如何使用 javascript 更改选择列表 jsp 中的选项

How to change options in select list jsp using javascript?

本文关键字：jsp 选项 列表 选择 何使用 javascript      更新时间：2023-09-26

我有这个jsp页面，如果你点击一个单选按钮，一个小节应该变得不可见，选择列表中的选项应该改变。 

<center>
  <span class="ReportSubsectionTitle">Report Type</span>
                                    <br />
 <html:radio  styleId="detail" property="reportOutputStyleID" onclick="doSummary();" value="1" />Pending Funding
                                    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
 <html:radio  styleId="summary" property="reportOutputStyleID" onclick="doDetail();" value="2" />Previously Funded
 </center>
 <script>
 function doDetail(){   
    document.getElementById("narrowByDateRangeTop").checked = false;        
    document.getElementById("narrowByDateRangeBottom").checked = false;
    document.getElementById("narrowByDateRangeTop").disabled = true;    
    document.getElementById("narrowByDateRangeBottom").disabled = true;
    document.getElementById("dateRangeTypeID").disabled = true;
    document.getElementById("dateRangeLabel").disabled = true;
    document.getElementById("startDateStr").disabled = true;
    document.getElementById("startDateLabel").disabled = true;
    document.getElementById("startDateCalendarTrigger").disabled = true;
    document.getElementById("endDateStr").disabled = true;
    document.getElementById("endDateLabel").disabled = true;
    document.getElementById("endDateCalendarTrigger").disabled = true;
    document.getElementById("startDateTime").disabled = true;
    document.getElementById("endDateTime").disabled = true;
    document.getElementById("narrowByDateRangeTop").style.visibility = "hidden";    
    document.getElementById("narrowByDateRangeBottom").style.visibility = "hidden";
    document.getElementById("dateRangeTypeID").style.visibility = "hidden";
    document.getElementById("dateRangeLabel").style.visibility = "hidden";
    document.getElementById("startDateStr").style.visibility = "hidden";
    document.getElementById("startDateLabel").style.visibility = "hidden";
    document.getElementById("startDateCalendarTrigger").style.visibility = "hidden";
    document.getElementById("endDateStr").style.visibility = "hidden";
    document.getElementById("endDateLabel").style.visibility = "hidden";
    document.getElementById("endDateCalendarTrigger").style.visibility = "hidden";
    document.getElementById("startDateTime").style.visibility = "hidden";
    document.getElementById("endDateTime").style.visibility = "hidden";
    document.getElementById("DateSelection").style.visibility = "hidden";
 }
 function doSummary(){  
    document.getElementById("narrowByDateRangeTop").checked = true;     
    document.getElementById("narrowByDateRangeBottom").checked = false;
    document.getElementById("narrowByDateRangeTop").disabled = false;   
    document.getElementById("narrowByDateRangeBottom").disabled = false;
    document.getElementById("dateRangeTypeID").disabled = false;
    document.getElementById("dateRangeLabel").disabled = false;
    document.getElementById("startDateStr").disabled = false;
    document.getElementById("startDateLabel").disabled = false;
    document.getElementById("startDateCalendarTrigger").disabled = false;
    document.getElementById("endDateStr").disabled = false;
    document.getElementById("endDateLabel").disabled = false;
    document.getElementById("endDateCalendarTrigger").disabled = false;
    document.getElementById("startDateTime").disabled = false;
    document.getElementById("endDateTime").disabled = false;
    document.getElementById("narrowByDateRangeTop").style.visibility = "visible";   
    document.getElementById("narrowByDateRangeBottom").style.visibility = "visible";
    document.getElementById("dateRangeTypeID").style.visibility = "visible";
    document.getElementById("dateRangeLabel").style.visibility = "visible";
    document.getElementById("startDateStr").style.visibility = "visible";
    document.getElementById("startDateLabel").style.visibility = "visible";
    document.getElementById("startDateCalendarTrigger").style.visibility = "visible";
    document.getElementById("endDateStr").style.visibility = "visible";
    document.getElementById("endDateLabel").style.visibility = "visible";
    document.getElementById("endDateCalendarTrigger").style.visibility = "visible";
    document.getElementById("startDateTime").style.visibility = "visible";
    document.getElementById("endDateTime").style.visibility = "visible";
    document.getElementById("DateSelection").style.visibility = "visible";
 }
 </script>

然后，我有这个标记为"日期选择"的小节，我想让它不可见：

 <tr>
    <td align="center" style="padding-bottom: 5px;">
        <span id = "DateSelection" class="ReportSubsectionTitle">Date Selection</span>
    </td>
    <td align="center" style="padding-bottom: 5px;">
        <span class="ReportSubsectionTitle">Save Generated Report?</span>
    </td>
</tr>
<tr>
    <td valign="top" nowrap="nowrap">
        <%@ include file="dateSelectionSection1.jsp" %>
    </td>
    <td valign="top" nowrap="nowrap" style="padding-left: 10px;">
        <%@ include file="savedReportNameField.jsp" %>
    </td>
</tr>

我有一个选择列表 

  <span style="padding-left: 5px;">
                                    Date Type:
                                    <html:select property="dateTypeID">
                                        <html:options collection="dateTypes" property="id" labelProperty="name"/>
                                    </html:select>
                                </span>

我尝试将 id 添加到选择中，但它收到一个错误，指出找不到标签。我想更改下拉菜单下的选择并锁定选择。

我尝试了document.getElementById（"dateTypeID"）.options[0].selected = 1。但是，在那之后什么都没有改变。

我是 JSP 的新手，不太确定如何处理这个问题。

假设这是您的选择语句：

<select name="master" size="1">
  <option value="newsvalue">News</option>
  <option value="webmastervalue">Webmaster</option>
  <option value="techvalue">Tech</option>
</select>

在用户勾选单选按钮后调用的 javascript 函数中，您首先从 selectList 中删除所有选项，如下所示：

document.myform.master.options.length=0;

然后，您重新填充选择列表，执行以下操作：

document.myform.master.options[0]=new Option("Sports", "sportsvalue", true, false);  
document.myform.master.options[1]=new Option("Music", "musicvalue", false, false);
document.myform.master.options[2]=new Option("Movies", "moviesvalue", false, false);

"new Option（）" 函数的数据类型为：

new Option(text, value, defaultSelected, selected);

因此，在 JSP 中处理这与在 HTML 页面中的处理方式无论如何都不同。希望你觉得这个有用：-）

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