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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