Chartjs-How I can add the predict data and the actual data in the same graph with ChartJS?

you can use plugin and chagne the chartLineStlyle from where you want to dashed.

https://www.chartjs.org/docs/latest/developers/plugins.html

Use plugin available hook

var chart = new Chart(ctx, {
plugins: [{
    beforeInit: function(chart, options) {
        //..
    }
}] });