Radiobutton changed value doesnt update hiddenfield?

Question

I've got a hidden field in an asp.net gridview like so:

The hidden field is used so that if another field on my gridview is changed I can update the value of this hidden field with the value 1. That way when I click a "Save" button I can loop through the rows of my gridview and only call my database update routine if and only if the hiddenField.Value = "1".

I set this field in the rowdatabound event of the gridview easily with something like this for a textbox:

    HtmlInputHidden hiddenField = (HtmlInputHidden)e.Row.FindControl("hdnIsChanged"); //get handle on hidden row isDirty
    TextBox notes = (TextBox)e.Row.FindControl("txtNotes"); //get notes

//assign onchange / onclick event handlers when something is changed set hidden field to 1
    notes.Attributes.Add("onchange", "document.getElementById('" + hiddenField.ClientID + "').value=1");

This works fine for textboxes and drop downs but I also have a radiobuttonlist in my grid. When I change for instance 3 rows in my gridview by just selecting the radio button, it always ONLY updates 1. It appears the hidden field doesnt get set correctly. I thought I could set it correctly like this:

RadioButtonList rbl = (RadioButtonList)e.Row.FindControl("rbAnswer"); //get answer

                //assign onchange / onclick event handlers when something is changed set hidden field to 1
                  foreach(ListItem li in rbl.Items)
                    li.Attributes.Add("onclick", "document.getElementById('" + hiddenField.ClientID + "').value=1");

This doesn't appear to work and consider clicks for each radio button. As I said if I update three rows by just clicking the radiobutton in each row and then click my save button it only calls the update routine once. It appears the hidden field does not get the value 1.

Can anyone help?

Edit

Just in case here is my entire grid view control:

I even tried some jquery to get an alert:

  $(function () {
            $("#<%=gvLineItems.ClientID %> input[type=radio]").click(function () {
                alert("hi");
            });
        });

But I dont think that is right because when I click a radio button I am not seeing any alert. I also need to update the field hdnIsChanged the hiddenfield with the value 1 when a radio button item from the radiobuttonlist rbAnswer is clicked. I am ok to do this in jquery but could use some help. The hiddenfield hdnIsChanged and the radiobuttonlist rbAnswer are both inside an asp.net gridview.

oJM86o · Accepted Answer

I finally got it thanks to debugging through googles developers tool within the browser. I noticed initially on my page (right click inspect element) every radio button within the radiobuttonlist for each row had an "onclick" attribute..Great so far.

The minute I clicked on a radiobutton, I have "AutoPostBack=true" for my radiobuttonlist, the minute I clicked on it, the only item that had the onclick attribute was for the row I clicked. Every other row the attribute was gone.

The simple solution was in the selectedindexchanged event of the radiobuttonlist to loop through each row in the gridview and readd the attribute.

 foreach (GridViewRow row in gvLineItems.Rows)
            {
               HtmlInputHidden hiddenField = (HtmlInputHidden)row.FindControl("hdnIsChanged");
               RadioButtonList rbl2 = (RadioButtonList)row.FindControl("rbAnswer");

              foreach (ListItem li in rbl2.Items)
               {
                   li.Attributes.Add("onclick", "document.getElementById('" + hiddenField.ClientID + "').value=1");
               }
            }

Radiobutton changed value doesnt update hiddenfield?

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