README

CodeIgniter Widget

CodeIgniter 3 Widget for reusable building view blocks

This Widget extension is collected into yidas/codeigniter-pack which is a complete solution for Codeigniter framework.

Features

• Common interface with Yii2 pattern like

• Reusable building blocks implementation

• PSR-4 Namespace support for static call

OUTLINE

• Demonstration
• Requirements
• Installation
• Configuration
• Create Widgets
  • Rendering View
  • Utilizing CodeIgniter Resources
• Usage
• Reference

DEMONSTRATION

Define a widget then use it in Codeigniter's view:

<?php
use app\widgets\Hello;
?>
<div>
<?=Hello::widget(['message' => 'Good morning']);?>
</div>

REQUIREMENTS

This library requires the following:

• PHP 5.4.0+
• CodeIgniter 3.0.0+
• yidas/codeigniter-psr4-autoload 1.0.0+

INSTALLATION

Run Composer in your Codeigniter project under the folder \application:

composer require yidas/codeigniter-widget

Check Codeigniter application/config/config.php:

$config['composer_autoload'] = TRUE;

You could customize the vendor path into $config['composer_autoload']

CONFIGURATION

Widget extension require yidas/codeigniter-psr4-autoload to implement PSR-4 Namespace, which you need to configure at first:

1. Enabling Hooks

The hooks feature can be globally enabled/disabled by setting the following item in the application/config/config.php file:

$config['enable_hooks'] = TRUE;

2. Adding a Hook

Hooks are defined in the application/config/hooks.php file, add above hook into it:

$hook['pre_system'][] = [new yidas\Psr4Autoload, 'register'];

After the configuration, you are able to create widgets.

CREATE WIDGETS

To create a widget, extend from yidas\Widget and override the init() and/or run() methods, remember to defind this widget a current namespace refering by yidas/codeigniter-psr4-autoload.

init() contains the code that initializes the widget properties.

run() contains the code that generates the rendering result of the widget.

In the following example, Hello widget display the partial view with assigning to its message property. If the property is not set, it will display your Codeigniter base_url by default. This widget file should place in application/widgets/Hello.php:

<?php

namespace app\widgets;

use yidas\Widget;

class Test extends Widget
{
    // Customized variable for Widget
    public $message;
    
    public function init()
    {
        // Use $this->CI for accessing Codeigniter object
        $baseUrl = $this->CI->config->item('base_url');
        
        if ($this->message === null) {
            $this->message = "Your Site: {$baseUrl}";
        }
    }
    
    public function run()
    {
        // Render the view `test.php` in `WidgetPath/views` directory,
        return $this->render('test', [
            'message' => $this->message,
            ]);
    }
}

yidas/codeigniter-psr4-autoload provides the PSR-4 Namespace ability for Codeigniter framework.

Rendering View

public string render(string $view, array $variables=[])

By default, views for a widget should be stored in files in the WidgetPath/views directory, where WidgetPath stands for the directory containing the widget class file.

Therefore, the above example will render the view file app/widgets/views/hello.php, assuming the widget class is located under app/widgets.

You may override the yidas\Widget::getViewPath() method to customize the directory containing the widget view files.

Example:

    public function run()
    {
        return $this->render('view_name', [
            'variable' => $this->property,
            ]);
    }

Utilizing CodeIgniter Resources

Widget already prepared $CI property which is CodeIgniter Resources object, you could access it by $this->CI in your widget's init() or run() methods.

    public function run()
    {
        // Get data from a model
        $this->CI->load->model('Menu_model');
        $list = $this->CI->Menu_model->getList();
        
        // Build widget's view with list data
        return $this->render('test', [
            'list' => $list,
            ]);
    }

USAGE

Widget on View

Statically call widget() with config in view, and the widget would render into that place:

<?php
use app\widgets\Hello;
?>
<div>
<?=Hello::widget(['message' => 'Good morning']);?>
</div>

REFERENCE

• Application Structure: Widgets | The Definitive Guide to Yii 2.0 | Yii PHP Framework