Pajar Fathurrahman Pajar Fathurrahman - 4 months ago 35
Javascript Question

Chart area background color chartjs

I have problem with chart js, i want to coloring chart area like image above
enter image description here

I try to find configuration from charJs Docs , but nothing matched.
its possible or not to change chart area background color?
if possible anyone can help me?

Html

<canvas id="barChart" width="600" height="300"></canvas>


Javascript

var ctx = document.getElementById("barChart");
var barChart = new Chart(ctx,{
type: 'bar',
data: {
labels:["Label1","Label2","Label3","Label4"],
borderColor : "#fffff",
datasets: [
{
data: ["2","3","1","4"],
borderColor : "#fff",
borderWidth : "3",
hoverBorderColor : "#000",
backgroundColor: [
"#f38b4a",
"#56d798",
"#ff8397",
"#6970d5"
],
hoverBackgroundColor: [
"#f38b4a",
"#56d798",
"#ff8397",
"#6970d5"
]
}]
},
options: {
scales: {
yAxes: [{
ticks:{
min : 0,
stepSize : 1,
fontColor : "#000",
fontSize : 14
},
gridLines:{
color: "#000",
lineWidth:2,
zeroLineColor :"#000",
zeroLineWidth : 2
},
stacked: true
}],
xAxes: [{
ticks:{
fontColor : "#000",
fontSize : 14
},
gridLines:{
color: "#fff",
lineWidth:2
}
}]
},
responsive:false
}
});


Here's my current code jsFiddle

so everyone can try for find solution.
thanks for your help.

Answer

There is no built-in method to change background color, but you can use CSS. JSFiddle.

ctx.style.backgroundColor = 'rgba(255,0,0,255)';

EDIT

If you want to fill exact area of chart and no whole div, you can write your own chart.js plugin. Try it on JSFiddle.

        Chart.pluginService.register({
            beforeDraw: function (chart, easing) {
                if (chart.config.options.chartArea && chart.config.options.chartArea.backgroundColor) {
                    var helpers = Chart.helpers;
                    var ctx = chart.chart.ctx;
                    var chartArea = chart.chartArea;

                    ctx.save();
                    ctx.fillStyle = chart.config.options.chartArea.backgroundColor;
                    ctx.fillRect(chartArea.left, chartArea.top, chartArea.right - chartArea.left, chartArea.bottom - chartArea.top);
                    ctx.restore();
                }
            }
        });

        var config = {
  type: 'bar',
  data: {
    labels:["Label1","Label2","Label3","Label4"],
    borderColor : "#fffff",
    datasets: [
      {
        data: ["2","3","1","4"],
        borderColor : "#fff",
        borderWidth : "3",
        hoverBorderColor : "#000",
        backgroundColor: [
          "#f38b4a",
          "#56d798",
          "#ff8397",
          "#6970d5" 
        ],
        hoverBackgroundColor: [
          "#f38b4a",
          "#56d798",
          "#ff8397",
          "#6970d5"
        ]
      }]
  },
  options: {
    scales: {
      yAxes: [{
        ticks:{
          min : 0,
          stepSize : 1,
          fontColor : "#000",
          fontSize : 14
        },
        gridLines:{
          color: "#000",
          lineWidth:2,
          zeroLineColor :"#000",
          zeroLineWidth : 2
        },
        stacked: true
      }],
      xAxes: [{
        ticks:{
          fontColor : "#000",
          fontSize : 14
        },
        gridLines:{
          color: "#fff",
          lineWidth:2
        }
      }]
    },
    responsive:false
  },
  options: {
                chartArea: {
                    backgroundColor: 'rgba(251, 85, 85, 0.4)'
                }
            }
};

        var ctx = document.getElementById("barChart").getContext("2d");
        new Chart(ctx, config);
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