Question

I have sort of a table with a radio-button column. I managed to make radio-button column work dynamically inserting into a cell (div if matter). But, on postback innerHtml hasn’t been updated with “checked” attribute.

Could you give me an idea how can I find out (on the server) if radio-button has been checked?

More info: This is on user control inside update panel.

This would be good post on my topic, still doesn’t help

Answer 1

Any reason you cannot use a standard asp:RadioButton and use javascript to ensure it is mutually exclusive. I have done this before by adding a custom attribute to the radiobutton and then using a js function to uncheck all items with that attribute and then check the selected one. This works around the IE issue which prevents the groupname attribute from working on radioboxes that are in different containers.

radioButton.InputAttributes.Add("ClientGroupName", "grpRadioList");
radioButton.InputAttributes.Add("onclick",
  string.Format(
     "javascript:radiobuttonToggle('{0}','ClientGroupName','grpRadioList');"  
      ,radioButton.ClientID));

and use the following JS to uncheck all radios and then check the one you want.
Note i used InputAttributes instead of Attributes as the radiobutton is wrapped inside a span tag so InputAttributes is for items added to the actual input control rather than the span.

function radiobuttonToggle(selectedRB, attribName, attribValue)
{
    var objRadio = document.getElementById(selectedRB);

    for(i = 0; i < document.forms[0].elements.length; i++)
    {
        elm = document.forms[0].elements[i];
        if (elm.type == 'radio')
        {
            if(elm.getAttribute(attribName) == attribValue)
                elm.checked = false;
        }
    }
    objRadio.checked = true; 
}

You can then expose radioButton.Checked as a property in your CS file and reuse this as a control.