Form value repopulate

For a form I am working on I am trying to repopulate the fields after a submit and validation detected issues.
No matter what I try, it does not seem to work. 
My controller looks like this:

Code:

public function index()
    {
        helper(['form', 'url']);
        if (!$this->validate([

            'naam' => 'required'
         
        ])) {         
            echo view('form', [
                'validation' => $this->validator,
            ]);
        } else {
            echo "success!";
        }
    }

The view looks like this:

Code:

$attributes = ['class' => 'needs-validation', 'id' => 'form'];
echo form_open('public', $attributes);

      <div class="mb-3">
        <div class="row">
          <div class="col-12 col-md-6">
            <label for="Naam" class="form-label">Je naam</label>
            <input type="text" id="naam" name="naam" class="form-control <?php if ($validation->hasError('naam')) { echo "is-invalid"; } ?>" value="<?= set_value('naam') ?>">
          </div>
        </div>
      </div> 

If I look at the examples in de docs this should be sufficient to repopulate a form but it stays blank. Any ideas?

In the manual for CI 4 there is no mention of the repopulate option anymore under the validation library but I see the options are now listed under the forms section. Even in the examples there is no mention of this option, nor is it under the upgrade page (Upgrade Validations — CodeIgniter 4.1.9 documentation). Is this ommited or does it need to be implemented in a different way? I would be noteworthy to mention this on a upgrade page.

For a form I am working on I am trying to repopulate the fields after a submit and validation detected issues.
No matter what I try, it does not seem to work. 
My controller looks like this:

Code:

public function index()
    {
        helper(['form', 'url']);
        if (!$this->validate([

            'naam' => 'required'
         
        ])) {         
            echo view('form', [
                'validation' => $this->validator,
            ]);
        } else {
            echo "success!";
        }
    }

The view looks like this:

Code:

$attributes = ['class' => 'needs-validation', 'id' => 'form'];
echo form_open('public', $attributes);

      <div class="mb-3">
        <div class="row">
          <div class="col-12 col-md-6">
            <label for="Naam" class="form-label">Je naam</label>
            <input type="text" id="naam" name="naam" class="form-control <?php if ($validation->hasError('naam')) { echo "is-invalid"; } ?>" value="<?= set_value('naam') ?>">
          </div>
        </div>
      </div> 

If I look at the examples in de docs this should be sufficient to repopulate a form but it stays blank. Any ideas?

In the manual for CI 4 there is no mention of the repopulate option anymore under the validation library but I see the options are now listed under the forms section. Even in the examples there is no mention of this option, nor is it under the upgrade page (Upgrade Validations — CodeIgniter 4.1.9 documentation). Is this ommited or does it need to be implemented in a different way? I would be noteworthy to mention this on a upgrade page.

have you tried 

PHP Code:

value="<?= old('email') ?>" give it a shot and lemme know 


to use this [ value="<?= old('email') ?>" ] , you need return like this [ withInput() ]:

return redirect()->back()->withInput()->

CodeIgniter 4 User Guide - Global Functions and Constants - old

What did you Try? What did you Get? What did you Expect?

Joined CodeIgniter Community 2009.  ( Skype: insitfx )

Why do the form helper documentation or those of validation not mention this?

So instead of using:

Code:

echo view('form', [
                'validation' => $this->validator,
            ]);

I need to do a redirect? Coming from CI3 this would have never crossed my mind, especially since the docs don't mention it anymore.

Thanks all for the help.

Your code works as expected.

PHP Code:

<?php

namespace App\Controllers;

class Home extends BaseController
{
    public function index()
    {
        helper(['form', 'url']);

        if (! $this->validate([
            'naam' => 'required|min_length[100]',
        ])) {
            echo view('form', [
                'validation' => $this->validator,
            ]);
        } else {
            echo 'success!';
        }
    }
} 


PHP Code:

<?php
$attributes = ['class' => 'needs-validation', 'id' => 'form'];
echo form_open('/', $attributes);
?>

<div class="mb-3">
    <div class="row">
        <div class="col-12 col-md-6">
            <label for="Naam" class="form-label">Je naam</label>
            <input type="text" id="naam" name="naam" class="form-control <?php
            if ($validation->hasError('naam')) {
                echo 'is-invalid';
            } ?>" value="<?= set_value('naam') ?>">
        </div>
    </div>
</div>

<?php
echo form_submit('', 'Send');
echo form_close();
?>

ci-phpunit-test | CodeIgniter Testing Guide | CodeIgniter 3 to 4 Upgrade Helper

Well, I have exactly what you posted and my form is not returning values.

About this:

Code:

return redirect()->back()->withInput()->

The documentation says:

If you are using the form helper, this feature is built-in. You only need to use this function when not using the form helper.

But set_value and old are both not working.

Im writing because I had the same problem.
Solution for me:
1. In controller

Code:

function __construct()
    {
        helper('form');
    }

2. In view

Code:

value="<?php echo set_value('[your field]'); ?>"