685 lines
54 KiB
HTML
Executable File
685 lines
54 KiB
HTML
Executable File
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<!DOCTYPE html>
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<!--[if IE 8]><html class="no-js lt-ie9" lang="en" > <![endif]-->
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<!--[if gt IE 8]><!--> <html class="no-js" lang="en" > <!--<![endif]-->
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<head>
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<meta charset="utf-8">
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<meta name="viewport" content="width=device-width, initial-scale=1.0">
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<title>News section — CodeIgniter 3.1.11 documentation</title>
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<link rel="shortcut icon" href="../_static/ci-icon.ico"/>
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<link href='https://fonts.googleapis.com/css?family=Lato:400,700,400italic,700italic|Roboto+Slab:400,700|Inconsolata:400,700&subset=latin,cyrillic' rel='stylesheet' type='text/css'>
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<link rel="stylesheet" href="../_static/css/citheme.css" type="text/css" />
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<link rel="index" title="Index"
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href="../genindex.html"/>
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<link rel="search" title="Search" href="../search.html"/>
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<link rel="top" title="CodeIgniter 3.1.11 documentation" href="../index.html"/>
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<link rel="up" title="Tutorial" href="index.html"/>
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<link rel="next" title="Create news items" href="create_news_items.html"/>
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<link rel="prev" title="Static pages" href="static_pages.html"/>
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<script src="https://cdnjs.cloudflare.com/ajax/libs/modernizr/2.6.2/modernizr.min.js"></script>
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</head>
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<body class="wy-body-for-nav" role="document">
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<div id="nav">
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<div id="nav_inner">
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<div id="pulldown-menu" class="ciNav">
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<ul>
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<li class="toctree-l1"><a class="reference internal" href="../general/welcome.html">Welcome to CodeIgniter</a></li>
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</ul>
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<ul>
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<li class="toctree-l1"><a class="reference internal" href="../installation/index.html">Installation Instructions</a><ul>
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<li class="toctree-l2"><a class="reference internal" href="../installation/downloads.html">Downloading CodeIgniter</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../installation/index.html">Installation Instructions</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../installation/upgrading.html">Upgrading From a Previous Version</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../installation/troubleshooting.html">Troubleshooting</a></li>
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</ul>
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</li>
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</ul>
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<ul>
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<li class="toctree-l1"><a class="reference internal" href="../overview/index.html">CodeIgniter Overview</a><ul>
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<li class="toctree-l2"><a class="reference internal" href="../overview/getting_started.html">Getting Started</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../overview/at_a_glance.html">CodeIgniter at a Glance</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../overview/features.html">Supported Features</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../overview/appflow.html">Application Flow Chart</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../overview/mvc.html">Model-View-Controller</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../overview/goals.html">Architectural Goals</a></li>
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</ul>
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</li>
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</ul>
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<ul class="current">
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<li class="toctree-l1 current"><a class="reference internal" href="index.html">Tutorial</a><ul class="current">
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<li class="toctree-l2"><a class="reference internal" href="static_pages.html">Static pages</a></li>
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<li class="toctree-l2 current"><a class="current reference internal" href="#">News section</a></li>
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<li class="toctree-l2"><a class="reference internal" href="create_news_items.html">Create news items</a></li>
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<li class="toctree-l2"><a class="reference internal" href="conclusion.html">Conclusion</a></li>
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</ul>
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</li>
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</ul>
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<ul>
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<li class="toctree-l1"><a class="reference internal" href="../contributing/index.html">Contributing to CodeIgniter</a><ul>
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<li class="toctree-l2"><a class="reference internal" href="../documentation/index.html">Writing CodeIgniter Documentation</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../DCO.html">Developer’s Certificate of Origin 1.1</a></li>
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</ul>
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</li>
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</ul>
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<ul>
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<li class="toctree-l1"><a class="reference internal" href="../general/index.html">General Topics</a><ul>
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<li class="toctree-l2"><a class="reference internal" href="../general/urls.html">CodeIgniter URLs</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../general/controllers.html">Controllers</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../general/reserved_names.html">Reserved Names</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../general/views.html">Views</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../general/models.html">Models</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../general/helpers.html">Helpers</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../general/libraries.html">Using CodeIgniter Libraries</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../general/creating_libraries.html">Creating Libraries</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../general/drivers.html">Using CodeIgniter Drivers</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../general/creating_drivers.html">Creating Drivers</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../general/core_classes.html">Creating Core System Classes</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../general/ancillary_classes.html">Creating Ancillary Classes</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../general/hooks.html">Hooks - Extending the Framework Core</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../general/autoloader.html">Auto-loading Resources</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../general/common_functions.html">Common Functions</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../general/compatibility_functions.html">Compatibility Functions</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../general/routing.html">URI Routing</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../general/errors.html">Error Handling</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../general/caching.html">Caching</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../general/profiling.html">Profiling Your Application</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../general/cli.html">Running via the CLI</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../general/managing_apps.html">Managing your Applications</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../general/environments.html">Handling Multiple Environments</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../general/alternative_php.html">Alternate PHP Syntax for View Files</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../general/security.html">Security</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../general/styleguide.html">PHP Style Guide</a></li>
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</ul>
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</li>
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</ul>
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<ul>
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<li class="toctree-l1"><a class="reference internal" href="../libraries/index.html">Libraries</a><ul>
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<li class="toctree-l2"><a class="reference internal" href="../libraries/benchmark.html">Benchmarking Class</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../libraries/caching.html">Caching Driver</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../libraries/calendar.html">Calendaring Class</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../libraries/cart.html">Shopping Cart Class</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../libraries/config.html">Config Class</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../libraries/email.html">Email Class</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../libraries/encrypt.html">Encrypt Class</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../libraries/encryption.html">Encryption Library</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../libraries/file_uploading.html">File Uploading Class</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../libraries/form_validation.html">Form Validation</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../libraries/ftp.html">FTP Class</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../libraries/image_lib.html">Image Manipulation Class</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../libraries/input.html">Input Class</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../libraries/javascript.html">Javascript Class</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../libraries/language.html">Language Class</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../libraries/loader.html">Loader Class</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../libraries/migration.html">Migrations Class</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../libraries/output.html">Output Class</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../libraries/pagination.html">Pagination Class</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../libraries/parser.html">Template Parser Class</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../libraries/security.html">Security Class</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../libraries/sessions.html">Session Library</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../libraries/table.html">HTML Table Class</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../libraries/trackback.html">Trackback Class</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../libraries/typography.html">Typography Class</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../libraries/unit_testing.html">Unit Testing Class</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../libraries/uri.html">URI Class</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../libraries/user_agent.html">User Agent Class</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../libraries/xmlrpc.html">XML-RPC and XML-RPC Server Classes</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../libraries/zip.html">Zip Encoding Class</a></li>
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</ul>
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</li>
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</ul>
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<ul>
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<li class="toctree-l1"><a class="reference internal" href="../database/index.html">Database Reference</a><ul>
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<li class="toctree-l2"><a class="reference internal" href="../database/examples.html">Quick Start: Usage Examples</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../database/configuration.html">Database Configuration</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../database/connecting.html">Connecting to a Database</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../database/queries.html">Running Queries</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../database/results.html">Generating Query Results</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../database/helpers.html">Query Helper Functions</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../database/query_builder.html">Query Builder Class</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../database/transactions.html">Transactions</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../database/metadata.html">Getting MetaData</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../database/call_function.html">Custom Function Calls</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../database/caching.html">Query Caching</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../database/forge.html">Database Manipulation with Database Forge</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../database/utilities.html">Database Utilities Class</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../database/db_driver_reference.html">Database Driver Reference</a></li>
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</ul>
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</li>
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</ul>
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<ul>
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<li class="toctree-l1"><a class="reference internal" href="../helpers/index.html">Helpers</a><ul>
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<li class="toctree-l2"><a class="reference internal" href="../helpers/array_helper.html">Array Helper</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../helpers/captcha_helper.html">CAPTCHA Helper</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../helpers/cookie_helper.html">Cookie Helper</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../helpers/date_helper.html">Date Helper</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../helpers/directory_helper.html">Directory Helper</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../helpers/download_helper.html">Download Helper</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../helpers/email_helper.html">Email Helper</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../helpers/file_helper.html">File Helper</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../helpers/form_helper.html">Form Helper</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../helpers/html_helper.html">HTML Helper</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../helpers/inflector_helper.html">Inflector Helper</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../helpers/language_helper.html">Language Helper</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../helpers/number_helper.html">Number Helper</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../helpers/path_helper.html">Path Helper</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../helpers/security_helper.html">Security Helper</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../helpers/smiley_helper.html">Smiley Helper</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../helpers/string_helper.html">String Helper</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../helpers/text_helper.html">Text Helper</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../helpers/typography_helper.html">Typography Helper</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../helpers/url_helper.html">URL Helper</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../helpers/xml_helper.html">XML Helper</a></li>
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</ul>
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</li>
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</ul>
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</div>
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</div>
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</div>
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<div id="nav2">
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<a href="#" id="openToc">
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<li class="toctree-l2"><a class="reference internal" href="../libraries/trackback.html">Trackback Class</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../libraries/typography.html">Typography Class</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../libraries/unit_testing.html">Unit Testing Class</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../libraries/uri.html">URI Class</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../libraries/user_agent.html">User Agent Class</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../libraries/xmlrpc.html">XML-RPC and XML-RPC Server Classes</a></li>
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||
<li class="toctree-l2"><a class="reference internal" href="../libraries/zip.html">Zip Encoding Class</a></li>
|
||
</ul>
|
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</li>
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</ul>
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<ul>
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<li class="toctree-l1"><a class="reference internal" href="../database/index.html">Database Reference</a><ul>
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<li class="toctree-l2"><a class="reference internal" href="../database/examples.html">Quick Start: Usage Examples</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../helpers/email_helper.html">Email Helper</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../helpers/file_helper.html">File Helper</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../helpers/html_helper.html">HTML Helper</a></li>
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<hr/>
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<div role="main" class="document">
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||
<div class="section" id="news-section">
|
||
<h1>News section<a class="headerlink" href="#news-section" title="Permalink to this headline">¶</a></h1>
|
||
<p>In the last section, we went over some basic concepts of the framework
|
||
by writing a class that includes static pages. We cleaned up the URI by
|
||
adding custom routing rules. Now it’s time to introduce dynamic content
|
||
and start using a database.</p>
|
||
<div class="section" id="setting-up-your-model">
|
||
<h2>Setting up your model<a class="headerlink" href="#setting-up-your-model" title="Permalink to this headline">¶</a></h2>
|
||
<p>Instead of writing database operations right in the controller, queries
|
||
should be placed in a model, so they can easily be reused later. Models
|
||
are the place where you retrieve, insert, and update information in your
|
||
database or other data stores. They represent your data.</p>
|
||
<p>Open up the <em>application/models/</em> directory and create a new file called
|
||
<em>News_model.php</em> and add the following code. Make sure you’ve configured
|
||
your database properly as described <a class="reference internal" href="../database/configuration.html"><span class="doc">here</span></a>.</p>
|
||
<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="o"><?</span><span class="nx">php</span>
|
||
<span class="k">class</span> <span class="nc">News_model</span> <span class="k">extends</span> <span class="nx">CI_Model</span> <span class="p">{</span>
|
||
|
||
<span class="k">public</span> <span class="k">function</span> <span class="nf">__construct</span><span class="p">()</span>
|
||
<span class="p">{</span>
|
||
<span class="nv">$this</span><span class="o">-></span><span class="na">load</span><span class="o">-></span><span class="na">database</span><span class="p">();</span>
|
||
<span class="p">}</span>
|
||
<span class="p">}</span>
|
||
</pre></div>
|
||
</div>
|
||
<p>This code looks similar to the controller code that was used earlier. It
|
||
creates a new model by extending <code class="docutils literal"><span class="pre">CI_Model</span></code> and loads the database
|
||
library. This will make the database class available through the
|
||
<code class="docutils literal"><span class="pre">$this->db</span></code> object.</p>
|
||
<p>Before querying the database, a database schema has to be created.
|
||
Connect to your database and run the SQL command below (MySQL).
|
||
Also add some seed records.</p>
|
||
<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nx">CREATE</span> <span class="nx">TABLE</span> <span class="nx">news</span> <span class="p">(</span>
|
||
<span class="nx">id</span> <span class="nx">int</span><span class="p">(</span><span class="mi">11</span><span class="p">)</span> <span class="k">NOT</span> <span class="k">NULL</span> <span class="nx">AUTO_INCREMENT</span><span class="p">,</span>
|
||
<span class="nx">title</span> <span class="nx">varchar</span><span class="p">(</span><span class="mi">128</span><span class="p">)</span> <span class="k">NOT</span> <span class="k">NULL</span><span class="p">,</span>
|
||
<span class="nx">slug</span> <span class="nx">varchar</span><span class="p">(</span><span class="mi">128</span><span class="p">)</span> <span class="k">NOT</span> <span class="k">NULL</span><span class="p">,</span>
|
||
<span class="nx">text</span> <span class="nx">text</span> <span class="k">NOT</span> <span class="k">NULL</span><span class="p">,</span>
|
||
<span class="nx">PRIMARY</span> <span class="nx">KEY</span> <span class="p">(</span><span class="nx">id</span><span class="p">),</span>
|
||
<span class="nx">KEY</span> <span class="nx">slug</span> <span class="p">(</span><span class="nx">slug</span><span class="p">)</span>
|
||
<span class="p">);</span>
|
||
</pre></div>
|
||
</div>
|
||
<p>Now that the database and a model have been set up, you’ll need a method
|
||
to get all of our posts from our database. To do this, the database
|
||
abstraction layer that is included with CodeIgniter —
|
||
<a class="reference internal" href="../database/query_builder.html"><span class="doc">Query Builder</span></a> — is used. This makes it
|
||
possible to write your ‘queries’ once and make them work on <a class="reference internal" href="../general/requirements.html"><span class="doc">all
|
||
supported database systems</span></a>. Add the
|
||
following code to your model.</p>
|
||
<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="k">public</span> <span class="k">function</span> <span class="nf">get_news</span><span class="p">(</span><span class="nv">$slug</span> <span class="o">=</span> <span class="k">FALSE</span><span class="p">)</span>
|
||
<span class="p">{</span>
|
||
<span class="k">if</span> <span class="p">(</span><span class="nv">$slug</span> <span class="o">===</span> <span class="k">FALSE</span><span class="p">)</span>
|
||
<span class="p">{</span>
|
||
<span class="nv">$query</span> <span class="o">=</span> <span class="nv">$this</span><span class="o">-></span><span class="na">db</span><span class="o">-></span><span class="na">get</span><span class="p">(</span><span class="s1">'news'</span><span class="p">);</span>
|
||
<span class="k">return</span> <span class="nv">$query</span><span class="o">-></span><span class="na">result_array</span><span class="p">();</span>
|
||
<span class="p">}</span>
|
||
|
||
<span class="nv">$query</span> <span class="o">=</span> <span class="nv">$this</span><span class="o">-></span><span class="na">db</span><span class="o">-></span><span class="na">get_where</span><span class="p">(</span><span class="s1">'news'</span><span class="p">,</span> <span class="k">array</span><span class="p">(</span><span class="s1">'slug'</span> <span class="o">=></span> <span class="nv">$slug</span><span class="p">));</span>
|
||
<span class="k">return</span> <span class="nv">$query</span><span class="o">-></span><span class="na">row_array</span><span class="p">();</span>
|
||
<span class="p">}</span>
|
||
</pre></div>
|
||
</div>
|
||
<p>With this code you can perform two different queries. You can get all
|
||
news records, or get a news item by its <a class="reference external" href="#">slug</a>. You might have
|
||
noticed that the <code class="docutils literal"><span class="pre">$slug</span></code> variable wasn’t sanitized before running the
|
||
query; <a class="reference internal" href="../database/query_builder.html"><span class="doc">Query Builder</span></a> does this for you.</p>
|
||
</div>
|
||
<div class="section" id="display-the-news">
|
||
<h2>Display the news<a class="headerlink" href="#display-the-news" title="Permalink to this headline">¶</a></h2>
|
||
<p>Now that the queries are written, the model should be tied to the views
|
||
that are going to display the news items to the user. This could be done
|
||
in our <code class="docutils literal"><span class="pre">Pages</span></code> controller created earlier, but for the sake of clarity,
|
||
a new <code class="docutils literal"><span class="pre">News</span></code> controller is defined. Create the new controller at
|
||
<em>application/controllers/News.php</em>.</p>
|
||
<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="o"><?</span><span class="nx">php</span>
|
||
<span class="k">class</span> <span class="nc">News</span> <span class="k">extends</span> <span class="nx">CI_Controller</span> <span class="p">{</span>
|
||
|
||
<span class="k">public</span> <span class="k">function</span> <span class="nf">__construct</span><span class="p">()</span>
|
||
<span class="p">{</span>
|
||
<span class="k">parent</span><span class="o">::</span><span class="na">__construct</span><span class="p">();</span>
|
||
<span class="nv">$this</span><span class="o">-></span><span class="na">load</span><span class="o">-></span><span class="na">model</span><span class="p">(</span><span class="s1">'news_model'</span><span class="p">);</span>
|
||
<span class="nv">$this</span><span class="o">-></span><span class="na">load</span><span class="o">-></span><span class="na">helper</span><span class="p">(</span><span class="s1">'url_helper'</span><span class="p">);</span>
|
||
<span class="p">}</span>
|
||
|
||
<span class="k">public</span> <span class="k">function</span> <span class="nf">index</span><span class="p">()</span>
|
||
<span class="p">{</span>
|
||
<span class="nv">$data</span><span class="p">[</span><span class="s1">'news'</span><span class="p">]</span> <span class="o">=</span> <span class="nv">$this</span><span class="o">-></span><span class="na">news_model</span><span class="o">-></span><span class="na">get_news</span><span class="p">();</span>
|
||
<span class="p">}</span>
|
||
|
||
<span class="k">public</span> <span class="k">function</span> <span class="nf">view</span><span class="p">(</span><span class="nv">$slug</span> <span class="o">=</span> <span class="k">NULL</span><span class="p">)</span>
|
||
<span class="p">{</span>
|
||
<span class="nv">$data</span><span class="p">[</span><span class="s1">'news_item'</span><span class="p">]</span> <span class="o">=</span> <span class="nv">$this</span><span class="o">-></span><span class="na">news_model</span><span class="o">-></span><span class="na">get_news</span><span class="p">(</span><span class="nv">$slug</span><span class="p">);</span>
|
||
<span class="p">}</span>
|
||
<span class="p">}</span>
|
||
</pre></div>
|
||
</div>
|
||
<p>Looking at the code, you may see some similarity with the files we
|
||
created earlier. First, the <code class="docutils literal"><span class="pre">__construct()</span></code> method: it calls the
|
||
constructor of its parent class (<code class="docutils literal"><span class="pre">CI_Controller</span></code>) and loads the model,
|
||
so it can be used in all other methods in this controller.
|
||
It also loads a collection of <a class="reference internal" href="../helpers/url_helper.html"><span class="doc">URL Helper</span></a>
|
||
functions, because we’ll use one of them in a view later.</p>
|
||
<p>Next, there are two methods to view all news items and one for a specific
|
||
news item. You can see that the <code class="docutils literal"><span class="pre">$slug</span></code> variable is passed to the model’s
|
||
method in the second method. The model is using this slug to identify the
|
||
news item to be returned.</p>
|
||
<p>Now the data is retrieved by the controller through our model, but
|
||
nothing is displayed yet. The next thing to do is passing this data to
|
||
the views.</p>
|
||
<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="k">public</span> <span class="k">function</span> <span class="nf">index</span><span class="p">()</span>
|
||
<span class="p">{</span>
|
||
<span class="nv">$data</span><span class="p">[</span><span class="s1">'news'</span><span class="p">]</span> <span class="o">=</span> <span class="nv">$this</span><span class="o">-></span><span class="na">news_model</span><span class="o">-></span><span class="na">get_news</span><span class="p">();</span>
|
||
<span class="nv">$data</span><span class="p">[</span><span class="s1">'title'</span><span class="p">]</span> <span class="o">=</span> <span class="s1">'News archive'</span><span class="p">;</span>
|
||
|
||
<span class="nv">$this</span><span class="o">-></span><span class="na">load</span><span class="o">-></span><span class="na">view</span><span class="p">(</span><span class="s1">'templates/header'</span><span class="p">,</span> <span class="nv">$data</span><span class="p">);</span>
|
||
<span class="nv">$this</span><span class="o">-></span><span class="na">load</span><span class="o">-></span><span class="na">view</span><span class="p">(</span><span class="s1">'news/index'</span><span class="p">,</span> <span class="nv">$data</span><span class="p">);</span>
|
||
<span class="nv">$this</span><span class="o">-></span><span class="na">load</span><span class="o">-></span><span class="na">view</span><span class="p">(</span><span class="s1">'templates/footer'</span><span class="p">);</span>
|
||
<span class="p">}</span>
|
||
</pre></div>
|
||
</div>
|
||
<p>The code above gets all news records from the model and assigns it to a
|
||
variable. The value for the title is also assigned to the <code class="docutils literal"><span class="pre">$data['title']</span></code>
|
||
element and all data is passed to the views. You now need to create a
|
||
view to render the news items. Create <em>application/views/news/index.php</em>
|
||
and add the next piece of code.</p>
|
||
<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="o"><</span><span class="nx">h2</span><span class="o">><?</span><span class="nx">php</span> <span class="k">echo</span> <span class="nv">$title</span><span class="p">;</span> <span class="cp">?></span><span class="p"></</span><span class="nt">h2</span><span class="p">></span>
|
||
|
||
<span class="cp"><?php</span> <span class="k">foreach</span> <span class="p">(</span><span class="nv">$news</span> <span class="k">as</span> <span class="nv">$news_item</span><span class="p">)</span><span class="o">:</span> <span class="cp">?></span>
|
||
|
||
<span class="p"><</span><span class="nt">h3</span><span class="p">></span><span class="cp"><?php</span> <span class="k">echo</span> <span class="nv">$news_item</span><span class="p">[</span><span class="s1">'title'</span><span class="p">];</span> <span class="cp">?></span><span class="p"></</span><span class="nt">h3</span><span class="p">></span>
|
||
<span class="p"><</span><span class="nt">div</span> <span class="na">class</span><span class="o">=</span><span class="s">"main"</span><span class="p">></span>
|
||
<span class="cp"><?php</span> <span class="k">echo</span> <span class="nv">$news_item</span><span class="p">[</span><span class="s1">'text'</span><span class="p">];</span> <span class="cp">?></span>
|
||
<span class="p"></</span><span class="nt">div</span><span class="p">></span>
|
||
<span class="p"><</span><span class="nt">p</span><span class="p">><</span><span class="nt">a</span> <span class="na">href</span><span class="o">=</span><span class="s">"</span><span class="cp"><?php</span> <span class="k">echo</span> <span class="nx">site_url</span><span class="p">(</span><span class="s1">'news/'</span><span class="o">.</span><span class="nv">$news_item</span><span class="p">[</span><span class="s1">'slug'</span><span class="p">]);</span> <span class="cp">?></span><span class="s">"</span><span class="p">></span>View article<span class="p"></</span><span class="nt">a</span><span class="p">></</span><span class="nt">p</span><span class="p">></span>
|
||
|
||
<span class="cp"><?php</span> <span class="k">endforeach</span><span class="p">;</span> <span class="cp">?></span>
|
||
</pre></div>
|
||
</div>
|
||
<p>Here, each news item is looped and displayed to the user. You can see we
|
||
wrote our template in PHP mixed with HTML. If you prefer to use a template
|
||
language, you can use CodeIgniter’s <a class="reference internal" href="../libraries/parser.html"><span class="doc">Template
|
||
Parser</span></a> class or a third party parser.</p>
|
||
<p>The news overview page is now done, but a page to display individual
|
||
news items is still absent. The model created earlier is made in such
|
||
way that it can easily be used for this functionality. You only need to
|
||
add some code to the controller and create a new view. Go back to the
|
||
<code class="docutils literal"><span class="pre">News</span></code> controller and update <code class="docutils literal"><span class="pre">view()</span></code> with the following:</p>
|
||
<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="k">public</span> <span class="k">function</span> <span class="nf">view</span><span class="p">(</span><span class="nv">$slug</span> <span class="o">=</span> <span class="k">NULL</span><span class="p">)</span>
|
||
<span class="p">{</span>
|
||
<span class="nv">$data</span><span class="p">[</span><span class="s1">'news_item'</span><span class="p">]</span> <span class="o">=</span> <span class="nv">$this</span><span class="o">-></span><span class="na">news_model</span><span class="o">-></span><span class="na">get_news</span><span class="p">(</span><span class="nv">$slug</span><span class="p">);</span>
|
||
|
||
<span class="k">if</span> <span class="p">(</span><span class="k">empty</span><span class="p">(</span><span class="nv">$data</span><span class="p">[</span><span class="s1">'news_item'</span><span class="p">]))</span>
|
||
<span class="p">{</span>
|
||
<span class="nx">show_404</span><span class="p">();</span>
|
||
<span class="p">}</span>
|
||
|
||
<span class="nv">$data</span><span class="p">[</span><span class="s1">'title'</span><span class="p">]</span> <span class="o">=</span> <span class="nv">$data</span><span class="p">[</span><span class="s1">'news_item'</span><span class="p">][</span><span class="s1">'title'</span><span class="p">];</span>
|
||
|
||
<span class="nv">$this</span><span class="o">-></span><span class="na">load</span><span class="o">-></span><span class="na">view</span><span class="p">(</span><span class="s1">'templates/header'</span><span class="p">,</span> <span class="nv">$data</span><span class="p">);</span>
|
||
<span class="nv">$this</span><span class="o">-></span><span class="na">load</span><span class="o">-></span><span class="na">view</span><span class="p">(</span><span class="s1">'news/view'</span><span class="p">,</span> <span class="nv">$data</span><span class="p">);</span>
|
||
<span class="nv">$this</span><span class="o">-></span><span class="na">load</span><span class="o">-></span><span class="na">view</span><span class="p">(</span><span class="s1">'templates/footer'</span><span class="p">);</span>
|
||
<span class="p">}</span>
|
||
</pre></div>
|
||
</div>
|
||
<p>Instead of calling the <code class="docutils literal"><span class="pre">get_news()</span></code> method without a parameter, the
|
||
<code class="docutils literal"><span class="pre">$slug</span></code> variable is passed, so it will return the specific news item.
|
||
The only things left to do is create the corresponding view at
|
||
<em>application/views/news/view.php</em>. Put the following code in this file.</p>
|
||
<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="o"><?</span><span class="nx">php</span>
|
||
<span class="k">echo</span> <span class="s1">'<h2>'</span><span class="o">.</span><span class="nv">$news_item</span><span class="p">[</span><span class="s1">'title'</span><span class="p">]</span><span class="o">.</span><span class="s1">'</h2>'</span><span class="p">;</span>
|
||
<span class="k">echo</span> <span class="nv">$news_item</span><span class="p">[</span><span class="s1">'text'</span><span class="p">];</span>
|
||
</pre></div>
|
||
</div>
|
||
</div>
|
||
<div class="section" id="routing">
|
||
<h2>Routing<a class="headerlink" href="#routing" title="Permalink to this headline">¶</a></h2>
|
||
<p>Because of the wildcard routing rule created earlier, you need an extra
|
||
route to view the controller that you just made. Modify your routing file
|
||
(<em>application/config/routes.php</em>) so it looks as follows.
|
||
This makes sure the requests reaches the <code class="docutils literal"><span class="pre">News</span></code> controller instead of
|
||
going directly to the <code class="docutils literal"><span class="pre">Pages</span></code> controller. The first line routes URI’s
|
||
with a slug to the <code class="docutils literal"><span class="pre">view()</span></code> method in the <code class="docutils literal"><span class="pre">News</span></code> controller.</p>
|
||
<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$route</span><span class="p">[</span><span class="s1">'news/(:any)'</span><span class="p">]</span> <span class="o">=</span> <span class="s1">'news/view/$1'</span><span class="p">;</span>
|
||
<span class="nv">$route</span><span class="p">[</span><span class="s1">'news'</span><span class="p">]</span> <span class="o">=</span> <span class="s1">'news'</span><span class="p">;</span>
|
||
<span class="nv">$route</span><span class="p">[</span><span class="s1">'(:any)'</span><span class="p">]</span> <span class="o">=</span> <span class="s1">'pages/view/$1'</span><span class="p">;</span>
|
||
<span class="nv">$route</span><span class="p">[</span><span class="s1">'default_controller'</span><span class="p">]</span> <span class="o">=</span> <span class="s1">'pages/view'</span><span class="p">;</span>
|
||
</pre></div>
|
||
</div>
|
||
<p>Point your browser to your document root, followed by index.php/news and
|
||
watch your news page.</p>
|
||
</div>
|
||
</div>
|
||
|
||
|
||
</div>
|
||
<footer>
|
||
|
||
<div class="rst-footer-buttons" role="navigation" aria-label="footer navigation">
|
||
|
||
<a href="create_news_items.html" class="btn btn-neutral float-right" title="Create news items">Next <span class="fa fa-arrow-circle-right"></span></a>
|
||
|
||
|
||
<a href="static_pages.html" class="btn btn-neutral" title="Static pages"><span class="fa fa-arrow-circle-left"></span> Previous</a>
|
||
|
||
</div>
|
||
|
||
|
||
<hr/>
|
||
|
||
<div role="contentinfo">
|
||
<p>
|
||
© Copyright 2014 - 2019, British Columbia Institute of Technology.
|
||
Last updated on Sep 19, 2019.
|
||
</p>
|
||
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|
||
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||
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|
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|
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|
||
|
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