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Here you have already passed the dataPoints value and hence the chart will be rendered with all the dataPoints.

To create a dynamic chart, you will have to create and assign dataPoints to a pre-defined variable (Eg: dps). After which you will have to create a function which adds the next dataPoint and call chart.render(). Then you can call the function at regular intervals which adds the dataPoint and renders the chart.
Please take a look at the code snippet below,

var xVal = dps.length + 1;
var yVal = 100;	
var updateInterval = 1000;
var updateChart = function () {
		yVal = yVal +  Math.round(5 + Math.random() *(-5-5));
		dps.push({x: xVal,y: yVal,});
setInterval(function(){updateChart()}, updateInterval); 

Please take a look at this documentation page link for a step-by-step tutorial to create a dynamic chart that updates dataPoints at regular intervals.

dynamic line chart