I don't use GWT, but assuming your data source returns a JSON
representation of a DataTable object, then you could use something like
this (I use jQuery, but you can accomplish the same thing using vanilla JS
or other frameworks):
google.load('visualization', '1.0', {'packages': ['corechart']});
google.setOnLoadCallback(init);
function init () {
$('#myButton').click(function () {
// get parameters to submit to data source
var params;
// get data w/ AJAX call
$.ajax({
url: '/path/to/data.source',
data: params,
type: json,
success: function (json) {
var data = new google.visualization.DataTable(json);
var pie = new google.visualization.PieChart(document.
getElementById('pie_1_div'));
pie.draw(data, {/*options*/});
}
});
});
}
This will fetch data and redraw the chart every time the user clicks
'myButton'
On Friday, May 4, 2012 8:46:34 PM UTC-4, Vic wrote:
>
> Hi, please help me.
>
> I want to show a tab panel with two tabs. Each tab must to draw a
> piechart after the user select two dateboxes and push the button.
> These pie charts take data from the database and the pie charts must
> to change every time that the user push the button.
>
> At this time I have the asynchronous methods wich return the data,
> but I dont know :
>
> 1) where I must to draw the pie chart? maybe when i call a
> asynchronous method inside the on succes method ? or maybe in the
> asyncrhonous method I should return a variable which have the data
> from database or I dont know if i should use a data provider?
>
> 2) How I can refresh the tabs (pie charts) without the tabs is redraw.
>
> Thanks a lot
>
> Vic..
>
>
>
>
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