Onclick Event Runs Twice

I can't seem to work out why my onclick() event fires twice when the user clicks on a star. If the user clicks on the first star in the first set, it should output 1 and 0.5 to th

Solution 1:

Problem with you code is that clicking on label in a fieldset emits click event on the input. So you really have two clicks - first on label, second - on related input radio.

So, what you need to do is to track change event for radio instead tracking clicks on fieldset.

Update: And as Temani Afif mentioned in comments, as you have non-unique ids for inputs, clicking on radio in second fieldset still gets value of input[type='hidden'] in first fieldset. So, you need to replace you labels ids too.

More: a better practice for labels is wraping input in it, so you have markup something like:

<label class="half" title="Good">
    <input type="radio" name="rating" value="4.5" />
</label>

In this case you don't need id and for as label works with element which is inside it.

$(document).on('change', 'input[type="radio"]', function (e) {
    console.log(
        $(this).val(), 
        $(this).parent().find("input[type='hidden']").val()
    );
});

fieldset,
label {
  margin: 0;
  padding: 0;
  margin-bottom: 20px;
}

.rating {
  border: none;
  float: left;
}

.rating>input {
  display: none;
}

.rating>label:before {
  margin: 5px;
  font-size: 1.25em;
  font-family: FontAwesome;
  display: inline-block;
  content: "\f005";
}

.rating>.half:before {
  content: "\f089";
  position: absolute;
}

.rating>label {
  color: #ddd;
  float: right;
}

.rating>input:checked~label,

/* show gold star when clicked */

.rating:not(:checked)>label:hover,

/* hover current star */

.rating:not(:checked)>label:hover~label {
  color: #FFD700;
}


/* hover previous stars in list */

.rating>input:checked+label:hover,

/* hover current star when changing rating */

.rating>input:checked~label:hover,
.rating>label:hover~input:checked~label,

/* lighten current selection */

.rating>input:checked~label:hover~label {
  color: #FFED85;
}

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<link href="https://maxcdn.bootstrapcdn.com/font-awesome/4.2.0/css/font-awesome.min.css" rel="stylesheet"/>

<fieldset class="rating">
<input type="hidden" value="1">
  <input type="radio" id="5star" name="rating" value="5" />
  <label class="full" for="5star" title="Excellent"></label>

  <input type="radio" id="4halfstar" name="rating" value="4.5" />
  <label class="half" for="4halfstar" title="Good"></label>

  <input type="radio" id="4star" name="rating" value="4" />
  <label class="full" for="4star" title="Pretty good"></label>

  <input type="radio" id="3halfstar" name="rating" value="3.5" />
  <label class="half" for="3halfstar" title="Nice"></label>

  <input type="radio" id="3star" name="rating" value="3" />
  <label class="full" for="3star" title="Ok"></label>

  <input type="radio" id="2halfstar" name="rating" value="2.5" />
  <label class="half" for="2halfstar" title="Kinda bad"></label>

  <input type="radio" id="2star" name="rating" value="2" />
  <label class="full" for="2star" title="Bad"></label>

  <input type="radio" id="1halfstar" name="rating" value="1.5" />
  <label class="half" for="1halfstar" title="Meh"></label>

  <input type="radio" id="1star" name="rating" value="1" />
  <label class="full" for="1star" title="Umm"></label>

  <input type="radio" id="halfstar" name="rating" value="0.5" />
  <label class="half" for="halfstar" title="Worst"></label>

</fieldset>

<br><br>

<fieldset class="rating">
<input type="hidden" value="2">
  <input type="radio" id="second-5star" name="rating" value="5" />
  <label class="full" for="second-5star" title="Excellent"></label>

  <input type="radio" id="second-4halfstar" name="rating" value="4.5" />
  <label class="half" for="second-4halfstar" title="Good"></label>

  <input type="radio" id="second-4star" name="rating" value="4" />
  <label class="full" for="second-4star" title="Pretty good"></label>

  <input type="radio" id="second-3halfstar" name="rating" value="3.5" />
  <label class="half" for="second-3halfstar" title="Nice"></label>

  <input type="radio" id="second-3star" name="rating" value="3" />
  <label class="full" for="second-3star" title="Ok"></label>

  <input type="radio" id="second-2halfstar" name="rating" value="2.5" />
  <label class="half" for="second-2halfstar" title="Kinda bad"></label>

  <input type="radio" id="second-2star" name="rating" value="2" />
  <label class="full" for="second-2star" title="Bad"></label>

  <input type="radio" id="second-1halfstar" name="rating" value="1.5" />
  <label class="half" for="second-1halfstar" title="Meh"></label>

  <input type="radio" id="second-1star" name="rating" value="1" />
  <label class="full" for="second-1star" title="Umm"></label>

  <input type="radio" id="second-halfstar" name="rating" value="0.5" />
  <label class="half" for="second-halfstar" title="Worst"></label>

</fieldset>