how to show validation error in jsp in spring mvc

Question

I want to show validation error in my jsp page.

My object is:

public class MyObjectDTO{ @valid private TextDTO text1; @valid private TextDTO text2 }

public class TextDTO{ @NotBlank private String code;@NotBlank private String label;}

My controller:

@RequestMapping(value = "/create", method = RequestMethod.POST)
public String creationProjet(@Valid @ModelAttribute MyObjectDTO obj, BindingResult result,
                             Model model) {
    if (result.hasErrors()) {
        model.addAttribute("hasErrors", true);
        return "create";
    } else {
        ....
        return "redirect:/list";
    }
}

my jsp

<div class="col-md-6 form-group ${requestScope['org.springframework.validation.BindingResult.obj'].hasFieldErrors('text1') ? 'has-error' : ''}">
    <label class="col-lg-3 control-label">my label</label>
    <div class="col-lg-5">
        <form:select class="form-control" name="type" path="text1.code" id="selectType">
    <option value="">---------</option>
            <c:forEach items="${types }" var="type">
                <form:option value="${type.id }">
                    <c:out value=" ${type.code}"></c:out>
                </form:option>
            </c:forEach>
        </form:select>
        <form:errors path="text1.code" class="has-error  error"></form:errors>
    </div>
</div>

My controller redirects to the page create but the errors are not showing. In debug mode there is one error that indicates text1.code cannot be a blank.

score 5 · Answer 1 · edited May 23 '17 at 12:01

In your Jsp page add following line

<div class="col-md-6 form-group ${requestScope['org.springframework.validation.BindingResult.obj'].hasFieldErrors('text1') ? 'hasErrors' : ''}">

or use hasFieldErrors() instead

<div class="col-md-6 form-group ${requestScope['org.springframework.validation.BindingResult.obj'].hasFieldErrors()}">

And About addAttributes("hasErrors",true), use addFlashAttribute() which is store in flashmap and Object (In your case Error Message will be alive when you navigate to create page or redirect between two controller.) Look at this for more

In your controller Add RedirectAttributes Object like this

@RequestMapping(value = "/create", method = RequestMethod.POST)
public String creationProjet(@Valid @ModelAttribute MyObjectDTO obj,     
BindingResult result,
RedirectAttributes redirectAtt,
Model model) {
if (result.hasErrors()) {
    redirectAtt.addFlashAttribute("hasErrors","ur message");//instead of true you can write your own message 
    return "create";
} else {
    ....
    }
    return "redirect:/list";
}

}

If you write your own message instead of true

<c:if test="${not empty hasErrors">
     <p>${hasErrors}</p>
</c:if>

i've used this in my jsp `
` and in my page i'm not using something to read attributs putted in model, i use this ` ` — Sami Asmar, Sep 09 '16 at 08:55

score 0 · Answer 2 · answered Sep 08 '16 at 15:13

0

only you missing is put part to model map.You are putting only flag. But you need to put result.

if(result.hasErrors()){             
    mm.addAttribute("errors", result);
    return "create";
}

answered Sep 08 '16 at 15:13

Sanka

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in my jsp i don't use this flag `mm.addAttribute("errors", result);` – Sami Asmar Sep 09 '16 at 08:52
it is not flag.it contain the all binding result collection.just try it and let me know. – Sanka Sep 09 '16 at 08:54
i agree with you but when we put something in the model with this `mm.addAttribute("errors", result);` we should read it in the page but me i use ` ` and its work for non complex object – Sami Asmar Sep 09 '16 at 08:58
my form begin with : `` – Sami Asmar Sep 09 '16 at 09:55
instead of try – Sanka Sep 09 '16 at 10:13
there are no relation between id, name and what we talk about, for your informations in debug mode there are all the errors in result object and spring form:error should show the errors in the page, but in this case form:error dont do that, i dont know what's the prob – Sami Asmar Sep 09 '16 at 10:50
how spring tally with [form:errors path="text1.code"] [form:select id="selectType"] – Sanka Sep 09 '16 at 10:57
try with @ModelAttribute("obj") – Sanka Sep 09 '16 at 11:06
the object obj is located implicitly by spring, because i use the same name in the form tag – Sami Asmar Sep 09 '16 at 11:20

how to show validation error in jsp in spring mvc

2 Answers2