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Flashing / Blinking Charts using CanvasJS

Vishwas R
#Engineer || #SoftwareDeveloper || #Techie || #Cricketer || #Traveler || #Blogger
・1 min read

While developing a dashboard, developers get requirement to blink a column / bar within the chart to highlight it or to make it different from all other columns / bars or sometimes it could be to blink data-labels to show information like Sell / Buy incase of StockCharts. This can be easily achieved in CanvasJS Charts / StockCharts. Below is a simple tutorial for the same with sample code & live examples.

CanvasJS StockChart with Blinking / Flashing Annotatin

Prerequisites

Creating Column Chart

var chart = new CanvasJS.Chart("chartContainer", {
  title:{
    text: "Basic Column Chart"
  },
  data: [{              
    dataPoints: [
      { label: "apple",  y: 10 },
      { label: "orange", y: 15 },
      { label: "banana", y: 25 },
      { label: "mango",  y: 30 },
      { label: "grape",  y: 28 }
    ]
  }]
});

chart.render();

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Adding Blinking Effect to Column

var chart = new CanvasJS.Chart("chartContainer", {
  title:{
    text: "Blinking Column Chart"
  },
  data: [{              
    dataPoints: [
      { label: "apple",  y: 10 },
      { label: "orange", y: 15 },
      { label: "banana", y: 25, color: "#FFAA02", blinkColors: ["#FFAA02", "#6AFF05"] },
      { label: "mango",  y: 30 },
      { label: "grape",  y: 28 }
    ]
  }]
});

blinkColumns(chart);
chart.render();

function blinkColumns(chart) {
  var k = 0;
  var interval = setInterval(function() {

    for(var i = 0; i < chart.options.data.length; i++) {
      for(var j = 0; j < chart.options.data[i].dataPoints.length; j++) {
        dataPoint = chart.options.data[i].dataPoints[j];
        if(dataPoint.blinkColors) {
          dataPoint.color = dataPoint.blinkColors[k++ % dataPoint.blinkColors.length];
        }
      }
    }   
    chart.render();
  }, 500);
}
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Below is an example of StockChart with blinking indexlabels / data-labels.

Checkout CanvasJS Gallery for more examples with downloadable samples.

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