Hi all,
I am trying to figure out some elegant way to use Tapestry to build
dynamic ajax-based tree-like UI widget. In general it's about showing
some hierarchical data:
* Some data item
* some sub property
* some sub property
* last level of props
* some sub property
Each level of that tree is (at least I planned in this way) a separate
component as on each of those levels different things are shown with
different actions. So here comes the question: how to approach this
problem in a way that could be implemented by someone, who knows basics
of Tapestry?
I thought about creating separate page (let's call it
AjaxComponentProvider) which would be called when user clicks an item.
This page would have injected components for those levels and would
render next level of components (by deleting rendering to
sub-components) as an XML. This XML would be then inserted into the
page. Thanks to such approach it would be easy to switch from AJAX-based
display to 'classical' one.
One thing that I can't find is how to obtain a String with URL to a
AjaxComponentProvider with some additional properties... My initial ACP
looks like this:
public abstract class AjaxComponentProvider extends DatapatrolBasePage {
public static final String pageName = "AjaxComponentProvider";
public enum Action {GET_OCCURRENCE_DETAILS}
public abstract Action getAction();
public abstract void setAction(Action a);
@InjectComponent("OccurrenceInfo")
public abstract OccurrenceInfo getOccurrenceInfoComponent();
public DpOccurrence getShownOccurrence() {
Collection<DpItem> items = MockDataProvider.createSearchedItems();
return (DpOccurrence)
items.iterator().next().getDpOccurrences().toArray()[0];
}
/**
* @see
org.apache.tapestry.BaseComponent#renderComponent(org.apache.tapestry.IMarkupWriter,
org.apache.tapestry.IRequestCycle)
*/
@Override
protected void renderComponent(IMarkupWriter arg0, IRequestCycle arg1) {
OccurrenceInfo oic = getOccurrenceInfoComponent();
oic.render(arg0,arg1);
//super.renderComponent(arg0, arg1);
}
}
And on a page that is supposed to use ACP to obtain some sub-level I
wanted to put something like
@InjectPage(AjaxComponentProvider.pageName)
public abstract AjaxComponentProvider getAjaxComponentProvider();
public String getLink() {
AjaxComponentProvider acp = getAjaxComponentProvider();
acp.setAction(Action.GET_OCCURRENCE_DETAILS);
String toRet = // here I need to get string with url to
AjaxComponentProvider page with props set
return toRet;
}
this getLink() method would be used in composing javascript on the
template to create ajax requests...
What are you thoughts about it? Am I missing some much easier and
elegant way to do this?
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