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• Tools for building long-running Javascript webapp

  - by FilipK

  Given my lack of familiarity with such tools, could you suggest what tools / frameworks would be suitable for developing a long-running JavaScript webapp? The webapp would display a constantly updating chart. The updates would come through WebSockets (preferably) or XmlHttpRequest. I know and have written JavaScript with JQuery, but for this task I assume something like backbone.js or ExtJS would be appropriate (or maybe not?).

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• What is a good strategy for binding view objects to model objects in C++?

  - by B.J.

  Imagine I have a rich data model that is represented by a hierarchy of objects. I also have a view hierarchy with views that can extract required data from model objects and display the data (and allow the user to manipulate the data). Actually, there could be multiple view hierarchies that can represent and manipulate the model (e.g. an overview-detail view and a direct manipulation view). My current approach for this is for the controller layer to store a reference to the underlying model object in the View object. The view object can then get the current data from the model for display, and can send the model object messages to update the data. View objects are effectively observers of the model objects and the model objects broadcast notifications when properties change. This approach allows all the views to update simultaneously when any view changes the model. Implemented carefully, this all works. However, it does require a lot of work to ensure that no view or model objects hold any stale references to model objects. The user can delete model objects or sub-hierarchies of the model at any time. Ensuring that all the view objects that hold references to the model objects that have been deleted is time-consuming and difficult. It feels like the approach I have been taking is not especially clean; while I don't want to have to have explicit code in the controller layer for mediating the communication between the views and the model, it seems like there must be a better (implicit) approach for establishing bindings between the view and the model and between related model objects. In particular, I am looking for an approach (in C++) that understands two key points: There is a many to one relationship between view and model objects If the underlying model object is destroyed, all the dependent view objects must be cleaned up so that no stale references exist While shared_ptr and weak_ptr can be used to manage the lifetimes of the underlying model objects and allows for weak references from the view to the model, they don't provide for notification of the destruction of the underlying object (they do in the sense that the use of a stale weak_ptr allows for notification), but I need an approach that notifies the dependent objects that their weak reference is going away. Can anyone suggest a good strategy to manage this?

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• Architecture Best Practice (MVC): Repository Returns Object & Object Member Accessed Directly or Repository Returns Object Member

  - by coderabbi

  Architecturally speaking, which is the preferable approach (and why)? $validation_date = $users_repository->getUser($user_id)->validation_date; Seems to violate Law of Demeter by accessing member of object returned by method call Seems to violate Encapsulation by accessing object member directly $validation_date = $users_repository->getUserValidationDate($user_id); Seems to violate Single Responsibility Principle as $users_repository no longer just returns User objects

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• How to begin? Windows 8 Development

  - by Dennis Vroegop

  Ok. I convinced you in my last post to do some Win8 development. You want a piece of that cake, or whatever your reasons may be. Good! Welcome to the club! Now let me ask you a question: what are you going to write? Ah. That’s the big one, isn’t it? What indeed? If you have been creating applications for computers before you’re in for quite a shock. The way people perceive apps on a tablet is quite different from what we know as applications. There’s a reason we call them apps instead of applications! Yes, technically they are applications but we don’t call them apps only because it sounds cool. The abbreviated form of the word applications itself is a pointer. Apps are small. Apps are focused. Apps are more lightweight. Apps do one thing but they do that one thing extremely good. In the ‘old’ days we wrote huge systems. We build ecosystems of services, screens, databases and more to create a system that provides value for the user. Think about it: what application do you use most at work? Can you in one sentence describe what it is, or what it does and yet still distinctively describe its purpose? I doubt you can. Let’s have a look at Outlouk. We all know it and we all love or hate it. But what is it? A mail program? No, there’s so much more there: calendar, contacts, RSS feeds and so on. Some call it a ‘collaboration’  application but that’s not really true as well. After all, why should a collaboration application give me my schedule for the day? I think the best way to describe Outlook is “client for Exchange”  although that isn’t accurate either. Anyway: Outlook is a great application but it’s not an ‘app’ and therefor not very suitable for WinRT. Ok. Disclaimer here: yes, you can write big applications for WinRT. Some will. But that’s not what 99.9% of the developers will do. So I am stating here that big applications are not meant for WinRT. If 0.01% of the developers think that this is nonsense then they are welcome to go ahead but for the majority here this is not what we’re talking about. So: Apps are small, lightweight and good at what they do but only at that. If you’re a Phone developer you already know that: Phone apps on any platform fit the description I have above. If you’ve ever worked in a large cooperation before you might have seen one of these before: the Mission Statement. It’s supposed to be a oneliner that sums up what the company is supposed to do. Funny enough: although this doesn’t work for large companies it does work for defining your app. A mission statement for an app describes what it does. If it doesn’t fit in the mission statement then your app is going to get to big and will fail. A statement like this should be in the following style “<your app name> is the best app to <describe single task>” Fill in the blanks, write it and go! Mmm.. not really. There are some things there we need to think about. But the statement is a very, very important one. If you cannot fit your app in that line you’re preparing to fail. Your app will become to big, its purpose will be unclear and it will be hard to use. People won’t download it and those who do will give it a bad rating therefor preventing that huge success you’ve been dreaming about. Stick to the statement! Ok, let’s give it a try: “PlanesAreCool” is the best app to do planespotting in the field. You might have seen these people along runways of airports: taking photographs of airplanes and noting down their numbers and arrival- and departure times. We are going to help them out with our great app! If you look at the statement, can you guess what it does? I bet you can. If you find out it isn’t clear enough of if it’s too broad, refine it. This is probably the most important step in the development of your app so give it enough time! So. We’ve got the statement. Print it out, stick it to the wall and look at it. What does it tell you? If you see this, what do you think the app does? Write that down. Sit down with some friends and talk about it. What do they expect from an app like this? Write that down as well. Brainstorm. Make a list of features. This is mine: Note planes Look up aircraft carriers Add pictures of that plane Look up airfields Notify friends of new spots Look up details of a type of plane Plot a graph with arrival and departure times Share new spots on social media Look up history of a particular aircraft Compare your spots with friends Write down arrival times Write down departure times Write down wind conditions Write down the runway they take Look up weather conditions for next spotting day Invite friends to join you for a day of spotting. Now, I must make it clear that I am not a planespotter nor do I know what one does. So if the above list makes no sense, I apologize. There is a lesson: write apps for stuff you know about…. First of all, let’s look at our statement and then go through the list of features. Remove everything that has nothing to do with that statement! If you end up with an empty list, try again with both steps. Note planes Look up aircraft carriers Add pictures of that plane Look up airfields Notify friends of new spots Look up details of a type of plane Plot a graph with arrival and departure times Share new spots on social media Look up history of a particular aircraft Compare your spots with friends Write down arrival times Write down departure times Write down wind conditions Write down the runway they take Look up weather conditions for next spotting day Invite friends to join you for a day of spotting. That's better. The things I removed could be pretty useful to a plane spotter and could be fun to write. But do they match the statement? I said that the app is for spotting in the field, so “look up airfields” doesn’t belong there: I know where I am so why look it up? And the same goes for inviting friends or looking up the weather conditions for tomorrow. I am at the airfield right now, looking through my binoculars at the planes. I know the weather now and I don’t care about tomorrow. If you feel the items you’ve crossed out are valuable, then why not write another app? One that says “SpotNoter” is the best app for preparing a day of spotting with my friends. That’s a different app! Remember: Win8 apps are small and very good at doing ONE thing, and one thing only! If you have made that list, it’s time to prepare the navigation of your app. The navigation is how users see your app and how they use it. We’ll do that next time!

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• Java heap space

  - by java_mouse

  In Java/JVM, why do we call the memory place where Java creates objects as "Heap"? Does it use the Heap Data Structure to create/remove/maintain the objects? As I read in the documentation of Heap data structure, the algorithm compares the objects with existing nodes and places them in such a way that Parent object is "greater" than the children. ( Or "lesser" in case of min heap). So in JVM, how are the objects compared against each other before placing them in the heap?

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• A Computer Novice Can Build A Website

  Well, you know how things have been lately, economic downturn, credit crunch - call it what you like, but work has been slow, so, I decided that what I really needed to do was get a website designed,... [Author: Barney Yarnell - Web Design and Development - June 18, 2010]

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• How to automatically switch monitors with my laptop dock

  - by Cas

  I have a Dell Precision M4300 with a Dell Dock PRO1X running Ubuntu Natty. When I have the laptop docked the lcd display is off and I use two external monitors however when I undock the laptop it does not switch to the laptop screen. The same happens when I dock the laptop, it does not switch to the external monitors. If I reboot the laptop it will choose the correct setup but it will not automatically change monitors with Ubuntu running. My Xorg.conf

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• How to set MANPATH without overriding defaults?

  - by balki

  I have added extra directories to $PATH by exporting PATH=/my/dirs:$PATH But I am not sure if I should do the same to MANPATH. Because default MANPATH is empty yet man command works. I found a command called manpath and its manual says If $MANPATH is set, manpath will simply display its contents and issue a warning.. Does this mean setting MANPATH is not the right way to add directories for man command to search for manual pages?

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• Should a programmer be indispensable?

  - by Tim

  As a programmer or system administrator, you could either strive to have your fingers in every system or to isolate yourself as much as possible to become an easily-substituted cog. Advantages of the latter include being able to take vacations and not being on call, while the former means that you'd always have something to do and be very difficult to fire. Aiming for either extreme would require a conscious effort. Except for the obvious ethical considerations, what should one strive for?

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• Learn How to Create High-Converting Landing Pages - Part 4

  Once you have placed call to action through your pay per click ads on the landing pages, you have to make sure that as part of your SEO plan, you must include paid keyword several times in your landing pages which will lead to well optimized pages under your search engine marketing efforts. As a smart SEO expert, it is important for you to include the keywords in a manner that it cannot be skipped by your readers because if it is missed, it will affect your PPC campaign management and search engine optimization results.

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• twin view on gnome when monitor is unplugged

  - by james t

  i have a macbook pro which is often connected to a monitor, twin view on gnome works pretty well, but a problem arises when i disconnect the monitor, any window that resided on that workspace is no longer available. another issue is when i start my computer when a monitor is not present, because xorg.conf file has the monitor configuration in it, my mouse pointer often disappears in the other monitor's virtual space, as if it is currently plugged, osx deals with this issue elegantly by refreshing the display every time a plug in/out occurs, is there anything similar that can be done in linux ?

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• quickly package --extras doesn't produce /opt/extras.ubuntu.com/../share/locale

  - by user75704

  I'm trying to package an app to /opt, but when installed the app won't run and complains: Traceback (most recent call last): File "/opt/extras.ubuntu.com/drawers/bin/drawers", line 45, in <module> import drawers File "/opt/extras.ubuntu.com/drawers/drawers/__init__.py", line 21, in <module> locale.bindtextdomain('drawers', '/opt/extras.ubuntu.com/drawers/share/locale') NameError: name 'locale' is not defined I can't figure out what I need to change. Is there a config file I need to alter?

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• Auto Selecting Cultures for Localization in ASP.NET

  - by Rick Strahl

  When creating multi-language Web sites, one of the key issues you need to deal with is how to assign a culture to display the appropriate resources. Whether you need to auto-switch locales based on browser language, or explicitly assign a locale based on user preferences there is generally some code logic involved in making these decisions. In this post I show what options are available and a small helper that simplifies setting the culture in ASP.NET applications.

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• Unable to add PPA, Help needed?

  - by Tanmay

  When I typed this command in the terminal: sudo add-apt-repository ppa:noobslab/icons I got the following error. Please help. Traceback (most recent call last): File "/usr/bin/add-apt-repository", line 125, in <module> ppa_info = get_ppa_info_from_lp(user, ppa_name) File "/usr/lib/python2.7/dist-packages/softwareproperties/ppa.py", line 80, in get_ppa_info_from_lp curl.perform() pycurl.error: (7, "couldn't connect to host")

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• What are the names for various forms of camel-case style naming?

  - by Robert Dailey

  For the purposes of communicating coding styles to my co-workers, what would I formally call the following variants of camel case? camelCase and CamelCase Notice that the former version starts with a lower-case alphabetic character, and the latter version starts with an upper-case alphabetic character. I assume these have some sort of "official name". Also if there are any other forms I have not listed here, bonus points to those that mention them as well as well as their names.

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• af:inputSlider doesn't render in popup for FF, Safari and Chrome

  - by Frank Nimphius

  A problem reported on OTN is that the af:inputSlider component of Oracle JDeveloper 11.1.2.2 doesn't show on all browsers except IE when the slider is added as the sole component in a popup. The problem reproduces with the ADF Faces component demo and I filed bug 14207690. The work around, posted by OTN user "Tses" is to set the inlineStyle property on the slider to table <af:inputNumberSlider ... inlineStyle="display:table;"/>

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• How to make XFCE show the Shutdown Menu?

  - by topskip

  I have installed XFCE on an "Ubuntu Server" (in a Virtual Machine) so I have a small and fast environment. But when I want to log out, I usually (not always) see a gray shutdown and reboot button, but I like to be able to shutdown via that menu (I know of shutdown -h now, but the users of my machine don't necessarily know). I use the display manager 'slim'. Question: how can I enable these buttons permanently?

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• Why are notifications appearing in the invisible black zone above my monitor ?

  - by Capt.Nemo

  I've got two monitors, with the right side one being slightly lower in the display settings. However any notifications I receive from notify-osd (including pidgin, notify-send etc) are sent to the top-most part of the right monitor screen, which results it in being invisible. And here's a pic of my monitor preferences : I'd earlier used the Wallpaper plugin in compiz to stitch my desktops, and then uninstalled compiz-extras. I'm using Ubuntu 11.04 in classic mode.

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• Creating a voxel chunk with a VBO - How to translate the coordinates of each block and add it to the VBO chunk?

  - by sunsunsunsunsun

  Im trying to make a voxel engine similar to minecraft as a little learning experience and a way to learn some opengl. I have created a chunk class and I want to put all of the vertices for the whole chunk into a single VBO. I was previously only putting each block into a vbo and making a call to render each block. Anyways, I am a bit confused about how I can translate the coordinates of each block in the chunk when I'm putting all vertices into one vbo. This is what I have at the moment. public void putVertices(float tx, float ty, float tz) { float l_length = 1.0f; float l_height = 1.0f; float l_width = 1.0f; vertexPositionData.put(new float[]{ xOffset + l_length + tx, l_height + ty, zOffset + -l_width + tz, xOffset + -l_length + tx, l_height + ty, zOffset + -l_width + tz, xOffset + -l_length + tx, l_height + ty, zOffset + l_width + tz, xOffset + l_length + tx, l_height + ty, zOffset + l_width + tz, xOffset + l_length + tx, -l_height + ty, zOffset + l_width + tz, xOffset + -l_length + tx, -l_height + ty, zOffset + l_width + tz, xOffset + -l_length + tx, -l_height + ty, zOffset + -l_width + tz, xOffset + l_length + tx, -l_height + ty, zOffset + -l_width + tz, xOffset + l_length + tx, l_height + ty, zOffset + l_width + tz, xOffset + -l_length + tx, l_height + ty,zOffset + l_width + tz, xOffset + -l_length + tx, -l_height + ty,zOffset + l_width + tz, xOffset + l_length + tx, -l_height + ty, zOffset + l_width + tz, xOffset + l_length + tx, -l_height + ty, zOffset + -l_width + tz, xOffset + -l_length + tx, -l_height + ty,zOffset + -l_width + tz, xOffset + -l_length + tx, l_height + ty, zOffset + -l_width + tz, xOffset + l_length + tx, l_height + ty, zOffset + -l_width + tz, xOffset + -l_length + tx, l_height + ty, zOffset + l_width + tz, xOffset + -l_length + tx, l_height + ty, zOffset + -l_width + tz, xOffset + -l_length + tx, -l_height + ty, zOffset + -l_width + tz, xOffset + -l_length + tx, -l_height + ty,zOffset + l_width + tz, xOffset + l_length + tx, l_height + ty,zOffset + -l_width + tz, xOffset + l_length + tx, l_height + ty, zOffset + l_width + tz, xOffset + l_length + tx, -l_height + ty, zOffset + l_width + tz, xOffset + l_length + tx, -l_height + ty, zOffset + -l_width + tz }); } public void createChunk() { vertexPositionData = BufferUtils.createFloatBuffer((24*3)*activateBlocks); Random random = new Random(); for (int x = 0; x < CHUNK_SIZE; x++) { for (int y = 0; y < CHUNK_SIZE; y++) { for (int z = 0; z < CHUNK_SIZE; z++) { if(blocks[x][y][z].getActive()) { putVertices(x*2.0f, y*2.0f, z*2.0f); } } } } Whats any easy way to translate the vertices of each block into its correct position? I was previously using glTranslatef with each call to render block but this wont work now. What I am doing now also does not work, the blocks all render in stacks on top of each other and it looks like this: http://i.imgur.com/NyFtBTI.png Thanks

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• .NET Video Series Episode 1: .NET CLR – Common Language Runtime

  I am happy to start Screen cast/Video tutorials of Microsoft .NET. In this video Series this is the first Episode, I explained Common Language Runtime of .NET framework. It covers basic functionality CLR and not specific version of .NET framework. Hope it helps. span.fullpost {display:none;}

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• PPA Shows Up Under "All Software" That Is No Longer Enabled

  - by Icedrake

  I used to use the Aurora builds of Firefox, but now I've uninstalled Firefox and gone back to Chromium. I've removed the PPA, but it still shows up under "All Software" in the Ubuntu Software Center, when I click on the arrow to the side of it to display my PPAs. I've checked the Software Sources to see if there's anything leftover, and there's nothing. I use Y PPA Manager, and there's nothing there to remove as well. How do I get rid of it?

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• Unable to install any linux based os in my HP PAVILION DV6 notebook

  - by Nawin SS

  I tried to install ubuntu 11.04 and 12.04 both with wubi and with dvd.With wubi even when the installation is successfull the os wont boot after some time.and with dvd it shows error "0x0009"and the intallation stops. The same is the case with any linux based os i try to install.With fedora the installation stops after the display,"Detecting hard drive...".Are there any settings that must be changed in my system. Please instruct me how to overcome this obstacle.I am stuck..!

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• Solving “The Select operation is not supported by .. unless the SelectMethod is specified.”

  - by anas

  In most cases, You will get that error when you are using a data source control(like ObjectDataSource) without setting it’s SelectMethod as data source for the DetailsView control. If you want to display one record in the detailsView control to allow the user to edit it, then you should set the SelectMethod for the DataSource control,otherwise the detailsView control will not be able to get the record from the underlying datasource. But what if you are only using the DetailsView for only inserting...(read more)

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• Program menu disappeared

  - by bikeless

  My problem is as follows: The program menu, the one that has file edit view all that does not display in some programs like Audicity Play on linux when i change the theme in the appearance it appears again i really do not know what is wrong with that or why. i have ubuntu 10.10 and running compiz have ubuntu tweak thanks for all that will answer and all that can not really thanks dudes. ubuntu is sure fun

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• Is there an API for determining congressional districts?

  - by ardavis

  I'm looking to determine the congressional district based on an address my user is providing. This will avoid having the user to look it up themselves. Does an API of this sort exist? Note Through my attempts to find one, I've only come across these: http://www.govtrack.us/developers/api (not sure how to submit an an address or zip code however) The following resources are available in the API ...Bills and resolutions in the U.S. Congress since 1973 (the 93rd Congress). ...A (bill, person) pair indicating cosponsorship, with join and withdrawn dates. ...Members of Congress and U.S. Presidents since the founding of the nation. ...Terms held in office by Members of Congress and U.S. Presidents. Each term corresponds with an election, meaning each term in the House covers two years (one 'Congress'), as President four years, and in the Senate six years (three 'Congresses'). ...Roll call votes in the U.S. Congress since 1789. How people voted is accessed through the Vote_voter API. ...How people voted on roll call votes in the U.S. Congress since 1789. See the Vote API. Filter on the vote field to get the results of a particular vote... http://www.opencongress.org/api (seems to be a way to find congress information, but not districts) This API provides programmers with structured access to all the data on OpenCongress, everything from official bill info to news and blog coverage to user-generated votes on bills and much more... This API defaults to returning XML. All queries can also return JSON... https://groups.google.com/forum/?fromgroups=#!topic/opendems-discuss/CeKyi_aANaE (similar question, no resolution) I've been looking over Open Dems, and seeing what's exposed at this point and what isn't. I work with Democrats Abroad, and am interested in using stuff from the lab for their sites. I quickly looked over the Precinct API, which does both more and less than what I'd need. An ideal resource would be any way of translating addresses into CD at the very least (getting state district data would be good as well), since that would make it easier for DA's membership to make a difference in races like last month's NY26 race... Update I'm looking at the source for the govtrack.us website and the 'doGeoCode' function may be useful. view-source:http://www.govtrack.us/congress/members If no one has any suggestions, I will try to go off of what they are doing.

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