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Chart.js折线图未显示。

chart.js
5

我用chart.js创建了一个折线图。然而，这个图表没有显示出来。下面是我的HTML代码：

    <canvas id="myChart" width"600" height:"600"></canvas>

以下是我的 JavaScript 代码。使用这种方法不会出现任何错误，但是没有显示任何内容。

var c = $('#myChart');
var ct = c.get(0).getContext('2d');
var ctx = document.getElementById("myChart").getContext("2d").Line(data);


var data = {
labels: ["January", "February", "March", "April", "May", "June", "July","August", "November", "December"],
datasets: [
    {
        label: "Sodium intake",
        fillColor: "rgba(220,220,220,0.2)",
        strokeColor: "rgba(220,220,220,1)",
        pointColor: "rgba(220,220,220,1)",
        pointStrokeColor: "#fff",
        pointHighlightFill: "#fff",
        pointHighlightStroke: "rgba(220,220,220,1)",
        data: [165, 159, 180, 181, 156, 155, 140]
    },
    {
        label: "Sugar intake",
        fillColor: "rgba(151,187,205,0.2)",
        strokeColor: "rgba(151,187,205,1)",
        pointColor: "rgba(151,187,205,1)",
        pointStrokeColor: "#fff",
        pointHighlightFill: "#fff",
        pointHighlightStroke: "rgba(151,187,205,1)",
        data: [128, 148, 140, 119, 186, 127, 190]
    }
]

};

我采用的另一种方法与文档类似。我实例化了一个新图表。但是，这种方法对我的线性图表返回未定义。

var ctx = document.getElementById("myChart").getContext("2d");
var myLineChart = new Chart(ctx).line(data,{
belzierCurve : false

});

3个回答
9

在你的HTML中：

<canvas id="myChart" width"600" height:"600"></canvas>

应该是：

<canvas id="myChart" width="600" height="600"></canvas>

然后，替换您的代码。
var c = $('#myChart');
var ct = c.get(0).getContext('2d');
var ctx = document.getElementById("myChart").getContext("2d").Line(data);

使用这段代码

var ctx = new Chart(document.getElementById("myChart").getContext("2d")).Line(data);

因此，在您的js中

var data = {
    //your data here
}
enter code here

在您的数据后面添加这行代码。
var ctx = new Chart(document.getElementById("myChart").getContext("2d")).Line(data);

所以你的代码应该像这样：
var data = {
  labels: ["January", "February", "March", "April", "May", "June", "July","August", "November", "December"],
  datasets: [
      {
          label: "Sodium intake",
          fillColor: "rgba(220,220,220,0.2)",
          strokeColor: "rgba(220,220,220,1)",
          pointColor: "rgba(220,220,220,1)",
          pointStrokeColor: "#fff",
          pointHighlightFill: "#fff",
          pointHighlightStroke: "rgba(220,220,220,1)",
          data: [165, 159, 180, 181, 156, 155, 140]
      },
      {
          label: "Sugar intake",
          fillColor: "rgba(151,187,205,0.2)",
          strokeColor: "rgba(151,187,205,1)",
          pointColor: "rgba(151,187,205,1)",
          pointStrokeColor: "#fff",
          pointHighlightFill: "#fff",
          pointHighlightStroke: "rgba(151,187,205,1)",
          data: [128, 148, 140, 119, 186, 127, 190]
      }
  ]
}

var ctx = new Chart(document.getElementById("myChart").getContext("2d")).Line(data);
2

好的，请尝试以下内容：

首先，纠正您的HTML代码：

<canvas id="myChart" width="600" height="600"></canvas>

如果您的 Javascript 有问题，请尝试以下方法：
var data = {
    "labels": ["January", "February", "March", "April", "May", "June", "July", "August", "November", "December"],
    "datasets": [{
        label: "Sodium intake",
        fillColor: "rgba(220,220,220,0.2)",
        strokeColor: "rgba(220,220,220,1)",
        pointColor: "rgba(220,220,220,1)",
        pointStrokeColor: "#fff",
        pointHighlightFill: "#fff",
        pointHighlightStroke: "rgba(220,220,220,1)",
        data: [165, 159, 180, 181, 156, 155, 140]
    }, {
        label: "Sugar intake",
        fillColor: "rgba(151,187,205,0.2)",
        strokeColor: "rgba(151,187,205,1)",
        pointColor: "rgba(151,187,205,1)",
        pointStrokeColor: "#fff",
        pointHighlightFill: "#fff",
        pointHighlightStroke: "rgba(151,187,205,1)",
        data: [128, 148, 140, 119, 186, 127, 190]
    }]
}

var chartDisplay = new Chart(document.getElementById("myChart").getContext("2d")).Line(data);

这样就可以了。看一下这个jsfiddle。

0
可能的原因是您正在使用最新的chart.min.js文件，但使用的是旧代码。为了正确引用，请遵循chartjs.org文档。
在最新版本中（我猜从2.3开始），代码配置结构已经发生了变化。
因此，不要再使用旧的代码结构，而应该按照新的文档进行配置。
var countries= document.getElementById("countries").getContext("2d");
var chart = new Chart(countries).Pie(pieData,pieOptions);

我们正在进行结构化设计，类似于：
var countries= document.getElementById("countries").getContext("2d");
var chart = new Chart(countries,{
  type: 'pie',
  data: 
  {
    labels: ['India', 'Germany', 'Netherland'],
    datasets: 
        [{
        backgroundColor: '#337ab7',
        data: ['100', '99' ,'98'],
        borderWidth:1,
        }]
  },
  options:
  {
      responsive: true,
      maintainAspectRatio:false,
      legend: {
        display: false,
        position: 'top'
      }
  }
});

或者

var countries= document.getElementById("countries").getContext("2d");
var pieData = 
{
    labels: ['India', 'Germany', 'Netherland'],
    datasets: [{
      backgroundColor: '#337ab7',
      data: ['100', '99' ,'98'],
      borderWidth:1,
      }]
};
var pieOptions = 
{
    responsive: true,
    maintainAspectRatio:false,
    legend: {
      display: false,
      position: 'top'
    }
};

var chart = new Chart(countries,{    
type: 'pie',
data: pieData,
options: pieOptions
});
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