grails - display flash message

Question

I’m new to Grails, and I have a question that should be easy for most of you.

I have a page displaying an object list. I want to display a message if there’

Answer 1

Strict answer : Just return your message (or render with a model map)

for your controller :

def delete() {

    def instanceToDelete= Myobject.get(params.id)
    try {
        instanceToDelete.delete(flush: true)
        redirect(action: "list", id: params.id)
    }
    catch (DataIntegrityViolationException e) {
        render view:'delete', model:[message: "some message"]
        //I want to refresh the div containing the flash.message here
    }
}

for your gsp :

    
${message}

But Gregg is right, you should never modify client data without a redirect. If you do, the user might refresh (or come back to) the same url, and attempt again same action accidentally. You should really do like in hitt5's answer.