It didn't help me, the rowExpands is not fired.
My WHDG has  InitialDataBindDepth set to "1"   and InitialRowExpandState set to "Expanded" 

I don't know how to modify background-color while checking column value :s

Hi Radoslav,

it was the reason! I have cleared database like you told me in 'ValueChanged' event of my DDL, and it solves the problem!

Thanks a lot.

Best Regards

Damien

Hello,

Thanks for the detailed explanations, 

I would suggest clear the datasource right before assign a new one like this :

        WebHierarchicalDataGrid1.GridView.ClearDataSource();

        WebHierarchicalDataGrid1.Columns.Clear();

        WebHierarchicalDataGrid1.Rows.Clear();

It looks like that the gird is confused when the datasource is changed in this particular way.  When the grid performs AJAX request it expects to get the  same datasorce but in your case it was changed. 

Please try the above suggestion.

Thanks.

Hello Radoslav,

I will try to explain you the running, then I will give you the code:

I have a dropdown List with some data. The grid data depend on the value choosen in this dropdownlist. Please see in picture I have enclosed:

(I have also enclosed the error message, with and without debugging, it could help you.)

I will give you 2 ways that give the error, because it is little strange.

1^st way:

1-       I launch my page, there is a default value on the dropdown list, and I have no problem to expand levels.

2-       Then I change value in the drop down list: data for top level are correctly displayed

3-       I try to expand, I have my error message

2^nd way:

1-       I launch my page, there is a default value on the dropdown list, I do not expand levels.

2-       I change the value in my dropdown List: data for top level are correctly displayed

3-       I expand my level, all it is correct

4-       I change again my value in the dropdown: data for top level are correctly displayed

5-       I try to expand, I have my error message

So the problem appears each time I expand the grid, change value in dropdown then expand it again…

If I set my property ‘EnableAjax’ to false, I have no more problems.

Please find below my grid declaration: in aspx file:

<ig:WebHierarchicalDataGrid ID="GridSampleSize" runat="server" AutoGenerateBands="False"

    AutoGenerateColumns="False" EnableAjax="true" Height="450px" Width="746px" DataKeyFields="MAINKEY,SAMPLESIZE,PHASE"

    ClientEvents-Initialize="gridInit">

    <AjaxIndicator Enabled="False" />

    <ClientEvents RowExpanded="rowExpanded"/>

    <Columns>

        <ig:BoundDataField DataFieldName="PHASE" Key="PHASE">

            <Header Text="<%$ Resources:Labels, lblPHASE %>" />

        </ig:BoundDataField>

        <ig:BoundDataField DataFieldName="APPROVED" Key="APPROVED">

            <Header Text="APPROVED" />

        </ig:BoundDataField>

        <ig:BoundDataField DataFieldName="REJECTED" Key="REJECTED">

            <Header Text="REJECTED" />

        </ig:BoundDataField>

    </Columns>

    <Bands>

        <ig:Band AutoGenerateColumns="False" DataMember="dsMeasSampleSizeEnfant2_DefaultView"

            Key="dsMeasSampleSizeEnfant2_DefaultView">

            <Columns>

                <ig:BoundDataField DataFieldName="POINT" Key="POINT" Width="50px">

                    <Header Text="<%$ Resources:Labels, lblPOINT %>" />

                </ig:BoundDataField>

                <ig:BoundDataField Width="250px" DataFieldName="DESCRIPT" Key="DESCRIPT">

                    <Header Text="<%$ Resources:Labels, lblDESCRIPT %>" />

                </ig:BoundDataField>

                <ig:BoundDataField DataFieldName="TOLERANCE" Key="TOLERANCE" Width="50px" DataType="System.Decimal">

                    <Header Text="<%$ Resources:Labels, lblTOLERANCE %>" />

                </ig:BoundDataField>

                <ig:BoundDataField DataFieldName="SIZE" Key="SIZE" Width="50px" DataType="System.Decimal">

                    <Header Text="SIZE" />

                </ig:BoundDataField>

                <ig:BoundDataField DataFieldName="SUPVAL" Key="SUPVAL" Width="140px" DataType="System.Decimal">

                    <Header Text="<%$ Resources:Labels, lblSUPVAL %>" />

                </ig:BoundDataField>

            </Columns>

            <Behaviors>

                <ig:EditingCore>

                    <Behaviors>

                        <ig:CellEditing Enabled="true" EditModeActions-EnableF2="true">

                            <ColumnSettings>

                                <ig:EditingColumnSetting ColumnKey="POINT" ReadOnly="true" />

                                <ig:EditingColumnSetting ColumnKey="DESCRIPT" ReadOnly="true" />

                                <ig:EditingColumnSetting ColumnKey="TOLERANCE" ReadOnly="true" />

                                <ig:EditingColumnSetting ColumnKey="SIZE" ReadOnly="true" />

                            </ColumnSettings>

                        </ig:CellEditing>

                    </Behaviors>

                </ig:EditingCore>

            </Behaviors>

        </ig:Band>

    </Bands>

    <Behaviors>

        <ig:Sorting>

        </ig:Sorting>

    </Behaviors>

    <Behaviors>

        <ig:Activation ActiveRowCssClass="igg_ActiveRow" ActiveCellCssClass="igg_ActiveCell"

            Enabled="true" />

    </Behaviors>

</ig:WebHierarchicalDataGrid>

And below the aspx.cs page: (I bind data in this file, calling web services methods to select data)

protected void LoadDS()

{

   StringBuilder builderGridEnfant1 = new StringBuilder();

   StringBuilder builderGridEnfant2 = new StringBuilder();

   DataSet dsMeasSampleSizeEnfant1 = new DataSet();

   DataSet dsMeasSampleSizeEnfant2 = new DataSet();

   string getSampleSize;

   if (this.IsNullOrEmpty(ChoiceOfSampleSize.SelectedValue.ToString()))

      getSampleSize = HttpContext.Current.Session["SAMPLESIZE"].ToString();

   else

      getSampleSize = ChoiceOfSampleSize.SelectedValue.Trim();

   builderGridEnfant1.Append("SELECT DISTINCT MAINKEY, SAMPLESIZE, PHASE, PHASE_LEV, APPROVED, REJECTED ");

   builderGridEnfant1.Append(" FROM " + getProxyComment.GetBrandName() + ".MEASSAMPLESIZES ");

   builderGridEnfant1.Append("WHERE ");

   builderGridEnfant1.Append("MAINKEY = '" + this.GetStyleID + "' AND CODE='1' AND SAMPLESIZE='" + getSampleSize.Trim() + "' ORDER BY SAMPLESIZE,PHASE_LEV");

   builderGridEnfant2.Append("SELECT DISTINCT MAINKEY, MAINKEY, PHASE ,PHASE_LEV, SAMPLESIZE, POINT, TOLERANCE, DESCRIPT, ");

   builderGridEnfant2.Append("SIZE, SUPVAL, APPROVED, REJECTED  FROM " + getProxyComment.GetBrandName() + ".MEASSAMPLESIZES ");

   builderGridEnfant2.Append("WHERE ");

   builderGridEnfant2.Append("MAINKEY = '" + this.GetStyleID + "' AND CODE='1' AND SAMPLESIZE='" + getSampleSize.Trim() + "' ORDER BY SAMPLESIZE,PHASE_LEV,POINT");

   getProxyComment.Timeout = 5000;

   dsMeasSampleSizeEnfant1 = getProxyComment.GetTableView(builderGridEnfant1.ToString());

   dsMeasSampleSizeEnfant1.Tables[0].TableName = "GridDataEnfant1";

   dsMeasSampleSizeEnfant2 = getProxyComment.GetTableView(builderGridEnfant2.ToString());

   dsMeasSampleSizeEnfant2.Tables[0].TableName = "GridDataEnfant2";

   Infragistics.Web.UI.DataSourceControls.DataView dvEnfant1 = new Infragistics.Web.UI.DataSourceControls.DataView();

   dvEnfant1.ID = "dsMeasSampleSizeEnfant1_DefaultView";

   dvEnfant1.DataMember = "DefaultView";

   dvEnfant1.DataSource = dsMeasSampleSizeEnfant1;

   Infragistics.Web.UI.DataSourceControls.DataView dvEnfant2 = new Infragistics.Web.UI.DataSourceControls.DataView();

   dvEnfant2.ID = "dsMeasSampleSizeEnfant2_DefaultView";

   dvEnfant2.DataMember = "DefaultView";

   dvEnfant2.DataSource = dsMeasSampleSizeEnfant2;

   WebHierarchicalDataSource hdsMain = new WebHierarchicalDataSource();

   hdsMain.DataViews.Add(dvEnfant1);

   hdsMain.DataViews.Add(dvEnfant2);

   //Defining relation.

   Infragistics.Web.UI.DataSourceControls.DataRelation drMain1 = new Infragistics.Web.UI.DataSourceControls.DataRelation();

   drMain1.ParentDataViewID = "dsMeasSampleSizeEnfant1_DefaultView";

   drMain1.ChildDataViewID = "dsMeasSampleSizeEnfant2_DefaultView";

   drMain1.ParentColumns = new string[] { "MAINKEY,SAMPLESIZE,PHASE" };

   drMain1.ChildColumns = new string[] { "MAINKEY,SAMPLESIZE,PHASE" };

   hdsMain.DataRelations.Add(drMain1);

   GridSampleSize.DataKeyFields = "MAINKEY,SAMPLESIZE,PHASE";

   GridSampleSize.DataMember = "dsMeasSampleSizeEnfant1_DefaultView";

   GridSampleSize.DataSource = hdsMain;

   GridSampleSize.Key = "dsMeasSampleSizeEnfant1_DefaultView";

}

This method is called in page_Load and when the value in my dropdown list is changed.

Thanks for your time!

Best Regards

Damien

Hello Damien,

You should not get any errors in combination of EnableAjax= true and RowExpanded event. I need more information regarding your scenario. Please can you post your  code related to the gird here  ( aspx declaration /  code-behind). 

Thank you.