I've been pulling my hair out on this one for a couple of days now :)
I have an action form that needs to be able to handle a dynamic number
of multiselect or checkbox fields.
Typically if I knew I only had to grab one pre-known set of values, I'd
do something like
// my action form..
private String[] possibleValues;
private String[] values;
// getters and setters..
// my jsp:
<html:select multiple="3" property="values">
<html:options property="possibleValues[${idx}]"/>
</html:select>
And this works fine.
Now, the problem: how to have a variable number of these multiselect
fields? My thought is that I would use a List of String[], and indexed
properties on my action form, and then some EL magic in my JSP:
// my action form
private List<String[]> possibleValues;
private List<String[]> values;
public List<String> getValues(){...}
public void setValues(List<String>> {...}
// my jsp:
<c:forEach var="idx" begin="0" end="${someothernumber}">
<html-el:select multiple="3" property="values${idx}">
<html-el:options property="possibleValues[${idx}]"/>
</html-el>
</c:forEach>
And using this approach, when the form first loads up, the JSP renders
everything as desired. Each multiselect populates with the correct list
of possible values.
The problem is that when I submit the form, Struts will only populate
the first item in each multiselect. So for multiselect X, if the
possible options are "one", "two", and "three", and I have "one" and
"three" selected and then hit submit, struts will only save the String
"one" in my List<String>.
Looking a little bit deeper, I turned on DEBUG logging for
rg.apache.commons.beanutils, and found that BeanUtils was treating very
differently the two scenarios:
1. For my regular String[] property, I get output like this with
multiple values selected:
18:20:21,859 DEBUG [BeanUtils] setProperty([EMAIL PROTECTED]
, singleValues, [there,woot])
18:20:21,859 DEBUG [ConvertUtils] Convert String[2] to class
'java.lang.String[]'
18:20:21,859 DEBUG [ConvertUtils] Using converter
[EMAIL PROTECTED]
Which is perfect. It receives a String[] and sets the String[] property.
2. For my indexed List of String[], I get output like this, submitting
multiple values for that control:
18:20:21,875 DEBUG [BeanUtils] setProperty([EMAIL PROTECTED]
, values[0], [two,three])
18:20:21,875 DEBUG [ConvertUtils] Convert string 'two' to class
'[Ljava.lang.String;'
18:20:21,875 DEBUG [ConvertUtils] Using converter
[EMAIL PROTECTED]
In this case, I had selected "two" and "three" in my multiselect, but
then it simply chooses the first one and converts "two" into {"two"} and
sets the property.
The markup for one of the multiselects looks like this:
<select name="values[0]" multiple="multiple">
<option value="one">one</option>
<option value="two" selected="selected">two</option>
<option value="three">three</option>
<option value="four">four</option>
</select>
Is there a way to do what I am trying to do? I have tried all sorts of
variations on this theme. I've used String[][] to hold my values,
indexed getters and setters, to no avail. I feel like this has to be
something easy that I"m missing.
thanks for any help.
Collin
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