charts - tutorial - Actualizar dinámicamente los valores de un gráfico chartjs

set data chart js

Question

Creé un gráfico de barras básico usando chartjs y funciona bien. Ahora quiero actualizar los valores en un intervalo basado en el tiempo. Mi problema es que después de crear el gráfico, no sé cómo actualizar sus valores correctamente ...

Mi código:

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);

en el código de prueba, estoy actualizando los valores con datasets[0].data - ¿es esta la manera correcta de hacerlo? El problema con esto es que cada vez que llamo chart.Bar() , los valores se restablecen a 0 y luego se animan al valor aleatorio (como estoy recreando el gráfico). De esta forma, todas las animaciones son siempre de 0 a valor, lo que parece extraño. Esperaría que si actualizo un valor de 50 a 10, la barra bajaría a 10 de 50 y no se configuraría a 0, luego se animaría a 10.

No encontré nada en los documentos sobre esto ... ¿estoy haciendo algo mal o esto es imposible con esta biblioteca?

Answer 1

Aquí es cómo hacerlo en la última versión de ChartJs:

setInterval(function(){
    chart.data.datasets[0].data[5] = 80;
    chart.data.labels[5] = "Newly Added";
    chart.update();
}

Mira este video claro

o probarlo en jsfiddle

Answer 2

De acuerdo con la documentación, ahora hay un método update () que volverá a dibujar el gráfico.

.update ()

Al llamar a update () en su instancia de Chart, se volverá a representar el gráfico con cualquier valor actualizado, lo que le permitirá editar el valor de múltiples puntos existentes y luego representarlos en un ciclo de renderizado animado.

myBarChart.datasets[0].bars[2].value = 50;
// Would update the first dataset''s value of ''March'' to be 50
myBarChart.update();
// Calling update now animates the position of March from 90 to 50.

Answer 3

La forma más sencilla es reemplazar el elemento canvas y luego volver a llamar a Chart () nuevo:

function reloadMyChart() {
    $(''myChart'').replaceWith(''<canvas id="myChart"></canvas>'');
    new Chart(document.getElementById("myChart"), {
        data: yourChartData,
        type: yourChartType,
        options: yourChartOptions
    });
}

Por supuesto, debe reemplazar suChartData, yourChartType y yourChartOptions con los valores correctos necesarios para inicializar Chart.js. Ver los documentos de Chart.js

Puede llamar a la función reloadMyChart haciendo clic en un botón o en cualquier otro evento que necesite. Probablemente agregará parámetros a esta función y los usará para realizar una llamada REST para actualizar dinámicamente su tabla, como esta:

function reloadMyChart(param1, param2) {
    $(''myChart'').replaceWith(''<canvas id="myChart"></canvas>'');
    $.get("restUrl?param1=" + param1 + "&param2=" + param2 + ",
        function(data) {
            // call new Chart() here and use returned data
        }
    );

¡Espero eso ayude! =)

Answer 4

No creo que sea posible en este momento.

Sin embargo, esa es una característica que debería llegar pronto, como lo insinuó el autor aquí: https://github.com/nnnick/Chart.js/issues/161#issuecomment-20487775

Answer 5

Retire el lienzo dom y agregue de nuevo.

function renderChart(label,data){

    $("#canvas-wrapper").html("").html(''<canvas id="storeSends"></canvas>'');
    var lineChartData = {
        labels : label,
        datasets : [
            {
                fillColor : "rgba(49, 195, 166, 0.2)",
                strokeColor : "rgba(49, 195, 166, 1)",
                pointColor : "rgba(49, 195, 166, 1)",
                pointStrokeColor : "#fff",
                data : data
            }
        ]

    }
    var canvas = document.getElementById("storeSends");
    var ctx = canvas.getContext("2d");

    myLine = new Chart(ctx).Line(lineChartData, {
        responsive: true,
        maintainAspectRatio: false
    });
}

Answer 6

Si destroy () y clear () no funciona (al igual que lo que tuve), puede usar jquery para eliminar el lienzo y anexarlo nuevamente.

    $(''#chartAmazon'').remove();
    $(''#chartBar'').append(''<canvas id="chartAmazon"></canvas>'');

    var ctxAmazon = $("#chartAmazon").get(0).getContext("2d");
      var AmazonChart = new Chart(ctxAmazon, {
        type: ''doughnut'',
        data: dataAmazon,
        options: optionsA
    });

Answer 7

Solo necesita cambiar el valor de chartObject.data.datasets y llamar a update() esta manera:

chartObject.data.datasets = newData.datasets;
chartObject.data.labels = newData.labels;
chartObject.update();

Answer 8

También puede usar la función destroy (). Me gusta esto

 if( window.myBar!==undefined)
     window.myBar.destroy();
 var ctx = document.getElementById("canvas").getContext("2d");
 window.myBar = new Chart(ctx).Bar(barChartData, {
     responsive : true,
 });

Answer 9

Tan simple, solo reemplace el elemento del lienzo del gráfico.

$ (''# canvas''). replaceWith (''id = "canvas" height = "200px" width = "368px">'');

Answer 10

Actualización: parece que se ha actualizado charjs (ver comentario a continuación). Hay algunos ejemplos que se ven muy bien:

1. Aquí hay un ejemplo de actualización de un gráfico de líneas con datos nuevos: http://jsbin.com/yitep/5/edit
2. Así es como podemos actualizar los datos existentes en un gráfico de líneas: http://jsbin.com/yitep/4/edit

Publicación original

A partir de noviembre de 2013, parece haber muy pocas opciones para actualizar los gráficos.

Aquí hay un buen ejemplo (duplicado a continuación) de agregar nuevos puntos a un gráfico de líneas. Todavía un poco nervioso, pero no está mal. Sin embargo, creo que el efecto probablemente depende de la tabla que estés usando.

Parece que esto está en algún lugar de la cartera de desarrollo. Sin embargo, todavía no veo ninguna indicación de una fecha de lanzamiento: https://github.com/nnnick/Chart.js/issues/13

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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0,0),b.restore()):b.fillText(a.labels[d],n+d*m,p+c.scaleFontSize+3),b.beginPath(),b.moveTo(n+d*m,p+3),c.scaleShowGridLines&&0<d?(b.lineWidth=c.scaleGridLineWidth,b.strokeStyle=c.scaleGridLineColor,b.lineTo(n+d*m,5)):b.lineTo(n+d*m,p+3),b.stroke();b.lineWidth=c.scaleLineWidth;b.strokeStyle=c.scaleLineColor;b.beginPath();b.moveTo(n,p+5);b.lineTo(n,5);b.stroke();b.textAlign="right";b.textBaseline="middle";for(d=0;d<j.steps;d++)b.beginPath(),b.moveTo(n-3,p-(d+1)*k),c.scaleShowGridLines?(b.lineWidth=c.scaleGridLineWidth,
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e(f,g),n+m*g,e(f,g)):b.lineTo(n+m*g,e(f,g));b.stroke();c.datasetFill?(b.lineTo(n+m*(a.datasets[f].data.length-1),p),b.lineTo(n,p),b.closePath(),b.fillStyle=a.datasets[f].fillColor,b.fill()):b.closePath();if(c.pointDot){b.fillStyle=a.datasets[f].pointColor;b.strokeStyle=a.datasets[f].pointStrokeColor;b.lineWidth=c.pointDotStrokeWidth;for(g=0;g<a.datasets[f].data.length;g++)b.beginPath(),b.arc(n+m*g,p-d*v(a.datasets[f].data[g],j,k),c.pointDotRadius,0,2*Math.PI,!0),b.fill(),b.stroke()}}},b)},L=function(a,
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HTML

<html>
    <head>
        <script src="//ajax.googleapis.com/ajax/libs/jquery/1.9.1/jquery.min.js"></script>
    </head>
    <body>
        <h1>Live Updating Chart.js</h1>

        <canvas id="myChart" width="400" height="150"></canvas>


    </body>
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