CODEWITHSUNDEEP
c#asp.net-mvcasp.net-mvc-4
Jefferson
Jefferson

Reputation: 93

MVC form data cant bind to the model

I have a MVC form where I am posting this data from JS over to this controller. I cant get this data to bind to the model. The current model is looking for the hidden field to be QuestionType[int] but I am not sure how to do that ant help would be great

html

<input data-val="true" data-val-required="The Char field is required." id="item_QuestionType_0_" name="item.QuestionType[0]" type="hidden" value="L">

view

@model List<MeetingPolling>
     int idx = 0;
     foreach (var item in Model)
            {
                <div class="form-group row">
                    <div class="col-md-12">
                        @Html.HiddenFor(m => Model[idx].QuestionType)
                        @Html.HiddenFor(x => item.QuestionType, new { @id = string.Format("hfQuestionType{0}", item.labelControl), @name = string.Format("hfQuestionType{0}", item.labelControl), Value = item.QuestionType })
                     </div>
                </div>
                idx++;
             }

current serialize data

item.QuestionType=LongAnswerText&1=sssssssssssssssssssssss&item.QuestionType=MultipleChoice&16=75

what model is looking for to be able to bind

QuestionType%5B0%5D=LongAnswerText&textboxfor_1=456456456456456456&QuestionType%5B1%5D=MultipleChoice&radioList_16=75

Model

public class PollingResponseFormViewModel
{
    public List<string> QuestionType { get; set; }
}

Upvotes: 0

Views: 399

Answers (1)

Dai
Dai

Reputation: 155145

You can't use a single Html.HiddenFor() field for a List<String> - you need to render those hidden inputs this way:

@for( Int32 i = 0; i < this.Model.QuestionType.Count; i++ ) {
    @Html.HiddenFor( m => m.QuestionType[i] )
}

You must use for, not foreach( var foo in this.Model.QuestionType ) because the Expression<> passed into HiddenFor needs the int indexer for the List<T> property.

Also, change your view-model so QuestionType is a pre-initialized, get-only property, as otherwise it will be null by default and mess with everything:

public class PollingResponseFormViewModel
{
    public List<string> QuestionType { get; } = new List<String>();
}

Upvotes: 1

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