I don't use a barchart but one of the others visualizations with GWT,
maybe this will help.
Create a Timer (com.google.gwt.user.client.Timer), use this to update
your barchart after the initial load.
On start of your Composite, call a method that does the following
1. Call a method that retrieves your data and initializes your
barchart (setServices in my code)
2. Also create a timer that will update the data for your barchart
t = new Timer() {
public void run() {
retrieveGaugeData();
if(gauge != null) {
gauge.draw(createGaugeData(), createGaugeOptions());
}
}
};
t.scheduleRepeating(5000);
Method setServices (retrieves data initially and initializes my
visualization)
1. Retrieves your data, I use an RPC call to pull this data from the
server which in turn pulls it from MySQL and returns it
2. Create your barchart (in my case a Gauge), note I'm also using
SmartGWT so adding it to the canvas may be a little different.
Runnable onLoadCallback = new Runnable() {
public void run() {
gauge = new Gauge(createGaugeData(), createGaugeOptions());
gauge.setWidth("80%");
Canvas c = new Canvas();
c.setID("sys_gauge_canvas");
c.setWidth100();
c.setHeight("30%");
c.addChild(gauge);
addMember(c, 0);
}
};
VisualizationUtils.loadVisualizationApi("1.1", onLoadCallback,
Gauge.PACKAGE);
On Dec 27 2010, 2:27 am, Atif Mir <[email protected]> wrote:
> Hi All,
>
> Could some one please post some example code as how a bar chart could be
> created from datasource coming from MYSQL db or MSSQL db ?
>
> Thanks
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