Avoid unnecessary function calls in JSF

Question

How can I avoid calling a function on my bean more than once if I have several HTML elements that call this function in their rendered attribute?

<h:outputText value="1" rendered="#{myBean.myFunc() eq 70}"/> 
<h:outputText value="2" rendered="#{myBean.myFunc() eq 42}"/>

Here, the second outputText will unnecessarily call myFunc() again. Is it possible to avoid this behavior?

You could store the result of myFunc() in a variable and use that instead. But then you need to call myFunc() yourself somewhere. Still that is what i would do. But you could also use some sort of caching like ehcache, but that might be overkill. — Mario B, Nov 19 '14 at 10:33
possible duplicate of [Defining and reusing variable in JSF page](http://stackoverflow.com/questions/6434866/defining-and-reusing-variable-in-jsf-page) — futureelite7, Nov 19 '14 at 10:36

score 0 · Accepted Answer · edited May 23 '17 at 11:57

0

This answer by BalusC provides a nice way to set and reuse variables in JSF.

edited May 23 '17 at 11:57

Community

answered Nov 19 '14 at 10:35

dubes

what library is ``? – dasLort Nov 19 '14 at 10:51
is the JSTL core taglib. [here is a link to docs](https://docs.oracle.com/javaee/6/javaserverfaces/2.0/docs/pdldocs/facelets/c/tld-summary.html) – dubes Nov 19 '14 at 10:55

1 Answers1