JSFiddle - React, Tailwind, and code Playground

by sazakharov

HTML

<script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/1.0.2/Chart.min.js"></script>
<canvas id="canvas" width="600" height="300"></canvas>

JavaScript

Chart.types.Line.extend({
  name: "LineAlt",
  initialize: function (data) {
    var strokeColors = [];
    data.datasets.forEach(function (dataset, i) {
      if (dataset.dottedFromLabel) {
        strokeColors.push(dataset.strokeColor);
        dataset.strokeColor = "rgba(0,0,0,0)"
      }
    })

    Chart.types.Line.prototype.initialize.apply(this, arguments);

    var self = this;
    data.datasets.forEach(function (dataset, i) {
      if (dataset.dottedFromLabel) {
        self.datasets[i].dottedFromIndex = data.labels.indexOf(dataset.dottedFromLabel) + 1;
        self.datasets[i]._saved = {
          strokeColor: strokeColors.shift()
        }
      }
    })
  },
  draw: function () {
    Chart.types.Line.prototype.draw.apply(this, arguments);

    // from Chart.js library code
    var hasValue = function (item) {
      return item.value !== null;
    },
        nextPoint = function (point, collection, index) {
          return Chart.helpers.findNextWhere(collection, hasValue, index) || point;
        },
        previousPoint = function (point, collection, index) {
          return Chart.helpers.findPreviousWhere(collection, hasValue, index) || point;
        };

    var ctx = this.chart.ctx;
    var self = this;
    ctx.save();
    this.datasets.forEach(function (dataset) {
      if (dataset.dottedFromIndex) {
        ctx.lineWidth = self.options.datasetStrokeWidth;
        ctx.strokeStyle = dataset._saved.strokeColor;

        // adapted from Chart.js library code
        var pointsWithValues = Chart.helpers.where(dataset.points, hasValue);
        Chart.helpers.each(pointsWithValues, function (point, index) {
          if (index >= dataset.dottedFromIndex)
            ctx.setLineDash([3, 3]);
          else
            ctx.setLineDash([]);

          if (index === 0) {
            ctx.moveTo(point.x, point.y);
          }
          else {
            if (self.options.bezierCurve) {
              var previous = previousPoint(point, pointsWithValues,...