How to make a combo With the days of the month?

Question

What is the best way to make a combobox with the days of the month?

That means the combo has to be from 1 to 31 days.

On the HTML side I have a label called "drpDia", and I need to load this label with numbers from 1 to 31. I know you can do this in Javascript, but I don’t know anything about Javascript, so I was going by C#, where I know more or less that I have to make a list from 1 to 31 and then I have to fill the label "drpDia" with these numbers. correct?

It will be a very important thing to this?

But I’ll have to press the DDA.

int[] numbers = new int[seats];
for (int i = 1; i <= seats; i++)
{
  numbers[i-1] = i;
}
comboBox1.Items.AddRange(numbers);

example:

Only when instead of having the days of the week is to have the days of the month where is Friday becomes 1, Saturday becomes 2 and so on until 31.

Answer 1

Well, I think I understand your question...

Assuming you have the number of the month and a ComboBox empty, we can do this in a few steps :

First : we need to find out how many days are there in the month:

 public static IEnumerable<DateTime> GetDiasNoMes(int mes, int? ano = null)
 {
    ano = ano ?? DateTime.Now.Year;
    return Enumerable.Range(1, DateTime.DaysInMonth(ano, mes))  // Dias: 1, 2 ... 31 etc. É um IEnumerable<int>
                     .Select(dia => new DateTime(ano, mes, dia)) // Mapeia as datas;
 }

According to : we need to popular the ComboBox:

var itens = dataSource.AddRange(GetDiasNoMes(10) //Pega de outubro
                       .Select(data => new SelectListItem
                       {
                           Value = data.Day.ToString(),
                           Text = data.Day.ToString()
                       }); 

comboBox1.Items.Clear(); //Vamos garantir que estaja vazio
comboBox1.Items.AddRange(itens);

Second () : Use jQuery Ajax to update

Controller :

[HttpGet]
public JsonResult Atualizar(int mes)
{
  var itens = GetDiasNoMes(mes) //Pega do mes 
                         .Select(data => data.Day);
  return Json(itens, JsonRequestBehavior.AllowGet);
}

View :

@Html.DropDownList("Mes", String.Empty)
@Html.DropDownList("Dia", null)

<script type="text/javascript">

$(() => {
   $( '#Mes' ).change( function () { //Quando o mês mudar/for selecionado entramos aqui

      let valor = $( this ).val(); //pegamos o valor

      $.ajax({ //Requisição
        url: '@Url.Action("Atualizar","MeuController")',
        data: { mes : valor }, //passamos o parametro para a ação
        success : ( lista ) => { // caso sucesso
           var dias = $( '#Dia' ); //dropdown

           dias.empty(); //limpamos as options

           lista.each( (index, data) => { //foreach
              dias.append( '<option value="' + data + '">' + data + '</option>' ); //adicionamos uma option
           });
        }
      });
   })
})

</script>

Answer 2

You can do this in two ways:

Adding the 31 days:

List<int> dias = new List<int>();

for (int i = 1; i <= 31; i++)
{
    dias.Add(i);
}

Adding the amount of days of a specific month:

int qtdDias = DateTime.DaysInMonth(DateTime.Now.Year, DateTime.Now.Month);

for (int i = 1; i <= qtdDias; i++)
{
    dias.Add(i);
}

Then adding the text on the label in the combobox selectionChanged event:

lblDias.Content = cmbAging.SelectedValue;

Adding the list to the combo:

cmbDias.ItemsSource = dias;

Answer 3

Simplest way to fill the combobox with the days of the month and leave the current day selected.

List<int> dias1 = new List<int>();
int diasdomes = DateTime.DaysInMonth(DateTime.Now.Year, DateTime.Now.Month);

   /*Preenchendo a lista com os dias do mês atual*/
            for (int i = 1; i <= diasdomes; i++)
            {
                dias1.Add(i);
            }
/*Preenchendo os items da ComboBox*/

            for (int i = 0; i < diasdomes; i++)
            {
                cbVencimento.Items.Insert(i, dias1[i]);
            }

/*Item selecionado da combobox como dia do mês atual*/
    cbVencimento.SelectedItem = DateTime.Today.Day;

Answer 4

I ended up doing so, after researching on the net:

  if (string.IsNullOrEmpty(Request["idDiaAmortizacaoCredito"]))
  {
       List<clDays> d = new List<clDays>();
       foreach (int x in Enumerable.Range(1, 31).ToList())                    
           d.Add(new clDays() { day = x });                    
          LoadDropDownList(drpDay, "day", "day", () => d);

          this.lblDay.Visible = this.lblSourceID.Visible = false;
          this.drpDay.Visible = this.drpSourceID.Visible = true;
  }