Powershell Asynchronous Download String

WebClient DownloadStringAsync
Powershell Register-ObjectEvent
PSEventArgs Properties

# - get webclient
$webClient = new-object net.webclient

# - register event handler for DownloadStringCompleted event
#   action script block is event handler code, show string DownloadStringCompletedEventArgs.Result
register-objectEvent $webClient downloadStringCompleted e1 {write-host $args[1].result}  #positional input params

# - begin asynchronous download string
#   event handlers will execute when download is complete
$webClient.downloadStringAsync("http://www.expressionsoftware.com")

# - list event subscriptions
get-eventSubscriber  #output #SubscriptionId  : 1
                             #SourceObject    : System.Net.WebClient
                             #EventName       : downloadStringCompleted
                             #SourceIdentifier: e1
                             #Action          : System.Management.Automation.PSEventJob
                             #SupportEvent    : False
                             #ForwardEvent    : False
                             #HandlerDelegate :

# - list jobs
get-job | fl  #output  #Id           : 1
                       #Name         : e1
                       #Command      : write-host $args[1].result
                       #State        : Running
                       #JobStateInfo : Running
                       #HasMoreData  : True
                       #Finished     : System.Threading.ManualResetEvent
                       #InstanceId   : 010f31f4-e8d2-4742-a782-79057faefebf
                       #Module       : __DynamicModule_a48149c1-5a56-4172-bc68-473ec7c83119
                       #StatusMessage:   #Location
                       #ChildJobs    : {}  #Output, Error, Progress, Verbose, Debug, Warning

# - register another handler, multiple event handlers supported, named input params
register-objectEvent -inputObject $webClient `
                     -eventName downloadStringCompleted `
                     -sourceIdentifier e2 `
                     -action {write-host ("async event at {0}`nevent handler source identifier: {1}`n{2}" -f ($event.timeGenerated.tostring("HH:mm:ss")), $event.sourceIdentifier, $args[1].result)}

# - unregister events
unregister-event -subscriptionId 1
unregister-event -sourceIdentifier e2
get-eventsubscriber -force | unregister-event -force  #unregister all events

# - synchronous download string
$webClient.downloadString("http://www.expressionsoftware.com")

Powershell asynchronous download file with WebClient DownloadFileAsync

Using External JavaScript Files with Google Analytics

For basic page tracking, put the code in an external file.

Then you can use this

<script src="/js/googleAnalytics.js" type="text/javascript"></script>

instead of

<script type="text/javascript">
  var _gaq = _gaq || [];
  _gaq.push(['_setAccount', 'UA-XXXXX-X']);
  _gaq.push(['_trackPageview']);
  (function() {
    var ga = document.createElement('script'); ga.type = 'text/javascript'; ga.async = true;
    ga.src = ('https:' == document.location.protocol ? 'https://ssl' : 'http://www') + '.google-analytics.com/ga.js';
    var s = document.getElementsByTagName('script')[0]; s.parentNode.insertBefore(ga, s);
  })();
</script>

Add to files, right before the closing head tag.


googleAnalytics.js

var _gaq = _gaq || [];
_gaq.push(['_setAccount', 'UA-XXXXX-X']);
_gaq.push(['_trackPageview']);
(function() {
  var ga = document.createElement('script'); ga.type = 'text/javascript'; ga.async = true;
  ga.src = ('https:' == document.location.protocol ? 'https://ssl' : 'http://www') + '.google-analytics.com/ga.js';
  var s = document.getElementsByTagName('script')[0]; s.parentNode.insertBefore(ga, s);
})();