 'label' => 'Contact Us', 'module' => 'default', 'controller' => 'contact', 'action' => 'index', )); // define URI page $page = Zend_Navigation_Page::factory(array( 'label' => 'Contact Us', 'uri' => '/contact', )); } }
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Each page object exposes a number of getter and setter methods, which can be used to set page properties For example, the label, forward relationships, reverse relationships, and visibility can all be set with the page object s setLabel(), setRel(), setRev(), and setVisibility() methods, respectively, and they can be retrieved with the corresponding getLabel(), getRel(), getRev(), and getVisibility() methods There s also the isActive() method, which returns a Boolean value indicating whether or not the page matches the current request
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In most cases, it is preferable to specify page objects as Zend_Navigation_Page_Uri instances Not only are the corresponding URLs somewhat easier to read and understand, but the flexible nature of these objects means that they can also be used to create links to external or third-party resources Zend_Navigation_Page_Mvc objects,
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Working with User Interface Elements
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on the other hand, must be mapped by the Zend Framework router and so can only be used to create links to internal application resources
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The Zend_Navigation container can be initialized, as shown previously, with an array of Zend_Navigation_Page objects For long or complex navigational structures, however, this method can be somewhat unwieldy, so a Zend_Navigation container can also be initialized with a Zend_Config object, with the navigation configuration expressed as either an XML document or an INI file Consider the following example, which illustrates one such XML document:
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< xml version="10" encoding="UTF-8" > <config> <home> <label>Home</label> <uri>/home</uri> </home> <products> <label>Products</label> <uri>/products</uri> <pages> <men> <label>Men</label> <uri>/products/men</uri> <pages> <item_1> <label>Dress Shirts</label> <uri>/products/men/16339</uri> </item_1> <item_2> <label>Trousers</label> <uri>/products/men/85940</uri> </item_2> <item_3> <label>Shoes</label> <uri>/products/men/75393</uri> </item_3> </pages> </men> <women> <label>Women</label> <uri>/products/women</uri> <pages> <item_1> <label>Skirts and Dresses</label> <uri>/products/women/75849</uri> </item_1> <item_2> <label>Bags</label> <uri>/products/women/64830</uri>
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Zend Framework: A Beginner s Guide
</item_2> <item_3> <label>Shoes</label> <uri>/products/women/58303</uri> </item_3> </pages> </women> </pages> </products> <about> <label>About Us</label> <uri>/about</uri> <pages> <history> <label>Company History</label> <uri>/about/history</uri> </history> <team> <label>Management Team</label> <uri>/about/team</uri> </team> <awards> <label>Awards</label> <uri>/about/awards</uri> </awards> </pages> </about> <feedback> <label>Feedback</label> <uri>/feedback</uri> </feedback> </config>
This XML document can be read into a Zend_Navigation container using Zend_Config, as follows:
< php class Sandbox_ExampleController extends Zend_Controller_Action { function navAction() { // initialize navigation container from XML file $config = new Zend_Config_Xml(APPLICATION_PATH '/configs/sitexml'); $container = new Zend_Navigation($config); } }
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Zend_Navigation is fully locale-aware, and will automatically translate labels into locallanguage equivalents, given a correctly configured Zend_Translate object You can read more about Zend_Translate in 9
It s easy to iterate over a Zend_Navigation container with the RecursiveIteratorIterator, retrieving the contents of individual Zend_Navigation_Page objects Here s an example:
< php class Sandbox_ExampleController extends Zend_Controller_Action { function navAction() { // initialize navigation container $config = new Zend_Config_Xml(APPLICATION_PATH '/configs/sitexml'); $container = new Zend_Navigation($config); // iterate over container // display page information foreach (new RecursiveIteratorIterator( $container, RecursiveIteratorIterator::CHILD_FIRST) as $page) { echo $page->getLabel(); } } }
The Zend_Navigation container also exposes various methods for interacting with the pages contained within it In particular, it exposes the findBy() search method, which can be used to retrieve all pages matching specific criteria Consider the following example, which illustrates this:
< php class Sandbox_ExampleController extends Zend_Controller_Action { function navAction() { // initialize navigation container $config = new Zend_Config_Xml(APPLICATION_PATH '/configs/sitexml'); $container = new Zend_Navigation($config); // find all pages with matching URLs $container->findBy('uri', '/about'); } }
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