Updating Muliple Line Chart

[chess-drive]

Hi, I just proming "database monitoring Application" now.
It should be served real-time. almost...
but, Here is the problem.

`
var datasets = [];
var y_scales = {};
for (var i = 0; i < graph_cnt; i++){
var yAxisID = "y" + i;
eval("y_scales." + yAxisID + "= {min: 0, max: 1000, type: 'linear', display: true}");

	datasets.push({
		label: "",
		borderColor: NAMED_COLORS[(i + 4) % 7],
		borderWidth: 1,
		radius: 1,
		data: data,
		yAxisID: yAxisID
	});
}
const config = {
  type: 'line',
  data: {
	datasets: datasets
  },
  options: {
    responsive: false,
    interaction: {
			intersect: false
	},
    plugins: {
      legend: false
    },
    scales: y_scales
  },
};

var chart = new Chart(canvas,config);

this.addDataToChart = function(label,data_arr){
	var cnt = 0;
	chart.data.labels.push(label);
	chart.data.datasets.forEach((dataset) => {
		console.log("x:"+label+",y:"+data_arr[cnt].VALUE+",label:"+data_arr[cnt].KEY)
		dataset.label = data_arr[cnt].KEY;
		dataset.data.push({x: label,y: data_arr[cnt].VALUE});  // When I do this line.
		cnt++;
	});
}
this.removeDataFromChart = function(){
	if(chart.data.labels.length > 30){
		chart.data.labels.shift();
		chart.data.datasets.forEach((dataset) => {
			dataset.data.shift();
		});
	}
}
this.updateChart = function(){
	chart.update();
}

`

When script execute that line , I think whole datasets do the push....

so... whole datasets are have same data .

you should check this thing..

[chess-drive]

problem solved.

sorry , my bad