问题
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?
回答1:
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.
See also:
- How can I pass selected row to commandLink inside dataTable?
来源：https://stackoverflow.com/questions/8714410/how-to-pass-dynamic-parameter-to-backing-bean-using-el-2-2-method-expression