Get GridView selected row DataKey in Javascript

Question

I have GridView which I can select a row. I then have a button above the grid called Edit which the user can click to popup a window and edit the selected row. So the button will have Javascript code behind it along the lines of

function editRecord()
{
  var gridView = document.getElementById("<%= GridView.ClientID %>");
  var id = // somehow get the id here ???
  window.open("edit.aspx?id=" + id);
}

The question is how do I retrieve the selected records ID in javascript?

Answer 1

I worked it out based on JasonS response. What I did was create a hidden field in the Grid View like this:

<asp:TemplateField ShowHeader="False">
    <ItemTemplate>
      <asp:HiddenField ID="hdID" runat="server" Value='<%# Eval("JobID") %>' />
    </ItemTemplate>
</asp:TemplateField>
<asp:TemplateField Visible="False">
    <ItemTemplate>
      <asp:LinkButton ID="lnkSelect" runat="server" CommandName="select" Text="Select" />
    </ItemTemplate>
</asp:TemplateField>

Then on the OnRowDataBind have code to set the selected row

protected virtual void Grid_RowDataBound(object sender, GridViewRowEventArgs e)
{
    if (e.Row.RowType == DataControlRowType.DataRow)
    {
        // Click to highlight row
        Control lnkSelect = e.Row.FindControl("lnkSelect");
        if (lnkSelect != null)
        {
            StringBuilder click = new StringBuilder();
            click.AppendLine(m_View.Page.ClientScript.GetPostBackClientHyperlink(lnkSelect, String.Empty));
            click.AppendLine(String.Format("onGridViewRowSelected('{0}')", e.Row.RowIndex));
            e.Row.Attributes.Add("onclick", click.ToString());
        }
    }            
}

And then in the Javascript I have code like this

<script type="text/javascript">

var selectedRowIndex = null;

function onGridViewRowSelected(rowIndex)
{        
    selectedRowIndex = rowIndex;
}

function editItem()
{   
    if (selectedRowIndex == null) return;

    var gridView = document.getElementById('<%= GridView1.ClientID %>');                
    var cell = gridView.rows[parseInt(selectedRowIndex)+1].cells[0];        
    var hidID = cell.childNodes[0];        
    window.open('JobTypeEdit.aspx?id=' + hidID.value);
}

</script> 

Works a treat :-)

Answer 2

1) change your javascript function to use a parameter

function editRecord(clientId)
{ ....

2) output the call in your editRecord button... if you want to avoid dealing with the .net generated ids, just use a simple

<input type="button" onclick="editRecord(your-rows-client-id-goes-here)" />

Answer 3

Based off of your comments to @DaveK's response, in javascript you can set the id of a hidden field to the clientId of the selected row when the user selects it. Then have your editRecord function use the value set on the hidden form field.

Answer 4

one could avoid javascript altogether, by setting anchor tags pre-populated with the query string for each row (although this will effect your table layout, it will need only one click rather than 2 from the user)

insert in the gridview template:

<asp:HyperLink runat="server" ID="editLink" Target="_blank"
   NavigateURL='<%# Eval("JobID","edit.aspx?id={0}") %>'> 
     Edit..
</asp:HyperLink>