Create beautiful image upload in configuration magento 2

Question

add image in create new product

How to make an similar image upload in configuration instead of

In add product, it uses phtml file. In configuration, it uses xml file.

Answer 1

In system.xml you should add this code below:

<field id="upload_image_id" translate="label comment" type="image" sortOrder="50" showInDefault="1" showInWebsite="1" showInStore="1">
    <label>Select Image</label>
    <backend_model>NameSpace\YourModule\Model\Config\Backend\Image</backend_model>
    <base_url type="media" scope_info="1">yourfolder</base_url>
</field>

And you should create custom model using in system.xml:

NameSpace\YourModule\Model\Config\Backend\Image.php

<?php

namespace NameSpace\YourModule\Model\Config\Backend;

class Image extends \Magento\Config\Model\Config\Backend\Image
{
    /**
     * The tail part of directory path for uploading
     *
     */
    const UPLOAD_DIR = 'yourfolder'; // Folder save image

    /**
     * Return path to directory for upload file
     *
     * @return string
     * @throw \Magento\Framework\Exception\LocalizedException
     */
    protected function _getUploadDir()
    {
        return $this->_mediaDirectory->getAbsolutePath($this->_appendScopeInfo(self::UPLOAD_DIR));
    }

    /**
     * Makes a decision about whether to add info about the scope.
     *
     * @return boolean
     */
    protected function _addWhetherScopeInfo()
    {
        return true;
    }

    /**
     * Getter for allowed extensions of uploaded files.
     *
     * @return string[]
     */
    protected function _getAllowedExtensions()
    {
        return ['jpg', 'jpeg', 'gif', 'png', 'svg'];
    }
}

Answer 2

Although the accepted answer worked for me. For some reason the validation does not work. I ended up using a custom Config\Backend\Image file.

In my system.xml I've added the image field below

<field id="my_image_field" translate="label" sortOrder="1" type="Magento\Config\Block\System\Config\Form\Field\Image" showInDefault="1" showInWebsite="1" showInStore="1">
    <label>My Image</label>
    <backend_model>Vendor\Package\Model\Config\Backend\Image</backend_model>
    <base_url type="media" scope_info="1">my_image_folder</base_url>
    <validate>required-entry</validate>
    <upload_dir config="system" scope_info="1">my_image_folder</upload_dir>
</field>

Then, as you can tell, I've created the file "Vendor\Package\Model\Config\Backend\Image" with the following content:

<?php

namespace Vendor\Package\Model\Config\Backend;

class Image extends \Magento\Config\Model\Config\Backend\File
{
    protected function _getAllowedExtensions()
    {
        return ['jpg', 'jpeg', 'gif', 'png', 'svg'];
    }
}

FIY, the image will be saved in magento_root/pub/media/my_image_folder.

I hope it helps.