[CLOSED] Null Reference Object Ajax

**Oliver** · May 30, 2012, 2:06 AM

Hello!

I'm trying to make some calculations after select a product but I receive the message "System.NullReferenceException"

Detail:
[NullReferenceException: Referência de objeto não definida para uma instância de um objeto.]
Ext.Net.Observable.FireAsyncEvent(String eventName, ParameterCollection extraParams) +181
Ext.Net.ResourceManager.RaisePostBackEvent(String eventArgument) +1932
System.Web.UI.Page.RaisePostBackEvent(IPostBackEve ntHandler sourceControl, String eventArgument) +13
System.Web.UI.Page.RaisePostBackEvent(NameValueCol lection postData) +176
System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +5563

Here my code, the problem occurs when I use DirectEvents to call the method "recalcularValores":

<%@ Control Language="C#" %>
<%@ Import Namespace="System.Linq" %>
<%@ Import Namespace="System.Data" %>
<%@ Import Namespace="System.Collections" %>
<%@ Import Namespace="System.Collections.Generic" %>
<%@ Register Assembly="Ext.Net" Namespace="Ext.Net" TagPrefix="ext" %>
<script runat="server">

    ModeloDataContext dcItem = new ModeloDataContext();

    protected void Page_Load(object sender, EventArgs e)
    {
        if (!X.IsAjaxRequest)
        {
            //this.PedidoItemStore.DataSource = listarCadastro();
            //this.PedidoItemStore.DataBind();
        }
    }

    protected void recalcularValores(object sender, DirectEventArgs e)
    {
        this.dbVlrUnitario.Text = "2.5";
        if (this.dbVlrDesconto.Text != "" && this.dbVlrUnitario.Text != "") this.dbVlrCustoUnitario.Text = Convert.ToString(Convert.ToDouble(this.dbVlrUnitario.Text) - Convert.ToDouble(this.dbVlrDesconto.Text));
        if (this.dbVlrCustoUnitario.Text != "" && this.dbQtdPedido.Text != "") this.dbVlrTotalitem.Text = Convert.ToString(Convert.ToDouble(this.dbVlrCustoUnitario.Text) - Convert.ToDouble(this.dbQtdPedido.Text));
    }


    public void posicionarProduto()
    {

        var lista = from f in dcItem.Produtos
                    orderby f.cNmProduto
                    select new
                    {
                        f.nCdProduto,
                        f.cNmProduto
                    };

        this.StoreProduto.DataSource = lista;
        this.StoreProduto.DataBind();
    }

    public Store GridStore { get; set; }

    public void Show()
    {
        this.PedidoItemDetailsWindow.Show();
    }

    protected void SavePedidoItem(object sender, DirectEventArgs e)
    {
        //NorthwindDataContext db = new NorthwindDataContext();
        //int id = int.Parse(e.ExtraParams["id"]);

        //Employee empl = Employee.GetEmployee(id, db);

        ////Company
        //empl.FirstName = this.FirstName.Text;
        //empl.LastName = this.LastName.Text;
        //empl.Title = this.Title.Text;

        //if (!string.IsNullOrEmpty(this.ReportsTo.SelectedItem.Value))
        //{
        //    empl.ReportsTo = int.Parse(this.ReportsTo.SelectedItem.Value);
        //}
        //else
        //{
        //    empl.ReportsTo = null;
        //}

        //empl.HireDate = this.HireDate.SelectedDate;
        //empl.Extension = this.Extension.Text;

        ////Personal
        //empl.Address = this.Address.Text;
        //empl.City = this.City.Text;
        //empl.PostalCode = this.PostCode.Text;
        //empl.HomePhone = this.HomePhone.Text;
        //empl.TitleOfCourtesy = this.TitleCourt.Text;
        //empl.BirthDate = this.BirthDate.SelectedDate;
        //empl.Region = this.Region.Text;
        //empl.Country = this.Country.Text;
        //empl.Notes = this.Note.Text;

        //db.SubmitChanges();

        //var record = this.GridStore.GetById(id);        

        //this.EmployeeDetailsWindow.Hide();
        //CompanyInfoTab.UpdateRecord(record);
        //PersonalInfoTab.UpdateRecord(record);
        //record.Commit();
    }
</script>
<ext:Window ID="PedidoItemDetailsWindow" runat="server" Icon="BookEdit" Title="Item do Pedido"
    Width="500" Height="350" AutoShow="false" Modal="true" Hidden="true" Layout="Fit">
    <Items>
        <ext:FormPanel ID="DadosProdutoform" runat="server" Title="Dados do Produto" Icon="BookNext"
            DefaultAnchor="100%" BodyPadding="5" Frame="true">
            <Items>
                <ext:TextField ID="dbCdItemPedido" runat="server" FieldLabel="Item Pedido" Name="dbCdItemPedido"
                    Width="200" Disabled="true" />
                <ext:ComboBox ID="dbProdutoCodigo" runat="server" FieldLabel="Produto" Name="dbProdutoCodigo"
                    AllowBlank="false" DisplayField="cNmProduto" ValueField="nCdProduto" TypeAhead="true"
                    QueryMode="Local" ForceSelection="true" TriggerAction="Query" EmptyText="Selecione um produto..."
                    Width="450" SubmitValue="true">
                    <Store>
                        <ext:Store runat="server" ID="StoreProduto">
                            <Model>
                                <ext:Model ID="Model1" runat="server" IDProperty="nCdProduto">
                                    <Fields>
                                        <ext:ModelField Name="nCdProduto" />
                                        <ext:ModelField Name="cNmProduto" />
                                    </Fields>
                                </ext:Model>
                            </Model>
                        </ext:Store>
                    </Store>
                    <DirectEvents>
                        <Select OnEvent="recalcularValores" />
                    </DirectEvents>
                </ext:ComboBox>
                <ext:TextField ID="dbQtdPedido" runat="server" FieldLabel="Qtd Pedido" Disabled="false"
                    Name="dbQtdPedido" Width="200">
                </ext:TextField>
                <ext:TextField ID="dbVlrUnitario" runat="server" FieldLabel="Vlr Unitário" Name="dbVlrUnitario"
                    Width="200" Disabled="true">
                </ext:TextField>
                <ext:TextField ID="dbVlrDesconto" runat="server" FieldLabel="Vlr Desconto" Name="dbVlrDesconto"
                    Width="200">
                </ext:TextField>
                <ext:TextField ID="dbVlrCustoUnitario" runat="server" FieldLabel="Custo Unitário"
                    Name="dbVlrCustoUnitario" Width="200" Disabled="true" />
                <ext:TextField ID="dbVlrTotalitem" runat="server" FieldLabel="Vlr Total Item" Name="dbVlrTotalitem"
                    Width="200" Disabled="true" />
            </Items>
        </ext:FormPanel>
    </Items>
    <Buttons>
        <ext:Button ID="SaveButton" runat="server" Text="Salvar" Icon="Disk">
            <DirectEvents>
                <Click OnEvent="SavePedidoItem" Failure="Ext.MessageBox.alert('Gravação Falhou', 'Erro durante processo de gravação');">
                    <EventMask ShowMask="true" Target="CustomTarget" CustomTarget="={#{PedidoItemDetailsWindow}.body}" />
                    <ExtraParams>
                        <ext:Parameter Name="id" Value="#{EmployeeID1}.getValue()" Mode="Raw" />
                    </ExtraParams>
                </Click>
            </DirectEvents>
        </ext:Button>
        <ext:Button ID="CancelButton" runat="server" Text="Cancelar" Icon="Cancel">
            <Listeners>
                <Click Handler="this.up('window').hide();" />
            </Listeners>
        </ext:Button>
    </Buttons>
</ext:Window>

Thanks in advance,

Oliver

**Vladimir** · May 30, 2012, 9:38 AM

Please post a test case reproduces the issue

**Oliver** · May 30, 2012, 6:31 PM

Hi Vladimir,

Here an example reproducing the problem.

Thanks,

Oliver

File TesteCall.aspx:

<%@ Page Language="C#" %>

<%@ Register Assembly="Ext.Net" Namespace="Ext.Net" TagPrefix="ext" %>
<%@ Register src="~/Objetos/Views/Teste.ascx" tagname="WindowEditor" tagprefix="uc1" %>

<script runat="server">
   

    protected void Page_Load(object sender, EventArgs e)
    {        
        this.WindowEditor1.Show();            
    }

</script>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
	"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml">
<head id="Head1" runat="server">
    <title>Ext.NET Teste Case</title>
    <link href="../../../../resources/css/examples.css" rel="stylesheet" type="text/css" />
   
</head>
<body>
    <form id="Form1" runat="server">
        <ext:ResourceManager ID="ResourceManager1" runat="server" />
        
 
        
        <uc1:WindowEditor ID="WindowEditor1" runat="server" />
    </form>
</body>
</html>

File Teste.ascx:

<%@ Control Language="C#" %>
<%--<%@ Import Namespace="Ext.Net.Examples.Northwind"%>--%>
<%@ Import Namespace="System.Linq" %>
<%@ Import Namespace="System.Data" %>
<%@ Import Namespace="System.Collections" %>
<%@ Import Namespace="System.Collections.Generic" %>
<%@ Register Assembly="Ext.Net" Namespace="Ext.Net" TagPrefix="ext" %>
<script runat="server">

    public string tipoAcessoItem = "";

    protected void Page_Load(object sender, EventArgs e)
    {
        if (!X.IsAjaxRequest)
        {
            //Posicionar Registro
            //this.PedidoItemStore.DataSource = listarCadastro();
            //this.PedidoItemStore.DataBind();
        }
    }

    public void IncluirPedidoItem()
    {
    }


    protected void recalcularValores(object sender, DirectEventArgs e)
    {
        this.dbVlrUnitario.Text = "2.5";
        if (this.dbVlrDesconto.Text != "" && this.dbVlrUnitario.Text != "") this.dbVlrCustoUnitario.Text = Convert.ToString(Convert.ToDouble(this.dbVlrUnitario.Text) - Convert.ToDouble(this.dbVlrDesconto.Text));
        if (this.dbVlrCustoUnitario.Text != "" && this.dbQtdPedido.Text != "") this.dbVlrTotalitem.Text = Convert.ToString(Convert.ToDouble(this.dbVlrCustoUnitario.Text) - Convert.ToDouble(this.dbQtdPedido.Text));
    }

    public void PosicionarPedidoItem(Pedido objPedidoCabecalho, ItemPedido objItem, string _tipoAcessoItem)
    {
    }

    public void posicionarProduto()
    {

        return;        
    }

    public Store GridStore { get; set; }

    public void Show()
    {
        this.PedidoItemDetailsWindow.Show();
    }

    protected void SavePedidoItem(object sender, DirectEventArgs e)
    {
    }
</script>
<ext:Window ID="PedidoItemDetailsWindow" runat="server" Icon="BookEdit" Title="Item do Pedido"
    Width="500" Height="350" AutoShow="false" Modal="true" Hidden="true" Layout="Fit">
    <Items>
        <ext:FormPanel ID="DadosProdutoform" runat="server" Title="Dados do Produto" Icon="BookNext"
            DefaultAnchor="100%" BodyPadding="5" Frame="true">
            <Items>
                <ext:TextField ID="dbCdItemPedido" runat="server" FieldLabel="Item Pedido" Name="dbCdItemPedido"
                    Width="200" Disabled="true" />
                <ext:ComboBox ID="dbProdutoCodigo" runat="server" FieldLabel="Produto" Name="dbProdutoCodigo"
                    AllowBlank="false" TypeAhead="true"
                    QueryMode="Local" ForceSelection="true" TriggerAction="Query" EmptyText="Selecione um produto..."
                    Width="450" SubmitValue="true">
                        <Items>
                            <ext:ListItem Text="Produto 1" Value="1" />
                            <ext:ListItem Text="Produto 2" Value="2" />
                        </Items>
                    <DirectEvents>
                        <Select OnEvent="recalcularValores" />
                    </DirectEvents>
                </ext:ComboBox>
                <ext:TextField ID="dbQtdPedido" runat="server" FieldLabel="Qtd Pedido" Disabled="false"
                    Name="dbQtdPedido" Width="200">
                </ext:TextField>
                <ext:TextField ID="dbVlrUnitario" runat="server" FieldLabel="Vlr Unitário" Name="dbVlrUnitario"
                    Width="200" Disabled="true">
                </ext:TextField>
                <ext:TextField ID="dbVlrDesconto" runat="server" FieldLabel="Vlr Desconto" Name="dbVlrDesconto"
                    Width="200">
                </ext:TextField>
                <ext:TextField ID="dbVlrCustoUnitario" runat="server" FieldLabel="Custo Unitário"
                    Name="dbVlrCustoUnitario" Width="200" Disabled="true" />
                <ext:TextField ID="dbVlrTotalitem" runat="server" FieldLabel="Vlr Total Item" Name="dbVlrTotalitem"
                    Width="200" Disabled="true" />
            </Items>
        </ext:FormPanel>
    </Items>
    <Buttons>
        <ext:Button ID="SaveButton" runat="server" Text="Salvar" Icon="Disk">
            <DirectEvents>
                <Click OnEvent="SavePedidoItem" Failure="Ext.MessageBox.alert('Gravação Falhou', 'Erro durante processo de gravação');">
                    <EventMask ShowMask="true" Target="CustomTarget" CustomTarget="={#{PedidoItemDetailsWindow}.body}" />
                    <ExtraParams>
                        <ext:Parameter Name="id" Value="#{EmployeeID1}.getValue()" Mode="Raw" />
                    </ExtraParams>
                </Click>
            </DirectEvents>
        </ext:Button>
        <ext:Button ID="CancelButton" runat="server" Text="Cancelar" Icon="Cancel">
            <Listeners>
                <Click Handler="this.up('window').hide();" />
            </Listeners>
        </ext:Button>
    </Buttons>
</ext:Window>

**Daniil** · May 31, 2012, 2:03 PM

Hi,

Please clarify what are the steps to reproduce the exception?

When I select any items in the ComboBox, no error are throwing.

When I click the "Salvar" button, it throws

Ext.get("EmployeeID1") is null

JS error due to

<ext:Parameter Name="id" Value="#{EmployeeID1}.getValue()" Mode="Raw" />

because there is no control with "EmployeeID1" ID in the user control.

**Daniil** · May 31, 2012, 3:03 PM

By the way, is the issue reproducible with the latest sources from SVN or NuGet?

**Oliver** · May 31, 2012, 4:09 PM

Originally Posted by Daniil

Hi,

Please clarify what are the steps to reproduce the exception?

When I select any items in the ComboBox, no error are throwing.

When I click the "Salvar" button, it throws

Ext.get("EmployeeID1") is null

JS error due to

<ext:Parameter Name="id" Value="#{EmployeeID1}.getValue()" Mode="Raw" />

because there is no control with "EmployeeID1" ID in the user control.

Hi Daniil,

The error are throwing when I select any item in Combobox, maybe can be a version problem.

I´m using the beta version by nugget.

Thanks

**Daniil** · May 31, 2012, 6:59 PM

There was the Ext.NET NuGet update this week. Please update and retest.

**Oliver** · Jun 01, 2012, 1:18 PM

Hi Daniil,

After update the version works.

Thanks,

Oliver

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