JAVASCRIPT

simple if condition for form validation

const signup=()=>{
    let name=document.querySelector("#u_name").value;
    let email=document.querySelector("#email_id").value;
    let password=document.querySelector("#pwd").value;
    let confirmPassword=document.querySelector("#confirm_pwd").value;
    let i=0;
    if((name==""||email=="")||(password==""||confirmPassword==""))
    {
        document.querySelector("#empty-field").innerHTML="*Fill all required fields";
        i++;
    }
    else
    {
    if(name.length<3)
    {
        document.querySelector("#u_name").style.borderColor="red";
        document.querySelector("#user-errmsg").innerHTML="*Enter valid user name";
        i++;
    }
    else
    {
        document.querySelector("#u_name").style.borderColor="#ced4da";
        document.querySelector("#user-errmsg").innerHTML="";
        i;
    }
    if(email.length<6)
    {
        document.querySelector("#email_id").style.borderColor="red";
        document.querySelector("#email-errmsg").innerHTML="*Enter valid email id";
        i++;
    }
    else
    {
        document.querySelector("#email_id").style.borderColor="#ced4da";
        document.querySelector("#email-errmsg").innerHTML="";
        i;
    }
    if(password.length<6 && confirmPassword.length<6)
    {
        document.querySelector("#pwd").style.borderColor="red";
        document.querySelector("#confirm_pwd").style.borderColor="red";
        document.querySelector("#pwd-errmsg").innerHTML="*Password must be atleast 6 digits long";
        i++;
    }
    else if(password.length<6 && confirmPassword.length>=6)
    {
        document.querySelector("#confirm_pwd").style.borderColor="red";
        document.querySelector("#pwd").style.borderColor="red";
        document.querySelector("#pwd-errmsg").innerHTML="*Password must be atleast 6 digits long";
        i++;
    }
    else if(password.length>=6 && confirmPassword.length>=6)
        {
            if(password!= confirmPassword)
            {
                document.querySelector("#pwd").style.borderColor="red";
                document.querySelector("#confirm_pwd").style.borderColor="red";
                document.querySelector("#pwd-errmsg").innerHTML="*Both fields must have the same password";
                i++;
            }
            else
            {
                document.querySelector("#pwd").style.borderColor="#ced4da";
                document.querySelector("#confirm_pwd").style.borderColor="#ced4da";
                document.querySelector("#pwd-errmsg").innerHTML="";
                i;
            }
        }
    else
    {
        document.querySelector("#pwd").style.borderColor="red";
        document.querySelector("#confirm_pwd").style.borderColor="red";
        document.querySelector("#pwd-errmsg").innerHTML="*Both fields must have the same password";
        i++;
    }
    document.querySelector("#empty-field").innerHTML="";
    }
    if(i==0)
    return true;
    else
    return false
}