I have a running copy of the Getting Started Guide. It syncs perfectly with a CouchDB server (at couchappy.com). So far so good.
I need the sync to happen only with a user action (ie. a user hits a button). So I added a button to the markup and wired the click event to the same "sync()" function provided in the Getting Started Guide. Lastly, I changed the two "live" options from "true" to "false".
Whether or not I change values on the client, server or nowhere, when I click the button, it calls the sync function and I get an error for both the replicate.to and replicate.from. I must be missing a basic concept in PouchDB. Can someone help me understand how to get replication working not "live"?
Thanks in advance.
It depends on what your error is, but most likely you need to enable CORS. Check this tutorial, search "CORS".
If that doesn't work, then post your error here along with the version of PouchDB that you're using.
Also, live is false by default, so you don't need to mention it at all. :)
Related
I have an application in which one opens many windows. I added copy/paste, using XA_PRIMARY.
That works fine within my application. It also works fine when copying from other applications (pluma, FireFox, mate terminal) into a window of my application.
When I call XSetSelectionOwner(), with time stamp etc as explained in the documentation, server acknowledges new owner. That is, XGetSelectionOwner() returns the owner I just set.
However, when copying from my app to other applications I do not receive SelectionRequest.
From what I see, server only sets the owner for the Display used in the call XSetSelectionOwner().
Is this how it is supposed to work? Then, is there something else to do so server sets owner for all apps?
Given the behavior of the Server, I had to assume that other clients are not making their request for "PRIMARY". So, I added "CLIPBOARD", and now everything is working great.
The documentation appears to say that every client will use PRIMARY. Further reading seems to indicate that there is a difference between making a "selection", and "copying text". They seem to skirt this as a useful feature. I see nothing but confusion. Anyway, there really was no bug in my app. I think documentation should have a line saying: You must implement both, PRIMARY and CLIPBOARD. That was the problem.
[Disclaimer: I'm not sure if this kind of question is accepted here as it is about a piece of software deployed already. Rest assured I didn't drop any confidential information. Also do tell me if I violated any rules in SO by posting this so I can take it down immediately]
I have a working Learning Management System web application and I recently received a bug report about a button not showing. After investigating, I have proved that the user was not using the web app as intended. When taking an exam, he was opening multiple tabs to exploit the feature that informs him whether the answer was correct or not. He then will use this information to eliminate the wrong answers and submit all the right answers in another tab/window.
I'm using Rails 4.2. Is there a way to prevent multi-tab browsing? I'm thinking like if a user is signed in and he attempted to open a new tab of the webapp, he should see something like "Please use one tab" and all the features/hyperlinks/buttons are disabled.
Here's a screenshot of how I proved he was using multiple tabs. Notice that there are multiple logs of the same attempt # because the current implementation allows saving a study session and resuming later (this is the part that's exploited). The opening of multiple tabs searches for the most recent attempt session and continues from there. This is also the reason why most of the sessions don't have a duration value -- the user only finishes a study session for one tab (by clicking a button that ends the study session). The system cannot compute for the duration because the other sessions don't have an end timestamp.
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This is what a single-tab user looks like:
This is more of an application misuse issue more than a bug.
You should add protection not only from multi tab, but for multi browsers aw well, so it can't be purely FrontEnd check.
One of the solutions could be using ActionCable to check if a user has an active connection already and then act accordingly.
Another, for example, generate a GUID in JS and pass it with every answer. If its different from previous answer, it means user opened a new window.
But of course the solution would depend on your current architecture, without knowing how do you currently organise client-server communication it's hard to give exact and optimal solution.
I found an answer here. I just placed this js in the application view to prevent any extra instance of the website.
Thanks for everyone who pitched in.
I am using Revulytics SDK to track feature usage and came across the below problem.
I am sending feature usage after properly setting up the SDK configuration etc, using the EventTrack() method like this:
GenericReturn grTest = telemetryObj.EventTrack("FeatureUsage", textBoxName.Text.ToString(), null, false);
This returns OK and usually, I can see the usage data in the dashboard. However, after multiple tests, the data I am sending does not show up on the dashboard.
Can anyone hint me how to debug this? Thanks for any help!
I hit a similar issue when first working with this SDK.
I was able to address this as soon as I understood the following:
There are event quotas for the incoming events;
Event names are used for making the distinction.
So when I was sending dummy test data, it made it there, but when I sent some demo data for stakeholders, it was not showing up.
I think the same happens here. You're getting the event name form textbox.text... Pretty sure that varies every time you run the code.
Here are the things to keep in mind when testing your code:
the server has a mechanism to discard / consider events;
implicitly, it allows first xx events depending on the quota;
if you are sending more than xx events, they will not show up in reports.
So, you must control which events to discard and which to consider (there are a couple of levels you can configure, and based of them you can get the events in various types of reports).
Find the "Tracked Events Whitelist Management". You will be able to control these things form there.
This blog helped me (it is not SDK documentation): https://www.revulytics.com/blog/getting-started-with-usage-intelligence-part2-event-tracking
Good luck!
I've got two applications: Interface is a Rails app and Processor is for bash scripts.
I need to notify an Interface user's session if a bash process on Processor fails. I have access to the command line on Processor, so I can hit http://interface.com/process/12/error/:error_message with :error_message set on Processor.
I'm not sure how to make that work though. That route works from the browser, but I don't know how to redirect the user with the error message.
Any help would be great.
Thanks.
To answer this, I am going to make some assumptions about your setup. Please correct me if I don't have it right.
I assume that your Interface user is monitoring your site by visiting a page such as http://interface.com/process/12/monitor on the Interface server and you want the error message to pop up to let them know something went wrong.
Given that, consider having your call to http://interface.com/process/12/error/:error_message store the error in a related ProcessError table. Then, use javascript on the monitor page to poll the Interface server for "new" errors. The polling interval really depends on the situation. If you're the only user, every second would be fine, but if there are going to be lots of monitoring users at once, you would probably want to make the polling interval longer. How long depends on load and how important it is that the user is notified quickly.
A push solution would be more efficient, but is a bit harder to accomplish. If this is appealing to you, have a look at Faye, a publish-subscribe messaging system that supports Rails servers and html+javascript clients.
Hopefully this points you in the right direction!
Hello stackoverflow world.
(This is the first time I actually post a question here. Exciting)
A while ago I inherited a 2 year old MVC website from one of the teams within my corporation. I know most the ins and outs of this solution now but there is something strange cropping up in my error logs which I do not understand.
Every now and then I will get an error messages like this one:
A public action method 'xyz.gif' could not be found on controller MyNamespace.MyController
What I don't understand is WHY is this action (a gif image) being called in the first place?
I've seen 2 different gifs in the error logs pageerror.gif and refresh.gif
As this is an inherited solution I double checked everything and made sure that there are in fact no images like that in the project and no reference anywhere even to those words in the controllers, views, style-sheets or even in the source of pages within the same controller.
I seriously doubt that the users are playing around with the URLs and adding random gif names to them to see what happens.
I'm all out of ideas. Anyone out there who can suggest more places to look for the culprit?
Ta!
As Tchami pointed out in a comment on the original question, this is related to Internet Explorer's default error pages.
As I have set up custom error pages I believe this is either due to an internal server error or possibly somehow an action cancel error from the client side, i.e. client side error. I can't be 100% at this point.
The question is not fully answered but I mostly know what the cause is now.
From my point of view I've identified that I need to improve this ASP.NET MVC application so that
1) it doesn't report/log errors when someone tries to navigate to a non-existing controller action (e.g. these refresh.gif actions or any other)
and 2) handle it better for the client so that they don't end up clicking from one error page (default IE error page) to another (my custom error page when clicking the refresh icon on the IE page)
Another stackoverflow thread on a related topic:
Significance of 'pagerror.gif'?
(i can't post more links as I'm a new user)
CHEERS!
Solveig
Can you get the error to show up in the logs when you use the site yourself? If so, an add-in such as HttpWatch might help you see those .gif requests. If you can understand more about when they happen you might be able to figure out what's going on.
Pagerror.gif and refresh.gif are the default images from the IE browser/IIS server. Normally these images were shown when the browser is not able to retrieve the content.
If you see these errors in logs, then check the iis log to get more information.
For example,
IIS Log : look for this feild ,
cs(User-Agent)
compatible;+MSIE+6.0;+Windows
Here few things to be noted,
1)IE 6.0 apparently makes these requests on its own. I am not sure if any other IE 6+ Browser would show similar behavior.
2)All this will do is generates a 'bogus" event log entry because a null reference exception could happens when you request a non-existing GIF and that request goes through MVC pipeline.
3)Technically this simply can be ignored.
4) Optionally we could check if through routing we could stop “.gif” files from being processed by MVC Pipeline
All i would suggest is to handle it gracefully.
It may be difficult to pinpoint this, but my thought would be: check the javascript. If the image name is being dynamically generated somewhere, and then requested, a simple "find and replace" may miss the reference.