valid always return true!

[rejoan121615]

I just copy the code and replace the form id with my form id. But the valid variable always returns true. It's doesn't return any error or anything.

// pristine validation
window.onload = function () {
var form = document.getElementById("sign-in");

// create the pristine instance
var pristine = new Pristine(form);

form.addEventListener("submit", function (e) {
    e.preventDefault();

    // check if the form is valid
    var valid = pristine.validate(); // returns true or false
    console.log(valid);
    console.log(pristine);
});

};