java - Multiple Instances of <C:if / Choose /When> condition to be made as one -

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1: have jsp multiple html "tr's"

  <tr>'s

my page

  <% ...%>   <html>   ...   <body>   <table>   <tr class="1"> first line</tr>   <br/>   <tr class="2"> second line</tr>   <br/>   <tr class="3"> third line</tr>   <br/>   <tr class="4"> fourth line</tr>   <br/>   <tr class="5"> fifth line</tr>   <br/>   ...   </html>

2: getting user session (if logged in). note>>:using liferay themedisplay here

  <%string useremail=themedisplay.getuser().getemailaddress();%>   <c:set var="useremail" value="<%=useremail%>"></c:set>

3: made check see if guest or registered/logged in user.

then display changes first , last "tr's" logged-in user.

  <% ...%>   <html>   ...   <body>   <table>   <c:if test="${not empty useremail}">         <tr class="1"> first line registered user</tr>   <c:if test="${empty useremail}">         <tr class="1"> first line</tr>   <br/>   <tr class="2"> second line</tr>   <br/>   <tr class="3"> third line</tr>   <br/>   <tr class="4"> fourth line</tr>   <br/>   <c:if test="${not empty useremail}">         <tr class="5"> fifth line registered user</tr>   <c:if test="${empty useremail}">         <tr class="5"> fifth line</tr>   <br/>   ...   </html>

this working fine!!

my question>>>>>if want make check constant of sort, not repeated many times on jsp/html page. done ???

  <c:if> //to declared once. , called ever <tr> needs check??

a few alternatives:

  1. use c:set set registered variable on page, use c:choose.
     <c:set var="registered" value="${not empty useremail}"/>     <c:choose>     <c:when test="${registered}">     <tr class="1"> first line registered user</tr>     </c:when>     <c:otherwise>     <tr class="1"> first line</tr>     </c:otherwise>     </c:choose>
  1. write first , last lines blank table rows, use c:choose run javascript insert data want.
     <table>     <tr id="firstrow"></tr>     ...     <tr id="lastrow"></tr>     </table>      <c:choose>     <c:when test="${not empty useremail}">     <script>     document.getelementbyid('firstrow').innerhtml = 'this first line registered user';     document.getelementbyid('lastrow').innerhtml = 'this fifth line registered user';     </script>     </c:when>     <c:otherwise>     <script>     document.getelementbyid('firstrow').innerhtml = 'this first line';     document.getelementbyid('lastrow').innerhtml = 'this fifth line';     </script>     </c:otherwise>     </c:choose>


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