Mettre à jour dynamiquement les valeurs d'un graphique Chartjs

J'ai créé un graphique à barres de base en utilisant chartjs et cela fonctionne très bien. Maintenant, je veux mettre à jour les valeurs sur un intervalle de temps. Mon problème est qu'après avoir créé le graphique, je ne sais pas comment mettre à jour correctement ses valeurs ...

Mon code:

var ctx = $("#myChart").get(0).getContext("2d");

var dts = [
    {
        fillColor: "rgba(220,220,220,0.5)",
        strokeColor: "rgba(220,220,220,1)",
        data: [0, 0, 0, 0, 0]
    }
];

var data = {
    labels: ["Core#1", "Core#2", "Core#3", "Core#4", "Total"],
    datasets: dts
};

var chart = new Chart(ctx);
chart.Bar(data);

//test code
setInterval( function () {                        
    data.datasets[0].data = [random(), random(), random(), random(), random()];
    chart.Bar(data);

},2000);

dans le code de test, je mets à jour les valeurs avec datasets[0].data- est-ce la bonne façon de procéder? Le problème avec ceci est que chaque fois que j'appelle chart.Bar(), les valeurs sont réinitialisées à 0 puis animées à la valeur aléatoire (comme je recrée le graphique). De cette façon, toutes les animations vont toujours de 0 à une valeur qui semble étrange. Je m'attendrais à ce que si je mette à jour une valeur de 50 à 10, la barre descendrait à 10 de 50 et ne serait pas réglée à 0 puis animée à 10.

Je n'ai rien trouvé dans la documentation à ce sujet ... est-ce que je fais quelque chose de mal ou est-ce impossible avec cette bibliothèque?

Mise à jour: il semble que chartjs ait été mis à jour (voir le commentaire ci-dessous). Il y a quelques exemples qui semblent très beaux:

1. Voici un exemple de mise à jour d'un graphique en courbes à l'aide de nouvelles données: http://jsbin.com/yitep/5/edit
2. Voici comment nous pouvons mettre à jour les données existantes sur un graphique linéaire: http://jsbin.com/yitep/4/edit

Message original

Depuis novembre 2013, il semble y avoir très peu d'options pour mettre à jour les graphiques.

Voici un bon exemple (reproduit ci-dessous) d'ajout de nouveaux points à un graphique en courbes. Encore un peu nerveux mais pas trop mal. Cependant, je pense que l'effet dépend probablement du graphique que vous utilisez.

Il semble que ce soit quelque part dans le pipeline de développement. Cependant, je ne vois pas encore d'indication de date de sortie: https://github.com/nnnick/Chart.js/issues/13 [Fermé le 26 juillet 2014]

JS

$(document).ready(function(){
  var count = 10;
  var data = {
      labels : ["1","2","3","4","5", "6", "7", "8", "9", "10"],
        datasets : [
          {
                fillColor : "rgba(220,220,220,0.5)",
                strokeColor : "rgba(220,220,220,1)",
                pointColor : "rgba(220,220,220,1)",
                pointStrokeColor : "#fff",
                data : [65,59,90,81,56,45,30,20,3,37]
            },
            {
                fillColor : "rgba(151,187,205,0.5)",
                strokeColor : "rgba(151,187,205,1)",
                pointColor : "rgba(151,187,205,1)",
                pointStrokeColor : "#fff",
                data : [28,48,40,19,96,87,66,97,92,85]
            }
        ]
  }
  // this is ugly, don't judge me
  var updateData = function(oldData){
    var labels = oldData["labels"];
    var dataSetA = oldData["datasets"][0]["data"];
    var dataSetB = oldData["datasets"][1]["data"];

    labels.shift();
    count++;
    labels.push(count.toString());
    var newDataA = dataSetA[9] + (20 - Math.floor(Math.random() * (41)));
    var newDataB = dataSetB[9] + (20 - Math.floor(Math.random() * (41)));
    dataSetA.push(newDataA);
    dataSetB.push(newDataB);
    dataSetA.shift();
    dataSetB.shift();    };

  var optionsAnimation = {
    //Boolean - If we want to override with a hard coded scale
    scaleOverride : true,
    //** Required if scaleOverride is true **
    //Number - The number of steps in a hard coded scale
    scaleSteps : 10,
    //Number - The value jump in the hard coded scale
    scaleStepWidth : 10,
    //Number - The scale starting value
    scaleStartValue : 0
  }

  // Not sure why the scaleOverride isn't working...
  var optionsNoAnimation = {
    animation : false,
    //Boolean - If we want to override with a hard coded scale
    scaleOverride : true,
    //** Required if scaleOverride is true **
    //Number - The number of steps in a hard coded scale
    scaleSteps : 20,
    //Number - The value jump in the hard coded scale
    scaleStepWidth : 10,
    //Number - The scale starting value
    scaleStartValue : 0
  }

  //Get the context of the canvas element we want to select
  var ctx = document.getElementById("myChart").getContext("2d");
  var optionsNoAnimation = {animation : false}
  var myNewChart = new Chart(ctx);
  myNewChart.Line(data, optionsAnimation);  

  setInterval(function(){
    updateData(data);
    myNewChart.Line(data, optionsNoAnimation)
    ;}, 2000
  );
});


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