I have queried data from an external source using python, created a
DataTable using the library using *gviz_api* and then transformed into json
by using the .ToJSon method, problem is that when trying to create a graph
out of this the error "This table has no columns" keeps rising.
Here is the rellevant part of my script.
schema = [('id2',), ('id3',), ('id1',)]
data_gviz=[['556', '556', '556\n']]
#Load into a gv.DataTable
data_table = gv.DataTable(schema)
data_table.LoadData(data_gviz)
# Create a JSON string.
json_data = data_table.ToJSon()
return json_data
-----------------------
<script type="text/javascript">
// Load the Visualization API and the scatterplot package.
google.charts.load('current', {'packages':['corechart']});
// Set a callback to run when the Google Visualization API is loaded.
google.charts.setOnLoadCallback(drawChart);
function drawChart() {
var jsonData = $.ajax({
url: "getData.py",
dataType: "json",
async: false
}).responseText;
// Create our data table out of JSON data loaded from server.
var data = new google.visualization.DataTable(jsonData);
// Instantiate and draw our chart, passing in some options.
var chart = new google.visualization.PieChart(document.getElementById(
'chart_hbase'));
chart.draw(data, {width: 400, height: 240});
}
</script>
This error keeps appearing:
<https://lh3.googleusercontent.com/-tpzoxbQeQig/WbqjTh9VySI/AAAAAAAAGAI/U1jX9iatsOYGZwIij1A_rFBHNGyKHrEhACLcBGAs/s1600/Table_hasnocolumns.png>
Also I have tried to run as it is this example:
https://developers.google.com/chart/interactive/docs/php_example
and it doesnt seem to be working.
Any help is much appreciated.
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