codeconsole opened a new pull request, #15560:
URL: https://github.com/apache/grails-core/pull/15560
### Flash Messages Tag (`g:flashMessages`)
Introduces a new `<g:flashMessages />` tag that renders `flash.message`,
`flash.error`, and `flash.warning` as Bootstrap
5 dismissible alerts with appropriate styling (success, danger, and
warning respectively).
The tag automatically prevents duplicate rendering -- if called in both a
page and its layout, only the first invocation produces
output. All flash content is HTML-encoded to prevent XSS.
The default layout (`main.gsp`) and all scaffolding templates now use this
tag. If your application has custom views that render
flash messages manually, you can replace the boilerplate:
```xml
<%-- Before --%>
<g:if test="${flash.message}">
<div class="alert alert-primary" role="alert">${flash.message}</div>
</g:if>
<%-- After --%>
<g:flashMessages />
The tag supports optional attributes for customizing CSS classes, icons,
ARIA role, and dismissibility. See the flashMessages tag
reference for full details.
```
This tag has been introduced to all default layouts so that every page has
automatic access to displaying flash.* messages. Multiple `<g:flashMessages
/>` are supported, but the first one rendered is prioritized. Because of
this, if a view (e.g.: scaffold view) has a `<g:flashMessages />`, that
flash.message location is prioritized over the layout location.
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