Java Spring MVC View Render and Bind ArrayList<CustomModel> back to Controller with Form Submit

Question

I am having problems posting my ArrayList back to my controller on a Form Submit. I can get my values by using something like this:

@RequestBody MultiValueMap<String, String> formData

But this is not what I want, and this also provides my CSRF values which I don't care to evaluate on my form Submit.

I have a wrapper model class that looks like this:

public class CustomPayCodesWrapper {

    public ArrayList<CustomPayCodesModel> customCodes;

    public ArrayList<CustomPayCodesModel> getCustomCodes() {
        return customCodes;
    }

    public void setCustomCodes(ArrayList<CustomPayCodesModel> customCodes) {
        this.customCodes = customCodes;
    }
}

And my Model:

public class CustomPayCodesModel {

    public String codeName;
    public String codeValue;

    public String getCodeName() {
        return codeName;
    }

    public void setCodeName(String codeName) {
        this.codeName = codeName;
    }

    public String getCodeValue() {
        return codeValue;
    }

    public void setCodeValue(String codeValue) {
        this.codeValue = codeValue;
    }
}

My .jsp:

<c:forEach var="item" items="${payCodes.customCodes}">
    <div class="row col-md-9">

         <div class="form-group row">
             <label for="payCode" class="col-md-2 col-form-label">${item.codeName}</label>
         <div class="col-md-10">
                 <input type="text" class="form-control" id="payCode" name="${item.codeName}" value="${item.codeValue}">
             </div>
         </div>

     </div>
 </c:forEach>

I have tried the following Controller bindings without any success:

@RequestMapping(value = "updateCustomPaymentCodes", method = RequestMethod.POST)
public ModelAndView updateCustomPayCodes(ModelAndView modelAndView, @ModelAttribute(value = "payCodes") CustomPayCodesWrapper userListWrapper, 
        ArrayList<CustomPayCodesModel> customCodes, @RequestBody MultiValueMap<String, String> formData, CustomPayCodesWrapper userListWrapper2) {


    return showCustomPaymentCodes(modelAndView);
}

K.Nicholas · Accepted Answer · 2019-06-26 17:02:13Z

1

+50

SpringMVC looks for specific field format in the html posted to parse parameters. In the case of an array it is looking for the name="customCodes[${status.index}].codeValue" field. This will be turned into the HTML that is name="customCodes[0].codeValue" and name="customCodes[1].codeValue" and so on. These fields will be found and used to bind to a List or Arrary element. I was able to get just the list with the following:

@PostMapping("/")
public ModelAndView updateCustomPayCodes(@ModelAttribute CustomPayCodesWrapper payCodes) {
    payCodes.customCodes.forEach(m->System.out.println(""+m.codeName+":"+m.codeValue));
    return buildModelAndView();
}

and

    <c:forEach items="${payCodes.customCodes}" var="customCode" varStatus="status">
        <div class="row col-md-9">        
             <div class="form-group row">
                 <label for="payCode" class="col-md-2 col-form-label">${customCode.codeName}</label>
                 <input type="hidden" name="customCodes[${status.index}].codeName" value="${customCode.codeName}"/>
             <div class="col-md-10">
                    <input type="text" class="form-control" name="customCodes[${status.index}].codeValue" value="${customCode.codeValue}"/>
                 </div>
             </div>
         </div>
     </c:forEach>

This based on the tutorial Spring MVC: Multiple Row Form Submit using List of Beans about doing the same

edited Jun 26, 2019 at 17:02

answered Jun 24, 2019 at 22:17

K.Nicholas

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2 Comments

Adam Over a year ago

Thank you, you are right. Using the hidden field + the index was the key. Without the hidden field the bindings do not work, go figure!

K.Nicholas Over a year ago

Thanks for accepting the answer. The hidden field didn't have anything to do with the binding. The name="customCodes[${status.index}].codeName" field and its format is what handles the binding. See updates.

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