[Solved] How to pass a value from javascript function? [duplicate]

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To communicate between javascript (which runs on the client machine’s browser) and PHP (which runs on your server) you need to use ajax. Since you are already using jQuery, I suggest using their abstraction method $.ajax(). It would look something like this:

// post value of #progressbar id to my php page
$.ajax({
    url: myPHPPage.php,
    data: JSON.stringify({ progressbarID: '#progressbar' }),
    success: function (dataFromServer) {
        alert('it worked!');
    },
    error: function (jqXHR) {
        alert('something went horribly wrong!');
    }
});

solved How to pass a value from javascript function? [duplicate]