logic标签的equal,logic:present用法

た入场券 2021-09-11 08:02 342阅读 0赞

logic:equal,logic:present用法

<logic:equal value="a" name="documentContent">显示</logic:equal>

<logic:equal name="DeliverProveForm" property="userAction" value="create">  
如果DeliverProveForm里的属性userAction的值等于create就执行这儿。  
</logic:equal>

2.  
<logic:present name="tipmsg">  
如果在你的action中设置了tipmsg就执行到这儿。如：request.setAttribute("tipmsg","提示信息")  
或session.setAttribute("tipmsg","提示信息")  
<bean:write name="tipmsg"/>  
</logic:present>

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标签<logic:present>的使用

request.getSession().setAttribute("pageBean", pageBean);

request.setAttribute("result", pageBean.getObjList());

在jsp中：  
<logic:present name="result">  
        <logic:iterate id="book" name="result">  
             <logic:present name="book">  
                 <tr>  
                     <td><bean:write name="book" property="name" /></td>  
                     <td><bean:write name="book" property="author" /></td>  
                     <td><bean:write name="book" property="price" /></td>  
                  </tr>  
              </logic:present>  
         </logic:iterate>  
</logic:present>

<logic:present name="result" scope="session">这里有个scope属性可能是request,session等,  
name指的是一个对象,可能是javaBean,也可能是集合的对象,整个意思就是就是在scope(session,request)  
范围里面查找name(一个对象)是否存在,相当于一个if()语句.  
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来自: [http://hi.baidu.com/freshman0502/blog/item/205fef31bc898dad5fdf0e0e.html][http_hi.baidu.com_freshman0502_blog_item_205fef31bc898dad5fdf0e0e.html]

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