General developer forum

I've created a custom Moodle block, with a basic form. I want to show a custom profile user field called 'custom_name'.

I'm using the basic form code from moodle Documentation (https://docs.moodle.org/dev/Form_API) :

//moodleform is defined in formslib.php
require_once("$CFG->libdir/formslib.php");

class simplehtml_form extends moodleform {
    //Add elements to form
    public function definition() {
        global $CFG;
       
        $mform = $this->_form; // Don't forget the underscore! 

        $mform->addElement('text', 'email', get_string('email')); // Add elements to your form.
        $mform->setType('email', PARAM_NOTAGS);                   // Set type of element.
        $mform->setDefault('email', 'Please enter email');        // Default value.
         
    }
    //Custom validation should be added here
    function validation($data, $files) {
        return array();
    }
}

I simply need to show one custom input field ('profile_field_custom_name') and a submit button to save/update that data. If anyone could show me a similar finished example would be great. Thank you fory your help.