With that code the javascript should be added to the markup (which is
easy to check if you view the source form your browser). Your problem is
that the generated javascript is incorrect: you have no closing [']
after the url. That would have shown up if you opened the page in
Firebug with Scripts enabled.
On Wed, Oct 31, 2012, at 0:08, baguahsingi wrote:
> Hi,
>
> I would like to call Wicket repeatedly to obtain data from a service for
> a
> JQplot chart. I need to do this as the data is obtained from a slow web
> service. The user will then see a graph that will gradually build up
> after
> each new set of data from the server is added to it.
>
> I've had some success with this part. The user clicks a button to start
> building the graph, however, I cannot work out how to call for more data
> from javaScript to Wicket, then back again from Wicket to javaScript to
> add
> the new data to the JQplot graph.
>
> Code below (there will be a flag to signal to the javaScript that there's
> no
> more graph data, but it's not there yet):
>
> public class GraphPanel extends ParentPanel {
>
> @SpringBean
> private GraphDataService graphDataService;
>
> private Integer dataId;
>
> public GraphPanel ( String id, Integer dataId) {
>
> super(id);
> this.dataId = dataId;
> buildPage();
> }
>
>
> public void buildPage() {
>
>
> //Link used for button to start to obtain chart data
> add( new AjaxLink( "getGraphData" ){
> public void onClick( AjaxRequestTarget target ){
>
> getChartData(target);
>
> }
> } );
>
> //behaviour used to obtain url for call back from
> javaScript
> final AbstractDefaultAjaxBehavior
> jsCallbackBehaviourForMoreChartData =
> new AbstractDefaultAjaxBehavior() {
>
> @Override
> protected void respond(AjaxRequestTarget target) {
>
> getChartData(target);
> }
> };
>
> getBasePage().add(jsCallbackBehaviourForMoreChartData);
>
> final CharSequence url =
> jsCallbackBehaviourForMoreChartData.getCallbackUrl();
>
> //behaviour to provide javaScript function which I can
> call
> from my javaScript
> //function if it needs to get more data. This function is
> not added to mark up...
> add(new Behavior() {
> private static final long serialVersionUID = 1L;
>
> @Override
> public void renderHead(Component component,
> IHeaderResponse response) {
> super.renderHead(component, response);
>
> String js = "function callWicket() { var wcall
> = wicketAjaxGet ('"
> + url + ", function() { },
> function() { } ) }";
> response.renderJavaScript(js, "myScript");
>
> }
> });
> }
>
> private void getChartData(AjaxRequestTarget target) {
>
>
> GraphData graphData = null;
> try {
> graphData = graphDataService.getChartData(dataId);
> } catch (GraphDataFailureException e) {
> // TODO Need to report error to user somehow
>
> }
> //This method just builds a String in the format required
> for JQplot
> String jsVar = buildChartDataAsJavaScriptVariable(graphData);
> String chartTitle = graphData.getTitle();
> List<String> namesOfSeriesOnGraph =
> graphData.getNamesOfGraphSeries();
>
> String legendNames =
> Arrays.toString(namesOfSeriesOnGraph.toArray(new
> String[namesOfSeriesOnGraph.size()]));
>
> String javaScriptFunctionCall=
> "buildChart('chartDivContainer',[" + jsVar
> + "],'" + chartTitle + ", " + legendNames + ")";
>
> target.appendJavaScript(javaScriptFunctionCall);
> }
> }
>
> I want the abstract Behaviour added to the panel above to provide me with
> some javaScript so that I can call back to Wicket. This javaScript is
> not
> added to the mark up. When I paste the url from the getCallbackUrl()
> into
> the browser but I get XML back:
>
> <ajax-response><evaluate
> encoding="wicket1">buildChart('chartDivContainer',[[[1351617360000,
> 22.700006].....all my graph data.
>
> Can anyone point me in the right direction as to what I have to do here
> or
> as to what I've missed? Are there any examples that demonstrate how this
> is
> done? Also how can I handle exceptions thrown back from the service?
> That
> is, present some feedback to the user. Hopefully that is all clear
> enough,
> feel free to ask if you need more information.
>
> Many thanks.
>
>
>
> --
> View this message in context:
> http://apache-wicket.1842946.n4.nabble.com/Call-Wicket-repeatedly-from-JQplot-Jquery-based-graphing-framework-tp4653472.html
> Sent from the Users forum mailing list archive at Nabble.com.
>
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