Hi Rob,
Ah, the
cycle.scheduleRequestHandlerAfterCurrent(new TextRequestHandler(...))
looks like the part I was missing (see my response to Martin's answer)
... CSV is even better as a response format since it's more
space-efficient than JSON and understood by D3 directly.
Thanks !
Not sure if this is what you want, but we extensively use JS charting
(HighCahrts) in Wicket. I load the csv into the charts using d3.csv JS; and
just pass the callbackurl to the component rendering the charts.
Snippet:
this.csv = new AbstractAjaxBehavior() {
private static final long serialVersionUID = 63996137479L;
@Override
public void onRequest() {
final RequestCycle cycle = RequestCycle.get();
final StringValue total =
cycle.getRequest().getRequestParameters().getParameterValue("total");
final boolean needsTotal = total.toBoolean(false);
String csv;
try {
csv = uiChart.getCsv(needsTotal);
} catch (final Exception e) {
LOG.error("Problem getting CSV for pivot.", e);
// If we don't send something back, then the javascript goes crazy.
csv = "";
}
cycle.scheduleRequestHandlerAfterCurrent(new
TextRequestHandler("text/csv", "UTF-8", csv));
}
};
On Mon, Mar 16, 2020 at 9:56 AM Tobias Gierke <[email protected]>
wrote:
Hi,
We have a large (>350 pages) Wicket application that is currently using
server-side charts (JFreeChart) but are looking for a smooth way to
migrate to client-side D3.js charts. Ideally we would like to be able to
do something like this:
ChartImage img = ...
img.add( new JSONBehaviour() {
public String getChartDataJSON() {
return ....;
}
} ;
The behaviour would write a callback URL as an attribute to the markup.
The callback URL would be an endpoint that returns a plain AJAX response
(the dataset to render for this chart). The tricky part is dynamically
registering a callback URL that is scoped to the life-cycle of the
component and returns a plain AJAX response. Since something similar
must already be happening for Wickert AJAX behaviours, is there a way I
can piggy-back on the same Wicket-internal mechanism to dynamically
register my own AJAX endpoint ?
Thanks in advance,
Tobias
--
Tobias Gierke
Development
VOIPFUTURE GmbH Wendenstraße 4 20097 Hamburg, Germany
Phone +49 40 688 900 164 Fax +49 40 688 900 199
Email [email protected] Web http://www.voipfuture.com
CEO Jan Bastian
Commercial Court AG Hamburg HRB 109896, VAT ID DE263738086
