[s2] Multiple s:checkbox backed by array/list

[Laurie Harper]

I have a view with a table each row or which shows a single table 
record. Each row has a checkbox so you can select multiple items and 
click 'delete selected' to remove them in one go. This is implemented 
with an s:checkbox backed by a property in the action. What I want is 
for the property to contain a list of selected values or, if none were 
selected, for the property to be null / an empty list. I can't get that 
to work :-(

Firstly, the checkbox values are record IDs, so naturally I started out 
trying to make the property an array of Integer. That works fine when 
there are boxes checked, but if not, I get a conversion error on *every* 
checkbox saying it has an invalid value.

So then I made the property an array of String. That works too when 
there are boxes checked, but now I have to handle conversion to int by 
hand. However, if no boxes are checked, the action property gets set to 
an array of length one: the String value "false"! That explains why the 
Integer array didn't work.

Here's an outline of the relevant code:

Action:

    private Integer[] selected;
    public Integer[] getSelected() {...}
    public void setSelected(Integer[] value) {...}

JSP:

    <table>
      <s:iterate value="%{users}>
        <tr>
          <td>
            <s:checkox name="selected" fieldValue="%{id}"/>
          </td>
        </tr>
      </s:iterate>
    </table>

Again, the intent is that the 'selected' property should be null or an 
empty list if no checkboxes are selected. I need Struts *not* to try and 
store a 'false' in there in that case.

Any ideas?

L.


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