Want to win a PS4? Go Premium and enter to win our High-Tech Treats giveaway. Enter to Win

x
?
Solved

Can't get nested repeater to populate

Posted on 2010-11-30
12
Medium Priority
?
644 Views
Last Modified: 2012-06-27
I have a page I'm programming that has a nested repeater like this:

Repeater 1 - Heading - Degree Name
some information about the degree.
some more information about the degree.

Nested Repeater2 - Required Courses
- COURSE A
- COURSE B
- COURSE C

Reapeater 1 - Heading 2 - Thesis Option
some information here
some more information here

Nested Repeater 2 - Required courses
- COURSE D
- COURSE E
- COURSE F

I need to do things to the courses in the back end, like make them visible, or hide them based on if there's a link or not.   I am populating the reader and the repeater in the code-behind, but I think I'm doing this in the wrong event handlers because the page is ignoring the event code completely.


<asp:Repeater ID="degreeDetail" runat="server" DataSourceID="dsDegree" OnItemDataBound="Repeater1_ItemDataBound"> 
<ItemTemplate>
    <asp:HiddenField ID="hdnID" runat="server" Value='<%# Eval("ID") %>' />
    <h1><asp:Label ID="lblDegreeName" runat="server" Text='<%# Eval("degreeName") %>'></asp:Label></h1>
    <p><asp:Literal ID="litDescription" runat="server" Text='<%# Eval("description") %>'></asp:Literal></p>
    <h2><asp:Label ID="lblAdmissionHdr" runat="server" Text="Admission"></asp:Label></h2>
    <p><asp:Literal ID="litAdmission" runat="server" Text='<%# Eval("admission") %>'></asp:Literal></p>
    <h2><asp:Label ID="lblStandardsHdr" runat="server" Text="Standards"></asp:Label></h2>
    <p><asp:Literal ID="litStandards" runat="server" Text='<%# Eval("standards") %>'></asp:Literal></p>
    <h2><asp:Label ID="lblAdvisingHdr" runat="server" Text="Advising"></asp:Label></h2>
    <p><asp:Literal ID="litAdvising" runat="server" Text='<%# Eval("advising") %>'></asp:Literal></p>
    <h2><asp:Label ID="lblPrerequisitesHdr" runat="server" Text="Prerequisites"></asp:Label></h2>
    <p><asp:Literal ID="litPrerequisites" runat="server" Text='<%# Eval("prerequisites") %>'></asp:Literal></p>
    <h2><asp:Label ID="lblRequirementsHdr" runat="server" Text="Requirements"></asp:Label></h2>
    <p><asp:Literal ID="litRequirements" runat="server" Text='<%# Eval("requirements") %>'></asp:Literal></p> 
     <asp:Repeater ID="courseDetail" runat="server" OnItemDatabound="Repeater2_ItemDataBound">
        <HeaderTemplate>
            <table width="95%" cellpadding="3" cellspacing="0" border="0" align="center">
        </HeaderTemplate>
        <ItemTemplate>
            <asp:Literal ID="litCategory" runat="server" Text=""></asp:Literal>
            <asp:Literal ID="litSubcategory" runat="server" Text=""></asp:Literal>
            <tr>
            <td width="5%">&nbsp;</td>
            <td align="left" valign="top" width="15%">
            <asp:Hyperlink ID="hlCourse" runat="server"></asp:Hyperlink>
            </td>
            <td align="left" valign="top" width="70%">
                <asp:Label ID="lblCourseName" runat="server" Text="" Visible="false"></asp:Label>
                <asp:HyperLink ID="hlCourseName" runat="server"></asp:HyperLink></td>
            <td align="left" valign="top" width="10%" nowrap="nowrap">.....<asp:Label ID="lblCredits" runat="server" Text=""></asp:Label></td>
           
        </ItemTemplate>
        <FooterTemplate>
            </table>
        </FooterTemplate>
        </asp:Repeater> 
    <p></p>
    <p><asp:Literal ID="litOther" runat="server" Text='<%# Eval("otherInfo") %>'></asp:Literal></p>
    <h2><asp:Label ID="lblCertificationHdr" runat="server" Text="Certification" Visible="false"></asp:Label></h2>
    <p><asp:Literal ID="litCertification" runat="server" Text='<%# Eval("certification") %>'></asp:Literal></p>
    </ItemTemplate>
    </asp:Repeater>

Open in new window

protected void Repeater1_ItemDataBound(Object Sender, RepeaterItemEventArgs e)
        {
            if (e.Item.ItemType == ListItemType.Item || e.Item.ItemType == ListItemType.AlternatingItem)
            {
                string adm = DataBinder.Eval(e.Item.DataItem, "admission").ToString();
                if ((adm == "") || (adm == null))
                {
                    ((Label)e.Item.FindControl("lblAdmissionHdr")).Visible = false;
                }
                string st = DataBinder.Eval(e.Item.DataItem, "standards").ToString();
                if ((st == "") || (st == null))
                {
                    ((Label)e.Item.FindControl("lblStandardsHdr")).Visible = false;
                }
                string advising = DataBinder.Eval(e.Item.DataItem, "advising").ToString();
                if ((advising == "") || (advising == null))
                {
                    ((Label)e.Item.FindControl("lblAdvisingHdr")).Visible = false;
                }
                string prereq = DataBinder.Eval(e.Item.DataItem, "prerequisites").ToString();
                if ((prereq == "") || (prereq == null))
                {
                    ((Label)e.Item.FindControl("lblPrerequisitesHdr")).Visible = false;
                }
                string req = DataBinder.Eval(e.Item.DataItem, "requirements").ToString();
                if ((req == "") || (req == null))
                {
                    ((Label)e.Item.FindControl("lblRequirementsHdr")).Visible = false;
                }
                string cert = DataBinder.Eval(e.Item.DataItem, "certification").ToString();
                if ((cert == "") || (cert == null))
                {
                    ((Label)e.Item.FindControl("lblCertificationHdr")).Visible = false;
                }
            }
        }
        protected void Repeater2_ItemDataBound(Object Sender, RepeaterItemEventArgs e)
        {
            string degreeID = DataBinder.Eval(e.Item.DataItem, "ID").ToString();

            string connStr = ConfigurationManager.ConnectionStrings["ruUtility"].ToString();
            SqlConnection conn = new SqlConnection(connStr);
            SqlCommand cmd = new SqlCommand("sp_courseRecords", conn);
            cmd.CommandType = CommandType.StoredProcedure;
            cmd.Parameters.AddWithValue("@ID", degreeID);

            conn.Open();
            SqlDataReader reader = cmd.ExecuteReader();

            Repeater cd = ((Repeater)e.Item.FindControl("courseDetail"));
            cd.DataSource = reader;

            //cd.DataBind();

            /* Course data returned:
             * subjectID, courseNumber, courseName, credits, category, subcategory */

            while (reader.Read())
            {
                string category = reader["category"].ToString();
                string subcat = reader["subcategory"].ToString();
                //set up counter
                //if counter = 0 then move category/subcategory into session
                //check for equality between session & reader for cat & subcat
                //if unequal, move new value into session

                // CATEGORY HEADING
                if ((category == "") || (category == "0"))
                {
                    ((Literal)e.Item.FindControl("litCategory")).Visible = false;
                }
                else
                {
                    ((Literal)e.Item.FindControl("litCategory")).Visible = true;
                    ((Literal)e.Item.FindControl("litCategory")).Text = "<tr><td colspan='4' align='left'><h2>" +
                        category + "</h2></td></tr>";
                }
                // SUBCATEGORY HEADING
                if ((subcat == "") || (subcat == "0"))
                {
                    ((Literal)e.Item.FindControl("litSubcategory")).Visible = false;
                }
                else
                {
                    ((Literal)e.Item.FindControl("litSubcategory")).Visible = true;
                    ((Literal)e.Item.FindControl("litSubcategory")).Text = "<tr><td width='5%'>&nbsp;</td><td colspan='3' align='left'><h3><i>" +
                       subcat + "</i></h3></td></tr>";
                }
                // COURSE ROWS
                string subj = reader["subjectID"].ToString();
                string course = reader["courseNumber"].ToString();
                string cname = reader["courseName"].ToString();
                string credits = reader["credits"].ToString();

                if ((subj == "") || (subj == "0") || (course == "") || (course == "0"))
                {
                    ((HyperLink)e.Item.FindControl("hlCourse")).Visible = false;
                    ((HyperLink)e.Item.FindControl("hlCourseName")).Visible = false;
                    // No link, just course name
                    ((Label)e.Item.FindControl("lblCourseName")).Text = cname;
                    ((Label)e.Item.FindControl("lblCourseName")).Visible = true;
                }
                else
                {
                    // Show linked subject & course
                    ((HyperLink)e.Item.FindControl("hlCourse")).Text = subj + " " + course;
                    ((HyperLink)e.Item.FindControl("hlCourse")).NavigateUrl =
                        Session["path"] + "Course.aspx?subj=" + subj + "&num=" + course;
                    ((HyperLink)e.Item.FindControl("hlCourse")).Visible = true;
                    // Hide unlinked course name
                    ((Label)e.Item.FindControl("lblCourseName")).Visible = false;
                }
                if ((cname == "") || (cname == "0"))
                {
                    ((HyperLink)e.Item.FindControl("hlCourseName")).Visible = false;
                }
                else
                {
                    // Show linked course name
                    ((HyperLink)e.Item.FindControl("hlCourseName")).Text = cname;
                    ((HyperLink)e.Item.FindControl("hlCourseName")).Visible = true;
                    ((HyperLink)e.Item.FindControl("hlCourseName")).NavigateUrl =
                        Session["path"] + "Course.aspx?subj=" + subj + "&num=" + course;
                }

                if ((credits == "") || (credits == "0"))
                {
                    ((Label)e.Item.FindControl("lblCredits")).Visible = false;
                }
                else
                {
                    ((Label)e.Item.FindControl("lblCredits")).Visible = true;
                    ((Label)e.Item.FindControl("lblCredits")).Text = credits;
                }

            }
            reader.Close();
            conn.Close();
        }

Open in new window

0
Comment
Question by:vcbertini
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 6
  • 6
12 Comments
 
LVL 11

Accepted Solution

by:
jasonduan earned 1500 total points
ID: 34240269
Inside Repeater1_ItemDataBound, set the datasource for courseDetail repeater:
   
     ... code to get data for repeater ...
     ...............................................
     Repeater cd = ((Repeater)e.Item.FindControl("courseDetail"));
     cd.DataSource = reader;
     cd.DataBind();
 
Inside Repeater2_ItemDataBound(), remove the code that moved to Repeater1_ItemDataBound()
0
 
LVL 11

Expert Comment

by:jasonduan
ID: 34240289
The bottom line is that if there is no datasouce bound, the event ItemDataBound is not fired. Therefore, you cannot set a repeater's datasouce inside its own ItemDataBound event handler.
0
 

Author Comment

by:vcbertini
ID: 34240302
If I move the reader into Repeater1_ItemDataBound, then it is not recognized in Repeater2_ItemDataBound
0
Concerto's Cloud Advisory Services

Want to avoid the missteps to gaining all the benefits of the cloud? Learn more about the different assessment options from our Cloud Advisory team.

 
LVL 11

Expert Comment

by:jasonduan
ID: 34240326
do not use reader, use datatable instead.
0
 
LVL 11

Expert Comment

by:jasonduan
ID: 34240342
the reason being datareader is an "active" connection to database, the datatable or dataset is in disconnected mode.
0
 

Author Comment

by:vcbertini
ID: 34240536
Ok. I can try that - not sure how to create a data table (still new at C#, but will look that up). How do you bind the repeater to the data table?
0
 

Author Comment

by:vcbertini
ID: 34240670
Oops, not the repeater, I mean, how do you the data table with the data from the database? Do you have to use a reader for that?
0
 

Author Comment

by:vcbertini
ID: 34240681
Man, I gotta lay off the cold medicine. "how do you FILL the data table with the data from the database? Do you have to use a reader for that? "
0
 
LVL 11

Assisted Solution

by:jasonduan
jasonduan earned 1500 total points
ID: 34240795
0
 

Author Comment

by:vcbertini
ID: 34241347
I think I have just programmed myself into a corner. I can't figure out how to get the data out of my table.  I populated the table with the reader (couldn't figure out how to use the adapter), and now I can't figure out, no matter how much I read, how to pull the data out.  Everyone in every article, website, forum, etc. seems to have their own method of doing things, binding to grids, etc. and it doesn't seem to apply to what I'm trying to do.  Whatever I try is not finding the table name outside of the function it was created in.
protected void Repeater2_ItemDataBound(Object Sender, RepeaterItemEventArgs e)
        {
            /* Course data returned:
             * subjectID, courseNumber, courseName, credits, category, subcategory */

            for (DataRow row.Read())
            {
//no idea what to put here
}

Open in new window

string connStr = ConfigurationManager.ConnectionStrings["ruUtility"].ToString();
                SqlConnection conn = new SqlConnection(connStr);
                SqlCommand cmd = new SqlCommand("sp_courseRecords", conn);
                cmd.Parameters.AddWithValue("@ID", degreeID);

                conn.Open();
                SqlDataReader reader = cmd.ExecuteReader()

                DataTable myTable = new DataTable();
                while(reader.Read())
                {
                    DataRow row;
                    row = myTable.NewRow();

                    row["subjectID"] = reader["subjectID"].ToString();
                    row["courseNumber"] = reader["courseNumber"].ToString();
                    row["courseName"] = reader["courseName"];
                    row["credits"] = reader["credits"];
                    row["category"] = reader["category"];
                    row["subcategory"] = reader["subcategory"];

                    myTable.Rows.Add(row);    
                }

                Repeater cd = ((Repeater)e.Item.FindControl("courseDetail"));
                cd.DataSource = myTable;
                cd.DataBind();

                reader.Close();
                conn.Close();

Open in new window

0
 
LVL 11

Expert Comment

by:jasonduan
ID: 34242226
I suggest you isolate the issues and resolve them one by one.
It would be easier for you to simply create a "fake" data table with a few sample rows to make the repeater work. Once the repeater is working, you can focus on how to populate the data table.
It is very.
Keep it cool and stay focus, you'll get it working.
0
 

Author Closing Comment

by:vcbertini
ID: 34242331
Still trying to figure it out, but closer.
0

Featured Post

VIDEO: THE CONCERTO CLOUD FOR HEALTHCARE

Modern healthcare requires a modern cloud. View this brief video to understand how the Concerto Cloud for Healthcare can help your organization.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Just a quick little trick I learned recently.  Now that I'm using jQuery with abandon in my asp.net applications, I have grown tired of the following syntax:      (CODE) I suppose it just offends my sense of decency to put inline VBScript on a…
Introduction Hi all and welcome to my first article on Experts Exchange. A while ago, someone asked me if i could do some tutorials on object oriented programming. I decided to do them on C#. Now you may ask me, why's that? Well, one of the re…
Visualize your data even better in Access queries. Given a date and a value, this lesson shows how to compare that value with the previous value, calculate the difference, and display a circle if the value is the same, an up triangle if it increased…
Please read the paragraph below before following the instructions in the video — there are important caveats in the paragraph that I did not mention in the video. If your PaperPort 12 or PaperPort 14 is failing to start, or crashing, or hanging, …

610 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question