Magento2 : How to show success message in checkout page on page load

Question

Magento2:How to show success message in checkout page on page load.

Answer 1

you need to override controller action(checkout onepage), and need to add message using message manager like

$this->messageManager->addSuccess(__('My Success Message'));

Or else you can do that by javascript on load, by adding script on header block, or use jQuery or KO.