How to disable a submit button after submission in PHP?

Question

I browsed through the other questions on this issue but couldn\'t find a satisfactory answer. I have a quiz website where the user selects an option from four options and then c

Answer 1

Just try with below code. I hope it will help you...

    $('#contact-form').submit(function () {
        if ($(this).valid()) {
            $('.submit').attr("disabled", true);
        }
    });