How to get Piwik Json Data and use it with chart.js? - json

Question

I use the piwik php api to generate data like this:
[
{"label":"1680x1050","nb_visits":9,"nb_actions":53,"max_actions":27,"sum_visit_length":3051,"bounce_count":3,"nb_visits_converted":0,"sum_daily_nb_uniq_visitors":7,"sum_daily_nb_users":0,"segment":"resolution==1680x1050"},
{"label":"1440x900","nb_visits":1,"nb_actions":1,"max_actions":1,"sum_visit_length":0,"bounce_count":1,"nb_visits_converted":0,"sum_daily_nb_uniq_visitors":1,"sum_daily_nb_users":0,"segment":"resolution==1440x900"}
]
and i want to use chart.js to visualize this data, at the moment my code looks like this and doesn't work:
var chartjsData = [];
var chartjsLabel = [];
$.getJSON("piwik.php", function (json) {
///src = http://stackoverflow.com/questions/24696329/how-to-use-json-data-in-chart-js
for (var i = 0; i < json.length; i++) {
chartjsData.push(json[i].nb_visits);
chartjsLabel.push(json[i].label);
}
});
var barChartData = {
labels :[chartjsLabel],datasets : [
{
fillColor : "rgba(220,280,220,0.5)",
strokeColor : "rgba(220,220,220,1)",
data : chartjsData
}
]
};
var ctx = document.getElementById("myChart").getContext("2d");
var myChart = new Chart(ctx, {
type: 'bar',
data: barChartData,
});
can maybe someone give me a working example how to work with chart.js and piwik's json data, or a hint how to get this working, thanks alot!

Answer 1

I got it like this:
var label = [];
var data = [];
$.getJSON("piwik.php", function (json) {
for (var i = 0; i < json.length; i++) {
label.push(json[i].label);
data.push(json[i].nb_visits);
}
graph();
});
function graph(){
var ctx = document.getElementById("myChart");
var myChart = new Chart(ctx, {
type: 'bar',
data: {
labels: label,
datasets: [{
label: '',
data: data,
backgroundColor: [
'rgba(255, 99, 132, 0.2)',
],
borderColor: [
'rgba(255,99,132,1)',
],
borderWidth: 1
}]
},
options: {
}
});
};