Concat two String in JSF EL expression

Question

I have the following el expression:

<af:outputText value="#{viewArticle.publish ? ('Publish on ' + viewArticle.publishDate + ' by ' + viewArticle.publishFirstName + ' ' + viewArticle.publishLastName) : 'Draft version'}"/>

But I am getting

java.lang.NumberFormatException: For input string: "Publish on "

How can I join the string?

You have to write your own EL string concat function, because EL understands + as an arithmetic operation. — Tudor Zgureanu, Jun 14 '13 at 06:48
@refrigerator that means in el this kind of function not available? — Tapas Bose, Jun 14 '13 at 06:51
Actually you can, if the EL version is 2.0+ using concat method, which version of ADF Faces are you using? — Tudor Zgureanu, Jun 14 '13 at 06:55
http://technology.amis.nl/2012/01/17/using-custom-functions-in-el-expressions-in-jsf-1-x/ this will help you :) — Tudor Zgureanu, Jun 14 '13 at 07:22
You have to write a custom EL function. [This example](http://technology.amis.nl/2012/01/17/using-custom-functions-in-el-expressions-in-jsf-1-x/) will help you :) — Tudor Zgureanu, Jun 14 '13 at 13:02

score 88 · Accepted Answer · edited Aug 01 '17 at 10:22

88

You can use the String.concat function:

<af:outputText value="#{viewArticle.publish ? 'Publish on '.concat(viewArticle.publishDate).concat(' by ').concat(viewArticle.publishFirstName).concat(' ').concat(viewArticle.publishLastName) : 'Draft version'}"/>

edited Aug 01 '17 at 10:22

albfan

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answered Nov 04 '13 at 22:38

Marcio Aguiar

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score 44 · Answer 2 · answered Jun 14 '13 at 06:50

44

You should write

value  = "#{someBean.aProperty}  something you want in between #{someBean.anotherProperty}"

answered Jun 14 '13 at 06:50

Prasad Kharkar

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That works for the attribute but does not help if you need the concatenated string as a function parameter in a JSF EL – cljk Oct 08 '20 at 11:38

Concat two String in JSF EL expression

2 Answers2