How to get select2 to match

I'm trying to re-create the most basic "states" select2 example, but it does not match beyond the first letter - just like a normal select element. It does seem to be loading select2, for example, it displays the selected value to the right of the select element. However, when I try to type a state, it only seems to match the first character. I.e., If I type "t" it will match "Texas", but typing "dak" will match "Delaware" rather than "North Dakota".

I've create a gist of my complete html page. I copied the select element directly from the example page, so there's not a whole lot to it.

In a nutshell, I create a select element with the class js-example-basic-single, and then I call select2() on that element.

<script type="text/javascript">
  $(document).ready(function() {
    $(".js-example-basic-single").select2();
  });
</script>

Edit: On JS Bin

Solution

Updated jsBin.

Check the simple working snippet below based on you gist code, and make sure you're adding the CSS link include :

<link href="https://cdnjs.cloudflare.com/ajax/libs/select2/4.0.3/css/select2.min.css" rel="stylesheet"/>

Hope this helps.

$(document).ready(function() {
  $(".js-example-basic-single").select2({width:'100%'});
});

<link href="https://cdnjs.cloudflare.com/ajax/libs/select2/4.0.3/css/select2.min.css" rel="stylesheet"/>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/select2/4.0.3/js/select2.min.js"></script>

<select class="js-example-basic-single js-states form-control">
  <optgroup label="Alaskan/Hawaiian Time Zone">
    <option value="AK">Alaska</option>
    <option value="HI">Hawaii</option>
  </optgroup>
  <optgroup label="Pacific Time Zone">
    <option value="CA">California</option>
    <option value="NV">Nevada</option>
    <option value="OR">Oregon</option>
    <option value="WA">Washington</option>
  </optgroup>
  <optgroup label="Mountain Time Zone">
    <option value="AZ">Arizona</option>
    <option value="CO">Colorado</option>
    <option value="ID">Idaho</option>
    <option value="MT">Montana</option>
    <option value="NE">Nebraska</option>
    <option value="NM">New Mexico</option>
    <option value="ND">North Dakota</option>
    <option value="UT">Utah</option>
    <option value="WY">Wyoming</option>
  </optgroup>
  <optgroup label="Central Time Zone">
    <option value="AL">Alabama</option>
    <option value="AR">Arkansas</option>
    <option value="IL">Illinois</option>
    <option value="IA">Iowa</option>
    <option value="KS">Kansas</option>
    <option value="KY">Kentucky</option>
    <option value="LA">Louisiana</option>
    <option value="MN">Minnesota</option>
    <option value="MS">Mississippi</option>
    <option value="MO">Missouri</option>
    <option value="OK">Oklahoma</option>
    <option value="SD">South Dakota</option>
    <option value="TX">Texas</option>
    <option value="TN">Tennessee</option>
    <option value="WI">Wisconsin</option>
  </optgroup>
  <optgroup label="Eastern Time Zone">
    <option value="CT">Connecticut</option>
    <option value="DE">Delaware</option>
    <option value="FL">Florida</option>
    <option value="GA">Georgia</option>
    <option value="IN">Indiana</option>
    <option value="ME">Maine</option>
    <option value="MD">Maryland</option>
    <option value="MA">Massachusetts</option>
    <option value="MI">Michigan</option>
    <option value="NH">New Hampshire</option>
    <option value="NJ">New Jersey</option>
    <option value="NY">New York</option>
    <option value="NC">North Carolina</option>
    <option value="OH">Ohio</option>
    <option value="PA">Pennsylvania</option>
    <option value="RI">Rhode Island</option>
    <option value="SC">South Carolina</option>
    <option value="VT">Vermont</option>
    <option value="VA">Virginia</option>
    <option value="WV">West Virginia</option>
  </optgroup>
</select>