How to make th: value of select have multiple values

<select id=“select_mult”>
	<option th:each="user : ${user_list}" th:value="${user.id} + ',' + ${user.name}">[[${user.name}]]
</select>

<span id="user_name"></span>

$(function(){
	$('#select_mult').change(function(){
		var str = $('#select_mult option:selected').val().split(',');
		var id = str[0];
		var name = str[1];
		
		$('#user_name').val(id);
        $('#user_name').text(name);
	});
});

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