Call a Web service to get the search result while using search Bar

I have implemented a tableView with a searchBar added to it. I want to call a service when user start typing the search keyword in the search bar. I know that I can call the service in the change event listener that will call the service.

The problem I am facing is that for every change in the search bar It is not good to call a service. So what is the efficient approach of using search bar when the search result is coming from a service call or what we can do to make the search efficient.

For example: the search functionality on Apple's App store

Ajeet,

Try to call webservice in return event listener like..

var search = Titanium.UI.createSearchBar({
    top : 0,
    height : 44,
    hintText : "Search",
    barColor : '#dedede',
 
});
win.add(search);
 
search.addEventListener('return', function(e) {
    // function()
});