There are two approaches you can take with this: either insert your data
into the page server-side, or use an AJAX request client-side to
dynamically fetch the data.
Since you already have a servlet that serves up a JSON object, using AJAX
should be simple enough. I recommend using a javascript library like
jQuery or Mootools (whatever works best for you) to handle the AJAX work,
since writing AJAX in plain javascript can be a bit of a pain. Here's an
example using jQuery:
function drawChart() {
$.ajax({
url: '/path/to/servlet',
dataType: 'json',
data: {
// key: value pairs for whatever data you need to send to the
server, if any
},
success: function (json) {
// assumes json is a DataTable-compatible JSON string
var data = new google.visualization.DataTable(json);
var chart = new
google.visualization.ColumnChart(document.querySelector('#chart_div'));
chart.draw(data, {
// chart options
height: 400,
width: 600
});
}
});
}
google.load('visualization', '1', { 'packages': ['corechart'], callback:
drawChart});
This example draws a ColumnChart in a div with the id "chart_div". It
assumes that your JSON is in the correct format for the Visualization API
to use; if your data is in a different format, then you either need to
change the JSON format, or you need to parse the JSON into a DataTable
manually in javascript. If you post an example of the JSON your servlet
creates, I can help you with either approach.
On Wednesday, August 6, 2014 1:24:28 AM UTC-4, George Rosario wrote:
>
> Hi. I am new to google charts , I am building a simple application which
> takes data from mysql database into a servlet and forms a JSON object ,
> Which is passed to XHTML file where i want to display a coloum chart using
> that JSON object. I am able to create a JSON object in java. But i dont
> know how to send the JSON object from servlet to XHTML and use that object
> to generate the chart , Can anybody help?
> Thanks in ADVANCE....
>
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