Random Number Chart

I want to put my array of random number into chart. And I only got this. Maybe someone can help me. And here is the flow

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Screenshot from 2020-10-27 13-43-19

The problem is in the data array.

each x & y should be an array element:

See image, correct vs incorrect

Modify your code to push the element in the array in the loop:

var chartdata = context.get("chartdata") || []
var i;

for (i = 0; i < 9; i++) {
  x = parseInt(Math.random() *10);
  y = parseInt(Math.random() *12);
  chartdata.push({"x":x, "y":y});
}

msg.topic = "Random Number";
msg.payload = [{
"series": ["A"],
"data": [chartdata],
"labels": [""]
}]
return msg;

Would recommend something sensible for the x-axis.

I want to update it per sec. i mean in one second the chart will show the number in sequence.
1st sec x=2, y=3
2nd sec x=7, y=4

and it will show to the chart sequencely. thx