<asp:TextBox ID="txt" runat="server" Width="100px" onkeyup='Cal(this)' ></asp:TextBox> function Cal(tb) { var b = parseFloat(tb.value); var par = tb.parentElement || tb.parentNode; var a = parseFloat(par.previousSibling.getElementsByTagName("span")[0].innerHTML); var tbC = par.nextSibling.getElementsByTagName("input")[0]; tbC.value = a * b; }
function Cal(tb) {
var b = parseFloat(tb.value);
var par = tb.parentElement || tb.parentNode;
var a = parseFloat(par.previousSibling.getElementsByTagName("span")[0].innerHTML);
var tbC = par.nextSibling.getElementsByTagName("input")[0];
tbC.value = a * b;
}