Gsyfuy

I want to show the button in my custom module (admin page)

but I am getting an error

I want to add a button and how I add action process for that button

i already tried this answer : (https://magento.stackexchange.com/a/212656/73525 )

GenericButton.php

    <?php

/**

 * Copyright © 2016 Magento. All rights reserved.

 * See COPYING.txt for license details.

 */

namespace WebkulMpquotesystemBlockAdminhtmlManagequotesEdit;



use MagentoBackendBlockWidgetContext;

//use FMENewsApiNewsRepositoryInterface;

use MagentoFrameworkExceptionNoSuchEntityException;



/**

 * Class GenericButton

 */

class GenericButton

{

    /**

     * @var Context

     */

    protected $context;



    /**

     * @var BlockRepositoryInterface

     */

    protected $blockRepository;



    /**

     * @param Context $context

     * @param BlockRepositoryInterface $blockRepository

     */

    public function __construct(

        Context $context

    ) {

        $this->context = $context;

        //$this->blockRepository = $blockRepository;

    }



    /**

     * Return CMS block ID

     *

     * @return int|null

     */

    public function getBlockId()

    {

/*

        {

            return $this->blockRepository->getById(

                $this->context->getRequest()->getParam('news_id')

            )->getId();

        }  */

        return null;

    }



    /**

     * Generate url by route and parameters

     *

     * @param   string $route

     * @param   array $params

     * @return  string

     */

    public function getUrl($route = '', $params = [])

    {

        return $this->context->getUrlBuilder()->getUrl($route, $params);

    }

}

SaveandContinuebutton.php

<?php



namespace  WebkulMpquotesystemBlockAdminhtmlManagequotesEdit;



use MagentoFrameworkViewElementUiComponentControlButtonProviderInterface;



/**

 * Class SaveAndContinueButton

 */

class SaveAndContinueButton extends GenericButton implements ButtonProviderInterface

{



    public function getButtonData()

    {

        return [

            'label' => __('ADmin pproval'),

            'class' => 'save',

            'on_click' => 'location.reload();',

            'sort_order' => 30

        ];

    }

}

view/adminhtml/uicomponent/custommodule_edit.xml

<?xml version="1.0"?>

<!-- /**

 * Webkul Software

 *

 * @category  Webkul

 * @package   Webkul_Mpquotesystem

 * @author    Webkul

 * @copyright Copyright (c) 2010-2018 Webkul Software Private Limited (https://webkul.com)

 * @license   https://store.webkul.com/license.html

 */ -->

<form xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:module:Magento_Ui:etc/ui_configuration.xsd">

    <argument name="data" xsi:type="array">



    <item name="buttons" xsi:type="array">

        <item name="save_and_continue" xsi:type="string">WebkulMpquotesystemBlockAdminhtmlManagequotesEditSaveAndContinueButton</item>

    </item>



    </argument>

</form>

when clicking that admin custom module page :

Fatal error: Method
MagentoUiTemplateEngineXhtmlResult::__toString() must not throw an
exception, caught Error: Call to a member function
getRequestFieldName() on null in
/var/www/html/equpo2/vendor/magento/module-ui/Component/Wrapper/UiComponent.php
on line

Just change your SaveAndContinueButton file: and chek after clearing generated folder

       namespace WebkulMpquotesystemBlockAdminhtmlManagequotesEdit;



        use MagentoCustomerApiAccountManagementInterface;

        use MagentoFrameworkViewElementUiComponentControlButtonProviderInterface;



        class SaveAndContinueButton  implements ButtonProviderInterface

        {



            public function getButtonData()

            {

                return [

                    'label' => __('Save and Continue Edit'),

                    'class' => 'save',

                    'data_attribute' => [

                        'mage-init' => ['button' => ['event' => 'saveAndContinueEdit']],

                        'form-role' => 'save',

                    ],

                    'sort_order' => 80,

                ];

            }



        }