Returns a message previously set by a page action.
Flash messages are designed for passing messages from action to pages (partials and layouts),
for example for displaying form validation errors.
If you use standard POST method (not AJAX) for your forms, you need to place flash_message()
function above the form to display error messages generated by a page action. If flash message
is not empty, it is wrapped into a paragraph element with the class attribute value
"flash" + message type,
for example
<p class="flash error">. Possible values for the message types are
error
and
success. If the flash message is empty, the function returns an empty string.
If the
flash_partial variable is presented in the POST array, the function renders a partial
instead of returning the message string. Please read the
LemonStand front-end JavaScript framework article
to learn about the flash_partial feature.
The following code outputs the form tag and a flash message.
<?= open_form() ?>
<?= flash_message() ?>
...
