How can I trigger the client side function on value change?

You can set the ClientSideOnValueChange property to the name of the client side function to be triggered on changing some value.

C#

< ssw:CurrencyTextBox ID="CurrencyTextBox1" runat="server" ClientSideOnValueChange="OnValueChange(this)" />

C#

function OnValueChange( obj )

{

alert(obj["Value"]);

}