Question

我正在验证定义角色名称的字段。这是一种通过邮寄发送的形式。关键是当发生错误并再次调用时：

modelAndView.setViewName ("admin/role");
return modelAndView;

它不会在<td>内重新生成th: block列表。但是当这个过程正确完成时，它会显示我的正常页面。

成功的流程：

如果发生错误：

获取方法：

@RequestMapping(value = "/admin/role", method = RequestMethod.GET)
public ModelAndView role(Model model){
    ModelAndView modelAndView = new ModelAndView();
    Authentication auth = SecurityContextHolder.getContext().getAuthentication();
    User user = userService.findUserByEmail(auth.getName());
    List<Page> pages = pageService.getAllPages();
    Role role = new Role();
    modelAndView.addObject("role", role);
    modelAndView.addObject("pages", pages);
    modelAndView.addObject("userName", user.getName());
    modelAndView.setViewName("admin/role");
    return modelAndView;
}

POST方式：

@RequestMapping(value = "/admin/role", method = RequestMethod.POST)
public ModelAndView createNewRole(@Valid Role role,BindingResult bindingResult,
                                  @RequestParam(value = "pgids" , required = false) Integer [] pgids
                                  ){
    ModelAndView modelAndView = new ModelAndView();
    Authentication auth = SecurityContextHolder.getContext().getAuthentication();
    User user = userService.findUserByEmail(auth.getName());
    modelAndView.addObject("userName", user.getName());

    Role roleExist = roleService.findByAuthority(role.getAuthority());
    if (roleExist != null){
        bindingResult
                .rejectValue("authority","error.app_role", "There is already a role registered with the name provided");
    }
    if (bindingResult.hasErrors()){
            modelAndView.setViewName("admin/role");
    }else{
        if(pgids != null) {
            for (int i = 0; i < pgids.length; i++) {
                System.out.println(pgids[i]);
            }
        }
        roleService.saveRole(role, pgids);

        List<Page> pages = pageService.getAllPages();
        modelAndView.addObject("successMessage", "Role has been created successfully");
        modelAndView.addObject("role", new Role());
        modelAndView.addObject("pages", pages);
        modelAndView.setViewName("admin/role");
    }
    return modelAndView;
}

HTML表单

<form autocomplete="off" action="#" th:action="@{/admin/role}" method="post" role="form">
<div class="row">
    <div class="col-md-12 bottommargin-sm">
        <label>Name of the Role</label>
        <label class="errormsg" th:if="${#fields.hasErrors('role.authority')}" th:errors="${role.authority}"></label>
        <input type="text" th:field="${role.authority}" class="sm-form-control"
               placeholder="Example Name"/>
    </div>
    <div class="col-md-12">
        <label>Catalogue of Pages</label>
        <table class="table table-hover">
            <thead>
            <tr>
                <th class="col-sm-2 center">Asign</th>
                <th class="col-sm-4 center">Name</th>
                <th class="col-sm-6 center">URL</th>
            </tr>
            </thead>
            <tbody>
            <th:block th:each="page : ${pages}">
                <tr>
                    <td class="col-sm-2 center">
                        <input type="checkbox" name="pgids" th:value="${page.id}"/>
                    </td>
                    <td class="col-sm-4 center" th:utext="${page.name}"></td>
                    <td class="col-sm-6 center" th:utext="${page.url}"></td>
                </tr>
            </th:block>
            </tbody>
        </table>
        <button type="submit" class="button nomargin rightmargin-sm button-reef-blue">Create
        </button>
    </div>
    <div class="col-sm-12">
        <label th:utext="${successMessage}" class="successmsg"></label>
    </div>
</div>

更新

如底部所述，一旦进入bindingResult.hasErrors（），我就错误地不添加变量页面。所以，如果＆＃39;如下：

if (bindingResult.hasErrors()){
            List<Page> pages = pageService.getAllPages();
            modelAndView.addObject("pages", pages);
            modelAndView.setViewName("admin/role");
    }

Answer 1

当您提交包含无效数据的表单时

bindingResult.hasErrors()

将返回true，并且由于if / else子句，您不会输入添加页面的代码部分。

所以变量

页

不包含任何数据，th:each循环将不执行任何操作。

如果您想要在输入无效数据时打印页面，您只需删除else。

Thymeleaf-Spring th：block和th：如果发生错误，每个都不再运行

1 个答案: