How to close modal dialog when file download completed

I have a modal dialog which contain form and hidden iframe to which form is submitted. The result of submission is file to download. I need to close modal dialog as soon as download dialog is opened i.e. file is ready. I was trying to catch 'onreadystatechange' event of iframe, but after submit call changing state to 'complete' it does not trigger 'onreadystatechange' event.

Eventually, i use window.setInterval which monitoring readyState of iframe and cl开发者_如何学JAVAose modal dialog when its state == 'complete'.

the solution that using window.setInterval seems not professional to me and I am looking for better solution, I saw solution with cookies but I can't use cookies in my application.

Any help will be appreciated!

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There is nothing wrong or unprofessional in using window.setInterval().

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 function Close_Popup() {
        $(".modal-backdrop").remove();
        $('#div_Popup1').modal('hide');
        $(".modal-backdrop fade in").remove();
    }

Call this function on OnClientClick="Close_div_Popup1_Popup();"