Robert,
The Option component expects that the selected parameter is bound to
an expression that it can read *and* write to. In other words it
expects the expression to evaluate to a bean property.
You expression works on a render (read) as it evals to a boolean and
that's ok, a value would be what a getter method would return.
However, on a rewind (write), Option is trying to set the property
that the expression evaluates to - and that doesn't work with the
expresson you have.
Hence the exception.
Geoff
public class InappropriateExpressionException
extends OgnlException
Exception thrown if an OGNL expression is evaluated in the wrong
context; the usual case is when an expression that does not end in a
property reference is passed to setValue.
http://www.opensymphony.com/ognl/api/ognl/InappropriateExpressionException.html
On 5/10/06, Robert Hannebauer <[EMAIL PROTECTED]> wrote:
Hi,
i tried to implement two dependent select boxes.
This is my very simple test case.
Home.html:
<html jwcid="@Shell" title="Test">
<body jwcid="@Body">
<span jwcid="@Form">
<select jwcid="@Select" multiple="ognl:false">
<span jwcid="@Foreach" source="ognl:dayValues"
value="ognl:day" index="ognl:dayIndex">
<option jwcid="@Option"
selected="ognl:date.get(@[EMAIL PROTECTED]) == day"
label="ognl:day" />
</span>
</select>
<select jwcid="@Select" multiple="ognl:false"
onchange="javascript:this.form.events.refresh();" >
<span jwcid="@Foreach" source="ognl:monthValues"
value="ognl:month" index="ognl:monthIndex">
<option jwcid="@Option"
selected="ognl:date.get(@[EMAIL PROTECTED]) eq monthIndex"
label="ognl:month"/>
</span>
</select>
</span>
</body>
</html>
Home.java:
package test.page;
import java.text.DateFormatSymbols;
import java.util.Calendar;
import java.util.Date;
import java.util.Iterator;
import org.apache.commons.collections.iterators.ArrayIterator;
import org.apache.tapestry.IRequestCycle;
import org.apache.tapestry.engine.IPageLoader;
import org.apache.tapestry.html.BasePage;
import org.apache.tapestry.spec.IComponentSpecification;
public abstract class Test extends BasePage {
public final static int DAYS[] = new int[31];
static {
for (int i = 1; i <= 31; ++i) {
DAYS[i-1] = i;
}
}
public abstract String getMonth();
public abstract void setMonth(String s);
public abstract int getMonthIndex();
public abstract void setMonthIndex(int l);
public abstract int getDay();
public abstract void setDay(int i);
public abstract int getDayIndex();
public abstract void setDayIndex(int l);
public abstract Calendar getDate();
public abstract void setDate(Calendar date);
public Iterator getMonthValues() {
String months[] = new
DateFormatSymbols(getPage().getLocale()).getMonths();
if (months[months.length - 1].length() > 1) {
return new ArrayIterator(months);
}
return new ArrayIterator(months, 0, months.length-1);
}
public Iterator getDayValues() {
return new ArrayIterator(DAYS, 0,
getDate().getActualMaximum(Calendar.DAY_OF_MONTH));
}
@Override
public void finishLoad(IRequestCycle arg0, IPageLoader arg1,
IComponentSpecification arg2) {
super.finishLoad(arg0, arg1, arg2);
Calendar c = Calendar.getInstance(getPage().getLocale());
c.setTime(new Date());
setDate(c);
}
}
The first time the page renders without errors. The correct values are
preselected.
But when i select a new month i get an exception:
org.apache.hivemind.ApplicationRuntimeException
Unable to update OGNL expression '<parsed OGNL expression>' of [EMAIL
PROTECTED] to false: Inappropriate OGNL expression:
date.get(@[EMAIL PROTECTED]) == day
ognl.InappropriateExpressionException
Inappropriate OGNL expression: date.get(@[EMAIL PROTECTED]) == day
What's going wrong? I'm running out of ideas.
Robert
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