how to get dynamically created checkbox row value in gridview using javascript

Question

I have created a grid view with multiple dynamically generated check boxes but all of the check boxes have same id. How can I get row value of the selected check box?

here is my dyanamic control at gridvie rowdatabound event

protected void grdreport_RowDataBound(object sender, GridViewRowEventArgs e)
{
    int temp = e.Row.Cells.Count;

    temp--;

    if (e.Row.RowType == DataControlRowType.DataRow)
    {
        if (temp >= 3)
        {
            strheadertext1 = grdreport.HeaderRow.Cells[3].Text;

            CheckBox cb1 = new CheckBox();
            cb1.ID = "cb1";
            cb1.Text = e.Row.Cells[3].Text;

            e.Row.Cells[3].Controls.Add(cb1);
        }
    }
}

and i am getting value on button click

protected void BtnSave_Click(object sender, EventArgs e)
{
    foreach (GridViewRow row in grdreport.Rows)
    {
        CheckBox checkbox1 = (CheckBox)row.FindControl("cb1");
        checkbox1.Checked = true;

        if (checkbox1.Checked)
        {
            string itemname = row.Cells[0].Text;
            string particular = row.Cells[1].Text;
            string qty = row.Cells[2].Text;
        }
    }
}

but when i am getting value it gives me first row value whenever i check second row checkbox

Answer 1

You are hardcoding you ids. Do something like this:

//(or take the count of something else if this is not suitable)
int i = e.Row.Cells[3].Controls.count + 1;
CheckBox cb1 = new CheckBox();
cb1.ID = "cb" + i;

To find the element in JavaScript:

var checkbox = document.getElementById("checkboxid");

Answer 2

You are looping all the rows, but never store values outside the loop, so the values will always be of the last checkbox checked. Take a look at the following snippet and the values written to Label1 . Those will be the values per row.

protected void BtnSave_Click(object sender, EventArgs e)
{
    for (int i = 0; i < grdreport.Rows.Count; i++)
    {
        GridViewRow row = grdreport.Rows[i];

        CheckBox checkbox1 = (CheckBox)row.FindControl("cb1");
        if (checkbox1.Checked)
        {
            Label1.Text += string.Format("Row {0}: {1}<br>", i, row.Cells[1].Text);
        }
    }
}