i wrote Javascript that copies the data from textbox to the clipboard:

TextBox:

<asp:TextBox ID=contNoTxtBox runat=server Width=182px style=height: 22px></asp:TextBox>

Javascript:

function CopyToClipBoard()

{

    var text = document.getElementById('contNoTxtBox').innerHTML;                       

    window.clipboardData.setData('Text', text);                       

}

and i call it in HTML button the following way:

<input id=CopyButton type=button value=Copy onclick=CopyToClipBoard() /><br />

However i get the following error:

Uncaught TypeError: Cannot read property 'setData' of undefined

Why am i getting this type pf error?