How can I send a parameter from parent Datalist to child Datalist

Question

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I have a nested Datalist, they are filling from a database, I want the child Datalist will fill with an Id which is from Parent DataList...

I used a hidden field with panel, but it did not work!

Here is my code:

XML

<asp:DataList ID="dtlSubjectBox" runat="server" RepeatColumns="2" RepeatDirection="Horizontal"                                        Width="600" OnItemDataBound="OuterRepItemDataBound">                                                      <ItemTemplate> <table width="295" border="1" cellspacing="0" cellpadding="0" bgcolor="#ffffff">                                                               <tr> <asp:Panel ID="pnlChildView" runat="server">                                                                    <asp:HiddenField ID="hdnCompany" runat="server" Value='<%# DataBinder.Eval(Container.DataItem, "Id")%> ' />                                                            <td height="20" align="center" valign="middle">                                                                            <%# DataBinder.Eval(Container.DataItem, "Title")%>                                                            </td> </asp:Panel> </tr> <tr> <td align="right" valign="top"> <asp:DataList ID="dtlArticleBox" runat="server"> <ItemTemplate> <table width="295" cellspacing="0" cellpadding="0"> <tr> <td height="20" align="right" valign="middle"> * <%# DataBinder.Eval(Container.DataItem, "Title")%> </td> </tr>                                         </table> </ItemTemplate> </asp:DataList> </td> </tr>
</table> </ItemTemplate> </asp:DataList>

Code Behind is:

protected void Page_Load(object sender, EventArgs e)
{
if (!Page.IsPostBack)
{
dtlSubjectBox.DataSource = objSubject.getAllConfirmedDataOrderByIndex();
dtlSubjectBox.DataBind();
}
}

protected void OuterRepItemDataBound(object sender, DataListItemEventArgs e)
{
if (e.Item.ItemType == ListItemType.Item)
{
DataList dtlArticleBox = e.Item.FindControl("dtlArticleBox") as DataList;

HiddenField hdnCompany = (HiddenField)e.Item.NamingContainer.Parent.FindControl("hdnCompany");

dtlArticleBox.DataSource = objArticle.GetArticlesOfSubject(Helper.ParseInt(hdnCompany));
dtlArticleBox.DataBind();

}
}

Posted 9-Apr-14 4:40am

sheryi26

Updated 9-Apr-14 5:12am

v6

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2 solutions

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Murugesan22 · Answer 1 · 2014-04-09T05:37:00

Hi try this,

You have to select two table from Sqlserver one is parent datalist and another one is Child datalist we can make realationship with two table

C#

Import the header  <%@ Import Namespace="System.Data" %>

C#

<asp:datalist id="dtlSubjectBox" runat="server" repeatcolumns="2" repeatdirection="Horizontal" xmlns:asp="#unknown">
              Width="600">
              <itemtemplate>
                  <table width="295" border="1" cellspacing="0" cellpadding="0" bgcolor="#ffffff">
                      <tr>
                          <asp:panel id="pnlChildView" runat="server">
                              <asp:hiddenfield id="hdnCompany" runat="server" value="<%#Eval("Id")%> " />
                              <td height="20" align="center" valign="middle">
                                 <%#Eval("Title")%>
                              </td>
                          </asp:panel>
                      </tr>
                      <tr>
                          <td align="right" valign="top">
                              <asp:datalist id="dtlArticleBox" runat="server" datasource="<%# ((DataRowView)Container.DataItem).Row.GetChildRows("Relation") %>">
                                  <itemtemplate>
                                      <table width="295" cellspacing="0" cellpadding="0">
                                          <tr>
                                              <td height="20" align="right" valign="middle">
                                                  *
                                                 <%# DataBinder.Eval(Container.DataItem, "[\""Title"\"]")%>
                                              </td>
                                          </tr>
                                      </table>
                                  </itemtemplate>
                              </asp:datalist>
                          </td>
                      </tr>
                  </table>
              </itemtemplate>
          </asp:datalist>

and

Code Behind is

C#

 DS= objSubject.getAllConfirmedDataOrderByIndex();

DS.Relations.Add("Relation", DS.Tables[0].Columns["Title"], DS.Tables[1].Columns["Title"]);

                   dtlSubjectBox.DataSource = DS;
                   dtlSubjectBox.DataBind();

sheryi26 · Answer 2 · 2014-04-09T18:11:00

Dear Murugesan22, yes I added header part, too and I made some changes and it has this error message now...

The relation is not parented to the table to which this DataView points.

Would you please help me about it?

XML

<asp:DataList ID="dtlSubjectBox" runat="server" RepeatColumns="2" RepeatDirection="Horizontal"
                                        Width="600" OnItemDataBound="OuterRepItemDataBound">
                                        <ItemTemplate>
                                            <table width="295" border="1" cellspacing="0" cellpadding="0" bgcolor="#ffffff">
                                                <tr>

                                                        <td height="20" align="center" valign="middle">
                                                            <%# DataBinder.Eval(Container.DataItem, "Title")%>
                                                        </td>

                                                </tr>
                                                <tr>
                                                    <td align="right" valign="top">
                                                        <asp:DataList ID="dtlArticleBox" runat="server">
                                                            <ItemTemplate>
                                                                <table width="295" cellspacing="0" cellpadding="0">
                                                                    <tr>
                                                                        <td height="20" align="right" valign="middle">

                                                                           <%# ((DataRowView)Container.DataItem).Row.GetChildRows("Relation") %>

                                                                        </td>
                                                                    </tr>
                                                                </table>
                                                            </ItemTemplate>
                                                        </asp:DataList>
                                                    </td>
                                                </tr>
                                            </table>
                                        </ItemTemplate>
                                    </asp:DataList>

code behind:

protected void Page_Load(object sender, EventArgs e)
{
if (!Page.IsPostBack)
{BindData();

}
}

private void BindData()
{

SqlConnection cnn = new SqlConnection("Data Source=SHERY-PC;Initial Catalog=News;User ID=sa;Password=1234;Connection Timeout=30;");
SqlDataAdapter cmd1 = new SqlDataAdapter("SELECT [Id], [Title], [Confirmed], [OrderIndex] FROM NewsSubject WHERE [Confirmed]=1 ORDER BY [OrderIndex]", cnn);

DataSet ds = new DataSet();
cmd1.Fill(ds, "NewsSubject");

SqlDataAdapter cmd2 = new SqlDataAdapter("SELECT [Id], [Title] FROM NewsArticle WHERE ([Confirmed]=1 AND [SubjectId]=@SubjectId) ORDER BY [Id]", cnn);
cmd2.Fill(ds, "NewsArticle");

ds.Relations.Add("myrelation", ds.Tables["NewsSubject"].Columns["Title"], ds.Tables["NewsArticle"].Columns["Title"]);

dtlSubjectBox.DataSource = ds.Tables["NewsSubject"];
dtlSubjectBox.DataBind();
}

protected void OuterRepItemDataBound(object sender, DataListItemEventArgs e)
{
if (e.Item.ItemType == ListItemType.Item)
{

DataRowView drv = e.Item.DataItem as DataRowView;

DataList dtlArticleBox = e.Item.FindControl("dtlArticleBox") as DataList;
dtlArticleBox.DataSource = drv.CreateChildView("myrelation");
dtlArticleBox.DataBind();

}

}

How can I send a parameter from parent Datalist to child Datalist

2 solutions

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