JSTL: Work with conditional statements

Question

Hallo everybody!
I'd have the following question:
If I need to have a condition whithin my JSP, I can write, e.g.:
<c:if test="${pageContext.request.method=='POST'}">Here I access some class variable, it is clear.
But what if a condition concerns a result of a method call on an object? E.g., I need to check if pageConfig.isReadonly("commodity_group") is true or false?
Obvously, <c:if test="${pageConfig.isReadonly("commodity_group")}"> does not work.
I can't find a way to do it...
Andrew

Answer 1

There isn't a direct way in EL. EL can only call getters/setters.
It can not call any bean methods that take parameters
You can hack it a little if your pageConfig bean has two attributes instead of one.
public class PageConfig{
  String field;
  public String getField(){return field;}
  public void setField(String field){this.field = field;}
  public boolean isReadOnly(){ return isReadOnly(field) }
  public boolean isReadOnly(String field){
    //your implementation
}And then
<c:set target="pageConfig" property="field" value="commodity_group"/>
<c:if test="${pageConfig.readOnly}">
</c:if>An alternative in an EL container is to use a custom function.