RIA/JS: Deleting Entities

I got an e-mail from somebody who had watched the first few screencasts and wanted to know about deletes. Seemed like a good topic for our next screencast so here it is: Deleting with client-side change tracking:

Here’s the source as it’s entered into the console (plus the part that creates the array and datasource that I embed in the page).

var contacts = [];
 
var ds = $([contacts]).dataSource({
  serviceUrl: '/RiaJs-Demo1-ContactService.svc',   
  queryName: 'GetContacts',   
  bufferChanges: true
});
 
ds.refresh();

contacts.deleteEntity(contacts[1]);

// should output "ClientDeleted"
ds.getEntityState(contacts[1]); 
// deletes from the DB 
    
// and removes the item from the array 
  
ds.commitChanges(); 

Next time I hope to start working with some UI!