Chartjs-Chartjs: set default min for the line chart

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var data = {
  labels: ["January", "February", "March", "April", "May", "June", "July"],
  datasets: [{
    label: "My First dataset",
    backgroundColor: "rgba(255,99,132,0.2)",
    borderColor: "rgba(255,99,132,1)",
    borderWidth: 2,
    hoverBackgroundColor: "rgba(255,99,132,0.4)",
    hoverBorderColor: "rgba(255,99,132,1)",
    data: [65, 59, 20, 81, 56, 55, 40],
  }]
};
var option = {
  legend: false,
  title: {
    display: true,
  }
};

var myLineChart = Chart.Line('myChart', {
  data: data,
  options: option
});

$('#action').off().on('click', function() {
        myLineChart.options.scales.yAxes[0].ticks.min = -50;
        myLineChart.update();

        $("#action2").show();
        $("#action").hide();
    })
$('#action2').off().on('click', function() {
    myLineChart.options.scales.yAxes[0].ticks.min = 0;
    myLineChart.update();

    $("#action").show();
    $("#action2").hide();
})
<script src="https://code.jquery.com/jquery-2.2.4.min.js"></script>

<script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/2.7.1/Chart.min.js"></script>


<canvas id="myChart" width="400" height="200"></canvas>
<button id="action" style="display: block;">action</button>
<button id="action2" style="display: none;">action</button>

You can split the task by adding another button.

Please Add one more button on HTML with same name but display none.

<button id="action" style="display: block;">action</button>
<button id="action2" style="display: none;">action</button>

Add one More function 

$('#action').off().on('click', function() {
        myLineChart.options.scales.yAxes[0].ticks.min = -50;
        myLineChart.update();

        $("#action2").show();
        $("#action").hide();
    })
$('#action2').off().on('click', function() {
    myLineChart.options.scales.yAxes[0].ticks.min = 0;
    myLineChart.update();

    $("#action").show();
    $("#action2").hide();
})

OnClick you can hide / show (toggle)

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