diff options
Diffstat (limited to 'user_guide/general/views.html')
| -rw-r--r-- | user_guide/general/views.html | 249 |
1 files changed, 249 insertions, 0 deletions
diff --git a/user_guide/general/views.html b/user_guide/general/views.html new file mode 100644 index 000000000..14b03e58f --- /dev/null +++ b/user_guide/general/views.html @@ -0,0 +1,249 @@ +<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
+<html>
+<head>
+
+<title>Code Igniter 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="../scripts/nav.js"></script>
+<script type="text/javascript" src="../scripts/prototype.lite.js"></script>
+<script type="text/javascript" src="../scripts/moo.fx.js"></script>
+<script type="text/javascript">
+window.onload = function() {
+ myHeight = new fx.Height('nav', {duration: 400});
+ myHeight.hide();
+}
+</script>
+
+<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
+<meta http-equiv='expires' content='-1' />
+<meta http-equiv= 'pragma' content='no-cache' />
+<meta name='robots' content='all' />
+<meta name='author' content='Rick Ellis' />
+<meta name='description' content='Code Igniter 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.jpg" width="153" height="44" 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>Code Igniter User Guide Version 1.4.0</h1></td>
+<td id="breadcrumb_right"><a href="../toc.html">Full Table of Contents</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://www.codeigniter.com/">Code Igniter Home</a> ›
+<a href="../index.html">User Guide Home</a> ›
+Views
+</td>
+<td id="searchbox"><form method="get" action="http://www.google.com/search"><input type="hidden" name="as_sitesearch" id="as_sitesearch" value="www.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>Views</h1>
+
+<p>A <dfn>view</dfn> is simply a web page, or a page fragment, like a header, footer, sidebar, etc.
+In fact, views can flexibly be embedded within other views (within other views, etc., etc.) if you need this type
+of hierarchy.</p>
+
+<p>Views are never called directly, they must be loaded by a <a href="controllers.html">controller</a>. Remember that in an MVC framework, the Controller acts as the
+traffic cop, so it is responsible for fetching a particular view. If you have not read the <a href="controllers.html">Controllers</a> page
+you should do so before continuing.</p>
+
+<p>Using the example controller you created in the <a href="controllers.html">controller</a> page, let's add a view to it.</p>
+
+<h2>Creating a View</h2>
+
+<p>Using your text editor, create a file called <dfn>blogview.php</dfn>, and put this in it:</p>
+
+<textarea class="textarea" style="width:100%" cols="50" rows="10">
+<html>
+<head>
+<title>My Blog</title>
+</head>
+<body>
+ <h1>Welcome to my Blog!</h1>
+</body>
+</html>
+</textarea>
+
+<p>Then save the file in your <dfn>application/views/</dfn> folder.</p>
+
+<h2>Loading a View</h2>
+
+<p>To load a particular view file you will use the following function:</p>
+
+<code>$this->load->view('<var>name</var>');</code>
+
+<p>Where <var>name</var> is the name of your view file, without the .php file extension.</p>
+
+<p>Now, open the controller file you made earlier called <dfn>blog.php</dfn>, and replace the echo statement with the view loading function:</p>
+
+
+<textarea class="textarea" style="width:100%" cols="50" rows="10">
+<?php
+class Blog extends Controller {
+
+ function index()
+ {
+ $this->load->view('blogview');
+ }
+}
+?>
+</textarea>
+
+
+<p>If you visit the your site using the URL you did earlier you should see your new view. The URL was similar to this:</p>
+
+<code>www.your-site.com/index.php/<var>blog</var>/</code>
+
+
+<h2>Adding Dynamic Data to the View</h2>
+
+<p>Data is passed from the controller to the view by way of an <strong>array</strong> or an <strong>object</strong> in the second
+parameter of the view loading function. Here is an example using an array:</p>
+
+<code>$data = array(<br />
+ 'title' => 'My Title',<br />
+ 'heading' => 'My Heading'<br />
+ 'message' => 'My Message'<br />
+ );<br />
+<br />
+$this->load->view('blogview', <var>$data</var>);</code>
+
+<p>And here's an example using an object:</p>
+
+<code>$data = new Someclass();<br />
+$this->load->view('blogview', <var>$data</var>);</code>
+
+<p>Note: If you use an object, the class variables will be turned into array elements.</p>
+
+
+<p>Let's try it with your controller file. Open it add this code:</p>
+
+<textarea class="textarea" style="width:100%" cols="50" rows="14">
+<?php
+class Blog extends Controller {
+
+ function index()
+ {
+ $data['title'] = "My Real Title";
+ $data['heading'] = "My Real Heading";
+
+ $this->load->view('blogview', $data);
+ }
+}
+?>
+</textarea>
+
+
+<p>Now open your view file and change the text to variables that correspond to the array keys in your data:</p>
+
+
+<textarea class="textarea" style="width:100%" cols="50" rows="10">
+<html>
+<head>
+<title><?=$title;?></title>
+</head>
+<body>
+ <h1><?=$heading;?></h1>
+</body>
+</html>
+</textarea>
+
+<p>Then load the page at the URL you've been using and you should see the variables replaced.</p>
+
+<p><strong>Note:</strong> Youl'll notice that in the example above we are using PHP's alternative syntax. If you
+are not familiar with it you can read about it <a href="alternative_php.html">here</a>.</p>
+
+<h2>Creating Loops</h2>
+
+<p>The data array you pass to your view files is not limited to simple variables. You can
+pass multi dimensional arrays, which can be looped to generate multiple rows. For example, if you
+pull data from your database it will typically be in the form of a multi-dimensional array.</p>
+
+<p>Here's a simple example. Add this to your controller:</p>
+
+<textarea class="textarea" style="width:100%" cols="50" rows="17">
+<?php
+class Blog extends Controller {
+
+ function index()
+ {
+ $data['todo_list'] = array('Clean House', 'Call Mom', 'Run Errands');
+
+ $data['title'] = "My Real Title";
+ $data['heading'] = "My Real Heading";
+
+ $this->load->view('blogview', $data);
+ }
+}
+?>
+</textarea>
+
+
+<p>Now open your view file and create a loop:</p>
+
+
+<textarea class="textarea" style="width:100%" cols="50" rows="24">
+<html>
+<head>
+<title><?=$title;?></title>
+</head>
+<body>
+<h1><?=$heading;?></h1>
+
+<h3>My Todo List</h3>
+
+<ul>
+<?php foreach($todo_list as $item):?>
+
+<li><?=$item;?></li>
+
+<?php endforeach;?>
+</ul>
+
+
+</body>
+</html>
+</textarea>
+
+
+
+</div>
+<!-- END CONTENT -->
+
+
+<div id="footer">
+<p>
+Previous Topic: <a href="controllers.html">Controllers</a>
+ ·
+<a href="#top">Top of Page</a> ·
+<a href="../index.html">User Guide Home</a> ·
+Next Topic: <a href="models.html">Models</a>
+<p>
+<p><a href="http://www.codeigniter.com">Code Igniter</a> · Copyright © 2006 · <a href="http://www.pmachine.com">pMachine, Inc.</a></p>
+</div>
+
+</body>
+</html>
\ No newline at end of file |