[Chartjs]-Ng2-chart.js tooltip always showing

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You can pass an options object into the canvas directive.

In your html:

<div style="display: block;">
    <canvas baseChart width="2" height="1"
            [datasets]="chartData"
            [labels]="chartLabels"
            [options]="chartOptions"
            [colors]="chartColors"
            [legend]=true
            chartType=line></canvas>
</div>

In your typescript, create the chartOptions:

private chartOptions = { responsive: true, tooltips: { mode: 'index', intersect: false } };

Set the intersect: false option to have the tooltip always displayed on hover, like you wanted.

More on ChartJS tooltips

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