Hi Lina,
Please try the following code snippet to set the TextBox text.
JS:
function
txtName_Blur(sender, eventArgs) {
var
txtProductSiteNumber = $find(
"<%=txtProductSiteNumber.ClientID %>"
);
var
name = sender._value;
//Get the TextBox value
txtProductSiteNumber.set_value(name);
//Set the next TextBox value
}
Thanks,
Princy