Saving data on AngularJS before the user navigates away

One way I am currently using is to store data in localStorage when the user leaves the page:

$window.onbeforeunload = function(){
            saveSomeDataInLocalStorage();
            if($scope.message){
                return "You haven't sent your message yet. Do you want to leave without sending?";
            }
            else
                return null;
        };

If the condition if($scope.message) is met, a confirmation message is displayed and the data is successfully saved in localStorage through the saveSomeDataInLocalStoragefunction. Everything works perfectly...

However, if the else condition is met, the data is not saved even when utilizing the saveSomeDataInLocalStorage function.

It seems like the behavior of the onbeforeunload event is causing this issue... I am having trouble understanding it.

I am looking for a solution to save the data regardless of whether the confirmation message is shown or not.

Is there a possible workaround for this?

Your help is greatly appreciated!

Answer №1

When null is returned, no message is displayed and the page unload proceeds uninterrupted. However, displaying a message during the confirmation process indicates that data is being saved. In order to ensure successful data saving, it may be necessary to 'freeze' the page. Make sure to always show a message along with a status update so users are aware of the ongoing save operation and avoid clicking 'Yes' prematurely.

This event cannot be blocked or intercepted in any way. The handler can only determine whether a confirmation message should be shown. Hopefully this clarifies things for you.

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