I use select and it is populated from the database:
<select asp-for="CategoriaID" asp-items="@Model.CountryList" id="cbcategoria" class="form-control">
</select>
And here's how it's in the controller:
model.CountryList = new SelectList(countries, "Id", "Value");
I would like to know how I can leave the unfilled ones when inserting a new record? The field is required in the ViewModel.
You can add an option with the disabled option so that it is not selected.
<select asp-for="CategoriaID" asp-items="@Model.CountryList" id="cbcategoria" class="form-control">
<option disabled selected>Selecione</option>
</select>
From what I understand you want the first select item to be white, you can do in the page load.
$("#cbcategoria").append("<option id='option_cbcategoria' value='' selected>" + "" + " </option>");