простейший компонент для InstantCMS 2.x

form_division.php

<?php
// system/controllers/division/forms/form_division.php
class formDivisionDivision extends cmsForm {

    public function init() {
        
        return [
           [
               "type" => "fieldset",
               "childs" => [
                   new fieldNumber("source", [
                       "title" => "Исходное число",
                       "rules" => [
                            ["required"]
                        ]
                   ]),
                   new fieldNumber("divider", [
                       "title" => "Делитель",
                       "rules" => [
                            ["required"]
                        ]
                   ])
               ]
           ] 
        ];
    }

}

frontend.php

<?php
// system/controllers/division/frontend.php
class division extends cmsFrontend {
    public function actionIndex() {
        $form = $this->getForm("division");
        $errors = false;
        $numbers = [];
        $template = cmsTemplate::getInstance(); 
        $template->render("index", [
            "form" => $form,
            "errors" => $errors,
            "numbers" => $numbers
        ]);
        
    }
    public function actionCalc() {
        if ($this->request->isAjax() === false) {
            exit;
        }
        $post = (object)$_POST;
        if (is_numeric($post->source) && is_numeric($post->divider) && $post->divider != 0) {
            $reply["result"] = (float)$post->source / (float)$post->divider;
            $reply["msg"] = "Расчет выполнен.";
        } else {
            $reply["result"] = "-";
            $reply["msg"] = "Данные некорректны. Расчет не  выполнен.";
        }
        $s = json_encode($reply);
        header("Content-type: application/json");
        echo $s;
        exit;
    }

index.tpl.php

<?php
// templates/default/controllers/division/index.tpl.php
$d = "Деление";
$this->setPageTitle($d);
$this->addBreadcrumb($d);
?>
<h1><?php echo $d; ?></h1>
<?php
$formID = md5(microtime(true));
$numbers = ["source" => 0, "divider" => 1];
$this->renderForm($form, $numbers, [
        "form_id" => $formID,        
        "submit" => ["title" => "Рассчитать", "id" => "calc"]
    ], $errors);
?>

<div id="result"></div>
<div id="msg"></div>

<script>
    
$('<?php echo "#".$formID; ?>').submit(function(e) {

    $.ajax({
        url: 'calc',
        data: $(this).serialize(),
        type: 'post',
        success: function(response){
            $('#result').html(response.result);
            $('#msg').html(response.msg);
        }
     });
     
     e.preventDefault(); 
});
</script>