제이쿼리 input radio가 체크되면 다음버튼 활성화 되게 질문입니다 채택완료

<div class="survey_element2">

<div class="reservation_wrap2">

<div class="reservation_time">

<p><img src="<?php echo G5_IMG_URL;?>/time_icon.svg">시간 선택</p>

<img src="<?php echo G5_IMG_URL;?>/arrow_down.svg">

</div>

<div class="black_line"></div>

</div>

<div class="reservation_wrap2_down">

<label for="time">

<input type="radio" name="time" id="time" hidden value="">

<p class="time_text">9:00 ~</p>

</label>

<label for="time">

<input type="radio" name="time" id="time" hidden value="">

<p class="time_text">9:30 ~</p>

</label>

<label for="time">

<input type="radio" name="time" id="time" hidden value="">

<p class="time_text">10:00 ~</p>

</label>

<label for="time">

<input type="radio" name="time" id="time" hidden value="time"/>

<p class="time_text">11:00 ~</p>

</label>

<div class="time_select">

<p class="select_ok"><span></span>선택</p>

<p class="select_no"><span></span>불가</p>

</div>

<div class="grey_line"></div>

</div>

</div>

---> 스크립트

function next_btn_validation(index){

if(index == "1") {

var count = 0;

$('select[name=questions] :selected').each(function(){

if($(this).val() > 0){

count++;

}

if($(this).val() > 0){

$('#next_btn').prop('disabled', false);

}else {

$('#next_btn').prop('disabled', true);

}

//비활성화일때 다음으로 넘어가기 방지

});

console.log(count);

}else if(index == "2"){

//var count = 0;

var count2 = $('input:radio[name=time]:checked').val();

$('input:radio[name=time]').on('change', function(){

if($(this).val == ''){

}

})

console.log(count);

}else if(index == "3"){

}

var total_question_count = $('.q' + index).find('.my_hidden_input').val();

if(count == total_question_count){

$('#next_btn').attr('class','next');

}else {

$('#next_btn').attr('class','btn_deactivated');

}

}

// select 할때 next_btn_validation

$('select[name=questions]').on('change', function(){

var index = $('#navigation').find('li.active').index();

next_btn_validation(index);

});

//input check 할때 next_btn_validation

$('input:radio[name=time]').on('change', function(){

var index = $('#navigation').find('li.active').index();

next_btn_validation(index);

})

input이 체크가 되면 넘어가게 하고 싶습니다... 짜다가 도저히 머리가 안돌아가 고수님들께 여쭤봅니다...