I have a custom JSF component that renders navigation links. The following
is a typical usage of the component:
<custom:navigationBar id="navbar" spacing="2"
actionListener="#{testBean.navigationLinkClicked}" immediate="true"
binding="#{testBean.navigationBar}">
<custom:navigationLink id="primaryData" value="Primary Data"/>
<custom:navigationLink id="principals" value="Principals"
active="true"/>
<custom:navigationLink id="administrators"
value="Administrators"/>
<custom:navigationLink id="custodians" value="Custodians"/>
<custom:navigationLink id="accountingFirms" value="Accounting
Firms" clickable="false"/>
<custom:navigationLink id="lawFirms" value="Law Firms"
clickable="false"/>
<custom:navigationLink id="billing" value="Billing"
clickable="false"/>
</custom:navigationBar>
And, the rendered content will appear as following:
Primary Data | Principals | Administrators | Custodiams | Accounting Firms
| Law Firms | Billing
As you notice, the navigationBar component is bounded to
#{testBean.navigationBar} which is defined as below in the Backing bean:
public class TestBean {
private HtmlNavigationBar navigationBar;
.... // -- getter & setter for navigationBar
public String formSubmitted() {
HtmlNavigationLink link = new HtmlNavigationLink();
link.setId("link");
link.setValue("New link");
navigationBar.getChildren().add(link)
return null;
}
}
The backing bean has an action method formSubmitted() that adds a child
(HtmlNavigationLink) component to the parent (HtmlNavigationBar)
dynamically. This method is invoked on form submit. I thought that this
newly added child would be the last child (as it was added to end of the
children list). But, when the navigationBar renders its children, the
HtmlNavigationLink 'New link' appears as the first child causing the
content rendered as below:
New Link | Primary Data | Principals | Administrators | Custodiams |
Accounting Firms | Law Firms | Billing
The following is the encodeChildren() method of HtmlNavigationBar
@Override
public void encodeChildren(FacesContext context) throws
IOException {
ResponseWriter writer = context.getResponseWriter();
List<UIComponent> children = getChildren();
int count = children.size();
for (int i = 0; i < count; i++) {
UIComponent child = children.get(i); // -- why
does 'New link' appear at index == 0?
if (child instanceof HtmlNavigationLink) {
child.encodeAll(context);
}
}
}
As noted in the comment above, while the child component was added to the
end of the list in the action method, it appears at index position 0 as
the first child? Why is it so?
________________________
Keerthi Panneerselvam
Development Delivery - NetxOffice
iNautix Technologies India Private Limited, an affiliate of Pershing LLC,
a subsidiary of The Bank of New York Mellon Corporation
www.inautix.co.in
Office: 612-6696 (V)
Email: [email protected]
