uccser/cs-field-guide

$(document).ready(function(){
    $("#interactive-payment-interface-input").bind('input', updatePaymentInteractive);
});

function updatePaymentInteractive() {
    var inputText = document.getElementById('interactive-payment-interface-input').value;
    var $paymentInteractiveMessage = $("#interactive-payment-interface-message");

    if (inputText.match(/^(\d+(\.\d{0,2})?)$/) != null && inputText.substring(0,1) != "0") {
        $paymentInteractiveMessage.html(gettext('Valid amount.'));
        $paymentInteractiveMessage.addClass('success');
        $paymentInteractiveMessage.removeClass('error');
    } else {
        $paymentInteractiveMessage.html(gettext('Invalid amount. Decimals are allowed up to two places.'));
        $paymentInteractiveMessage.addClass('error');
        $paymentInteractiveMessage.removeClass('success');
    }
}