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I am working on a simple custom module, where the user can input height and the weight/BMI will be shown as output on form submit. On clicking the submit button user will be redirected to different controller/action. Below is the code

<div class="row clearfix"> <div class="col-md-12 column"> <form name="height" method="POST" action="<?php echo $block->getFormAction() ?>"> <div class="well"> <strong><?php echo __('Enter Height:')?></strong> <input type="text" id="calculateTotalInput" name="calculateTotalInput" class="form-control input-md"> <input type="submit" id="calculateTotalSubmit" name="calculate-total-submit" value="Calculate Total"> </div> <?php if(isset($weight && $bmi)){ ?> <div class="col-sm-6 col-xs-12" style="margin-bottom: 30px;"> <?php echo __('Height:')?> <input type="text" value="<?= $weight ?>" name="weight" class="form-control input-md" readonly=""> <?php echo __('BMI:')?> <input type="text" value="<?= $bmi ?>" name="weight" class="form-control input-md" readonly=""> </div> <?php } ?> </form> </div> </div>

Screenshot

enter image description here

Block File

<?php namespace Magento2\HelloWorld\Block; use \Magento\Framework\View\Element\Template; use \Magento\Framework\View\Element\Template\Context; class Index extends Template { public function __construct(Context $context, array $data = []) { parent::__construct($context, $data); } /** * Retrieve form action * * @return string */ public function getFormAction() return $this->getUrl('helloworld/result/result', array('_secure' => $this->getRequest()->isSecure())); } }

Controller File

<?php namespace Magento2\HelloWorld\Controller\Result; use \Magento\Framework\App\Action\Action; use \Magento\Framework\Controller\ResultFactory; class Result extends Action { public function execute() { $post = $this->getRequest()->getPostValue(); if ($post) { //retrieve height $calculateTotalInput = $post['calculateTotalInput']; //calculate weight/bmi $weight = ($calculateTotalInput * 2)/2.5 //some calculations $bmi = ($calculateTotalInput * 2)/3.5 //some calculations } // Render the page $this->_view->loadLayout(); $this->_view->renderLayout(); } }
  • How do I pass & display $weight and $bmi value in phtml file ?
  • Best practice to pass values from controller to phtml ? Using block or without block and if yes, then HOW?
  • How do I pass an array containing multiple values from a controller to phtml via JSON?
  • What is the difference between Jsonfactory and Pagefactory and when to use?
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  • If it's just some calculations, why not do it in JavaScript? Commented Oct 8, 2017 at 13:01
  • How to do the same in Magento custom module ? Or via ajax ? Commented Oct 8, 2017 at 13:03

1 Answer 1

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You can use Magento\Framework\App\Request\DataPersistorInterface

Using this class, you can show proceed data to form url.

One of example is Magento_Contact module contacts form.

At post Action,you can set form data

$post = $this->getRequest()->getPostValue();

$postObject = new \Magento\Framework\DataObject();

$postObject->setData($post);

$this->getDataPersistor()->set('{formname}', $post);

And form page, you can get those data by

$this->postData = (array) $this->getDataPersistor()->get({formname});

For particular field by

$this->postData[{fieldName}]

Example:

Post Action:

<?php namespace {Vendorname}\{Modulename}\Controller\{Controllername}; use Magento\Framework\App\Request\DataPersistorInterface; class {PostActioName} { public $dataPersistor; public function __construct( ..... DataPersistorInterface $dataPersistor, .... ) { $this->dataPersistor = $dataPersistor; } public function execute() { $post = $this->getRequest()->getPostValue(); try { $postObject = new \Magento\Framework\DataObject(); $postObject->setData($post); /* clear form data */ $this->getDataPersistor()->clear('{form_Name}'); } catch (\Exception $e) { .... /* set form data */ $this->getDataPersistor()->set('{form_Name}', $post); .... } } }

Post value to form Url:

You can this data at block class by Magento\Framework\App\Request\DataPersistorInterface

namespace{Vendorname}\{Modulename}\Block; use Magento\Framework\App\Request\DataPersistorInterface; class Form extends \Magento\Framework\View\Element\Template { private $postData = null; public $dataPersistor; public function __construct( .... \Magento\Framework\View\Element\Template\Context $context, DataPersistorInterface $dataPersistor, .... ) { .... $this->dataPersistor = $dataPersistor; parent::__construct($context); .... } public function getPostValue($key) { if (null === $this->postData) { $this->postData = (array) $this->getDataPersistor()->get('{form_Name}'); $this->getDataPersistor()->clear('{form_Name}'); } if (isset($this->postData[$key])) { return (string) $this->postData[$key]; } return ''; } }
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