How to fill a percentage of a glyphicon [Bootstrap 3]

css, glyphicons, html, twitter-bootstrap

Solution

You could overlap 2 absolute positioned divs. Each would contain all 5 stars. Then the top div could have an overflow:hidden div in it, where you set the width equal to a percentage (based on the rating).

Here is a codepen that I put together that illustrates it: http://codepen.io/anon/pen/ogBWwX The code snippets are copied below for reference and includes a little extra than what is needed, for the purpose of the demo.

HTML:

<div class="container">
  <div class="flt_left">
    <form id="star_form">
      <label for="star_input">Stars:</label>
      <input type="text" id="star_input" />
      <button id="setStars">Set Rating</button>
    </form>
  </div>
  <div class="flt_left">
    <div id="star_box">
      <div class="star_limiter">
        <div class="longbar">
          <span class="glyphicon glyphicon-star"></span>
          <span class="glyphicon glyphicon-star"></span>
          <span class="glyphicon glyphicon-star"></span>
          <span class="glyphicon glyphicon-star"></span>
          <span class="glyphicon glyphicon-star"></span>
        </div>
      </div>
    </div>
    <div class="star_bg">
      <span class="glyphicon glyphicon-star"></span>
      <span class="glyphicon glyphicon-star"></span>
      <span class="glyphicon glyphicon-star"></span>
      <span class="glyphicon glyphicon-star"></span>
      <span class="glyphicon glyphicon-star"></span>
    </div>
  </div>
  <div style="clear:both;"></div>
  <p id="rating_data"></p>
</div>

CSS:

.container{
  padding: 15px;
  margin: 10px;
}
p{
  margin: 10px 0;
}
.flt_left{
  float: left;
  margin-right: 10px;
  position: relative;
  /*min-width: 250px;*/
}
#star_box,
.star_bg{
  color: #BBD41C;
  position: absolute;
  margin: 4px 0;
  top: 0;
  left: 0;
  display: table;
}
.glyphicon{
  display: table-cell;
  padding: 0 0 0 2px;
  font-size: 18px;
}
#star_box{
  z-index: 2;
}
.star_bg{
  color: #555;
}
#star_box .star_limiter{
  width:100%;
  overflow: hidden;
  position: relative;
}

Javascript:

function setWidth(perc){
  $('#star_box .star_limiter').css('width',perc+'%');
}
function starToPercent(amt,outof){
  if(typeof outof == 'undefined') outof = 5;
  var percent = Math.round(amt*100/outof);
  if(percent > 100) percent = 100;
  $('#rating_data').text(amt+' of '+outof+' stars, or '+percent+'%');
  setWidth(percent);
}
function setRating(){
  var input = parseFloat($('#star_input').val());
  var num_stars = $('#star_box .star_limiter .glyphicon-star').length;


  if(!isNaN(input)) starToPercent(input, num_stars);
}

$(document).ready(function(){
  var star_width = $('#star_box').width();
  var star_height = $('#star_box').height();
  $('#star_box').css('width',star_width+'px');
  $('#star_box .star_limiter').css('height',star_height+'px');
  $('#star_box .longbar').css('width',star_width+'px');
  
  $('#setStars').click(setRating);
  $('#star_form').submit(function(e){
    e.preventDefault();
    setRating();
  });
});

Notes: The overlapped stars don't look great, since you see a bit of the color of the background stars around the edges. So, it looks better if you get rid of the background stars and just use a solid color. It also is less noticeable the more you match the color.

I set the CSS of the glyphicons to display:table-cell to prevent them from wrapping and to position them closer together. More space between the stars creates less accurate results on floats.

Problem

Original source