Aktualisieren Sie dynamisch die Werte eines Diagramms

Ich habe mit chartjs ein einfaches Balkendiagramm erstellt, das einwandfrei funktioniert. Jetzt möchte ich die Werte in einem zeitbasierten Intervall aktualisieren. Mein Problem ist, dass ich nach dem Erstellen des Diagramms nicht weiß, wie ich seine Werte korrekt aktualisieren kann ...

Mein 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);

Im Testcode aktualisiere ich die Werte mit datasets[0].data- ist dies der richtige Weg, dies zu tun? Das Problem dabei ist, dass bei jedem Aufruf chart.Bar()die Werte auf 0 zurückgesetzt und dann auf den Zufallswert animiert werden (so wie ich das Diagramm neu erstelle ). Auf diese Weise sind alle Animationen immer von 0 bis zum Wert, was seltsam aussieht. Ich würde erwarten, dass wenn ich einen Wert von 50 auf 10 aktualisiere, der Balken von 50 auf 10 sinkt und nicht auf 0 gesetzt und dann auf 10 animiert wird.

Ich habe in den Dokumenten nichts darüber gefunden ... mache ich etwas falsch oder ist dies mit dieser Bibliothek unmöglich?

Update: Es sieht so aus, als ob chartjs aktualisiert wurde (siehe Kommentar unten). Es gibt einige Beispiele, die sehr schön aussehen:

1. Hier ist ein Beispiel für die Aktualisierung eines Liniendiagramms mit neuen Daten: http://jsbin.com/yitep/5/edit
2. So können wir vorhandene Daten in einem Liniendiagramm aktualisieren: http://jsbin.com/yitep/4/edit

Ursprünglicher Beitrag

Ab November 2013 gibt es anscheinend nur sehr wenige Optionen zum Aktualisieren von Diagrammen.

Hier gibt es ein gutes Beispiel (unten dupliziert) für das Hinzufügen neuer Punkte zu einem Liniendiagramm. Immer noch etwas nervös, aber nicht schlecht. Ich denke jedoch, dass der Effekt wahrscheinlich von dem Diagramm abhängt, das Sie verwenden.

Es sieht so aus, als ob dies irgendwo in der Entwicklungspipeline ist. Ich sehe jedoch noch keinen Hinweis auf ein Veröffentlichungsdatum: https://github.com/nnnick/Chart.js/issues/13 [Ab 26. Juli 2014 geschlossen]

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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