CodeIgniter Layout Library

• Author : Vincent MOULIN
• License : MIT License Copyright (c) 2017-2019 Vincent MOULIN
• Version : 4.1.0
• CodeIgniter Forum Thread : https://forum.codeigniter.com/thread-68021.html

Installation

1. Copy the file ./application/libraries/Layout.php
2. Copy the file ./application/config/config_layout.php
3. Open the file ./application/config/autoload.php:
   • add 'layout' to the array $autoload['libraries']
   • add 'url' to the array $autoload['helper'] if not already added
   • add 'config_layout' to the array $autoload['config']

4. Create the structure ("Welcome" and "hello" is for example):

   ├── application
   │   ├── templates
   │   └── views
   │       └── controllers
   │           └── Welcome
   │               └── actions
   │                   └── hello.php
   │
   └── web
       ├── css
       │   ├── controllers
       │   │   └── Welcome
       │   │       ├── actions
       │   │       │   └── hello.css
       │   │       │
       │   │       └── controller.css
       │   │
       │   └── app.css
       │
       └── js
           ├── controllers
           │   └── Welcome
           │       ├── actions
           │       │   └── hello.js
           │       │
           │       └── controller.js
           │
           └── app.js

   Note: Create the css and javascript files only if needed !

Description

The getters

• get_template()
• get_title()
• get_charset()
• get_metadata()
• get_http_equiv()
• get_breadcrumb()
• get_sections()
• get_section()
• get_css()
• get_js()

The setters

• set_template() : Set the template of the page
• set_title() : Set the title of the page
• set_charset() : Set the charset of the page
• set_metadata() : Set a "name" metadata of the page
• unset_metadata() : Unset a "name" metadata or all the "name" metadata
• set_http_equiv() : Set a "http-equiv" metadata of the page
• unset_http_equiv() : Unset a "http-equiv" metadata or all the "http-equiv" metadata
• add_breadcrumb_item() : Add an item to the breadcrumb
• remove_breadcrumb_item() : Remove an item from the breadcrumb

The "breadcrumb" section

• return_breadcrumb() : Return the breadcrumb

The "asset" section

• add_css_uri() : Add a css uri asset to the layout
  Example: $CI->layout->add_css_uri('css/app.css');
• add_css_str() : Add a css string asset to the layout
  Example: $CI->layout->add_css_str('/* some css code */');
• add_css_php() : Add a css php asset to the layout
  Example: $CI->layout->add_css_php('my_function');
my_function() is a php function which returns some css code.
• add_js_uri() : Add a javascript uri asset to the layout
  Example: $CI->layout->add_js_uri('js/app.js');
• add_js_str() : Add a javascript string asset to the layout
  Example: $CI->layout->add_js_str("var base_url = '" . $CI->config->item('base_url') . "';");
• add_js_php() : Add a javascript php asset to the layout
  Example: $CI->layout->add_js_php(['My_class', 'my_method']);
My_class::my_method() is a php function which returns some javascript code.
• add_basic_css() : Add the basic css assets according to the given tags or all the basic css assets
• add_basic_js() : Add the basic javascript assets according to the given tags or all the basic javascript assets
• add_basic_assets() : Add the basic css and javascript assets according to the given tags or all the basic css and javascript assets
• add_basic_css_except() : Add the basic css assets except those that have a tag in common with the given tags
• add_basic_js_except() : Add the basic javascript assets except those that have a tag in common with the given tags
• add_basic_assets_except() : Add the basic css and javascript assets except those that have a tag in common with the given tags

Note: The basic assets are defined in the variables $config['layout_basic_css'] and $config['layout_basic_js'] of the configuration file config_layout.php.

Note: If a basic asset is a string, it is considered as a local uri asset with no attributes and no tags.

Note: Tags are useful if you want to put some javascript at one place (for example in the head section) and some other javascript at another place (for example in the bottom of the page).
All tags must be declared in the variables $config['layout_css_tags'] and $config['layout_js_tags'] of the configuration file config_layout.php.

Example:

$config['layout_basic_css'] = array(
    'css/app.css',
    array(
        'type'        => 'uri',
        'uri'         => 'https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css',
        'location'    => 'remote',
        'attributes'  => array(
            'integrity'    => 'sha384-BVYiiSIFeK1dGmJRAkycuHAHRg32OmUcww7on3RYdg4Va+PmSTsz/K68vbdEjh4u',
            'crossorigin'  => 'anonymous',
        ),
    ),
);
$config['layout_basic_js'] = array(
    'js/app.js',
    array(
        'type'        => 'uri',
        'uri'         => 'https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js',
        'location'    => 'remote',
        'attributes'  => array(
            'integrity'    => 'sha384-Tc5IQib027qvyjSMfHjOMaLkfuWVxZxUPnCJA7l2mCWNIpG9mGCD8wGNIcPD7Txa',
            'crossorigin'  => 'anonymous',
            'async'        => true,
            'defer'        => false,
        ),
    ),
    array(
        'type'     => 'str',
        'content'  => '/* some javascript code */',
        'tags'     => ['page_head'],
    ),
    array(
        'type'      => 'php',
        'callback'  => 'my_function',
        'tags'      => ['page_bottom'],
    ),
    array(
        'type'      => 'php',
        'callback'  => ['My_class', 'my_method'],
    ),
);
$config['layout_css_tags']  = [];
$config['layout_js_tags']   = ['page_head', 'page_bottom'];

The triggers

The triggers have to be used in the templates.

• trigger_title() : Trigger the insertion of the title of the page
• trigger_charset() : Trigger the insertion of the charset of the page
• trigger_metadata() : Trigger the insertion of all the "name" metadata
• trigger_http_equiv() : Trigger the insertion of all the "http-equiv" metadata
• trigger_breadcrumb() : Trigger the insertion of the breadcrumb
• trigger_section() : Trigger the insertion of a section
• trigger_css() : Trigger the insertion of the css assets according to the given tags or all the css assets
• trigger_js() : Trigger the insertion of the javascript assets according to the given tags or all the javascript assets
• trigger_css_except() : Trigger the insertion of the css assets except those that have a tag in common with the given tags
• trigger_js_except() : Trigger the insertion of the javascript assets except those that have a tag in common with the given tags

The "template" section

• include_template() : Include a template
• block() : Define a block which should be implemented in a sub-template (but may also be implemented in the same template or inherited from an ancestor template)

Note:

• A template is a folder in the ./application/templates folder.
• Each template folder contains a PHP or YAML configuration file (config.php or config.yml).
• This configuration file contains only one data: parent_template whose value is null or the name of the parent template.
• For more details, see the examples in the ./application/templates folder.

The "view" section

• render_action_view() : Render an action view with the defined template
  The rendered view corresponds to the controller action where this method is called.
  The application, controller and action css/javascript files are automatically added (provided that the structure of the Layout web folder is compliant with the requirements).
  Note: This is the method that you will probably use most of the time.
• render_virtual_action_view() : Render a virtual action view with the defined template
  The application, controller and virtual action css/javascript files are automatically added (provided that the structure of the Layout web folder is compliant with the requirements).
  See the example: ./application/controllers/Welcome.php
• render_view() : Render a view with the defined template
• load_view() : Load a view output in a section
  Example:
  • in the controller: $this->layout->load_view('widget_view', $data_for_widget_view, 'widget_section');
  • in the template, you put <?php $CI->layout->trigger_section('widget_section'); ?> where you want to insert the loaded view "widget_view".
• return_view() : Return a view output