push notifications API

1-simple.js

var notification = (navigator.notification ||                            
                    navigator.mozNotification ||                         
                    navigator.webkitNotification);                       
if (notification) {                                                      
  // Ask the user to allow notifications.                                                  
  var request = notification.requestRemotePermission();                  
  request.onsuccess = function() {    
    var url = request.result;                                
    console.log('New push URL: ' + url);                                 
    // We got a new push URL, store it on the server.                    
    jQuery.post('/push-urls/', {url: url});                              
  };                                                                     
}

2-careful.js

var notification = (navigator.notification ||                            
                    navigator.mozNotification ||                         
                    navigator.webkitNotification);                       
if (notification) {                                                      
  // Check if we've asked for permission before without bothering the user.
  var check = notification.checkRemotePermission();                      
  check.onsuccess = function() {  
    var url = request.result;                                    
    console.log('Already have a URL: ' + url);                           
  };                                                                     
  check.onerror = function() {                                     
    // Request permission if we haven't been denied before.              
    if (request.error.code != notification.DENIED) {                                              
      var request = notification.requestRemotePermission();              
      request.onsuccess = function() {   
        var url = request.result;                             
        console.log('New push URL: ' + url);                             
        // We got a new push URL, store it on the server.                
        jQuery.post('/push-urls/', {url: url});                          
      };                                                                 
    }                                                                    
  }                                                                      
}