无法从JSP检索多个检查值 [英] failing to retrieve multiple checked value from JSP

问题描述

我正在尝试检索多个检查值，这些值在JSP中动态显示，是从邮件服务器的收件箱文件夹中检索的，就像在yahoo或gmail中一样.但是，每当我选择多个复选框(或其中一个)时，我都无法检索它们的值，例如主题和用户名.我应该在JSP中做些什么才能动态地在另一个JSP中检索那些值?

I'm trying to retrieve mulitple checked value, which are being showed in JSP dynamically, retrieved from inbox folder of the mail server, just like in yahoo, or gmail. But whenever I select multiple checkboxes(or either one), I'm not able to retrieve their values, like subject and username. What should I have to do in JSP to retrieve those values in another JSP dynamically?

推荐答案

表单中的每个复选框应具有相同的名称，但应具有不同的值.例如

Each check-box in a form should have the same name but different value. e.g.

...
      <input
        type="checkbox"
        id="SELECT_CB_1"
        name="SELECT_CB"
        value="1"
      /> Checkbox 1
      <input
        type="checkbox"
        id="SELECT_CB_2"
        name="SELECT_CB"
        value="2"
      /> Checkbox 2
      <input
        type="checkbox"
        id="SELECT_CB_3"
        name="SELECT_CB"
        value="3"
      /> Checkbox 3
...

然后，当您发布表单时，可以使用HttpServletRequest检索名称为SELECT_CB的所有复选框的值.

Then when your form gets posted, you can use HttpServletRequest to retrieve the values of all checked boxes with the name SELECT_CB.

String[] checked_values = request.getParameterValues( "SELECT_CB" );

如果未选中任何复选框，则可能需要检查null.

You may need to check for null if no checkboxes are selected.

在前面的示例中，如果选中SELECT_CB_1和SELECT_CB_3，则checked_values将包含[ "1", "3" ]

In the previous example, if you check SELECT_CB_1 and SELECT_CB_3 then checked_values will contain [ "1", "3" ]

您可以使用这些值来检索难题的其他部分，例如主题和用户名.

You can use these values then to retrieve other pieces of your puzzle, like subject and username.

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