Dynamic amount of DateTime controls forwarded to controller

I’ve created a model that has its own class:

public class VMRequest()
{
    public int Id { get; set; }

    public List<Slot> Slots { get; set; }

    public class Slot()
    {
        public DateTime Date { get; set; }
    }
}

Then let’s say I add five Slots to the list, they show perfectly in a View if I do it like this:
<form asp-action="Request">
<div class="row flex-column">
    <div asp-validation-summary="ModelOnly" class="text-danger"></div>
        @foreach (var slot in Model.Slots)
        {
            <div class="col-md-6">
                <div class="form-group">
                    <label asp-for="@slot.Date" class="control-label"></label>
                    <input asp-for="@slot.Date" type="date" class="form-control" />
                    <span asp-validation-for="@slot.Date" class="text-danger"></span>
                </div>
            </div>              
        }
        <div class="form-group">
            <input type="submit" value="Create" class="btn btn-primary" />
        </div>
    </div>
</form>

But then on submission, even though the VMRequest model is passed to the controller, the changes on the view controls don’t pass – I have no idea how to pin identifiers to each of the controls??

I’m sure this is possible!?

Answers:

Thank you for visiting the Q&A section on Magenaut. Please note that all the answers may not help you solve the issue immediately. So please treat them as advisements. If you found the post helpful (or not), leave a comment & I’ll get back to you as soon as possible.

Method 1

Change your code to:

    @for(int x = 0; x < Model.Slots.Length;x++)
    {
        <div class="col-md-6">
            <div class="form-group">
                <label asp-for="@Model.Slots[x].Date" class="control-label"></label>
                <input asp-for="@Model.Slots[x].Date" type="date" class="form-control" />
                <span asp-validation-for="@Model.Slots[x].Date" class="text-danger"></span>
            </div>
        </div>              
    }

Then the form posted back will be correct.

Method 2

Each element needs to be named with an index to bind back to the model. There is a great example at https://haacked.com/archive/2008/10/23/model-binding-to-a-list.aspx/.

In Short:
Using a razor component within a for loop should handle this for you like:

for (int i = 0; i < 3; i++)
  @Html.TextBoxFor(m => m[i].Title)
  @Html.TextBoxFor(m => m[i].Author)
  @Html.TextBoxFor(m => m[i].DatePublished)
}


All methods was sourced from stackoverflow.com or stackexchange.com, is licensed under cc by-sa 2.5, cc by-sa 3.0 and cc by-sa 4.0

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