java - 如何从复选框 onchange 事件获取 id

Question

这是我的 servlet 页面。我正在尝试从复选框 onchange 事件获取品牌 id。但它不会起作用。谁能帮帮我吗？

public class servlet extends HttpServlet {

    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        resp.setContentType("text/html;charset=UTF-8");

        try {
            Session s1 = Connection.NewHibernateUtil.getSessionFactory().openSession();
            Criteria c = s1.createCriteria(Brand.class);
            List<Brand> list = c.list();
            for (Brand brand : list) {
                PrintWriter out = resp.getWriter();
                out.println("<input type=\"checkbox\"> <onchange=\"self.location.href=index.jsp?b=" + brand.getIdbrand() + ">" + brand.getName() + "<br>");
            }

        } catch (Exception e) {
            e.printStackTrace();
        }

    }

}

Answer 1

仔细看看您的<input>标签。

"<input type=\"checkbox\"> <onchange=\"self.location.href=index.jsp?b=" + 
brand.getIdbrand() + ">"

您不小心关闭了中间的输入标签。 onchange是 <input> 的属性，所以它应该在 <input> 中标签。并且缺少双引号 "在最后。像这样改变它，

"<input type='checkbox' onchange='self.location.href=\"index.jsp?b=" + 
brand.getIdbrand() + "\"'>"