How to access Spring 3 MVC validator results in JSP without using form taglib

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暗喜
暗喜 2021-02-04 08:08

I have a simple Spring 3 MVC form using jsp taglibs. I need to add a class based on whether a field within the form has any errors associated with it or not. Here is a snipet

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  • 2021-02-04 08:46

    While this is a little more obscure I think it's simpler because it's a single line which is what it would be if I were just using scriplets like any sane Java dev should. Taglibs need to die die die die, then die some more. They are horrible and I can't believe Java devs still think they actually help and not waste our utter time. PHP developers laugh at us when we use those things.

    <div class="control-group ${requestScope['org.springframework.validation.BindingResult.user'].hasFieldErrors('firstName') ? 'error' : ''}">
    
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  • 2021-02-04 08:47

    There is a better way to get the error message

    <spring:hasBindErrors name="yourCommandName">
        ${errors.hasFieldErrors('userId') ? errors.getFieldError('userId').defaultMessage : ''}
    </spring:hasBindErrors>
    

    And one liner

     ${requestScope['org.springframework.validation.BindingResult.user'].hasFieldErrors('emailId') ? requestScope['org.springframework.validation.BindingResult.user'].getFieldError('emailId').defaultMessage : ''}
    
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  • 2021-02-04 08:51

    Did you try <spring:hasBindErrors> tag (I don't understand what you mean writing "without using form taglib")?

    <%@ taglib prefix="spring" uri="http://www.springframework.org/tags"%>
    
    <spring:hasBindErrors name="yourCommandName">
      <c:if test="${errors.hasFieldErrors('username')}">
        <c:set var="errorClass" value="error" />
      </c:if>
    </spring:hasBindErrors>
    
    <div class="control-group <c:out value='${errorClass}' />">
    

    Edit after comments:

    Inside <spring:hasBindErrors> tag there is errors variable (see Errors interface) bound to actual binding errors. You can check if field has errors via errors.hasFieldErrors(fieldName).


    And really obscure way to get field errors without any tag is requestScope['org.springframework.validation.BindingResult.yourCommandName'].hasFieldErrors('username')...

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