How to add category drop down in system configuration Magento 2?

For any custom module we can add category drop down selection in system configuration.

Let’s start with creating a module names Magemonkeys_Categorydropdown

in adminhtml we can create file system.xml

Here is code for call category selection

<group id="categoryselection_setting" translate="label" type="text" default="1" sortOrder="1" showInDefault="1" showInWebsite="1" showInStore="1">
    <label>Setting</label>
    <field id="categorylist" translate="label" type="multiselect" sortOrder="1" showInDefault="1" showInWebsite="1" showInStore="1">
        <label>Please Select Category</label>
        <source_model>Magemonkeys\Categorydropdown\Model\Config\Source\Categorylist</source_model>
    </field>
</group>

<label>Setting</label>

<label>Please Select Category</label>

<source_model>Magemonkeys\Categorydropdown\Model\Config\Source\Categorylist</source_model>

</field>

</group>

and then we can create file Categorylist.php in Magemonkeys\Categorydropdown\Model\Config\Source

<?php
namespace Magemonkeys\Categorydropdown\Model\Config\Source;

use Magento\Framework\Option\ArrayInterface;

class Categorylist implements ArrayInterface
{
    protected $_categoryHelper;

    public function __construct(\Magento\Catalog\Helper\Category $catalogCategory)
    {
        $this->_categoryHelper = $catalogCategory;
    }

    public function getStoreCategories($sorted = false, $asCollection = false, $toLoad = true)
    {
        return $this->_categoryHelper->getStoreCategories($sorted , $asCollection, $toLoad);
    }

    public function toOptionArray()
    {

        $arr = $this->toArray();
        $ret = [];

        foreach ($arr as $key => $value)
        {

            $ret[] = [
                'value' => $key,
                'label' => $value
            ];
        }

        return $ret;
    }

    public function toArray()
    {

        $categories = $this->getStoreCategories(true,false,true);

        $catagoryList = array();
        foreach ($categories as $category){

            $catagoryList[$category->getEntityId()] = __($category->getName());
        }

        return $catagoryList;
    }

}

<?php

namespace Magemonkeys\Categorydropdown\Model\Config\Source;

use Magento\Framework\Option\ArrayInterface;

class Categorylist implements ArrayInterface

{

protected $_categoryHelper;

public function __construct(\Magento\Catalog\Helper\Category $catalogCategory)

{

$this->_categoryHelper = $catalogCategory;

}

public function getStoreCategories($sorted = false, $asCollection = false, $toLoad = true)

{

return $this->_categoryHelper->getStoreCategories($sorted , $asCollection, $toLoad);

}

public function toOptionArray()

{

$arr = $this->toArray();

$ret = [];

foreach ($arr as $key => $value)

{

$ret[] = [

'value' => $key,

'label' => $value

];

}

return $ret;

}

public function toArray()

{

$categories = $this->getStoreCategories(true,false,true);

$catagoryList = array();

foreach ($categories as $category){

$catagoryList[$category->getEntityId()] = __($category->getName());

}

return $catagoryList;

}

That’s it.

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