How can use <s:if> tag in Struts 2?

Question

I have the below Struts 2 tag, I need to check if property value="#attr.row.Commentaire is not empty and if it's not, display a small icon where the user can click it and consult the contents of the property value="#attr.row.Commentaire.

How can I use the <s:if> tag of Struts 2 efficiently to do that?

<display:column title="Commentaire" sortable="true" sortProperty="Commentaire"
    class="alerte_td_commentaire">              
<s:property value="#attr.row.Commentaire"/>

Answer 1

Use the following code

<s:if test="#attr.row.Commentaire != null && #attr.row.Commentaire != ''">

The if tag uses the test attribute to evaluate OGNL expression to a boolean value.

You may also want to use an a tag which renders a HTML anchor tag that could be used combined with the if tag to

consult the contents of the property

There's also a debug tag that could be used to wrap other tags to show you a link that will render a debug data.

<s:debug>  
 <s:property value="%{#attr.row.Commentaire}"/>
</s:debug>