How to set default text field value in form Magento 2

Question

I want to set field value of form field in Magento 2.

Actual Result

Expected Result

I have added required code here which are available in my Form.php

<?php
namespace Magenest\Membership\Block\Adminhtml\Gift\Edit;

class Form extends FormGeneric
{
    protected $_status;
    protected $_systemStore;
    protected $_wysiwygConfig;
    protected $productGift;

    public function __construct(
        Context $context,
        Registry $registry,
        FormFactory $formFactory,
        GroupRepositoryInterface $groupRepository,
        SearchCriteriaBuilder $searchCriteriaBuilder,
        DataObject $objectConverter,
        SystemStore $systemStore,
        Config $wysiwygConfig,
        ProductGift $productGift,
        array $data = []
    ) {
        $this->_systemStore           = $systemStore;
        $this->_groupRepository       = $groupRepository;
        $this->_searchCriteriaBuilder = $searchCriteriaBuilder;
        $this->_objectConverter       = $objectConverter;
        $this->_wysiwygConfig = $wysiwygConfig;
        $this->productGift = $productGift;
        parent::__construct($context, $registry, $formFactory, $data);
    }

    protected function _prepareForm()
    {
        $model = $this->_coreRegistry->registry('membership_gift_edit');
        $data  = $model->getData();
        $form = $this->_formFactory->create();
        $form->setHtmlIdPrefix('page_');

        $fieldset = $form->addFieldset('base_fieldset', ['legend' => __('Gift')." ".$model->getId()]);

        if ($model->getId()) {
            $fieldset->addField(
                'id',
                'hidden',
                ['name' => 'id']
            );
        }


            $fieldset->addField(
                'customer_id',
                'text',
                [
                    'label'    => __('Customer Id'),
                    'title'    => __('Customer Id'),
                    'name'     => 'customer_id',
                    'required' => true,
                ]
            );


        $form->setUseContainer(true);
        $form->setAction($this->getUrl('membership/gift/save'));
        $form->setMethod('post');
        $form->setUseContainer(true);
        $form->setId('edit_form');
        $form->setValues($model->getData());
        $this->setForm($form);
        return parent::_prepareForm();
    }

}

I have tried as below but didn't get result.

Try 1:

            $fieldset->addField(
                'customer_id',
                'text',
                [
                    'label'    => __('Customer Id'),
                    'title'    => __('Customer Id'),
                    'name'     => 'customer_id',
                    'required' => true,
                ]
            );
$fieldset->setValue('myvalue');

Try 2:

            $fieldset->addField(
                'customer_id',
                'text',
                [
                    'label'    => __('Customer Id'),
                    'title'    => __('Customer Id'),
                    'name'     => 'customer_id',
                    'value' => 'test',

                ]
            );

I also refer below link but still facing an issue. How to set field value of form field in Magento 2

Answer 1

Try this

$fieldset->addField(
    'customer_id',
    'text',
    [
        'label'    => __('Customer Id'),
        'title'    => __('Customer Id'),
        'name'     => 'customer_id',
        'required' => true,
    ]
);

$model->setData('customer_id', '10');

Second way:

You can achieve this using following way also.

$fieldset->addField(
    'customer_id',
    'text',
    [
        'label'    => __('Customer Id'),
        'title'    => __('Customer Id'),
        'name'     => 'customer_id',
        'required' => true,
        'value' => '10',
    ]
);

...
...

    if ($model->getId()) {
        $form->setValues($model->getData());
    }
    $this->setForm($form);

Answer 2

setValues() function is overriding the 'value' that you have set for the field. This line of code which would reset the form values:

$form->setValues($model->getData());

Solution:

Set model data before setValues() function as below:

if (!$model->getId()) {
    $model->setData('customer_id', '19');
}
$form->setValues($model->getData());

Answer 3

Use below code on same file it will sure work.

$model->setData('customer_id', "20");
 $form->setValues($model->getData());

I did use below code and its work fine for me

$model->setData('title', "yourValue");
  $form->setValues($model->getData());

Answer 4

You can try the below solution as well.

<?php
namespace Magenest\Membership\Block\Adminhtml\Gift\Edit;

class Form extends FormGeneric
{
    protected $_status;
    protected $_systemStore;
    protected $_wysiwygConfig;
    protected $productGift;

    public function __construct(
        Context $context,
        Registry $registry,
        FormFactory $formFactory,
        GroupRepositoryInterface $groupRepository,
        SearchCriteriaBuilder $searchCriteriaBuilder,
        DataObject $objectConverter,
        SystemStore $systemStore,
        Config $wysiwygConfig,
        ProductGift $productGift,
        array $data = []
    ) {
        $this->_systemStore           = $systemStore;
        $this->_groupRepository       = $groupRepository;
        $this->_searchCriteriaBuilder = $searchCriteriaBuilder;
        $this->_objectConverter       = $objectConverter;
        $this->_wysiwygConfig = $wysiwygConfig;
        $this->productGift = $productGift;
        parent::__construct($context, $registry, $formFactory, $data);
    }

    protected function _prepareForm()
    {
        $model = $this->_coreRegistry->registry('membership_gift_edit');
        $data  = $model->getData();
        $form = $this->_formFactory->create();
        $form->setHtmlIdPrefix('page_');

        $fieldset = $form->addFieldset('base_fieldset', ['legend' => __('Gift')." ".$model->getId()]);

        if ($model->getId()) {
            $fieldset->addField(
                'id',
                'hidden',
                ['name' => 'id']
            );
        }


            $fieldset->addField(
                'customer_id',
                'text',
                [
                    'label'    => __('Customer Id'),
                    'title'    => __('Customer Id'),
                    'name'     => 'customer_id',
                    'required' => true,
                    'value' => '19'
                ]
            );


        $form->setUseContainer(true);
        $form->setAction($this->getUrl('membership/gift/save'));
        $form->setMethod('post');
        $form->setUseContainer(true);
        $form->setId('edit_form');
        $_data = $model->getData();
        if ($model->getId()) {
            $form->setValues($_data);
        }
        $this->setForm($form);
        return parent::_prepareForm();
    }

}