[Solved]-Chartjs doesn't update dataset label on tooltips-Chart.js

For tooltips try something like this:

myLineChart.data.labels = labels; //change all labels
myLineChart.update();

or

myLineChart.data.labels[0] = 'new label';
myLineChart.update();

For VB.NET, make sure it's all built as a string.

var radarOptions = {
    multiTooltipTemplate: "<" + "%= datasetLabel %> - " + "<" + "%= value %>"
}

Angular 2 I have initilized chartlabel on every click of graph display. this.lineChartLabels=[]; I have put condition in div ,untill data comes to chartlabels ,do not render the graph

<div *ngIf="lineChartLabels!=0"> It works for me

Instead of try like that, you just put your code within chart options. It will work fine.

example:

var radarOptions = {
  multiTooltipTemplate: "<%= datasetLabel %> - <%= value %>"
}
var ctx = document.getElementById("radarChart").getContext("2d");//radarChart is the canvasid for radar chart//
var myNewChart = new Chart(ctx).Radar(radarData, radarOptions);