blocks|key|289937|text|我不认为现在是可能的。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|289938|然而，正如作者在这里暗示的那样，这是一个应该很快就会出现的功能：https://github.com/nnnick/Chart.js/issues/161#issuecomment-20487775|offset|length|289939|entityMap|0|LINK|mutability|MUTABLE|url|https://github.com/nnnick/Chart.js/issues/161#issuecomment-20487775^0|0|W|1V|0|0^^$0|@$1|2|3|4|5|6|7|N|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|O|8|@]|9|@$D|P|E|Q|1|R]]|A|$]]|$1|F|3|-4|5|6|7|S|8|@]|9|@]|A|$]]]|G|$H|$5|I|J|K|A|$L|M]]]]

<p>I don't think it's possible right now.</p>

<p>However that's a feature which should come soon, as the author hinted here:
<a href="https://github.com/nnnick/Chart.js/issues/161#issuecomment-20487775" rel="nofollow">https://github.com/nnnick/Chart.js/issues/161#issuecomment-20487775</a></p>


blocks|key|72637|text|删除画布dom并重新添加。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|72638|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
++++});
}|code-block|syntax|javascript|72639|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

<p>Remove the canvas dom and add in again.</p>

<pre><code>function renderChart(label,data){

    $("#canvas-wrapper").html("").html('&lt;canvas id="storeSends"&gt;&lt;/canvas&gt;');
    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
    });
}
</code></pre>


blocks|key|72658|text|您还可以使用destroy()函数。像这样|type|unstyled|depth|inlineStyleRanges|entityRanges|data|72659|+if(+window.myBar!==undefined)
+++++window.myBar.destroy();
+var+ctx+=+document.getElementById("canvas").getContext("2d");
+window.myBar+=+new+Chart(ctx).Bar(barChartData,+{
+++++responsive+:+true,
+});|code-block|syntax|javascript|72660|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

<p>You also can use destroy() function. Like this</p>

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


blocks|key|290062|text|以下是如何在最新版本的ChartJs中执行此操作：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|290063|setInterval(function(){
++++chart.data.datasets[0].data[5]+=+80;
++++chart.data.labels[5]+=+"Newly+Added";
++++chart.update();
}|code-block|syntax|javascript|290064|看看这个clear+video|offset|length|290065|或者在jsfiddle中测试它|290066|entityMap|0|LINK|mutability|MUTABLE|url|https://www.youtube.com/watch?v=De-zusP8QVM|1|https://jsfiddle.net/red_stapler/u5aanta8/1/^0|0|0|4|B|0|0|3|8|1|0^^$0|@$1|2|3|4|5|6|7|W|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|X|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|Y|8|@]|9|@$I|Z|J|10|1|11]]|A|$]]|$1|K|3|L|5|6|7|12|8|@]|9|@$I|13|J|14|1|15]]|A|$]]|$1|M|3|-4|5|6|7|16|8|@]|9|@]|A|$]]]|N|$O|$5|P|Q|R|A|$S|T]]|U|$5|P|Q|R|A|$S|V]]]]

<p>Here is how to do it in the last version of ChartJs:</p>

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

<p>Look at this <a href="https://www.youtube.com/watch?v=De-zusP8QVM">clear video</a></p>

<p>or test it in <a href="https://jsfiddle.net/red_stapler/u5aanta8/1/">jsfiddle</a></p>


blocks|key|72756|text|您只需更改chartObject.data.datasets值并调用update()，如下所示：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|72757|chartObject.data.datasets+=+newData.datasets;
chartObject.data.labels+=+newData.labels;
chartObject.update();|code-block|syntax|javascript|72758|entityMap^0|5|P|Y|8|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@$9|N|A|O|B|C]|$9|P|A|Q|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|R|8|@]|D|@]|E|$I|J]]|$1|K|3|-4|5|6|7|S|8|@]|D|@]|E|$]]]|L|$]]

<p>You just need to change the <code>chartObject.data.datasets</code> value and call <code>update()</code> like this:</p>

<pre><code>chartObject.data.datasets = newData.datasets;
chartObject.data.labels = newData.labels;
chartObject.update();
</code></pre>


blocks|key|72788|text|如果destroy()和clear()不起作用(就像我所经历的那样)，您可以使用jquery删除画布并重新添加它。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|72789|++++$('#chartAmazon').remove();
++++$('#chartBar').append('<canvas+id="chartAmazon"></canvas>');

++++var+ctxAmazon+=+$("#chartAmazon").get(0).getContext("2d");
++++++var+AmazonChart+=+new+Chart(ctxAmazon,+{
++++++++type:+'doughnut',
++++++++data:+dataAmazon,
++++++++options:+optionsA
++++});|code-block|syntax|javascript|72790|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

<p>If destroy() and clear() is not working (just like what i had experience) you can use jquery to remove the canvas and append it again.</p>

<pre><code>    $('#chartAmazon').remove();
    $('#chartBar').append('&lt;canvas id="chartAmazon"&gt;&lt;/canvas&gt;');

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


blocks|key|72836|text|最简单的方法是替换canvas元素，然后再次调用new+Chart()：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|72837|function+reloadMyChart()+{
++++$('myChart').replaceWith('<canvas+id="myChart"></canvas>');
++++new+Chart(document.getElementById("myChart"),+{
++++++++data:+yourChartData,
++++++++type:+yourChartType,
++++++++options:+yourChartOptions
++++});
}|code-block|syntax|javascript|72838|当然，您必须将yourChartData、yourChartType和yourChartOptions替换为初始化Chart.js所需的正确值。参见Chart.js+Docs。|offset|length|72839|您可以在按钮单击或所需的任何其他事件上调用reloadMyChart函数。您可能会向此函数添加参数，并使用这些参数进行REST调用以动态更新图表，如下所示：|72840|function+reloadMyChart(param1,+param2)+{
++++$('myChart').replaceWith('<canvas+id="myChart"></canvas>');
++++$.get("restUrl?param1="+%2B+param1+%2B+"&param2="+%2B+param2+%2B+",
++++++++function(data)+{
++++++++++++//+call+new+Chart()+here+and+use+returned+data
++++++++}
++++);|72841|希望能有所帮助！=)|72842|entityMap|0|LINK|mutability|MUTABLE|url|http://www.chartjs.org/docs^0|0|0|22|D|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|Y|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|Z|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|10|8|@]|9|@$I|11|J|12|1|13]]|A|$]]|$1|K|3|L|5|6|7|14|8|@]|9|@]|A|$]]|$1|M|3|N|5|D|7|15|8|@]|9|@]|A|$E|F]]|$1|O|3|P|5|6|7|16|8|@]|9|@]|A|$]]|$1|Q|3|-4|5|6|7|17|8|@]|9|@]|A|$]]]|R|$S|$5|T|U|V|A|$W|X]]]]

<p>The simplest way is to replace the canvas element and then call new Chart() again:</p>

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

<p>Of course, you must replace yourChartData, yourChartType and yourChartOptions with the correct values required to initialize Chart.js. See <a href="http://www.chartjs.org/docs" rel="nofollow noreferrer">Chart.js Docs</a>.</p>

<p>You can call reloadMyChart function on a button click or any other event you need. Probably you'll add parameters to this function and use these to make a REST call to dynamically update your chart, like this:</p>

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

<p>Hope it helps! =)</p>


blocks|key|72894|text|我认为最简单的方法是编写一个函数来更新图表，包括chart.update()方法。查看我用jsfiddle为条形图编写的this简单示例。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|72895|​|72896|//value+for+x-axis
var+emotions+=+["calm",+"happy",+"angry",+"disgust"];

//colours+for+each+bar
var+colouarray+=+['red',+'green',+'yellow',+'blue'];

//Let's+initialData[]+be+the+initial+data+set
var+initialData+=+[0.1,+0.4,+0.3,+0.6];

//Let's+updatedDataSet[]+be+the+array+to+hold+the+upadted+data+set+with+every+update+call
var+updatedDataSet;

/*Creating+the+bar+chart*/
var+ctx+=+document.getElementById("barChart");
var+barChart+=+new+Chart(ctx,+{
++type:+'bar',
++data:+{
++++labels:+emotions,
++++datasets:+[{
++++++backgroundColor:+colouarray,
++++++label:+'Prediction',
++++++data:+initialData
++++}]
++},
++options:+{
++++scales:+{
++++++yAxes:+[{
++++++++ticks:+{
++++++++++beginAtZero:+true,
++++++++++min:+0,
++++++++++max:+1,
++++++++++stepSize:+0.5,
++++++++}
++++++}]
++++}
++}
});

/*Function+to+update+the+bar+chart*/
function+updateBarGraph(chart,+label,+color,+data)+{
++chart.data.datasets.pop();
++chart.data.datasets.push({
++++label:+label,
++++backgroundColor:+color,
++++data:+data
++});
++chart.update();
}

/*Updating+the+bar+chart+with+updated+data+in+every+second.+*/
setInterval(function()+{
++updatedDataSet+=+[Math.random(),+Math.random(),+Math.random(),+Math.random()];
++updateBarGraph(barChart,+'Prediction',+colouarray,+updatedDataSet);
},+1000);|code-block|syntax|javascript|72897|<html>

<head>
++<script+src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/2.3.0/Chart.min.js"></script>

<body>
++++<div>
++++++<h1>Update+Bar+Chart</h1>
++++++<canvas+id="barChart"+width="800"+height="450"></canvas>
++++</div>
++++<script+src="barchart.js"></script>
++</body>
++
</head>

</html>|72898|72899|希望这能有所帮助。|72900|entityMap|0|LINK|mutability|MUTABLE|url|https://jsfiddle.net/iamarasekera/oek1wan2/^0|O|E|1O|4|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|Z|8|@$9|10|A|11|B|C]]|D|@$9|12|A|13|1|14]]|E|$]]|$1|F|3|G|5|6|7|15|8|@]|D|@]|E|$]]|$1|H|3|I|5|J|7|16|8|@]|D|@]|E|$K|L]]|$1|M|3|N|5|J|7|17|8|@]|D|@]|E|$K|L]]|$1|O|3|G|5|6|7|18|8|@]|D|@]|E|$]]|$1|P|3|Q|5|6|7|19|8|@]|D|@]|E|$]]|$1|R|3|-4|5|6|7|1A|8|@]|D|@]|E|$]]]|S|$T|$5|U|V|W|E|$X|Y]]]]

<p>I think the easiest way is to write a function to update your chart including the <code>chart.update()</code>method. Check out <a href="https://jsfiddle.net/iamarasekera/oek1wan2/" rel="noreferrer">this</a> simple example I wrote in jsfiddle for a Bar Chart.</p>

<p><div class="snippet" data-lang="js" data-hide="false" data-console="true" data-babel="false">
<div class="snippet-code">
<pre class="snippet-code-js lang-js prettyprint-override"><code>//value for x-axis
var emotions = ["calm", "happy", "angry", "disgust"];

//colours for each bar
var colouarray = ['red', 'green', 'yellow', 'blue'];

//Let's initialData[] be the initial data set
var initialData = [0.1, 0.4, 0.3, 0.6];

//Let's updatedDataSet[] be the array to hold the upadted data set with every update call
var updatedDataSet;

/*Creating the bar chart*/
var ctx = document.getElementById("barChart");
var barChart = new Chart(ctx, {
  type: 'bar',
  data: {
    labels: emotions,
    datasets: [{
      backgroundColor: colouarray,
      label: 'Prediction',
      data: initialData
    }]
  },
  options: {
    scales: {
      yAxes: [{
        ticks: {
          beginAtZero: true,
          min: 0,
          max: 1,
          stepSize: 0.5,
        }
      }]
    }
  }
});

/*Function to update the bar chart*/
function updateBarGraph(chart, label, color, data) {
  chart.data.datasets.pop();
  chart.data.datasets.push({
    label: label,
    backgroundColor: color,
    data: data
  });
  chart.update();
}

/*Updating the bar chart with updated data in every second. */
setInterval(function() {
  updatedDataSet = [Math.random(), Math.random(), Math.random(), Math.random()];
  updateBarGraph(barChart, 'Prediction', colouarray, updatedDataSet);
}, 1000);</code></pre>
<pre class="snippet-code-html lang-html prettyprint-override"><code>&lt;html&gt;

&lt;head&gt;
  &lt;script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/2.3.0/Chart.min.js"&gt;&lt;/script&gt;

&lt;body&gt;
    &lt;div&gt;
      &lt;h1&gt;Update Bar Chart&lt;/h1&gt;
      &lt;canvas id="barChart" width="800" height="450"&gt;&lt;/canvas&gt;
    &lt;/div&gt;
    &lt;script src="barchart.js"&gt;&lt;/script&gt;
  &lt;/body&gt;
  
&lt;/head&gt;

&lt;/html&gt;</code></pre>
</div>
</div>
</p>

<p>Hope this helps.</p>


blocks|key|72937|text|Showing+realtime+update+chartJS|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|72938|function+add_data(chart,+label,+data)+
++++++{
++++++++var+today+=+new+Date();
++++++++var+time+=+today.getHours()+%2B+":"+%2B+today.getMinutes()+%2B+":"+%2B+today.getSeconds();
++++++++myLineChart.data.datasets[0].data.push(Math.random()+*+100);
++++++++myLineChart.data.datasets[1].data.push(Math.random()+*+100);
++++++++myLineChart.data.labels.push(time)
++++++++myLineChart.update();
++++++}
++++++setInterval(add_data,+10000);+//milisecond|code-block|syntax|javascript|72939|完整代码，您可以在描述链接中下载|72940|entityMap|0|LINK|mutability|MUTABLE|url|https://www.youtube.com/watch?v=yRghCnmAjhY^0|0|V|0|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@$A|T|B|U|1|V]]|C|$]]|$1|D|3|E|5|F|7|W|8|@]|9|@]|C|$G|H]]|$1|I|3|J|5|6|7|X|8|@]|9|@]|C|$]]|$1|K|3|-4|5|6|7|Y|8|@]|9|@]|C|$]]]|L|$M|$5|N|O|P|C|$Q|R]]]]

<p><a href="https://www.youtube.com/watch?v=yRghCnmAjhY" rel="nofollow noreferrer">Showing realtime update chartJS</a></p>

<pre><code>function add_data(chart, label, data) 
      {
        var today = new Date();
        var time = today.getHours() + ":" + today.getMinutes() + ":" + today.getSeconds();
        myLineChart.data.datasets[0].data.push(Math.random() * 100);
        myLineChart.data.datasets[1].data.push(Math.random() * 100);
        myLineChart.data.labels.push(time)
        myLineChart.update();
      }
      setInterval(add_data, 10000); //milisecond
</code></pre>

<p>full code , you can download in description link</p>


blocks|key|72984|text|至少有两种方法可以解决这个问题：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|72985|1)+chart.update()|offset|length|style|CODE|72986|2)使用chart.destroy()删除已有图表并创建新的图表对象。|72987|entityMap^0|0|3|E|0|0^^$0|@$1|2|3|4|5|6|7|L|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|M|8|@$D|N|E|O|F|G]]|9|@]|A|$]]|$1|H|3|I|5|6|7|P|8|@]|9|@]|A|$]]|$1|J|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|K|$]]

<p>There's at least 2 ways of solve it:</p>

<p>1) <code>chart.update()</code></p>

<p>2) Delete existing chart using chart.destroy() and create new chart object.</p>


blocks|key|73034|text|您可以使用Chart.instances查看Chart实例。这将为您提供所有图表实例。现在，您可以在该实例上迭代，并更改配置中的数据。假设您的页面中只有一个图表。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|73035|for+(var+_chartjsindex+in+Chart.instances)+{
/*+
+*+Here+in+the+config+your+actual+data+and+options+which+you+have+given+at+the+
+++time+of+creating+chart+so+no+need+for+changing+option+only+you+can+change+data
*/
+Chart.instances[_chartjsindex].config.data+=+[];
+//+here+you+can+give+add+your+data
+Chart.instances[_chartjsindex].update();
+//+update+will+rewrite+your+whole+chart+with+new+value
+}|code-block|syntax|javascript|73036|entityMap^0|5|F|M|5|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@$9|N|A|O|B|C]|$9|P|A|Q|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|R|8|@]|D|@]|E|$I|J]]|$1|K|3|-4|5|6|7|S|8|@]|D|@]|E|$]]]|L|$]]

<p>You can check instance of <code>Chart</code> by using <code>Chart.instances</code>.
This will give you all the charts instances.
Now you can iterate on that instances and and change the data, which is present inside config.
suppose you have only one chart in your page.</p>
<pre><code>for (var _chartjsindex in Chart.instances) {
/* 
 * Here in the config your actual data and options which you have given at the 
   time of creating chart so no need for changing option only you can change data
*/
 Chart.instances[_chartjsindex].config.data = [];
 // here you can give add your data
 Chart.instances[_chartjsindex].update();
 // update will rewrite your whole chart with new value
 }
</code></pre>


<p>I created an basic bar chart using chartjs and it works fine. Now I want to update the values on a time based interval. My problem is that after I created the chart, I do not know how to update its values correctly...</p>

<p>My code:</p>

<pre><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);
</code></pre>

<p>in the test code, I am updating the values with <code>datasets[0].data</code>- is this the right way to do it? The problem with this is that everytime I call <code>chart.Bar()</code>, the values are reset to 0 then animated to the random value (like I am recreating the chart). This way, all animations are always from 0 to value which looks strange. I would expect that if I update a value from 50 to 10 the bar would go down to 10 from 50 and not setted to 0 then animated to 10.</p>

<p>I did not found anything in the docs about this... am I doing something wrong or this is impossible with this library?</p>


Dynamically update values of a chartjs chart

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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我使用chartjs创建了一个基本的条形图，它工作得很好。现在，我想以基于时间的间隔更新值。我的问题是，在我创建图表之后，我不知道如何正确地更新它的值……我的代码：var ctx = $("#myChart").get(0).getContext("2d");var dts = [    {        fillCo...

问动态更新chartjs图表的值
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