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You can prevent form resubmission via a session variable. Yes we can use microtime() as well as time() also instead of rand() , whatever function or variable that gives different value we can use it. BUT make sure that you set that value to SESSION variable.
You have to detect browser back button event and pass as an input of the page you want do prevent URL reload that indicates you if you came from a back button click. this code: $(window). on('popstate', function(event) { alert("pop"); });
You can check if the user clicked the back button, disable form if true. Another way is by storing a cookie which you check on page load, if it exists you can disable the form.
The standard way is to do it in 3 steps.
This breaks the basic browser user experience model...users should always be able to use the Refresh and Back buttons in their browser. Recommend that you fix your page another way.
If you update your question to include the server language/platform/technology that you are using then someone might be able to suggest a solution.
The simple fact that resubmitting the form generates a duplicate transaction is worrying. You should have some sort of check to ensure each submit of form data is unique.
For example, the page which would submit the form should be given a unique ID that gets submitted with the form. The business logic should then be able to recognise that the form submitted has already been processed (as the (no longer) unique ID will be the same), so ignores the second attempt.
The 'standard way' still doesn't stop clients from clicking the back button twice... or even going back and resubmitting the form if they don't think (for whatever reason) it has been processed.
generate a random string and store it in session,
then output it to your form as a hidden value,
check the submitted and store variable, if matches process your request,
go to 1.
Place this code on the form page
Response.Cache.SetCacheability(HttpCacheability.NoCache);
Response.Cache.SetExpires(DateTime.Now-new TimeSpan(1,0,0));
Response.Cache.SetLastModified(DateTime.Now);
Response.Cache.SetAllowResponseInBrowserHistory(false);
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