[Solved]-How to create a column range chart in Highcharts using range and navigator functions?-Highcharts

So after a few hours of digging, I have just found out the culprit (or I really hope so). The problem is your definition of yAxis label formatter:

yAxis: {
  tickInterval: 1,
    gridLineWidth: 1,
    labels: {
    formatter: function() { // THIS IS THE PROBLEM
      if (tasks[this.value]) {
        return tasks[this.value].name;
      }
    }
  },
  startOnTick: false,
    endOnTick: false,
    title: {
    text: 'Task'
  }
},

You don't actually check if you should display the label according to task.intervals (see json.js). A simple update (Plunker) of the formatter seems to work:

  yAxis: {
    tickInterval: 1,
    gridLineWidth: 1,
    labels: {
      formatter: function () {
        console.log("scripts.js - yAxis.labels.formatter", this.value);
        if (tasks[this.value]) {

          //if (tasks[this.value].name === 'LILLY_C') {
            var _xAxis = this.chart.axes[0];
            var _task = tasks[this.value];
            var _show = false;

            // Not optimized for large collections
            for (var _i = 0; _i < _task.intervals.length; _i++) {
              var _int = _task.intervals[_i];
              if (_xAxis.min <= _int.to) {
                _show = true;
              }
            }

            console.log("scripts.js - yAxis.labels.formatter",
              tasks[this.value].name,
              _show,
              _xAxis.min,
              _xAxis.max,
              _task.intervals
            );

            if (_show) {
              return tasks[this.value].name;
            } else {
              return;
            }
          //}

          //return tasks[this.value].name;
        }
      }
    },
    startOnTick: false,
    endOnTick: false,
    title: {
      text: 'Task'
    }
  },

See Plunker for demo.

Meaning of the yAxis labels is: Show label if you see a run in the graph or if there is a run on the right of the graph. Please modify the condition

if (_xAxis.min <= _int.to) {

as you see fit.

Disclaimer: I don't use Highcharts, so this answer tries to explain the problem and not to suggest a Highcharts-way of solving the problem.

Lessons learned:

• yaxis-plugin.js is irrelevant to the problem.
• Highstock.js is an open-source library (highstock.src.js). Any debugging is much easier if you debug original source code. Minified code adds unnecessary complexity and guessing. I have downloaded the library and added some console.log() to find out what is going on.