Please tell how to generate dynamic rows in using HTML tags and prevent postback

Question

0.00/5 (No votes)

See more:

This is my button click code:

C#

protected void btnAddOwner_Click(object sender, EventArgs e)
    {
        if (ValidateTableData(tblPartner, "Javascript:alert('First enter all row(s) data!')"))
        {
            if (ViewState["DelayID"] == null) ViewState["DelayID"] = 0;
            AddPartnerRow(1, true);
            ViewState["DelayID"] = Convert.ToInt32(ViewState["DelayID"]) + 1;
            // Clearfield();
      
        }
    }

This is the function that I am using to generate the dynamic rows through code but when postback happens in case of using dropdown it removes all the rows and reaches to the default that I made in designing:

C#

    protected void AddPartnerRow(int rowCount, bool isNew)
    {
        int i = 0;
        if (isNew) { i = Convert.ToInt32(ViewState["DelayID"]);
        rowCount = Convert.ToInt32(ViewState["DelayID"]) + 1;
        }

        for (i=1; i < rowCount; i++)
        {
            TableRow Row = new TableRow();

            TableCell CellSNo = new TableCell();
            CellSNo.Text = tblPartner.Rows.Count.ToString();
            CellSNo.HorizontalAlign = HorizontalAlign.Center;
            CellSNo.VerticalAlign = VerticalAlign.Middle;
            CellSNo.CssClass = "lab_row";

            TableCell CellStartTime = new TableCell();
            CellStartTime.HorizontalAlign = HorizontalAlign.Center;
            CellStartTime.VerticalAlign = VerticalAlign.Middle;
            CellStartTime.CssClass = "lab_row";

            TableCell CellEndTime = new TableCell();
            CellEndTime.HorizontalAlign = HorizontalAlign.Center;
            CellEndTime.VerticalAlign = VerticalAlign.Middle;
            CellEndTime.CssClass = "lab_row";

            TableCell CellProject = new TableCell();
            CellProject.HorizontalAlign = HorizontalAlign.Center;
            CellProject.VerticalAlign = VerticalAlign.Middle;
            CellProject.CssClass = "lab_row";
           
            TableCell CellModule = new TableCell();
            CellModule.HorizontalAlign = HorizontalAlign.Center;
            CellModule.VerticalAlign = VerticalAlign.Middle;
            CellModule.CssClass = "lab_row";

            TableCell CellTask = new TableCell();
            CellTask.HorizontalAlign = HorizontalAlign.Center;
            CellTask.VerticalAlign = VerticalAlign.Middle;
            CellTask.CssClass = "lab_row";

            TableCell CellWorktype = new TableCell();
            CellWorktype.HorizontalAlign = HorizontalAlign.Center;
            CellWorktype.VerticalAlign = VerticalAlign.Middle;
            CellWorktype.CssClass = "lab_row";

            TableCell CellStatus = new TableCell();
            CellStatus.HorizontalAlign = HorizontalAlign.Center;
            CellStatus.VerticalAlign = VerticalAlign.Middle;
            CellStatus.CssClass = "lab_row";

            TableCell CellRemarks = new TableCell();
            CellRemarks.HorizontalAlign = HorizontalAlign.Center;
            CellRemarks.VerticalAlign = VerticalAlign.Middle;
            CellRemarks.CssClass = "lab_row";

            TextBox txtStartTime = new TextBox();
            txtStartTime.ID = "txtStartTime" + Convert.ToString(i + 4);//ControlsList.Count.ToString();// NextID("txtPartnerName");
            CellStartTime.Controls.Add(txtStartTime);
            txtStartTime.Width = 60;

            TextBox txtEndTime = new TextBox();
            txtEndTime.ID = "txtEndTime" + Convert.ToString(i + 4);//ControlsList.Count.ToString();// NextID("txtPartnerName");
            CellEndTime.Controls.Add(txtEndTime);
            txtEndTime.Width = 60;

            DropDownList ddlProject = new DropDownList();
            ddlProject.ID = "ddlProject" + Convert.ToString(i + 4); //NextID("txtPartnerAddress");
            CellProject.Controls.Add(ddlProject);
            ddlProject.AutoPostBack = true;
            ddlProject.Width = 70;
            ddlProject.SelectedValue.ToString();
            ddlProject.Text="";
            ddlProject.DataTextField="ProjectABR";
            ddlProject.DataValueField = "ProjectId";
            

            DropDownList ddlModule = new DropDownList();
            ddlModule.ID = "ddlModule" + Convert.ToString(i + 4); //NextID("txtPartnerPost");
            CellModule.Controls.Add(ddlModule);
            ddlModule.AutoPostBack = true;
            ddlModule.Width = 70;
            
            DropDownList ddlTask = new DropDownList();
            ddlTask.ID = "ddlTask" + Convert.ToString(i + 4); //NextID("txtPartnerPost");
            CellTask.Controls.Add(ddlTask);
            ddlTask.AutoPostBack = true;
            ddlTask.Width = 70;

            TextBox txtWorkType = new TextBox();
            txtWorkType.ID = "txtWorkType" + Convert.ToString(i + 4);//ControlsList.Count.ToString();// NextID("txtPartnerName");
            CellWorktype.Controls.Add(txtWorkType);
            txtWorkType.Width = 60;

            DropDownList ddlStatus = new DropDownList();
            ddlStatus.ID = "ddlStatus" + Convert.ToString(i + 4); //NextID("txtPartnerPost");
            CellStatus.Controls.Add(ddlStatus);
            ddlStatus.Width = 70;

            TextBox txtRemarks = new TextBox();
            txtRemarks.ID = "txtRemarks" + Convert.ToString(i + 4);//ControlsList.Count.ToString();// NextID("txtPartnerName");
            CellRemarks.Controls.Add(txtRemarks);
            txtRemarks.TextMode = TextBoxMode.MultiLine;
            txtRemarks.Width = 90;
            
            Row.Cells.Add(CellSNo);
            Row.Cells.Add(CellStartTime);
            Row.Cells.Add(CellEndTime);
            Row.Cells.Add(CellProject);
            Row.Cells.Add(CellModule);
            Row.Cells.Add(CellTask);
            Row.Cells.Add(CellWorktype);
            Row.Cells.Add(CellStatus);
            Row.Cells.Add(CellRemarks);
            tblPartner.Rows.Add(Row);
//another function
 protected bool ValidateTableData(Table tbl, string Message)
    {
        bool res = false;
        StringBuilder sb = new StringBuilder();
        foreach (Control tr in tbl.Rows)
        {
            if (!(tr is TableHeaderRow))
            {
                foreach (Control cell in tr.Controls)
                {
                    if (cell is TableCell)
                    {
                        foreach (Control ctl in cell.Controls)
                        {
                            if (ctl is TextBox)
                            {
                                TextBox txtValue = ctl as TextBox;
                                if (ctl != null)
                                {
                                    //if(txt.ID.StartsWith())
                                    sb.Append(txtValue.Text + "#");
                                }
                            }
                        }
                    }
                }
                string tmp = sb.ToString();
                if (tmp.Replace("#", "").Length < 1)
                    Response.Write(Message);
                else
                    res = true;
            }
        }
        return res;
    }

And when I generate rows the default rows dropdown connect to database the newly generated row dropdown won't able to connect to backend

Please help to check and tell me the right answer please please help me

Posted 7-Nov-11 23:44pm

Prashant Srivastava LKO

Updated 7-Nov-11 23:48pm

Smithers-Jones

v2

Add a Solution

Comments

Smithers-Jones 8-Nov-11 5:49am

Added code-block.

1 solution

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

Not Active · Answer 1 · 2011-11-08T02:35:00

As with any dynamically create controls in ASP.NET they must be recreated at postback.

You could use a DataList or Repeater control and bind it to some data source, then when needed a new row you add it to the data source and let the ASP.NET rendering handle creating the actual row elements.

If there is no data a simpler way to add a new row to the DOM would be to use JavaScript and clone an existing one and insert it

<table>
   <tr id='example'>
      <td>Something...</td>
   </tr>
</table>

var newRow = $("#example").clone();
$("#example").after(newRow);