Plugin onDisplay event

[Zoltan_Kiss]

HI
If my plugin has forexample 5 min polling time, that menas that every time i switch to the page I need to wait while the 5 min elapsed?
How can we (in which event) manualy trigger the http get method, to fill the page and just at that moment start the countdown for next poll?

[bill (Bill Venhaus)]

Decrease the polling interval & add a global variable to your plugin that stores the previous polling time. Then compare the current time with that previous poll time in your polling routine. If the difference is greater than 5 minutes, then actually send your HTTP request.

[bill (Bill Venhaus)]

If you really want to limit your HTTP requests this is another function that can help.

Plugin "HasSubscribers" Function

In the 3.9.0 release a new HasSubscribers function was added to the Device object allowing you to check if it is actively being used on the current page. This means that any Plugins polling HTTP REST APIs can perform conditional checks to see if it needs to send requests. The function accepts an optional Attribute argument in case there is a specific attribute you are targeting. By not providing an argument, it’ll check to see if any attributes are referenced. Attached is a simple example. Tog…

[Zoltan_Kiss]

Hey, thanks for the info…
However, this doesnt work for me…
Is it beacuse I am using pagebrowser?
Somehow, the poplling doesnt event start,…
I put a little check Polling function:

if (device.HasSubscribers() == false) {
console.log(“No subscribers”)
return;
}

but with this no polling is being started…

Using the pagebrowser deosn’t trigger the event when i switch between pages?

[bill (Bill Venhaus)]

It’s compatible with PageBrowsers.

[Zoltan_Kiss]

What event is triggered when user switches to a certain page?
Or we dont need to check this?
OnPoll function is running always? Independently of the page being opened or not?
How to achieve that the user will certainly have the content loaded from http whe he switches to a page? Like using this logic: user switches to a page we make one single request than the polling period should start. Is this a good solution?

If it is, how to catch the the page is actualy opened? Is it the onconnect function?

With the previous example i am getting “No subscribers” log message…

[bill (Bill Venhaus)]

There is no page open event that the plugin can subscribe to. Decrease your polling interval & check HasSubscribers() in your plugin’s “onPoll” function. Decrease the PollingInterval to something like 250 milliseconds so that you can call that function every 250 ms.

[Zoltan_Kiss]

Yeah…with low polling time it works ofcourse…unfortunatelly the server that i am requesting doesnt allow more than 6 requests/hour…so this means that every time the user switches to the page he sees a page with full of empty elements…
No workaround that you would suggest please?

[bill (Bill Venhaus)]

You don’t have to poll your server every time onPoll is called. Again, like I said earlier. Store the actual server poll time in a variable & compare the current time with that. You can add another “if” statement in your code.

@bill

Decrease the polling interval & add a global variable to your plugin that stores the previous polling time. Then compare the current time with that previous poll time in your polling routine. If the difference is greater than 5 minutes, then actually send your HTTP request.