extjs error on filling store - json

Question

I have a java map. I converted it to json string and I obtain something like this :
{"NEW ZEALAND":"111111111111111","CHAD":"1","MOROCCO":"111","LATVIA":"11"}
Now I want to use it in a store and then a chart like the following code but it's not working. I have no error just no display.
var obj = Ext.Ajax.request({
url: App.rootPath + '/controller/home/dashboard/test.json',
method:'GET',
success: function(response) {
return Ext.JSON.decode(response.responseText);
}
});
var store2 = Ext.create('Ext.data.Store', {
model: 'PopulationPoint',
data: obj
});
Ext.create('Ext.chart.Chart', {
renderTo: 'infos2',
width: 500,
height: 300,
store: store2,
series: [
{
type: 'pie',
field: 'population',
label: {
field: 'state',
display: 'rotate',
font: '12px Arial'
}
}
]
});

Answer 1

The AJAX request is asynchronous. As such, the obj variable used to initialize your data won't contain your data yet.
One option is to create the store2 variable and create the chart directly in the success callback of the AJAX request.
A cleaner option would be to configure the store with a proxy to load the url, and in the callback create the chart.
EDIT
The JSON response does not contain the fields that are declared in your model (sent in the comments). Update the JSON to return a properly formatted model and the chart should work as seen in this fiddle. The JSON should look something like
[
{
"state" : "New Zealand",
"population" : 111111111
},
{
"state" : "Chad",
"population" : 1
}
]