How do I check internet connection on mobile?

I've written software in other languages that needed internet connections and what I've discovered is that many functions like .isOnline are querying some driver or some device and often don't really know if the device is connected or not.

One of the easiest ways in Construct and one pretty much guaranteed to pass or fail, is to do an Ajax call to a website you know is going to be up and one that accepts Ajax calls from anyone. Or, create your own php file on a webserver and do an Ajax call to it.

Google has a bunch of resources that accept open Ajax calls. One is for jquery, both current and past versions:

ajax.googleapis.com/ajax/libs/jquery/3.4.1/jquery.min.js

+ System: On start of layout
-> AJAX: Request "https://ajax.googleapis.com/ajax/libs/jquery/3.4.1/jquery.min.js" (tag "check")

+ AJAX: On "check" completed
-> Text: Set text to "Passed"

+ AJAX: On any error
-> Text: Set text to "Failed"

Don't want to/can't host a no-op endpoint then you could use example.com. Better yet, make a HEAD call rather than a GET call, which reduces the size from 1,270 bytes to 606 bytes.

To be super fast though, just do the TCP connection, only three packets and no other overhead that way.

Don't want to/can't host a no-op endpoint then you could use example.com. Better yet, make a HEAD call rather than a get call, which reduces the size from 1,270 bytes to 606 bytes.

To be super fast though, just do the TCP connection, only three packets and no other overhead that way.

Hi Buddy,

can you may explain this a little bit more in detail? :)

This sounds good! Can you write down the each steps? :)

Thanks!

I personally couldn't get example.com to work. But to do a "HEAD" call which only returns the header of the site you're contacting and not all of the content (which is smaller memory wise and a fraction of a second faster), change the first line in my example to this:

> -> AJAX: Send "" to URL "https://ajax.googleapis.com/ajax/libs/jquery/3.4.1/jquery.min.js" (method "HEAD", tag "check")

i did that but nothing happens.. text will not change

And I run this:

+ System: On start of layout
-> AJAX: Send "" to URL "https://ajax.googleapis.com/ajax/libs/jquery/3.4.1/jquery.min.js" (method "HEAD", tag "example")

+ AJAX: On "example" completed
-> Text: Set text to "passed"

+ AJAX: On "example" error
-> Text: Set text to "failed"

Fengist explained what I meant. No idea if you can make a TCP handshake happen in Construct/JavaScript but if you could then that would be good.

My point about using example.com is that it is one of four special domains that are specifically reserved for when you need a real domain, that works, but doesn't actually do anything.

• example.com
• example.net
• example.org
• example.edu

You could use a domain that's probably always there, but this is better. I've never known it return anything other than a 200.

You could use an endpoint you host, which means you can have control and responsibility of keeping it available.

The acid test for choosing whether to use you own endpoint or to use example.* is this: Do you want to test whether the internet is accessible, or do you want to test if your specific resource is accessible?

Fengist explained what I meant. No idea if you can make a TCP handshake happen in Construct/JavaScript but if you could then that would be good.

My point about using example.com is that it is one of four special domains that are specifically reserved for when you need a real domain, that works, but doesn't actually do anything.

• example.com
• example.net
• example.org
• example.edu

You could use a domain that's probably always there, but this is better. I've never known it return anything other than a 200.

You could use an endpoint you host, which means you can have control and responsibility of keeping it available.

The acid test for choosing whether to use you own endpoint or to use example.* is this: Do you want to test whether the internet is accessible, or do you want to test if your specific resource is accessible?

For some reason your example doesn't work for me...

Everytime it says "fail". What am i doing wrong here? :(

I don't think you're doing anything wrong. Ajax needs a special 'header' on the other end to allow it to interact with the website. The google url has that header. I don't think example.com does.

Just do the head post to the google url or one of your own. It's fast and there are no ajax results actually returned so it doesn't consume any memory.

Here, this definitely works on my system:

https://www.twistedvoid.com/c3examples/headcheck.c3p

None of these methods are working for me on device. I have 'always connected' regardless if I am actually connected or not and I'm doing an AJAX check to

"https://ajax.googleapis.com/ajax/libs/jquery/3.4.1/jquery.min.js"

every 2 seconds. (I tried various other websites too)

Like everyone said the browser event doesn't work on a device and nor does the PlatformInfo.ConnectionRTT method work (always returns 0 on device).

Regarding CORS if I add a header "Access-Control-Allow-Origin" "*" then I just get Not COnnected all the time.

I also tried various plugins of which all had other compatibility issues.

I would have thought this was a very commonly used feature in most mobile games, so I'm surprised there isn't an obvious solution.

Where to turn next?