Setting a Struts2 select tag to a variable from the request object

Question

I want to set the Struts2 select tag to a variable from the request object instead of the action class variable.

My action class is:

     public class showSchdulesAction extends ActionSupport     
         public String execute() throws Exception {
               ...
            HttpServletRequest request = ServletActionContext.getRequest();
           request.setAttribute("repTypList",someObj.getCommonList());
              ...
          }
      }

My JSP page:

...
<s:select  onchange="genRpt(this)" list="%{repTypList}" listKey="id" listValue="val" >

</s:select>
...

I want to set the repTypeList from the request object to select tag. When I used list="%{repTypList}" or list="repTypList" then

I got error:

tag 'select', field 'list': The requested list key '%{repTypList}' could not be resolved as a collection/array/map/enumeration/iterator type. Example: people or people.{name}

When I use list="#{repTypList}" it's working but no value is shown in the combo options, even values in list.

Answer 1

There's no reason to get an object from the request in Struts2. If you are using Struts2 tag you can get the object from the valueStack via OGNL. However in Struts2 is possible to get the value from the request attributes using OGNL. For this purpose you should access the OGNL context variable request. For example

<s:select  list="%{#request.repTypList}" listKey="id" listValue="val" />

The select tag requires not null value returned via OGNL expression in the list tag, as a result of null value you got the error. So, better to check this in the action before the result is returned.

 public class showSchdulesAction extends ActionSupport     
     public String execute() throws Exception {
           ...
        HttpServletRequest request = ServletActionContext.getRequest();
        List list = someObj.getCommonList();
        if (list == null) list = new ArrayList(); 
        request.setAttribute("repTypList", list);
          ...
      }
  }

This code will save you from the error above.

Answer 2

Did you try like this..

list="%{#repTypList}"

OR

list="%{#request.repTypList}"

in struts 2 select tag