Chartjs-Execute chartjs after an ajax call with PHP

To take the value of variables you have to access the json obtained as an answer (data) and you have to convert “val1, val2, …” in the vector [val1, val2, …] with split:

var ctx = document.getElementById("myChart").getContext('2d');
        $.ajax({
            url: "server.php",
            type: "POST",
            data: {
                ...
            },
            success: function(data) {
                var datos = JSON.parse(data);
                var myChart = new Chart(ctx, {
                    type: 'line',
                    data: {
                        labels: datos.cot_labels.split(','), ///in this way you access the data of the returned json
                        datasets: [{
                            data: datos.cot_values.split(','),///in this way you access the data of the returned json
                            label: "A",
                            borderColor: "#3e95cd",
                            fill: false
                        }, {
                            data: datos.cot_values2.split(','),
                            label: "B",
                            borderColor: "#8e5ea2",
                            fill: false
                        }]
                    },
                    options: {
                        title: {
                            display: true,
                            text: datos.name
                        },
                        animation: {
                            duration: 0, // general animation time
                        },
                        hover: {
                            animationDuration: 0, // duration of animations when hovering an item
                        },
                        responsiveAnimationDuration: 0, // animation duration after a resize
                    }
                });
            }
        });

Result: