JQuery : conditional field depending on another field

index.html

<form>
    <select id="my-select">
        <option value="1">1</option>
        <option value="2">2</option>
    </select>
    <input type="text" data-conditional="my-select" data-conditional-on="1" />
</form>

main.css

.conditional-hidden {
  display: none;
}

main.js

var jquery_conditional = {
    updateField: function (idToCheck, inputToUpdate) {
        var value = null;
        var toCheck = $('#' + idToCheck);
        if (toCheck.is("select")) {
            value = $('#' + idToCheck + ' :selected').val();
        } else if (toCheck.attr('type') == 'checkbox') {
            if (toCheck.is(':checked')) {
                value = 1;
            } else {
                value = 0;
            }
        } else {
            value = toCheck.val();
        }
        if ($.inArray(
                        value,
                        $(inputToUpdate).attr('data-conditional-on').split(',')
                ) > -1) {
            $(inputToUpdate).removeClass('conditional-hidden');
        } else {
            $(inputToUpdate).addClass('conditional-hidden');
        }
    },
    launch: function () {
        $('[data-conditional]').each(function (key, value) {
            var idToCheck = $(value).attr('data-conditional');
            this.updateField(idToCheck, value);
            $('#' + idToCheck).change(function() {
                this.updateField(idToCheck, value)
            }.bind(this));
        }.bind(this))
    }
};
jquery_conditional.launch();