Can I make any ASP.NET/HTML element into form-data that posts back to the server?

Question

I am using Javascript to alter the innerHTML attribute of a <td> and I need to get that info back in the form submittal. The <td> corrosponds to an <asp:TableCell> on the server-side, where the Text attribute is set to an initial value.

The user cannot enter the value in this particular field. Instead, its value is set by me (via client-side script) based on actions that the user performs. But this field is useless to me if I can't see its value on the server-side as well.

I'd like to avoid using a read-only textbox, because those are difficult to resize dynamically. Can an <asp:Label> be used as form data? Is there any way to achive this without letting the user manually enter the data? Or is there a simpler way to store a string as a variable somewhere and send it back as form-data?

Answer 1

Add <input type="hidden" runat="server" id="myTDvalue"> to your form. Set that value via clientside script. Read it on the postback.

Answer 2

You can only read data entered by user in any of html input elemnets, whatever you user sets them manually or you do it via javascript. You can use <asp:HiddenField runat="server" ID="somId" /> and set its value according to user actions on page.