Chartjs-How to change x-axis line style in chartjs?

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1👍

zeroLineWidth apparently only works if the yAxis starts at zero. This can be guaranteed by adding ticks.beginAtZero to your yAxis. 

ticks: {
  beginAtZero: true
}

new Chart(document.getElementById('myChart'), {
  type: 'line',
  data: {
    labels: ['A', 'B', 'C', 'D'],
    datasets: [{
      label: 'OK',
      data: [1, 2, 1, 2],
      fill: false,
      borderColor: 'blue'
    }]
  },
  options: {
    responsive: true,
    legend: {
      display: false
    },
    scales: {
      xAxes: [{
        gridLines: {
          display: false
        }
      }],
      yAxes: [{
        gridLines: {
          drawBorder: false,
          drawTicks: false,
          borderDash: [4, 4],
          color: "#eee",
          zeroLineWidth: 0
        },
        ticks: {
          beginAtZero: true
        }
      }]
    }
  }
});
<script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/2.9.3/Chart.min.js"></script>
<canvas id="myChart" height="90"></canvas>

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