How to send parameter to controller

Question

I found this code below at AddressesPost.php for addresses.phtml. How can addresses.phtml send parameter continue or new_address so AddressesPost.php can getParam('continue') or getParam('new_address')?

AddressesPost.php :

if ($this->getRequest()->getParam('continue', false)) {
   $this->_getCheckout()->setCollectRatesFlag(true);
   $this->_getState()->setActiveStep(State::STEP_SHIPPING);
   $this->_getState()->setCompleteStep(State::STEP_SELECT_ADDRESSES);
   $this->_redirect('*/*/shipping');
} elseif ($this->getRequest()->getParam('new_address')) {
   $this->_redirect('*/checkout_address/newShipping');
} else {
   $this->_redirect('*/*/addresses');
}

I already add <input type="hidden" name="split" value="0" id="split_flag"/> and <input type="hidden" name="update" value="0" id="update_flag"/> in addresses.phtml and the getParam in controller like in code below.

Controller :

elseif ($this->getRequest()->getParam('new_address')) {
    $this->_redirect('*/checkout_address/newShipping');
} elseif ($this->getRequest()->getParam('split')) {
    $btn = $this->getRequest()->getPost('btn');
       if($post = $this->getRequest()->getPost('split')){
            $this->_getCheckout()->setSplitItemInformation($post, $btn);
       } else{
            $this->_redirect('*/*/addresses');
       }
} elseif ($this->getRequest()->getParam('update')) {
    $this->messageManager->addError('test');
    $this->_redirect('*/*/addresses');
} else {
    $this->_redirect('*/*/addresses');
}

It's work for getParam('split'), but it's not work for getParam('update').

Answer 1

You can simply add one more field in the form itself. If you look into the template file below, you can see there is a hidden field called continue.

{magento-root}/vendor/magento/module-multishipping/view/frontend/templates/checkout/addresses.phtml

Similar to this hidden field, you can also include your own custom field let say your_custom_field in this form.

<form id="checkout_multishipping_form" data-mage-init='{"multiShipping":{}, "validation":{}}' action="<?= /* @escapeNotVerified */ $block->getPostActionUrl() ?>" method="post" class="multicheckout address form">
    <div class="title">
        <strong><?= /* @escapeNotVerified */ __('Please select a shipping address for applicable items.') ?></strong>
    </div>
    <input type="hidden" name="continue" value="0" id="can_continue_flag"/>

    .
    .
    .

    <input type="hidden" name="your_custom_field" value="0" id="your_custom_field"/>
</form>