index.js

function validation(){
    if(document.FormFill.Username.value==""){
        document.getElementById("result").innerHTML="Enter Username";
        return false;
    }
    else if(document.FormFill.Username.value<6){
        document.getElementById("result").innerHTML="Atleast 6-char.";
        return false;
    }
    else if(document.FormFill.Email.value==""){
        document.getElementById("result").innerHTML="Enter Your Email*";
        return false;
    }
    else if(document.FormFill.Password.value==""){
        document.getElementById("result").innerHTML="Enter Your Password*";
        return false;
    }
    else if(document.FormFill.Password.value.length<6){
        document.getElementById("result").innerHTML="Password must be 6-digit";
        return false;
    }
    else if(document.FormFill.CPassword.value==""){
        document.getElementById("result").innerHTML="Enter Confirm Password";
        return false;
    }
    else if(document.FormFill.Password.value !== document.FormFill.CPassword.value){
        document.getElementById("result").innerHTML="Password didn't matched";
        return false;
    }
    else if(document.FormFill.Password.value == document.FormFill.CPassword.value){
        popup.classList.add("open-slide");
        return false;
    }
}
var popup=document.getElementById('popup');
function CloseSlide(){
    popup.classList.remove("open-slide");
}