Jquery if checkbox is checked add a class

Question

I am trying to add a class when a checkbox is checked.

My jquery:

$(\'input\').attr(\"checked\").change(function(){
$(\'div.menuitem\').addClass(\"me         


        

Answer 1

$('.vfb-checkbox input:checkbox').change(function(){
     if($(this).is(":checked")) {
        $('.vfb-checkbox label').addClass("checked");
    } else {
        $('.vfb-checkbox label').removeClass("checked");
    }
});

.vfb-checkbox{
  width:180px;
  height:130px;
 background:url('http://i304.photobucket.com/albums/nn181/Amam_Dewan/2932337756_1845773ed4_q_d_zpsea5idhnt.jpg');
}
/* checkboxes */

.vfb-checkbox label {
		  cursor: pointer;
	    display: block;
	    position: relative;
  width:100%;
  height:100%;

	}

.vfb-checkbox label:hover{
  background:rgba(0,0,0,.7) url(http://i304.photobucket.com/albums/nn181/Amam_Dewan/selected_zpsvfoaira0.png)center center no-repeat;
}

	
.vfb-checkbox input[type=checkbox] {  
    	display: none;
	}
	
.checked{
  	    background: rgba(0,0,0,.4) url('http://i304.photobucket.com/albums/nn181/Amam_Dewan/selected_zpsvfoaira0.png') center center no-repeat;  
}

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div class="vfb-checkbox">
  <label id="checkbox" for="check1">
    <input id="check1" type="checkbox" name="check" value="check1">
  </label>
</div>
<div class="vfb-checkbox">
  <label id="checkbox" for="check1">
    <input id="check1" type="checkbox" name="check" value="check1">
  </label>
</div>

I used jquery in checkbox. When I clicked on one element the other elements are effected. How can I fix this problem?