grails - 显示flash消息 [英] grails - display flash message

问题描述

我有一个显示对象列表。如果在删除对象时存在 DataIntegrityViolation ，我想显示一条消息。我在做的是：

  def delete（）{
 
 def instanceToDelete = Myobject.get （params.id）
 try {
 instanceToDelete.delete（flush：true）
 redirect（action：list，id：params.id）
} 
 catch（DataIntegrityViolationException e）{
 flash.message =some message
 //我想刷新包含flash.message的div 
} 
} 
  

以下是应该显示的Flash消息：

 < g：if test =$ {flash.message}> 
< div class =alert alert-errorstyle =display：block> $ {flash.message}< / div> 
  

对不起 - 我知道这是一个愚蠢的问题，但我真的找不到解决方案。

flash object是存储键/值对的 Map ，因此您可以为错误消息定义自己的键。例如：

  try {
 instanceToDelete.delete（flush：true）
 flash.message =成功删除对象

 catch（DataIntegrityViolationException e）{
 flash.error =无法删除对象
} 
重定向（操作：list，然后，你可以检查 flash   

c $ c>包含错误键的对象，并为该类消息使用不同的样式：



 < g：if test =$ {flash.error}> 
< div class =alert alert-errorstyle =display：block> $ {flash.error}< / div> 
< / g：if> 
 < div class =messagestyle =display：block> $ {flash.message}< / div> 
< / g：if> 
  




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’s a DataIntegrityViolation when an object is deleted. What I’m doing is:

def delete() {

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

Here is where the flash message should be displayed:

  <g:if test="${flash.message}">
  <div class="alert alert-error" style="display: block">${flash.message}</div>

Sorry — I know it’s a silly question, but I really can't find a solution.

解决方案

The flash object is a Map which stores key/value pairs, so you can define your own key for error messages. For example:

try {
    instanceToDelete.delete(flush: true)            
    flash.message = "successfully deleted object"
 }
 catch (DataIntegrityViolationException e) {
    flash.error = "could not delete object"            
 }
redirect(action: "list", id: params.id)

Then you can check the flash object containing the error key, and use a different style for that kind of message:

<g:if test="${flash.error}">
  <div class="alert alert-error" style="display: block">${flash.error}</div>
</g:if>
<g:if test="${flash.message}">
  <div class="message" style="display: block">${flash.message}</div>
</g:if>

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