Concatenate strings in JSF/JSP EL and Javascript
el, java, jsf, jsp, richfaces
Solution
Assuming you are using Facelets, here's a relatively good solution:
- create `functions.taglib.xml` in your WEB-INF
add a context param indicating the location:
<context-param>
<param-name>facelets.LIBRARIES</param-name>
<param-value>
/WEB-INF/functions.taglib.xml
</param-value>
</context-param>
In the xml put the following:
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE facelet-taglib PUBLIC
"-//Sun Microsystems, Inc.//DTD Facelet Taglib 1.0//EN"
"https://facelets.dev.java.net/source/browse/*checkout*/facelets/src/etc/facelet-taglib_1_0.dtd">
<facelet-taglib xmlns="http://java.sun.com/JSF/Facelet">
<namespace>http://yournamespace.com/fnc</namespace>
<function>
<function-name>concat</function-name>
<function-class>com.yourpackage.utils.Functions</function-class>
<function-signature>
java.lang.String concat(java.lang.String, java.lang.String)
</function-signature>
</function>
</facelet-taglib>
in the page use the following:
xmlns:fnc="http://yournamespace.com/fnc"
....
oncomplete="#{rich:component(fnc:concat(prefix, '_examinationPanel'))}.show();"
finally, in the `Function` class define the simple method:
public static String concat(String string1, String string2) {
return string1.concat(string2);
}
Problem
I'm having troubles with EL and javascript functions (JSF 1.2, Facelets, Richfaces 3.3.0GA). I have a page that includes another composition: ``` <ui:include src="/pages/panels/examinationPanel.xhtml"> <ui:param name="prefix" value="new" /> ``` And in my `ui:composition` I want to append the `prefix` to every id. For example: ``` <rich:modalPanel id="#{prefix}_examinationPanel"> ``` That works ok. But the problem comes when I want to access the components in functions suchs as `oncomplete` I cannot get it to concatenate the strings properly. For example ``` oncomplete="#{rich:component('#{prefix}_examinationPanel')}.show();" ``` I've tried with `fn:join` as well but it does not execute the function because it complains about errors when it finds "#" character. For example: ``` oncomplete="#{rich:component(fn:join(#{prefix},'examinationPanel'))}.show()" ``` throws ``` SEVERE: Servlet.service() for servlet Faces Servlet threw exception org.apache.el.parser.ParseException: Encountered "fn:join( #" at line 1, column 33. Encountered "fn:join( #" ``` Different errors if I brace it with brackets or with # and brackets. What am I doing wrong? And another question, in a conditional command like ``` oncomplete="#{a}?#{b}:#{c}" ``` How can I "group" to be able to execute more actions when true or false? Por example something like this: ``` oncomplete="#{a}?(#{b}#{f}):(#{c}#{d}#{e})" ``` I've tried with parenthesis but does not parse it properly. Thanks in advance.