Problem when selecting in a combobox

**feanor91** · Jan 13, 2012, 1:27 PM

The data I bind are in post #3, and are good.

In post #9, I give a combo that didn't work with all information needed (I think).

**Daniil** · Jan 13, 2012, 2:15 PM

The following example works correctly for me.

Example Page

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

<%@ Register Assembly="Ext.Net" Namespace="Ext.Net" TagPrefix="ext" %>

<!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 runat="server">
    <title>Ext.NET Example</title>
</head>
<body>
    <form runat="server">
        <ext:ResourceManager runat="server" />
        <ext:ComboBox 
            runat="server" 
            DisplayField="someDisplayField"
            ValueField="someValueField" 
            EmptyText="Please choose a value">
            <Store>
                <ext:Store runat="server">
                    <Proxy>
                        <ext:HttpProxy Url="DataHandler.ashx" />
                    </Proxy>
                    <Reader>
                        <ext:JsonReader>
                            <Fields>
                                <ext:RecordField Name="someValueField" Type="Int" />
                                <ext:RecordField Name="someDisplayField" Type="String" />
                            </Fields>
                        </ext:JsonReader>
                    </Reader>
                </ext:Store>
            </Store>
            <Listeners>
                <BeforeQuery Handler="delete queryEvent.combo.lastQuery;" />
            </Listeners>
        </ext:ComboBox>
    </form>
</body>
</html>

Example HTTP Handler

using System.Web;
using Ext.Net;

namespace Work
{
    public class DataHandler : IHttpHandler
    {
        public void ProcessRequest(HttpContext context)
        {
            context.Response.Clear();
            context.Response.ContentType = "text/html";
            object data = new object[] 
            {
                new 
                {
                    someValueField = 1,
                    someDisplayField = "Item 1"
                },
                new 
                {
                    someValueField = 2,
                    someDisplayField = "Item 2"
                }
            };
            context.Response.Write(JSON.Serialize(data));
            context.Response.Flush();
        }

        public bool IsReusable
        {
            get
            {
                return false;
            }
        }
    }
}

**feanor91** · Jan 13, 2012, 2:47 PM

Yes, for me too, but it is my 2 combobox that did not work.

I made a lot of them in another projects and I never had this kind of problem. I really not understand what happened on this 2 particular combo...Is it a way I could enter into the javascript code during execution to see what hapened when I select a vaule?

**feanor91** · Jan 13, 2012, 2:55 PM

Just to try, I change the json return :

Here the new store :

<ext:Store ID="stoEntities" runat="server">
    <DirectEventConfig Json="false" ShowWarningOnFailure="False">
        <EventMask ShowMask="true" />
    </DirectEventConfig>
    <Proxy>
        <ext:HttpProxy Url="jsonDAL/ReturnJsonWorldRegion.aspx" Json="false" Timeout="3000">
        </ext:HttpProxy>
    </Proxy>
    <Reader>
        <ext:JsonReader>
            <Fields>
                <ext:RecordField Name="INT_idRmdEntities" Type="Int" Mapping="INT_idWorldRegion" />
                <ext:RecordField Name="STR_EntityName" type="String" mapping="STR_NameWorldRegion"/>
            </Fields>
        </ext:JsonReader>
    </Reader>        
</ext:Store>

I change nothing in the combo definition

The JSON data returned :

[{"INT_idWorldRegion":4,"STR_NameWorldRegion":"Africa"},{"INT_idWorldRegion":2,"STR_NameWorldRegion":"America"},{"INT_idWorldRegion":3,"STR_NameWorldRegion":"Asia-Pacifique"},{"INT_idWorldRegion":1,"STR_NameWorldRegion":"Europe"}]

And here, the combobox works as usual....So, problem seems to be in data returned but I'm not able to understand what happened.

**feanor91** · Jan 16, 2012, 8:13 AM

Hello

Problem solved.

i came from the definition of the field in the database.

Text field was 255 char longs, and apprently with that size, the serialize function put a carriage return in the JSON file that conduct to a JSON file misformated. I reduce the length of my field and all works well.

You can close the thread.

Thanks for your help.

**Daniil** · Jan 16, 2012, 8:16 AM

Thanks for the update, it can help someone on the forums in the future.

**feanor91** · Jan 16, 2012, 8:26 AM

Yes, I hope, BTW, it is very frustrating for me to see a thread solved with only "I found the problem, please close the thread" with no explanation on how the guy has solved it, a forum is made for helping people to find a solution and not to asks more question.

**Daniil** · Jan 16, 2012, 8:28 AM

Agree with you.

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