why?

[Charlos]

If i do this

<input type="text" id="tt" value="<%=server.HTMLEncode("&")%>">

i see & but if i do this


document.getElementById("tt").value="<%=server.HTMLEncode("&")%>";


I obtain &amp;amp; and not &

[CardboardHammer]

Because in the first one you're writing HTML to a place HTML belongs and in the second one, you're assigning HTML to where a plaintext string is expected on the clientside.

Look at your page source. You assigned "&amp;amp;" with the script and that's exactly what you got. I imagine there's some function in javascript to decode, so you'd need to use it when doing the assignment.