Input.js

let inputs = document.querySelectorAll(".coordinate");
inputs.forEach(function (temp) {
    addEventListener("change", function () {
        const input = temp;
        let value = parseInt(input.value);
        if (!isNaN(value) && value >= 1 && value <= 8) {
            $(temp).removeClass("is-invalid");
            let startX = document.getElementById("startX");
            let startY = document.getElementById("startY");
            let endX = document.getElementById("endX");
            let endY = document.getElementById("endY");
            if (!($(startX).hasClass("is-invalid") ||
                $(startY).hasClass("is-invalid") ||
                $(endX).hasClass("is-invalid") ||
                $(endY).hasClass("is-invalid"))) {
                start.x = parseInt(startX.value);
                start.y = parseInt(startY.value);
                end.x = parseInt(endX.value);
                end.y = parseInt(endY.value);
            }
        }
        else {
            $(temp).addClass("is-invalid");
            console.log("input must be a number between 1 and 8, you wrote " + input.value);
            return;
        }
    });
});
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