You will have to do this using javascript
on the client side, instead of using a repeater.
I recommend you use jQuery to do this, as well as a very good template plugin: link
You will probably have to get the element that needs to be updated, for example a div
that contains the list of elements you want to update, and append it to insert each new item:
$("#idElementoContainerLista").append(htmlElemento);
Since the variable htmlElemento
can be constructed using a string purely:
"<div>... mais html do elemento aqui...</div>"
Or by using the template plugin ... if the string option starts to get too complicated.