js 如何设置 多个select下拉菜单 添加内容到 textarea ？？

文本域的值应该是上个值累加猜启拍起来，替换成下旁雹面方法穗羡即可:

function setVar(v_sel){

var oldVal = document.form.outPut.value

var selValue = v_sel.options[v_sel.selectedIndex].value

document.form.outPut.value = oldVal + selValue +'/n'

}

<select name="stu.stu_teacher" id="stu.stu_teacher"/>

<option value="<s:property value='#session.student.stu_teacher'/>" selected><s:property value='#session.student.stu_teacher'/></option>

<s:iterator value="#session.teacher" id="teacher">

<option value="<s:property value='#teacher.teacher_name'/>"><s:property value='#teacher.teacher_name'/>橘或毕</option>

</s:iterator>

</select>圆芹

我用的团悔s标签，你改成c标签试试

下拉框里的默认值为选择的：

<%String m=String.valueOf(request.getAttribute("m"))%>

<select name="excel.month" >

<option value="1" <%="1".equals(m)?"selected":"" %>>1</option>

<option value="2" <%="2".equals(m)?"selected":"" %>>2</option>

<option value="3" <%="3".equals(m)?"selected":"" %>>3</option>

<option value="4" <%="4".equals(m)?"selected":"" %>>4</option>

<option value="5" <%="5".equals(m)?"selected":"" %>>5</option>

<option value="6" <%="6".equals(m)?"selected":"" %>>6</option>

<option value="7" <%="7".equals(m)?"selected":"" %>>7</option>

<option value="8" <%="8".equals(m)?"selected":"" %>>8</option>

<option value="9" <%="9".equals(m)?"selected":"" %>>9</option>

<option value="10" <%="10".equals(m)?"selected":"" %>>10</option>

<option value="11" <%="11".equals(m)?"selected":"" %>>11</option>

<option value="12" <%="12".equals(m)?"selected":"" %>>12</option>

</select>

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