Check Internet Connectivity

[Former Community Member]

Designer 8.1



Hi,



I have a form, which has a number of image objects linked to url resources.



If the form is opened when there is no internet connection on the machine, the images do not appear, but unlike a web page, there is no x in the corner of the image field to indicate that the image is missing.



I want to run a script that retuns true/false it the internet is available/unavailable. I can then hide the empty image fields and show a text field advising the user that the need to be connected to the internet.



I suspect I need a javascript function that tries to access the internet so that I can capture the error when this fails.



I just don't know what function I can use to test the internet connectivity.



Does anyone have any ideas?



Thanks



James

[Mark_Lindberg]

Try looking at the app.launchURL method.



You might need to wrap the call such that you launch a well known URL, and close the window very soon afterward on success or failure.



Mark

[Jared_Langdon]

Check out the FormCalc post function in the FormCalc documentation. Try using it on initialize of the form to check for connectivity. Let us know if that works out.

[Former Community Member]

Mark,



I can get the app.LaunchURL to fire, but there doesn't appear to be an error returned. The Browser is opened and the error is in the browser. I have a try..catch block but there is nothing for it to catch



function fnGetInternetConnection(){

var e;

try{

// app.launchURL("http://www.google.com", true);

//Post("www.google.co.uk","test");

}catch(e){

xfa.host.messageBox("fnFormatCityTime(): " + e);

}

}



Jared,



How do I catch an error using FormCalc?



Thanks



James

[Jared_Langdon]

Good question. I don't know how FormCalc does error handling. I could find no mention of it in the documentation. Even if we could figure that out though, there's another problem with the idea. Acrobat/Reader prompts the user when you use get() or post() to ask permission to access the web site. That makes a lot of sense, since you wouldn't want the form posting your data without the user knowing it. I wonder if the same thing happens with web services.