java - 在java中获取选项元素的值

Question

我对 javascript 非常陌生，我已经为此工作了几个小时......我想我应该问一些专家。

我正在此 JavaScript 函数中设置选项元素的值:

function receiveAnswer(response) {
  var aSeats = document.getElementById("aSeats");
    aSeats.options.length = 0;// clear it out

   for (var i = 0; i < response.aSeats.length; i++) { // add the items back in
    var option = aSeats.appendChild(document.createElement("option"));
    option.value = i;
    option.appendChild(document.createTextNode(response.aSeats[i]));
  }
}

这是 html:

<% Venue v = (Venue)session.getAttribute("currentVenue"); %>
<% List<Conceptual_Package> cpList = Conceptual_PackageDAO.getInstance().getByVenue(v.getId()); %>

What Packages do you want to see?

 <form method="post" action="ttp.actions.Sale3PackAction.action">
 <select name="packid" id="packid">
     <% for (Conceptual_Package cp: cpList) { %>
    <option value="<%=cp.getId()%>"><%=cp.getName1()%></option>
    <% } %>


 </select>

    <input type="button" value="  next  " onclick="getSeats();"/>

    </form>


<!--new-->


Available Seats:

<div>

</div>

 <select name="aSeats" size="10" id="aSeats">
 </select>


    <input type="button" value="  add  " onclick="addToCart();"/>

    <div>

    </div>


Selected Seats:
 <form method="post" action="ttp.actions.sale4Action.action">
     <select name="Seat2" size="10" id="seat2">

     </select>

<input type="button" value="  remove  " onclick="removeFromCart();"/>

    </form>

<div>

</div>

 <form method="post" action="ttp.actions.finalizeSaleAction.action">

    <input type="submit" value="  Buy Tickets  "/>

    </form>

我想获取这个java类中那些选项元素的值:

public class finalizeSaleAction implements Action {
    public String process(HttpServletRequest request, HttpServletResponse response) throws Exception {

        HttpSession session = request.getSession();
        Venue v = (Venue) session.getAttribute("currentvenue");
        Sale s = SaleDAO.getInstance().create(GUID.generate());
        if(session.getAttribute("type") == "packages"){


            Conceptual_Package cp = (Conceptual_Package) request.getAttribute("cp");

            List<Physical_Package> ppList = (List<Physical_Package>) request.getAttribute("seat2");

            Physical_Pkg_Set pps = Physical_Pkg_SetDAO.getInstance().create(GUID.generate());

            pps.setType("Phys Package Set");
            pps.setDiscount(cp.getDiscount());
            pps.setVenueID(v.getId());

            double price = 0;

            Object seatList = request.getAttribute("seat2");

Answer 1

而不是

request.getAttribute("seat2");

使用

request.getParameter("seat2");

并从浏览器获取所选选项元素的所有值。

将以下选择标签更改为

 <select name="aSeats" size="10" id="aSeats"  multiple="multiple"/>

这样，您可以在浏览器中选择多个选项值。并且在服务器端，您可以检索所选选项的值，如下所示

String[] selectedSeats = request.getParameterValues("seat2");

要获取选择选项的所有值，请使用 jQuery 执行以下操作

 <input type ="hidden" name ="selectedSeats" id ="selectedSeats" value=""/>

 var optionValues= new Array();
 $("#aSeats").each(function()
 {
     optionValues.push($(this).val()); 
 });

 var selectedValues = optionValues.get().join(',');
 $('#selectedSeats').val(selectedValues);

从您使用的服务器端。

String seats= request.getParameter("selectedSeats");
String selectedSeats[] = seats.split(",");