c# – Various Books for Author

Question:

I recently asked a question about my problem, but it got a little difficult to understand, here I will try to summarize my problem.

I am using ASP.NET MVC.

I have 2 tables: Autores and Livros , where 1 Autor has many Livros .

When I create the Autor and want to add another Livro , I have a button that creates my fields via jQuery , but when I save, my Controller only takes the 1st name, the other names I added by jQuery are not added correctly .

So let's go to the screen to register author (example):

     <div class="col-xs-12 col-md-4">
        @Html.LabelFor(model => model.Nome)
        @Html.EditorFor(model => model.Nome)
    </div>
    <div class="col-xs-12 col-md-4">
        @Html.LabelFor(model => model.NomeLivro)
        @Html.EditorFor(model => model.NomeLivro)
    </div>

    //DIV PARA RECEBER OS NOVOS CAMPOS
    <div id="divAddLivro"></div>

There I have my button for the jQuery call:

    <button id="btnAddLivro">Adicionar Livro</button>

my jQuery :

            $("#btnAddLivro").click(function () {
            $("#divAddLivro").append(''+
                        '<div class="col-xs-12 col-md-4">'+
                        '    @Html.LabelFor(model => model.Nome)'+
                        '    @Html.EditorFor(model => model.Nome)'+
                        '</div>'+
                        '<div class="col-xs-12 col-md-4">'+
                            '    @Html.LabelFor(model => model.NomeLivro)'+
                            '    @Html.EditorFor(model => model.NomeLivro)'+
                        '</div>' +
                '</div>');
            });

AUTHOR MODEL

public class Autor
{
    [Key]
    public int IdAutor { get; set; }

    public string Nome { get; set; }

    public ICollection<Livro> Livros{ get; set; }

}

BOOK TEMPLATE

public class Livro
{
    [Key]
    public int IdLivro { get; set; }

    public string Nome { get; set; }

    public int IdAutor { get; set; }

    public ICollection<Autor> Autores { get; set; }

}

Answer:

This way what you are doing will not work anyway. You are only handling html , but the server does not understand that you are passing a book list to the controller .

For that, the most recommended is to use the package BeginCollectionItem .

To use it, install it from NuGet with this command:

Install-Package BeginCollectionItem

Once that's done, let's make changes to your project.

You haven't posted your Models, so I'll assume you already have the Authors list for each book.

In your controller we need to create an Action to return a new author. To do this, add this Action in your Authors controller.

 public ActionResult GetNewAutor()
    {
        var autor = new Autor()

        return PartialView("_Autor", autor );
    }

In this Action we are creating a new author and returning a PartialView with it. Your PartialView will be the same as the code you used in append in your question. It will look like this:

@model Projeto.Autor//Altere isso

@using (Html.BeginCollectionItem("Livros"))//O nome da sua lista
{
    <div class="col-xs-12 col-md-4">
    @Html.LabelFor(model => model.Nome)
    @Html.EditorFor(model => model.Nome)
    </div>
    <div class="col-xs-12 col-md-4">
      @Html.LabelFor(model => model.NomeLivro)
      @Html.EditorFor(model => model.NomeLivro)
    </div>
}

The name Authors of this part @using (Html.BeginCollectionItem("Livros")) must be the same name as the virtual public virtual ICollection<Livros> Livros{get;set;} in your Model Authors.

In your view , we'll change the way to "duplicate" the field, using an ajax request to the controller .

<script>
    $('#btnAddLivro').click(function () {
        $.ajax({
            url: '@Url.Action("GetNewAutor", "Autores")',
            type: 'POST',
            success: function (data) {
                $('#new-autor').append(data);
            }
        });
    });

</script>

In this request we are adding another author to your code (performing the request in the controller ).

Note that in this part $('#new-autor').append(data); we are doing append() from PartialView() to the div with id="new-autor" . So just create an empty div with this id wherever the inputs are added, like this:

<div id="new-autor"></div>

By doing this, when you send a save, you will have a list of authors in your Model .

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