Check internet connection before save a form

Hello,
I am developing an application that will be used on tablets using 4G.
The forms have more than 200 fields.
I need to check that the tablet has internet access before saving the form.
I have verified that once I try to save a form, if there is no internet access, scriptcase returns an error and the entered data is lost without option to retry.
Can somebody help me?

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try it with AJAX. Examples are in the samples for forms. Or here’s another simple example https://werner-zenk.de/scripte/formulardaten_ueber_ajax_ueberpruefen_und_speichern.php

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