CODE EXAMPLE FOR JAVASCRIPT

plotly js y axis range

var layout = {
  xaxis: {
    range: ['2017-04-04', '2017-08-06'],
    type: 'date'
  },
  yaxis: {
    autorange: true,
    range: [86.8700008333, 138.870004167],
    type: 'linear'
  }
};