How to display dynamic column added by vo.addDynamicAttribute in jspx?

Question

Hi,
I met problem when programmatically add cloumn and display it on screen. Here are my steps:
0. define a ViewObject using xml. Define a transient column Addtion2. later will add a dynamic column Addtion3, but not defined here.
1. Implement Application Module, adding a method init() and expose it to client.
2. In init() method, get target VO and use vo.addDynamicAttribute("Addition3"). Then iterate it use row.setAttribute("Addition3", Math.random()). Add init() to page binding and invoke it.( it's invoked )
3. In jspx, use dynamic table. But Addition3 never shows up.
This is my last question: Re: How to display dynamic column added by vo.addDynamicAttribute in jspx? People say I should use dynamic table.
please have a look at my code:
Application Module: when it runs, it will print 6 coulmns. vo.getAttributeCount() is <font color="red">6</font>.
<pre>
public void init() {
ViewObject vo = this.getCountryView1();
if (vo.getAttributeIndexOf("Addition3") == -1) {
vo.addDynamicAttribute("Addition3");
vo.executeQuery();
for (AttributeDef deft : vo.getAttributeDefs()) {
System.out.println(deft.getColumnName() + ": " + deft.getName());
RowSetIterator it = vo.createRowSetIterator("i1");
while (it.hasNext()) {
Row r = it.next();
r.setAttribute("Addition2", Math.random());
r.setAttribute("Addition3", Math.random());
it.closeRowSetIterator();
for (AttributeDef deft : vo.getAttributeDefs()) {
System.out.println(deft.getColumnName() + ": " + deft.getName());
System.out.println(vo.getAttributeCount()); //vo.getAttributeCount() is 6
</pre>
jspx: when it runs, only 5 columns are shown. Column Addition2's values are set as expected. but Column Addition3 never shows up. And #{bindings.CountryView1.attributeCount} shows <font color="red">5</font>.
<pre>
<af:table rows="#{bindings.CountryView1.rangeSize}"
fetchSize="#{bindings.CountryView1.rangeSize}"
emptyText="#{bindings.CountryView1.viewable ? 'No data to display.' : 'Access Denied.'}"
var="row" rowBandingInterval="0"
value="#{bindings.CountryView1.collectionModel}"
selectedRowKeys="#{bindings.CountryView1.collectionModel.selectedRow}"
selectionListener="#{bindings.CountryView1.collectionModel.makeCurrent}"
rowSelection="single" id="t1">
<af:forEach items="#{bindings.CountryView1.attributeDefs}" var="def">
<af:column headerText="#{def.name}"
sortable="true" sortProperty="#{def.name}" id="c1">
<af:outputText value="#{row[def.name]}" id="ot1"/>
</af:column>
</af:forEach>
</af:table>
<af:forEach items="#{bindings.CountryView1.attributeDefs}" var="def">
<af:outputText value="#{def.name}" id="ot2"/>
</af:forEach>
<af:outputText value="#{bindings.CountryView1.attributeCount}" id="ot3"/>
</pre>
it's quite weird for me. The vo.getAttributeCount() is 6, but #{bindings.CountryView1.attributeCount} shows 5. And column Addtion3 never shows up.
what's the matter? How can I show the dynamic added column Addtion3?
Edited by: simon li on 2012-9-10 下午7:31
Edited by: simon li on 2012-9-10 下午8:00

Answer 1

Hi,
Can you check the tree binding (CountryView1 - in the pagedef) and see it has the 5 attributes hardcoded in it. If yes, try removing everything and then run the page to see if it works fine.
-Arun