Guys, welcome. Please tell me how the message is implemented, if for example the user has changed the 1 input form, and leaves the page (or updates it) without pressing the save button. How to stop / notify that data is not saved?
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Source: https://ru.stackoverflow.com/questions/744484/
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window.onbeforeunload = function() { return ('Все данные, которые вы ввели будут потеряны');};and after savingwindow.onbeforeunload = "";- splash58