dojo – 如何从dijit.form.Select中获取选项文本？

<c:set var="qualId" value="${previous.qualification.id}" />
<select id="qualification" name="qualification" dojoType="dijit.form.Select" onchange="checkForPHD()">
    <option value="-1" label="                      "> </option>
    <c:forEach items="${requestScope.qualifications}" var="qualItem">
        <c:choose>
        <c:when test="${qualId eq qualItem.id}">
            <option value="${qualItem.id}" selected = "selected">${qualItem.name}</option>
        </c:when>
        <c:otherwise>
            <option value="${qualItem.id}">${qualItem.name}</option>
        </c:otherwise>
        </c:choose>
    </c:forEach>
</select>

然后我试图用一些javascript来设置一些文本到从选择框中选择的选项的TEXT;

function checkForPHD() {    
        dojo.byId('clazzPHDMessage').innerHTML = dojo.byId('qualification')
           .attr('displayedValue');
    }

我读过.attr(‘displayedValue’)假设从dijit.form.Select中的选定选项中获取文本,但它似乎没有做太多？ .attr(‘value’)得到了那些值,但是我需要TEXT？

dijit.byId('qualification').attr('displayedValue')