将选择选项的ID设置为jstl变量 [英] Set id of select options to jstl variable

问题描述

我有一个JSP页面，该页面将一些信息从DAO加载到select元素. 像这样:

I've a JSP page that load some info from a DAO to a select element. Something like this:

<select id="dropdown" onchange="changeKa()">
  <c:forEach var="ka" items="${KaList}">
    <option value="<c:out value='${ka.area}' />" 
      <c:if test="${param.selectValue == ka.area})"> selected </c:if>  >
      <c:out value="${ka.area}" />
    </option>
  </c:forEach>
</select>

我在哪里

<option value="<c:out value='${ka.area}' />" ... 

我要设置一个这样的ID:

I want to set an id like this:

<option value="<c:out value='${ka.area}' />" id="<c:out value='${ka.id_knowledgearea}' />" ...

但是出现以下错误:

Bad value "   " for attribute "id" on element "option": An ID must not contain whitespace.

我该如何解决?

推荐答案

解决方法...

到目前为止，我通过为变量id_knowledgearea分配了option的label属性来设法解决了这个问题. 像这样:

So far I managed to overcome the problem by assigning the variable id_knowledgearea the label attribute of option. Like this:

<select id="dropdown" onchange="changeKa()">
     <c:forEach var="ka" items="${KaList}">
          <option value="<c:out value='${ka.area}'/>" label="<c:out value='${ka.id_knowledgearea}'/>"
              <c:if test="${param.selectValue == ka.area})"> selected </c:if>  >
              <c:out value="${ka.area}" />
          </option>
     </c:forEach>
</select>

无论如何，我想了解如何将变量"id_knowledgearea"分配给元素"option"的ID ...

Anyway, I'd like to understand how to assign the variable "id_knowledgearea" to the id of the element "option"...

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