212 lines
10 KiB
HTML
212 lines
10 KiB
HTML
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<title>Template Parser Class : CodeIgniter User Guide</title>
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<td><h1>CodeIgniter User Guide Version 2.1.3</h1></td>
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<td id="breadcrumb_right"><a href="../toc.html">Table of Contents Page</a></td>
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<a href="http://codeigniter.com/">CodeIgniter Home</a> ›
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<a href="../index.html">User Guide Home</a> ›
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Template Parser Class
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<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>
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<h1>Template Parser Class</h1>
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<p>The Template Parser Class enables you to parse pseudo-variables contained within your view files. It can parse simple
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variables or variable tag pairs. If you've never used a template engine, pseudo-variables look like this:</p>
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<code><html><br />
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<head><br />
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<title><kbd>{blog_title}</kbd></title><br />
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</head><br />
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<body><br />
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<br />
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<h3><kbd>{blog_heading}</kbd></h3><br />
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<br />
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<kbd>{blog_entries}</kbd><br />
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<h5><kbd>{title}</kbd></h5><br />
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<p><kbd>{body}</kbd></p><br />
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<kbd>{/blog_entries}</kbd><br />
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</body><br />
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</html></code>
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<p>These variables are not actual PHP variables, but rather plain text representations that allow you to eliminate
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PHP from your templates (view files).</p>
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<p class="important"><strong>Note:</strong> CodeIgniter does <strong>not</strong> require you to use this class
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since using pure PHP in your view pages lets them run a little faster. However, some developers prefer to use a template engine if
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they work with designers who they feel would find some confusion working with PHP.</p>
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<p><strong>Also Note:</strong> The Template Parser Class is <strong>not</strong> a
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full-blown template parsing solution. We've kept it very lean on purpose in order to maintain maximum performance.</p>
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<h2>Initializing the Class</h2>
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<p>Like most other classes in CodeIgniter, the Parser class is initialized in your controller using the <dfn>$this->load->library</dfn> function:</p>
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<code>$this->load->library('parser');</code>
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<p>Once loaded, the Parser library object will be available using: <dfn>$this->parser</dfn></p>
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<p>The following functions are available in this library:</p>
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<h2>$this->parser->parse()</h2>
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<p>This method accepts a template name and data array as input, and it generates a parsed version. Example:</p>
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<code>$this->load->library('parser');<br />
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<br />
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$data = array(<br />
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'blog_title' => 'My Blog Title',<br />
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'blog_heading' => 'My Blog Heading'<br />
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);<br />
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<br />
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$this->parser->parse('blog_template', $data);</code>
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<p>The first parameter contains the name of the <a href="../general/views.html">view file</a> (in this example the file would be called blog_template.php),
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and the second parameter contains an associative array of data to be replaced in the template. In the above example, the
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template would contain two variables: {blog_title} and {blog_heading}</p>
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<p>There is no need to "echo" or do something with the data returned by <dfn>$this->parser->parse()</dfn>. It is automatically
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passed to the output class to be sent to the browser. However, if you do want the data returned instead of sent to the output class you can
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pass TRUE (boolean) to the third parameter:</p>
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<code>$string = $this->parser->parse('blog_template', $data, TRUE);</code>
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<h2>$this->parser->parse_string()</h2>
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<p>This method works exactly like parse(), only accepts a string as the first parameter in place of a view file.</p>
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<h2>Variable Pairs</h2>
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<p>The above example code allows simple variables to be replaced. What if you would like an entire block of variables to be
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repeated, with each iteration containing new values? Consider the template example we showed at the top of the page:</p>
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<code><html><br />
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<head><br />
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<title><kbd>{blog_title}</kbd></title><br />
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</head><br />
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<body><br />
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<br />
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<h3><kbd>{blog_heading}</kbd></h3><br />
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<br />
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<kbd>{blog_entries}</kbd><br />
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<h5><kbd>{title}</kbd></h5><br />
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<p><kbd>{body}</kbd></p><br />
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<kbd>{/blog_entries}</kbd><br />
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</body><br />
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</html></code>
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<p>In the above code you'll notice a pair of variables: <kbd>{blog_entries}</kbd> data... <kbd>{/blog_entries}</kbd>.
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In a case like this, the entire chunk of data between these pairs would be repeated multiple times, corresponding
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to the number of rows in a result.</p>
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<p>Parsing variable pairs is done using the identical code shown above to parse single variables,
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except, you will add a multi-dimensional array corresponding to your variable pair data.
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Consider this example:</p>
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<code>$this->load->library('parser');<br />
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<br />
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$data = array(<br />
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'blog_title' => 'My Blog Title',<br />
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'blog_heading' => 'My Blog Heading',<br />
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'blog_entries' => array(<br />
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array('title' => 'Title 1', 'body' => 'Body 1'),<br />
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array('title' => 'Title 2', 'body' => 'Body 2'),<br />
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array('title' => 'Title 3', 'body' => 'Body 3'),<br />
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array('title' => 'Title 4', 'body' => 'Body 4'),<br />
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array('title' => 'Title 5', 'body' => 'Body 5')<br />
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)<br />
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);<br />
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<br />
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$this->parser->parse('blog_template', $data);</code>
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<p>If your "pair" data is coming from a database result, which is already a multi-dimensional array, you can simply
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use the database result_array() function:</p>
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<code>
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$query = $this->db->query("SELECT * FROM blog");<br />
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<br />
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$this->load->library('parser');<br />
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<br />
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$data = array(<br />
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'blog_title' => 'My Blog Title',<br />
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'blog_heading' => 'My Blog Heading',<br />
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'blog_entries' => $query->result_array()<br />
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);<br />
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<br />
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$this->parser->parse('blog_template', $data);</code>
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</div>
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<p>
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Previous Topic: <a href="trackback.html">Trackback Class</a>
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<a href="#top">Top of Page</a> ·
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<a href="../index.html">User Guide Home</a> ·
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</p>
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<p><a href="http://codeigniter.com">CodeIgniter</a> · Copyright © 2006 - 2012 · <a href="http://ellislab.com/">EllisLab, Inc.</a></p>
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