JSTL - How to Use request scope variable to get value from map

[ngreddyit]

Hi,
i am having a map object in JSTL, Map<String,Object> key string is like as follows 'Region_SiteName_Feature_templae'
in the above SiteName and Feature are request scope variables, how can i use them to retrieve value from map

<c:set var="mapRegions" value="${rc.regionMap}"/>
<c:set var="siteName" value="${rc.siteName}"/> ex: siteName=ABCDE
<c:set var="Feature " value="${rc.Feature }"/> ex: Feature = POY
i am getting value using the key Region_ABCDE_POY_templae
${mapRegions.Region_ABCDE_POY_templae}, but i want to generate the key dynamically using the above two siteName and Feature variables?

something like this ${mapRegions.Region_${siteName}_${Feature}_templae }

but this is not working, how can we do this using JSTL.

Thanks in Advance.

Gangi.

[Tolls]

Concatenate your String beforehand into another var?

[ngreddyit]

Thanks,
i can concatenate the string before hand, but expression inside expression is not accepting, ${ObjectrName.${concatenatedString}.data}

[Tolls]

<c:set var="concatenatedString" value="Region_${siteName}_${Feature}_templae"/>
.. then
${mapRegions[${concatenatedString}]}  // I think, I can never remember the syntax exactly.

[ngreddyit]

Above syntax is not correct, i tried this before, but its not working any thoughts?


Caused by: javax.el.ELException: Error Parsing: ${regionsAsMap[${keyString}
at org.apache.el.lang.ExpressionBuilder.createNodeInt ernal(ExpressionBuilder.java:125)
at org.apache.el.lang.ExpressionBuilder.build(Express ionBuilder.java:146)
at org.apache.el.lang.ExpressionBuilder.createValueEx pression(ExpressionBuilder.java:190)
at org.apache.el.ExpressionFactoryImpl.createValueExp ression(ExpressionFactoryImpl.java:68)
at org.apache.jasper.runtime.PageContextImpl.propriet aryEvaluate(PageContextImpl.java:922)
at org.apache.jsp.jsp.techtarget.v3.pageLayouts.wdefP ageLayout1_jsp._jspService(wdefPageLayout1_jsp.jav a:188)
at org.apache.jasper.runtime.HttpJspBase.service(Http JspBase.java:70)
at javax.servlet.http.HttpServlet.service(HttpServlet .java:803)
at org.apache.jasper.servlet.JspServletWrapper.servic e(JspServletWrapper.java:374)
... 112 more
Caused by: org.apache.el.parser.ParseException: Encountered "{" at line 1, column 17.
Was expecting one of:

[Tolls]

Take the ${} out inside the [].
I did say I can't guarantee the syntax.