如何在Spring MVC中的同一页上显示错误消息 [英] How to show error message on same page in spring MVC
问题描述
我正在Spring MVC中使用表单数据调用控制器.
I am calling a controller in spring mvc with form data.
在保存之前,我检查ID是否在一定范围内.如果ID不在范围内,则需要在同一页面上显示一条消息,提示The id selected is out of Range, please select another id within range
.
Before saving, I check if the id is a certain range. If the id is not within the range, I need to show a message on the same page saying The id selected is out of Range, please select another id within range
.
我在Internet上找到了一些示例,可以在发生任何错误的情况下重定向到故障jsp.但是,就我而言,该怎么做?
I found samples on internet where I can redirect to failure jsp in case anything goes wrong. But how to do it in my case?
@RequestMapping(value = "/sendMessage")
public String sendMessage(@ModelAttribute("message") Message message,
final HttpServletRequest request) {
boolean check = userLoginService.checkForRange(message.getUserLogin());
if(!check){
return ""; //What Should I do here??????
}
}
推荐答案
一种简单的方法是将错误消息添加为模型属性.
A simple approach would be to add your error message as a model attribute.
@RequestMapping(value = "/sendMessage")
public String sendMessage(@ModelAttribute("message") Message message,
final HttpServletRequest request, Model model) {
boolean check = userLoginService.checkForRange(message.getUserLogin());
if(!check){
model.addAttribute("error", "The id selected is out of Range, please select another id within range");
return "yourFormViewName";
}
}
然后,您的jsp可以显示错误"属性(如果存在).
Then your jsp can display the "error" attribute if it exists.
<c:if test="${not empty error}">
Error: ${error}
</c:if>
编辑
这是通过ajax进行的未经验证的粗略实现.假设使用JQuery.
Edit
Here's a rough, untested implementation of validation over ajax. JQuery assumed.
添加一个请求映射以使ajax命中:
Add a request mapping for the ajax to hit:
@RequestMapping("/validate")
@ResponseBody
public String validateRange(@RequestParam("id") String id) {
boolean check = //[validate the id];
if(!check){
return "The id selected is out of Range, please select another id within range";
}
}
在客户端拦截表单提交并进行验证:
Intercept the form submission on the client side and validate:
$(".myForm").submit(function(event) {
var success = true;
$.ajax({
url: "/validate",
type: "GET",
async: false, //block until we get a response
data: { id : $("#idInput").val() },
success: function(error) {
if (error) {
$("#errorContainer").html(error);
success = false;
}
}
});
return success;
});
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