window.downloadFile = function (sUrl) {

    //iOS devices do not support downloading. We have to inform user about this.

    if (/(iP)/g.test(navigator.userAgent)) {

        alert('Your device does not support files downloading. Please try again in desktop browser.');

        return false;

    }

    //If in Chrome or Safari - download via virtual link click

    if (window.downloadFile.isChrome || window.downloadFile.isSafari) {

        //Creating new link node.

        var link = document.createElement('a');

        link.href = sUrl;

        if (link.download !== undefined) {

            //Set HTML5 download attribute. This will prevent file from opening if supported.

            var fileName = sUrl.substring(sUrl.lastIndexOf('/') + 1, sUrl.length);

            link.download = fileName;

        }

        //Dispatching click event.

        if (document.createEvent) {

            var e = document.createEvent('MouseEvents');

            e.initEvent('click', true, true);

            link.dispatchEvent(e);

            return true;

        }

    }

    // Force file download (whether supported by server).

    if (sUrl.indexOf('?') === -1) {

        sUrl += '?download';

    }

    window.open(sUrl, '_self');

    return true;

}

window.downloadFile.isChrome = navigator.userAgent.toLowerCase().indexOf('chrome') > -1;

window.downloadFile.isSafari = navigator.userAgent.toLowerCase().indexOf('safari') > -1;