Disable chartJS tool tip on one dataset only - chart.js

Question

Is there a way so that one can disable the tool tips on one dataset on a Chart JS Chart and leave the tool tips present on the other dataset. Here is my current code:
var data = {
labels: [' . $labels . '],
datasets: [
{
label: "Portfolio Performance",
fillColor: "rgba(0,0,220,0.2)",
strokeColor: "rgba(0,220,220,1)",
pointColor: "rgba(0,0,0,1)",
pointStrokeColor: "#fff",
pointHighlightFill: "#fff",
pointHighlightStroke: "rgba(220,220,220,1)",
data: [' . $values . ']
},
{
label: "Portfolio Expendature",
fillColor: "rgba(0,0,220,0)",
strokeColor: "rgba(0,0,0,1)",
pointColor: "rgba(0,0,0,0)",
pointStrokeColor: "rgba(0,0,220,0)",
pointHighlightFill: "rgba(0,0,220,0)",
pointHighlightStroke: "rgba(220,220,220,0)",
data: [4450000,4450000,4450000,4450000,4450000]
}
]
};
var option = {
tooltipTemplate: "<%if (label){%><%=label%>: <%}%><%= \'£\' + FormatNumberBy3(Number(value).toFixed(2), \'.\' , \',\') %>",
maintainAspectRatio: false,
bezierCurve: false,
responsive: true,
scaleLabel: "<%= \'£\' + FormatNumberBy3(Number(value), \'.\' , \',\') %>"
};
var ctx = document.getElementById("graph").getContext("2d");
var myLineChart = new Chart(ctx).Line(data, option);

Answer 1

You can use custom tooltips to do this (basically you use an HTML element instead of using the canvas to render the tooltip alone). See https://github.com/nnnick/Chart.js/blob/v1.0.2/samples/line-customTooltips.html for an example for line charts.
In your case, you can adjust the loop at https://github.com/nnnick/Chart.js/blob/v1.0.2/samples/line-customTooltips.html#L68 to exclude / include the datasets as you see fit.

Answer 2

I make use of the custom tooltip configuration to achieve this(here it hides datasets that doesn't have "Income" label):
this.myChart = new Chart(this.ctx, {
type: 'bar',
data: {
labels: labels,
datasets: [{
label: "Income",
data: data3
},
{
label: "Tax",
data: data1,
backgroundColor: "#3EAFD5"
},
{
label: "Expenses",
data: data2,
backgroundColor: "#D24B47"
}
]
},
options: {
responsive: true,
tooltips: {
custom: function(tooltipModel) {
if (tooltipModel.body && tooltipModel.body[0].lines && tooltipModel.body[0].lines[0].indexOf("Income") == -1) {
tooltipModel.opacity = 0;
}
}
}
}
}