diff options
| author | Joël Cox <joel@joelcox.nl> | 2011-08-22 22:29:06 +0200 |
|---|---|---|
| committer | Phil Sturgeon <email@philsturgeon.co.uk> | 2011-10-27 00:43:39 +0200 |
| commit | f27bcf350d18048d91d8a607520d19f0c8e11f41 (patch) | |
| tree | b8032b1845ea2aa54e6f117a198a1ac5b573450a /user_guide/tutorial/static_pages.html | |
| parent | 6f531dc364553975a8ea4dce85927a09f6628902 (diff) | |
Cleanly applied patch of the user guide tutorial by Kenny and me.
Diffstat (limited to 'user_guide/tutorial/static_pages.html')
| -rw-r--r-- | user_guide/tutorial/static_pages.html | 206 |
1 files changed, 206 insertions, 0 deletions
diff --git a/user_guide/tutorial/static_pages.html b/user_guide/tutorial/static_pages.html new file mode 100644 index 000000000..69e5b7446 --- /dev/null +++ b/user_guide/tutorial/static_pages.html @@ -0,0 +1,206 @@ +<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> +<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en"> +<head> + +<meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> +<title>CodeIgniter Features : CodeIgniter User Guide</title> + +<style type='text/css' media='all'>@import url('../userguide.css');</style> +<link rel='stylesheet' type='text/css' media='all' href='../userguide.css' /> + +<script type="text/javascript" src="../nav/nav.js"></script> +<script type="text/javascript" src="../nav/prototype.lite.js"></script> +<script type="text/javascript" src="../nav/moo.fx.js"></script> +<script type="text/javascript" src="../nav/user_guide_menu.js"></script> + +<meta http-equiv='expires' content='-1' /> +<meta http-equiv= 'pragma' content='no-cache' /> +<meta name='robots' content='all' /> +<meta name='author' content='ExpressionEngine Dev Team' /> +<meta name='description' content='CodeIgniter User Guide' /> + +</head> +<body> + +<!-- START NAVIGATION --> +<div id="nav"><div id="nav_inner"><script type="text/javascript">create_menu('../');</script></div></div> +<div id="nav2"><a name="top"></a><a href="javascript:void(0);" onclick="myHeight.toggle();"><img src="../images/nav_toggle_darker.jpg" width="154" height="43" border="0" title="Toggle Table of Contents" alt="Toggle Table of Contents" /></a></div> +<div id="masthead"> +<table cellpadding="0" cellspacing="0" border="0" style="width:100%"> +<tr> +<td><h1>CodeIgniter User Guide Version 2.0.2</h1></td> +<td id="breadcrumb_right"><a href="../toc.html">Table of Contents Page</a></td> +</tr> +</table> +</div> +<!-- END NAVIGATION --> + + +<!-- START BREADCRUMB --> +<table cellpadding="0" cellspacing="0" border="0" style="width:100%"> +<tr> +<td id="breadcrumb"> +<a href="http://codeigniter.com/">CodeIgniter Home</a> › +<a href="../index.html">User Guide Home</a> › +<a href="introduction.html">Tutorial</a> › +Static pages +</td> +<td id="searchbox"><form method="get" action="http://www.google.com/search"><input type="hidden" name="as_sitesearch" id="as_sitesearch" value="codeigniter.com/user_guide/" />Search User Guide <input type="text" class="input" style="width:200px;" name="q" id="q" size="31" maxlength="255" value="" /> <input type="submit" class="submit" name="sa" value="Go" /></form></td> +</tr> +</table> +<!-- END BREADCRUMB --> + +<br clear="all" /> + + +<!-- START CONTENT --> +<div id="content"> + + +<h1>Tutorial − Static pages</h1> + +<p class="important"><strong>Note:</strong> This tutorial assumes you've downloaded CodeIgniter and <a href="../installation/index.html">installed the framework</a> in your development environment.</p> + +<p>The first thing you're going to do is set up a <strong>controller</strong> to handle static pages. +A controller is simply a class that helps delegate work. It is the glue of your +web application.</p> + +<p>For example, when a call is made to: <code>http://example.com/news/latest/10</code> We might imagine +that there is a controller named "news". The method being called on news +would be "latest". The news method's job could be to grab 10 +news items, and render them on the page. Very often in MVC, you'll see URL +patterns that match: <code>http://example.com/[controller-class]/[controller-method]/[arguments]</code> +As URL schemes become more complex, this may change. But for now, this is all we will need to know.</p> + +<p>Create a file at <dfn>application/controllers/pages.php</dfn> with the following code.</p> + +<textarea class="textarea" style="width:100%" cols="50" rows="10"> +<?php + +class Pages extends CI_Controller { + + function view($page = 'home') + { + + } +} +</textarea> + +<p>You have created a class named "pages", with a view method that accepts one argument named <var>$page</var>. +The pages class is extending the CI_Controller class. +This means that the new pages class can access the methods and variables defined in the CI_Controller class +(<dfn>system/core/Controller.php</dfn>).</p> + +<p>The <strong>controller is what will become the center of every request</strong> to your web application. +In very technical CodeIgniter discussions, it may be referred to as the <em>super object</em>. +Like any php class, you refer to it within your controllers as <var>$this</var>. +Referring to <var>$this</var> is how you will load libraries, views, and generally +command the framework.</p> + +<p>Now you've created your first method, it's time to make some basic page templates. +We will be creating two "views" (page templates) that act as our page footer and header.</p> + +<p>Create the header at <dfn>application/views/templates/header.php</dfn> and add the following code.</p> + +<textarea class="textarea" style="width:100%" cols="50" rows="8"> +<html> +<head> + <title><?php echo $title ?> - CodeIgniter 2 Tutorial</title> +</head> +<body> + <h1>CodeIgniter 2 Tutorial</h1> + +</textarea> + +<p>The header contains the basic HTML code that you'll want to display before loading the main view, together with a heading. +It will also output the <var>$title</var> variable, which we'll define later in the controller. +Now create a footer at <dfn>application/views/templates/footer.php</dfn> that includes the following code:</p> + +<textarea class="textarea" style="width:100%" cols="50" rows="4"> +<strong>&copy; 2011</strong> +</body> +</html> +</textarea> + +<h2>Adding logic to the controller</h2> + +<p>Earlier you set up a controller with a view() method. The method accepts one parameter, which is the name of the page to be loaded. +The static page templates will be located in the <dfn>application/views/pages/</dfn> directory.</p> + +<p>In that directory, create two files named <dfn>home.php</dfn> and <dfn>about.php</dfn>. +Within those files, type some text − anything you'd like − and save them. +If you like to be particularly un-original, try "Hello World!".</p> + +<p>In order to load those pages, you'll have to check whether the requested page actually exists:</p> + +<pre> +function view($page = 'home') +{ + + if ( ! file_exists('application/views/pages/' . $page . EXT)) + { + // Whoops, we don't have a page for that! + show_404(); + } + + $data['title'] = ucfirst($page); // Capitalize the first letter + + $this->load->view('templates/header', $data); + $this->load->view('pages/' . $page, $data); + $this->load->view('templates/footer', $data); + +} +</pre> + +<p>Now, when the page does exist, it is loaded, including the header and footer, and displayed to the user. If the page doesn't exist, a "404 Page not found" error is shown.</p> + +<p>The first line in this method checks whether the page actually exists. PHP's native <var>file_exists()</var> function is used to check whether the file is where it's expected to be. <var>show_404()</var> is a built-in CodeIgniter function that renders the default error page.</p> + +<p>In the header template, the <var>$title</var> variable was used to customize the page title. The value of title is defined in this method, but instead of assigning the value to a variable, it is assigned to the title element in the <var>$data</var> array.</p> + +<p>The last thing that has to be done is loading the views in the order they should be displayed. +The second parameter in the <var>view()</var> method is used to pass values to the view. Each value in the <var>$data</var> array is assigned to a variable with the name of its key. So the value of <var>$data['title']</var> in the controller is equivalent to $title in the view.<p> + +<h2>Routing</h2> + +<p>The controller is now functioning! Point your browser to <dfn>[your-site-url]index.php/pages/view</dfn> to see your page. When you visit <dfn>index.php/pages/view/about</dfn> you'll see the about page, again including the header and footer.</p> + +<p>Using custom routing rules, you have the power to map any URI to any controller and method, and break free from the normal convention: +<code>http://example.com/[controller-class]/[controller-method]/[arguments]</code></p> + +<p>Let's do that. Open the routing file located at <dfn>application/config/routes.php</dfn> and add the following two lines. Remove all other code that sets any element in the <var>$route</var> array.</p> + +<pre> +$route['default_controller'] = 'pages'; +$route['(:any)'] = 'pages/view/$1'; +</pre> + +<p>CodeIgniter reads its routing rules from top to bottom and routes the request to the first matching rule. Each rule is a regular expression +(left-side) mapped to a controller and method name separated by slashes (right-side). +When a request comes in, CodeIgniter looks for the first match, and calls the appropriate controller and method, possibly with arguments.</p> + +<p>More information about routing can be found in the URI Routing <a href="../general/routing.html">documentation</a>.</p> + +<p>Here, the second rule in the <var>$routes</var> array matches <strong>any</strong> request using the wildcard string <dfn>(:any)</dfn>. +and passes the parameter to the view() method of the pages class.</p> + +<p>Now visit <dfn>index.php/about</dfn>. Did it get routed correctly to the <var>view()</var> method +in the pages controller? Awesome!</p> + +</div> +<!-- END CONTENT --> + + +<div id="footer"> +<p> +Previous Topic: <a href="introduction.html">Introduction</a> + · +<a href="#top">Top of Page</a> · +<a href="../index.html">User Guide Home</a> · +Next Topic: <a href="news_section.html">News section</a> +</p> +<p><a href="http://codeigniter.com">CodeIgniter</a> · Copyright © 2006 - 2011 · <a href="http://ellislab.com/">EllisLab, Inc.</a></p> +</div> + +</body> +</html>
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