select2

HTML

<script src="http://cdnjs.cloudflare.com/ajax/libs/select2/3.3.1/select2.min.js"></script>
<link rel="stylesheet" href="http://cdnjs.cloudflare.com/ajax/libs/select2/3.3.1/select2.min.css">
<p>
    <select style="width:300px" id="select">
               <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...

CSS

body {
    font-family: sans-serif;
}

ul {
    padding: 0;
}

.info, .selected-info {
    color: #00f;
    font-weight: bold;
    font-size: 10px;
    float: right;
}

.info {
    position: relative;
    z-index: 1;
}

.selected-info {
    display: inline;
}

.selected-state {
    display: inline;
    float: left;
}

.info:hover, .selected-info:hover {
    text-decoration: underline;
}

JavaScript

function formatResult(state, container) {
    if (!state.id) return state.text; // optgroup
    container.append(state.text);
    $('<i class="info">link</i>')
        .appendTo(container)
        .mouseup(function(e) {
            e.stopPropagation();            
        })
        .click(function(e) {
            e.preventDefault();
            alert('Click!');
            $('#log').text('clicked');
        });
}

function formatSelection(state, container) {
    container.append($('<span class="selected-state"></span>').text(state.text));
    $('<i class="selected-info">link</i>')
        .appendTo(container)
        .mousedown(function(e) {
            e.stopPropagation();            
        })
        .click(function(e) {
            e.preventDefault();
            alert('Selection Click!');
            $('#log').text('selection clicked');
        });
}

$('#select').select2({
    formatResult: formatResult,
    formatSelection: formatSelection
});