Chrome Desktop Notification for Django

[Max Nathaniel Ho]

I found this excellent example on Chrome Desktop Notification - Chrome desktop notification example?

I am able to create the Desktop Notification by clicking a button. 

However, that is pretty front-end. 

I would like to find out how to link an event in the web app. For example,  the event could be someone posting a job for a freelance work. And user who is logged into the web app but not actively browsing on the web page will be notified via the Chrome Desktop Notification. 

Are there any examples of how I can create a Event Handler to listen to data in the backend, and prompt the user via the Desktop Notification?

Many thanks!

[Collin Anderson]

Hello,

From a front-end standpoint, I personally like EventSource for this, though you could also use websockets or polling (checking every few minutes/seconds).

https://developer.mozilla.org/en-US/docs/Web/API/EventSource

http://en.wikipedia.org/wiki/Server-sent_events

Collin

[Max Nathaniel Ho]

HI Collin,

Thanks for pointing that out. Apart from the documentation, do you have any examples of how to implement it?

Thank you.

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Regards,
Max Nathaniel Ho.

[Collin Anderson]

Hello,

The frontend part is simple:

var myEventSource = new EventSource('/path/to/eventsource/');
myEventSource.onmessage = function(e) {
  console.log(e.data)
}

The backend part is where things get complicated (untested code, as always :)

def eventsource(request):
    last_id = request.META.get('HTTP_LAST_EVENT_ID')
    id, data = get_new_data()  # somehow wait for some new data, and timeout after 10-50 seconds.
    if not data:
      return HttpResponse('', content_type='text/event-stream')
    assert '\n\n' not in data, 'two line breaks in a row signifies an end of message'
    return HttpResponse('id: %s\ndata: %s' % (id, data), content_type='text/event-stream')

Collin