More communicative/friendlier UI

[arikfr]

• Notification when save fails
• Show notification when the query has changed, but not saved
• Show confirm box, when trying to leave the page before saving the query
• Turn back on browser notifications
• Show error message when execute fails

[arikfr]

For the notification when leaving the page:

    var leavingPageText = "You'll lose your changes if you leave";
    window.onbeforeunload = function(){
        return leavingPageText;
    }

    $scope.$on('$locationChangeStart', function(event, next, current) {
        if(!confirm(leavingPageText + "\n\nAre you sure you want to leave this page?")) {
            event.preventDefault();
        }
    });

[amirnissim]

TODO: make the navigation alert re-usable on other pages

[arikfr]

@amirnissim this kind of TODOs I write as comments in the code :-)

[amirnissim]

you merged the PR before I got a chance to amend it :/

[amirnissim]

"Show notification when the query has changed, but not saved" should probably apply also to the query name and description right?

[arikfr]

Right indeed.

[amirnissim]

what about [5]?

[arikfr]

Not that important.