如何在JavaScript警告框中打印Struts2 ActionMessage

问题描述

我有一个使用 addActionMessage（）; 发送动作消息的 Action 类。

我想使用JavaScript警告框在我的JSP中显示该消息。

我试过了

  alert（'< s ：ActionMessage的/>'）; 
  

但它显示未终止的字符串字面值。

 < ul class =actionMessage> 
< li> 
< span> 
您的留言1 
< / span> 
< / li> 
< li> 
< span> 
您的留言2，等等... 
< / span> 
< / li> 
< / ul> 
  

这会让你的javascript函数无效的JS代码破坏：

  alert（'< ul class =actionMessage> 
< li> 
 ... 
'）; 
  

解决方案是手动迭代您的消息，并自己构建输出，使用< s：property /> ，而不是使用< s：actionmessage /> ：

 < s：if test =actionMessages！= null&& actionEvents.size> 0> 
< script> 
 var actionMessages; 
< s：iterator value =actionMessages> 
 //迭代消息，并构建JS String 
 actionMessages + =' - '+'< s：property />'+'\\\
'; 
< / s：iterator> 
 alert（actionMessages）; 
< / script> 
< / s：if> 
  

还要记住从actionMessages中包装单引号。

I have one Action class which is sending an action message using addActionMessage();.

I want to display that message in my JSP using a JavaScript alert box.

I've tried with

alert  ('<s:actionmessage/>');

but it is showing unterminated string literal.

解决方案

The <s:actionmessage/> tag generates an HTML like the following:

<ul class="actionMessage">
    <li>
        <span>
            Your Message 1
        </span>
    </li>
    <li>
        <span>
            Your Message 2, and so on...
        </span>
    </li>
</ul>

This will break your javascript function with invalid JS code:

alert('<ul class="actionMessage">
        <li>
      ... 
     ');

The solution is to manually iterate over your messages, and build the output by yourself, with <s:property/>, instead of using <s:actionmessage/>:

<s:if test="actionMessages!=null && actionMessages.size > 0">
    <script>
        var actionMessages;
        <s:iterator value="actionMessages" >
            // Iterate the messages, and build the JS String
            actionMessages += '-' + '<s:property />' + '\n';
        </s:iterator>        
        alert (actionMessages);
    </script>
</s:if>

Also remember to wrap the single quotes from your actionMessages.

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