How to pass dynamic parameter to backing bean using EL 2.2 method expression?

Question

I'm trying to call a function from a JSF 2.0 page in my backing bean passing a dynamic parameter. It works fine as long as im passing a static string, but when I try using a dynamic one, I always get an EL parsing error. I guess its a syntax problem, but I can't think of another way to do this using method expression. I know that I could do it with the <f:param..../> tag, but I'm not going to give up on this one :)

<h:dataTable  var="urlresult" value="#{search.searchResults_sites_urls}">
    <h:column>
        <h:form>
            <h:outputText value="#{urlresult}" />
            <h:commandLink action="#{search.showUrls(#{urlresult})}" value=" x" />
        </h:form>
    </h:column>
</h:dataTable>

The method in the backing bean:

public void showUrls(String url) {
    //CODE
}

How is this caused and how can I solve it?

score 7 · Accepted Answer · edited May 23 '17 at 10:28

7

It's illegal to nest EL expressions #{}. Just remove the nested expression.

<h:commandLink action="#{search.showUrls(urlresult)}" value=" x" />

Also, as you're using this in a <h:dataTable>, in order to get it to work properly, make sure that the #{search} bean is in the view scope, or if it really needs to be request scoped, make sure that you're preserving the #{search.searchResults_sites_urls} during bean's initialization.

How to pass dynamic parameter to backing bean using EL 2.2 method expression?

1 Answers1

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