Continuous Error Bars in JavaScript

How to add D3.js-based continuous error bars to a line, scatter, or bar chart.

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Plotly is a free and open-source graphing library for JavaScript. We recommend you read our Getting Started guide for the latest installation or upgrade instructions, then move on to our Plotly Fundamentals tutorials or dive straight in to some Basic Charts tutorials.

Filled Lines

var trace1 = {
  x: [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1], 
  y: [2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0], 
  fill: "tozerox", 
  fillcolor: "rgba(0,100,80,0.2)", 
  line: {color: "transparent"}, 
  name: "Fair", 
  showlegend: false, 
  type: "scatter"
};
var trace2 = {
  x: [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1], 
  y: [5.5, 3, 5.5, 8, 6, 3, 8, 5, 6, 5.5, 4.75, 5, 4, 7, 2, 4, 7, 4.4, 2, 4.5], 
  fill: "tozerox", 
  fillcolor: "rgba(0,176,246,0.2)", 
  line: {color: "transparent"}, 
  name: "Premium", 
  showlegend: false, 
  type: "scatter"
};
var trace3 = {
  x: [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1], 
  y: [11, 9, 7, 5, 3, 1, 3, 5, 3, 1, -1, 1, 3, 1, -0.5, 1, 3, 5, 7, 9], 
  fill: "tozerox", 
  fillcolor: "rgba(231,107,243,0.2)", 
  line: {color: "transparent"}, 
  name: "Ideal", 
  showlegend: false, 
  type: "scatter"
};
var trace4 = {
  x: [1, 2, 3, 4, 5, 6, 7, 8, 9, 10], 
  y: [1, 2, 3, 4, 5, 6, 7, 8, 9, 10], 
  line: {color: "rgb(0,100,80)"}, 
  mode: "lines", 
  name: "Fair", 
  type: "scatter"
};
var trace5 = {
  x: [1, 2, 3, 4, 5, 6, 7, 8, 9, 10], 
  y: [5, 2.5, 5, 7.5, 5, 2.5, 7.5, 4.5, 5.5, 5], 
  line: {color: "rgb(0,176,246)"}, 
  mode: "lines", 
  name: "Premium", 
  type: "scatter"
};
var trace6 = {
  x: [1, 2, 3, 4, 5, 6, 7, 8, 9, 10], 
  y: [10, 8, 6, 4, 2, 0, 2, 4, 2, 0], 
  line: {color: "rgb(231,107,243)"}, 
  mode: "lines", 
  name: "Ideal", 
  type: "scatter"
};
var data = [trace1, trace2, trace3, trace4, trace5, trace6];
var layout = {
  paper_bgcolor: "rgb(255,255,255)", 
  plot_bgcolor: "rgb(229,229,229)", 
  xaxis: {
    gridcolor: "rgb(255,255,255)", 
    range: [1, 10], 
    showgrid: true, 
    showline: false, 
    showticklabels: true, 
    tickcolor: "rgb(127,127,127)", 
    ticks: "outside", 
    zeroline: false
  }, 
  yaxis: {
    gridcolor: "rgb(255,255,255)", 
    showgrid: true, 
    showline: false, 
    showticklabels: true, 
    tickcolor: "rgb(127,127,127)", 
    ticks: "outside", 
    zeroline: false
  }
};
Plotly.newPlot('myDiv', data, layout);

Asymmetric Error Bars with a Constant Offset

function random_date(start, end, mul) 
  {
    return new Date(start.getTime() + mul * (end.getTime() - start.getTime()));
  }

function date_list(y1,m1,d1,y2,m2,d2,count)
  {
    var a =[];
    for(i=0;i<count;i++)
    {
      a.push(random_date(new Date(y1, m1, d1), new Date(y2,m2,d2),i));
    }
      return a;
  }

function random_number(num , mul) 
  {
     var value = [ ];
     for(i=0;i<=num;i++)
      {
        var rand = Math.random() * mul;
        value.push(rand);
      }
     return value;
  }

var trace1 = {
  x: date_list(2001,01,01,2001,02,01,50), 
  y: random_number(50,20), 
  line: {width: 0}, 
  marker: {color: "444"}, 
  mode: "lines", 
  name: "Lower Bound", 
  type: "scatter"
};

var trace2 = {
  x: date_list(2001,01,01,2001,02,01,50), 
  y: random_number(50,21),
  fill: "tonexty", 
  fillcolor: "rgba(68, 68, 68, 0.3)", 
  line: {color: "rgb(31, 119, 180)"}, 
  mode: "lines", 
  name: "Measurement", 
  type: "scatter"
};

var trace3 = {
  x: date_list(2001,01,01,2001,02,01,50), 
  y: random_number(50,22),
  fill: "tonexty", 
  fillcolor: "rgba(68, 68, 68, 0.3)", 
  line: {width: 0}, 
  marker: {color: "444"}, 
  mode: "lines", 
  name: "Upper Bound", 
  type: "scatter"
}

var data = [trace1, trace2, trace3];
var layout = {
  showlegend: false, 
  title: "Continuous, variable value error bars<br>Notice the hover text!", 
  yaxis: {title: "Wind speed (m/s)"}
};
Plotly.newPlot('myDiv', data, layout);