Catch a refresh

WEB TMS WEB Core
1

How to catch a "website refresh" before it refreshes the site

2

There is not really a way this can be reliably be done across all browsers.

Some information in this context:

1 Like
3

It is OK if it only works on Chrome but where to put the javascript in my My delphi code

4

You could try to add an event handler to form.OnBeforeUnload

5

Just checking incase there is something built into WebCore now?

6

Since, as I already informed here, there is no universal solution for this, we haven't implemented something so far.

7

For others, this is working for me so far. If I find a browser that doesn't work, I will have to find a solution for it too, if I can. In my case, the webapp is only used internally by the company employees, so the browser choice is not that wide.

class procedure THtml.Prevent_Refresh;
begin
  asm
    document.addEventListener("keydown", function (event)
    {
      if (event.key === "F5" || (event.ctrlKey && event.key === "r"))
      {
        event.preventDefault();
      }
    });
  end;
end;

class procedure THtml.Warn_Tab_Close;
begin
  asm
    window.addEventListener("beforeunload", function (event)
    {
      event.preventDefault();
      event.returnValue = "";
    });
  end;
end;