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Update textbox control in DataGrid using Javascript

I have a Datagrid with controls like textbox, label and dropdownlist. I am trying to update the values in the controls using javascript. I was able to successfully update the Label but I am not able to update or disable the textbox.

When the dropdownlist changes, I need to change the value in the textbox and label. When the checkbox is checked/unchecked I need to enable/ disable the texbox respectively. Below is my datagrid columns and the javascript functions I have till now.

<Columns>
                                                <asp:TemplateColumn HeaderText="Select" ItemStyle-Width="10">
                                                      <ItemTemplate>
                                                            <asp:CheckBox ID="chkDiscount" Runat="server" CssClass="small" onclick="javascript:chkDiscount(this);"></asp:CheckBox>
                                                      </ItemTemplate>
                                                </asp:TemplateColumn>
                                                <asp:BoundColumn DataField="mtgTypeDesc" HeaderText="Course Type">
                                                      <ItemStyle Width="120px" CssClass="styleyellow"></ItemStyle>
                                                </asp:BoundColumn>
                                                <asp:TemplateColumn HeaderText="Discount Type">
                                                      <ItemStyle Width="100px" CssClass="styleyellow"></ItemStyle>
                                                      <ItemTemplate>
                                                            <asp:DropDownList id="ddListDisctype" runat="server" Width="100px" onchange="javascript:discTypeChange(this);">
                                                                  <asp:ListItem Value="1" Selected="True">By Price</asp:ListItem>
                                                                  <asp:ListItem Value="2">By Percent</asp:ListItem>
                                                            </asp:DropDownList>
                                                      </ItemTemplate>
                                                </asp:TemplateColumn>
                                                <asp:TemplateColumn HeaderText="Discount <br>Price/ % Off">
                                                      <ItemStyle Width="30px" CssClass="stylewhite" HorizontalAlign="Right"></ItemStyle>
                                                      <ItemTemplate>
                                                            <asp:TextBox Runat="server" ID="txtboxDiscount" Width="50px" Text='<%#DataBinder.Eval(Container.DataItem,"price")%>' />
                                                      </ItemTemplate>
                                                </asp:TemplateColumn>
                                                <asp:TemplateColumn HeaderText="USD or %">
                                                      <ItemStyle Width="25px" CssClass="stylewhite"></ItemStyle>
                                                      <ItemTemplate>
                                                            <asp:Label id="lblUnit" runat="server" Width="25px"></asp:Label>
                                                      </ItemTemplate>
                                                </asp:TemplateColumn>
                                          </Columns>

Javascript
------------------

function discTypeChange(elmCurrent)
                  {
                  var currVal = new String(elmCurrent.value);
                        var row = elmCurrent.parentElement.parentElement;
                        var cellUnit = row.cells[4];
                        var cellPrice = row.cells[7];
                        if(currVal==1){
                              cellUnit.innerHTML = "USD";            //works
                              row.cells[3].childNodes[0].value = cellPrice.innerHTML; //does not work
                        }
                        else{
                              cellUnit.innerHTML = "%";            //works
                              row.cells[3].childNodes[0].value = "0"; //works
                        }
                  }

                  function chkDiscount(elmCurrent)
                  {
                  var row = elmCurrent.parentElement.parentElement;
                  if (elmCurrent.checked == true){
                        alert('checked');
                        row.cells[3].childNodes[0].enabled = false; //does not work
                        }
                  }

leakim971

do right click on the page in your web browser, choose view source and post it here

Angel02

ASKER

Please find the view source attached. Please let me know if you don't find what you are looking for.
Page1.txt

leakim971

Thanks.
.Net put the textbox (input) inside a span so you need :
var row = elmCurrent.parentElement.parentElement.parentElement;
instead :
var row = elmCurrent.parentElement.parentElement;

Test page : http://jsfiddle.net/HybyR/2/

You can see an other way to get the second input (index is 1 because first index is 0) inside the row

Angel02

ASKER

Thank you leakim971! This works.
I redefined the row with an additional parentElemnt but I used the cell index in the following function because I needed to access two other controls also. I hope this is OK.

function chkDiscount(elmCurrent)
                  {
                  var row = elmCurrent.parentElement.parentElement.parentElement;
                  var cellPrice = row.cells[6];
                  if (elmCurrent.checked == true){
                   //row.document.getElementsByTagName("input")[1].disabled = false;
                   row.cells[2].disabled = false;
                   row.cells[3].disabled = false;
                   row.cells[5].disabled = false;
                  }
                  else{
                        row.cells[2].disabled = true;
                        row.cells[3].disabled = true;
                        row.cells[5].disabled = true;
                        row.cells[2].childnodes[0].value = "1";
                        row.cells[3].childnodes[0].value = cellprice.innerHTML;
                        row.cells[5].childnodes[0].value = "1";
                        }
                  }

So will .net always add the <span> to the respective control? Is there a way to avoid it?

Also, I would like to keep the corresponding controls disabled when the grid loads. So that when the user checks the row, the controls are enabled only then. Can you please suggest a way of doing it?

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leakim971

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Angel02

ASKER

Works like a charm! Thank you so much.