Question

<html>
<head>
    <title>View Shopping Cart</title>
    <script type="text/javascript">

        function remove(book_id)
        {
            document.getElementById('bookId').value = book_id;
            document.forms[0].submit();
        }

    </script>
</head>
<body>
    <table border="1" id="bookTable">
        <tr>
            <th>Book ID</th>
            <th>Book Name</th>
            <th>Author</th>
            <th>Quantity</th>
            <th>Remove from cart</th>
        </tr>
        <%
            try
            {
                int cus_id = Integer.parseInt(session.getAttribute("cusId").toString());
                ResultSet rs = SqlConnection.getData("select * from book b, shopping_cart s where s.book_id=b.book_id AND s.cus_id=" + cus_id);

                if (!rs.first())
                {
                    out.print("<h3>Nothing in the Cart!</h3>");
                }
                else
                {
                    rs.previous();

                    while (rs.next())
                    {
        %>
        <tr>
                        <%
                            out.print("<td>" + rs.getInt("book_id") + "</td>");
                            out.print("<td>" + rs.getString("book_name") + "</td>");
                            out.print("<td>" + rs.getString("author_name") + "</td>");
                            out.print("<td><input type='number' name='qty' id='qty'/></td>");
                            out.print("<td><input type='button' onClick='remove(" + rs.getInt("book_id") + ")' value='Remove from cart'/></td>");
                        %>
        </tr>
        <%
                    }
                }
            }
            catch (Exception e)
            {
                e.printStackTrace();
            }
        %>
    </table><br/><br/>

    <p style="color: green;">${successful}</p> <br/>
    <p style="color: red;">${error}</p> <br/>
    <a href="viewBooks.jsp"><input type="button" value="View Books"></a>
    <a href="welcome.jsp"><input type="button" value="Home"></a>

    <form action="/ShoppingCartRemoving" method="post">
        <input type="hidden" name="bookId" id="bookId"/>
    </form>

</body>
</html>

这是JSP代码。我检查并意识到这从未进入servlet。但另一个具有相同结构的JSP页面工作正常。这令人困惑。我试图从购物车中删除商品。

JavaScript函数是获取bookId并将其放在表单中隐藏的输入字段中，然后提交表单。这个确切的代码在另一个JSP页面中运行良好。

Answer 1

我发现了问题。这是浏览器。我改变浏览器后，它工作正常。代码很好而且正确。

我无法通过servlet删除数据库中的一行。我的IDE是IntelliJ

1 个答案: