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Avoid success message after page refresh [F5]

After storing a form, a success message is displayed usually . That message will be going to be shown again when user reloads the page [F5].

But, has that process been executed again? Let’s think of a message like “Email sent”. Has that mail been sent again?

I was unsure at first until I tried it myself. Result: The submit processes (code in the “Processing” section) are not executed again. That’s fair enough.

Unfortunately, the success message is still displayed again.

How can this behavior be prevented?

The success message is triggered via the parameter success_msg in the URL (see screenshot at the top). To prevent this message from appearing during reload, we have to get rid of this parameter. We can do this with a few lines of JavaScript.

Here is a JavaScript function that we can store centrally (for example, in a separate file under Shared Components). As a test, we can store it on the page under “Function and Global Variable Declaration”.

function removeParam(key, sourceURL) {
  var rtn = sourceURL.split("?")[0],
    param,
    params_arr = [],
    queryString = (sourceURL.indexOf("?") !== -1) ? sourceURL.split("?")[1] : "";
  if (queryString !== "") {
    params_arr = queryString.split("&");
    for (var i = params_arr.length - 1; i >= 0; i -= 1) {
      param = params_arr[i].split("=")[0];
      if (param === key) {
        params_arr.splice(i, 1);
      }
    }
    rtn = rtn + "?" + params_arr.join("&");
  }
  return rtn;
}

This function should be called directly when the page is loaded. We create the following call under “Execute when Page Loads”.

window.history.pushState("object or string", "Title", removeParam("success_msg", window.location.href)); 

The parameter is removed after the page is loaded and after a Page Refresh [F5] the message no longer appears.

Von Markus Hohloch

Selbständiger Berater für Softwareentwicklung und Informationstechnik. Schwerpunkte sind die Entwicklung von Web-Applikationen mit Oracle APEX oder Java und Jasper Reports.

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