Add module Enable/disable functionality in Magento 2

Question

I want to add Enable/disable functionality in my custom module by which the module can be enabled or disable directly form admin-panel for just selecting.

I want to add something like this in my custom module

Answer 1

Modify this files based on your module (update module namespace)

Vendor/YourModuleName/etc/adminhtml/events.xml

  <?xml version="1.0"?>
    <config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:Event/etc/events.xsd">
    <event name="admin_system_config_changed_section_yourmodulename">
        <observer name="vendor_yourmodulename_disable" instance="Vendor\YourModuleName\Observer\DisableOutput" />
    </event>
</config>

Vendor/YourModuleName/Observer/DisableOutput.php

<?php
namespace Vendor\YourModuleName\Observer;

use Magento\Config\Model\ResourceModel\Config;

class DisableOutput implements \Magento\Framework\Event\ObserverInterface
{

const VENDOR_CONFIG = 'yourmodulename/general/enable';

/**
 * @var \Magento\Config\Model\ResourceModel\Config
 */
protected $_config;

/**
 * @var \Magento\Framework\App\Config\ScopeConfigInterface
 */
protected $_scopeConfig;

/**
 * @var \Magento\Store\Model\StoreManagerInterface
 */
protected $storeManager;


/**
 * DisableOutput constructor.
 * @param \Magento\Config\Model\ResourceModel\Config $_config
 * @param \Magento\Framework\App\Config\ScopeConfigInterface $_scopeConfig
 * @param \Magento\Store\Model\StoreManagerInterface $storeManager
 * @param \Magento\Framework\App\RequestInterface $request
 */
public function  __construct(
    Config $_config,
    \Magento\Framework\App\Config\ScopeConfigInterface $_scopeConfig,
    \Magento\Store\Model\StoreManagerInterface $storeManager,
    \Magento\Framework\App\RequestInterface $request
){
    $this->_config = $_config;
    $this->_scopeConfig = $_scopeConfig;
    $this->storeManager = $storeManager;
    $this->request = $request;

}

/**
 * @param \Magento\Framework\Event\Observer $observer
 */
public function execute(\Magento\Framework\Event\Observer $observer)
{
    $disable = false;
    $scopeType = \Magento\Framework\App\Config\ScopeConfigInterface::SCOPE_TYPE_DEFAULT;
    $scopeCode = 0;

    if($this->request->getParam(\Magento\Store\Model\ScopeInterface::SCOPE_STORE))
    {
        $scopeType = ScopeInterface::SCOPE_STORE;
        $scopeCode = $this->storeManager->getStore($this->request->getParam(\Magento\Store\Model\ScopeInterface::SCOPE_STORE))->getCode();
    }elseif($this->request->getParam(\Magento\Store\Model\ScopeInterface::SCOPE_WEBSITE))
    {
        $scopeType = ScopeInterface::SCOPE_WEBSITE;
        $scopeCode = $this->storeManager->getWebsite($this->request->getParam(\Magento\Store\Model\ScopeInterface::SCOPE_WEBSITE))->getCode();
    }
    else
    {
        $scopeType = \Magento\Framework\App\Config\ScopeConfigInterface::SCOPE_TYPE_DEFAULT;
        $scopeCode = 0;
    }
    $moduleConfig= $this->_scopeConfig->getValue(self::VENDOR_CONFIG, $scopeType);


    if((int)$moduleConfig == 0){
        $disable = true;
    }

    $moduleName = 'Vendor_YourModuleName';
    $outputPath = "advanced/modules_disable_output/$moduleName";

    $this->_config->saveConfig($outputPath,$disable, $scopeType,$scopeCode);
}
}

etc/adminhtml/system.xml

<?xml version="1.0"?>
<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:module:Magento_Config:etc/system_file.xsd">
    <system>
        <section id="yourmodulename" translate="label" sortOrder="150" showInDefault="1" showInWebsite="1" showInStore="1">
            <resource>Vendor_YourModuleName::configuration</resource>
            <group id="general" translate="label" type="text" sortOrder="10" showInDefault="1" showInWebsite="0" showInStore="0">
                <label>Configuration</label>
                <field id="enable" translate="label" type="select" sortOrder="1" showInDefault="1" showInWebsite="0" showInStore="0">
                    <label>Enable Module</label>
                    <source_model>Magento\Config\Model\Config\Source\Enabledisable</source_model>
                </field>
            </group>
        </section>
    </system>
</config>

etc/adminhtml/menu.xml

<?xml version="1.0"?>

<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
        xsi:noNamespaceSchemaLocation="../../../Backend/etc/menu.xsd">
    <menu>
        <add id="Vendor_YourModuleName::yourmodulename_configuration"
             title="Configuration"
             resource="Magento_Backend::content"
             module="Vendor_YourModuleName"
             sortOrder="1"
             action="adminhtml/system_config/edit/section/yourmodulename"
             parent="Vendor_YourModuleName::yourmodulename" />
    </menu>
</config>

Answer 2

This type of functionality does not exist at Magento.

If you want to develop this functionality on your module then you have to add an If conditions of checking this system configuration field on every code of this module. That is too complex and too tough to implement this logic on any module code.

Also, Implementation of this system field checking on a module totally depends on the module code and its business logic and how the business logic is implemented On the code.

Be a developer, my suggestion, you cannot possibly implement this type of enable/disable of a module from admin

Answer 3

Create a system Config file in your custom module

You can do like this (Assuming your custom module name is "Sample Shipping"

Vendor\Module\etc\adminhtml\system.xml

system.xml

<?xml version="1.0"?>
<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:noNamespaceSchemaLocation="urn:magento:module:Magento_Config:etc/system_file.xsd">
<system>
    <section id="carriers" translate="label" type="text" sortOrder="320" showInDefault="1" showInWebsite="1" showInStore="1">
        <group id="sampleShipping" translate="label" type="text" sortOrder="0" showInDefault="1" showInWebsite="1" showInStore="1">
            <label>Sample Shipping</label>
            <field id="active" translate="label" type="select" sortOrder="1" showInDefault="1" showInWebsite="1" showInStore="0" canRestore="1">
                <label>Enable</label>
                <source_model>Magento\Config\Model\Config\Source\Yesno</source_model>
            </field>
        </group>
    </section>
</system>

Vendor\Module\etc\config.xml

config.xml

<?xml version="1.0"?>
<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:noNamespaceSchemaLocation="urn:magento:module:Magento_Store:etc/config.xsd">
<default>
    <carriers>
        <sampleShipping>
            <version>1.0.0</version>
            <active>1</active>
            <sallowspecific>0</sallowspecific>
        </sampleShipping>
    </carriers>
</default>

Creating those files in your custom module will enable you to disable/enable your custom module in
Stores > Sales > Shipping method configuration