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Struts 2 tag not working in Display tag – Solution

Struts 2 tag not working in Display tag – Solution

 
Consider a scenario, such that you want to display a value of a column based on certain condition.
 
For example:
 
if a student’s marks is greater than 50 display as ‘pass’, if its less than 50 then display as ‘fail’. For this scenario, in a display tag, most of us result in the following code snippet.
 


<display:table name="ranklist" id="row" pagesize="10"  requestURI="rankAction" >

<s:if test="%{mark > 50}">
<display:column title="Status">Pass</display:column>
</s:if>
<s:elseif test="%{mark < 50}">
<display:column title="Status">Fail</display:column>
</s:elseif>

</display:table>

 
But here unfortunately this code does not works, because the variable “mark”is not reachable inside the display tag, since it is not associated with current display table.
 
** UPDATE: Struts 2 Complete tutorial now available here.
 
Solution :
 
So the correct way of coding is:
 

<display:table name="ranklist" id="row" pagesize="10"  requestURI="rankAction" >

<display:column property="userName" title="User Name" />

<s:if test="%{#attr.row.mark > 50}">
<display:column title="Status">Pass</display:column>
</s:if>

<s:elseif test="%{#attr.row.mark < 50}">
<display:column title="Status">Fail</display:column>
</s:elseif>

</display:table>

 
Generalized way to access the struts 2 tag via display tag is :- #attr.tableIdName.tableField. So the only way to access a struts 2 tag inside displaytag, is to follow the above syntax.
 
Example : To access a property tag inside display tag :

<s:property name="userId" value="#attr.row.userId" />

 
Related Questions:

How to get checkbox values from displaytag using struts2
Displaytag export option is not working?
 

About Mohaideen Jamil


Am currently working as a Struts 2 Developer in a reputed IT Organisations. I can help you with teaching Core java and Struts 2. Follow me on Facebook or Google Plus. If you like my tutorials, consider making a donation to this charity, thanks.

  • http://faraneshan.com mehdi

    this is not working for me, can you please give a zip or war file to show how this works?