Question

I want to call a javascript function on focus out of asp.net textbox.
I want to do this on client side and not on server side.

Answer 1

<asp:TextBox ID="textbox1" runat="server" onblur="myFunction()" />

However, you should really use a library such as jQuery to attach the events rather than doing them inline:

$('#<%=textbox1.ClientID %>').blur(function() {
     // implementation here
});