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Loading data dynamically with AJAX - wrapped in GWT #16

Closed GoogleCodeExporter closed 9 years ago

GoogleCodeExporter commented 9 years ago 
Hello
I just want to know if you are planning to implement dynamically loading
line graphs.
I mean the following example:
http://people.iola.dk/olau/flot/examples/ajax.html

Thank you,
Evgeny

Original issue reported on code.google.com by evge...@gmail.com on 16 Dec 2009 at 9:41

GoogleCodeExporter commented 9 years ago 
This is very easy to implement using gflot + GWT RPC. 

You can follow this example : 
http://code.google.com/p/gflot/source/browse/trunk/src/test/java/ca/nanometrics/
gflot
/client/example/DecimationExample.java

These are the basic steps:

1) Create an RPC service which returns a List<DataPoint> 
(http://code.google.com/webtoolkit/doc/latest/tutorial/RPC.html)

2) Poll the server periodically for new points

3) When you received the data from the server add the points to the gflot 
SeriesHandler and redraw the chart.

I hope this help you. Let me know if you have any questions.

Alex

Original comment by alexjdl on 17 Dec 2009 at 3:35

GoogleCodeExporter commented 9 years ago 
I think it would be useful to allow the pure JSON to be passed to the gflot 
plots 
instead of going through a heavier GWT RPC procedure with both client and 
server having 
knowledge of the DataPoint class in gflot.

Original comment by bljf...@gmail.com on 25 May 2010 at 10:17

GoogleCodeExporter commented 9 years ago 
You do not need to know DataPoint on server side. Here is my piece of code 
(SmartGWT) for dynamically loading DataPoints:

...
resultDS.fetchData(cr, new DSCallback(){
    public void execute(DSResponse response, Object rawData, DSRequest request) {
        if(response.getHttpResponseCode()==200){
            RecordList r = response.getDataAsRecordList();

            for(Record rec : r.toArray()){
                double x = rec.getAttributeAsDouble("t");
                double y = rec.getAttributeAsDouble("v");
                Timeline.series.add(new DataPoint(x, y));
            }

            Timeline.plot.redraw();
        }
    }
}, dsr);
...

Timeline is a class containing a plot object.

Original comment by bso...@gmail.com on 14 Feb 2012 at 9:34

GoogleCodeExporter commented 9 years ago 
It is now possible to get the json as a String from server using 
RPC/RequestBuilder/RF... and transform that String to SeriesData with :

SeriesData data = 
com.google.gwt.core.client.JsonUtils.safeEval(myJsonDataAsAString);
seriesHandler.setData(data);
plot.redraw();

Original comment by nmr.morel on 19 Jan 2013 at 4:52

GoogleCodeExporter commented 9 years ago

Original comment by nmr.morel on 19 Jan 2013 at 4:54

GoogleCodeExporter commented 9 years ago

Original comment by nmr.morel on 19 Jan 2013 at 4:54