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• Can JQuery/JavaScript be used to write a substantial client side application?

  - by Ian

  I have an unusual situation - I have an embedded video streaming device with a complicated UI, and I need to use an embedded web server to reproduce that UI through a web browser. I'm thinking of using JavaScript/JQuery on a C++ backend (I am NOT coding all this myself, I need to hire people for the grunt work). The embedded web server is much less powerful than a PC, so I want to write an application that runs the entire UI in the browser, and only communicates with the server to pass new program settings back and forth, get status updates from the device, and control video playback. In other words, the client gets one big page or a small number of big pages (effectively downloading the application), the application maintains significant local memory storage, and once the pages are first loaded the server never sends anything layout-related. The application has two rows of tabs to navigate ~40 menu pages, drag-and-select controls to pick cells in a grid, sorted lists, lots of standard data entry options, and it should be able to control up to 16 embedded video players at once (preferably VLC). Is this possible in JavaScript/JQuery with a C++ backend?

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• 1120: Why can't it access the variable?

  - by Oden

  I'm new at as3, maybe thats the reason why i don't understand, why the setInterval causes an error. <mx:Script> <![CDATA[ import flash.utils.setInterval; import mx.controls.Alert; [Bindable] public var MyInt:int = 500; setInterval(function():void{ ++MyInt; },1000); ]]> </mx:Script> I have a label where the value of MyInt gets visible, the bind works perfect, i've tested it several ways, and i i create a button it grows the number, but if i use the setInterval function i get an error: Access of undefined property myInt. Why? What does cause this? Please explain it, so I can avoid errors like this. Thanks

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• How to use multiple restrictions in C# Generics properly?

  - by plouh

  I am attempting to bind c# generics to a class and an interface like this: public class WizardPage<T> where T : UserControl, IWizardControl { private T page; public WizardPage( T page ) { this.page = page; } } And use it with this: public MyControl : UserControl, IWizardControl { //... } Somehow C# doesn't seem to be able to decide that MyControl is a proper instance of T as public class Wizard<T> where T : UserControl, IWizardControl { private WizardPage<T> Page1; public Wizard( MyControl control ) { this.Page1 = new WizardPage(control); } } fails with error The best overloaded method match for 'Controls.WizardPage.WizardPage(T)' has some invalid arguments Am I doing something wrong or is this just not going to work?

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• Rails how to return a list of answers with a specific question_id

  - by mytwocentsisworthtwocents

  Let's say I have two Models, Answers and Questions (there are others, but irrelevant to the question). The models are as follows: Answer.rb class Answer < ActiveRecord::Base attr_accessible :description, :question_id has_one :question, :through => :user, :dependent => :destroy validates :description, :presence => true end Question.rb class Question < ActiveRecord::Base attr_accessible :budget, :description, :headline, :user_id, :updated_at, :created_at belongs_to :user has_many :answers validates :headline, :description, :user_id, :presence => true end I'd like to display on a page a list of all answers associated with a question, and only those questions. I got this far. I believe this variable finds all the questions in the database by the question_id (foreign key): @findanswers = Answer.all(params[:question_id]) And this one grabs the the id of the current question (this code will reside as an ERB on the page where the current question is located): @questionshow = Question.find(params[:id]) And now I'm stuck. How do I put the two together so that I list all the answers with the current question id?

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• Trouble using files Globally

  - by Nightforce2

  Recently I ran into trouble when I discovered that vista restricts what can be installed into the system32 directory even though I am the administrator for this computer. It will not allow me to register dll files so I can use programs like wget globally like how programs "nslookup" etc are used. Keeps giving me this error. Regsvr32: The module "C:\Windows\System32\libeay32.dll" failed to load. make sure the binary is stored at the specified path or debug it to check for problems with the binary or dependent .DLL files. The specified module could not be found. Moving the required DLL files to system32 prompts me to confirm administrator privileges are needed to move these files, So I give the permission, copy the files to system32, and run wget to confirm. This is where it tells me it cannot find the DLL's required to run and when using regsvr32 it says it cannot find the entry point so it will not load the DLL asking me if it is a valid DLL or OCX file. If I leave the DLL's that came with wget in the same folder as wget outsite of system32 they work vice adding them to system32 with the exe it will not work saying it cannot read the those dll files. Is there a way around this or Do I need to Upgrade to Windows 7 to get away from these problems/restrictions?

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• Rotating Viewbox contents smoothly

  - by user204562

  I'm looking to teach myself better methods of doing things in WPF that I would normally do manually. In this case, I have a ViewBox with an image in it. I also have a button that uses a DoubleAnimation to rotate the image 90 to the right. This animation works fine, but obviously because it's square as it turns, the image does a "best fit" to the ViewBox which makes the rotation look quite bad, as it gets larger and smaller as its longest edge shrinks or grows to fit to that particular rotation angle. I am looking for any advice on the best way to handle this using appropriate WPF methods. Obviously I could do all the calculations manually, but I would be more interested in finding a way to use the controls and methods built into the .NET architecture. Thanks for your help.

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• this.Dispose() Don't release memory used by Form after Closing it .

  - by Ehab Sutan

  Hello, in C# Application. I've a windows form application in which clicking certain button make object from a 2nd Form. On closing this 2nd From by user Memory used by this form not released (from Task Manager). I Tried using this.dispose() on exit button ,tried this.close() , tried form2 =null in the main code ,and tried clearing all controls from this form by code before Disposing and every time the clicks the button memory usage by the application increases more and memory used by previous instance not released. What shall i use to solve this problem ?

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• Input type button/submit that does both form validation and submit via jquery ajax?

  - by Pandiya Chendur

  I am trying to use jquery validator plugin and form submit via ajax in jquery..... Validator plugin works with <input type="submit" value="Add a client" id="clientadd"/> but my form submit works with <input type="button" value="Add a client" id="clientadd"/>..... <form id="addform" autocomplete="off"> //My controls here </form> I didn't specify action and method attributes here as i ll submit my form using jquery.ajax().... Any suggestion how to get both working together....

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• How can I strip non-XHTML tags from a string in C#?

  - by No Average Geek

  I need to be able to remove non-XHTML tags from a string containing XHTML that has been stored in a database. The string also contains references for controls (e.g. ) inside the XHTML, but I need clean XHTML with all standard tag contents unchanged. These control tags are varied (they could be any ASP.NET control), so there are too many to go looking for each one and remove them. The way they are closed is also varied, so not all of them have closing tags, some are self closing. How can I go about doing this? I've found some HTML cleaners on-line for including in my project, but they either remove everything or just HTML encode the entire string. Also, I'm dealing with parts of XHTML documents, not entire documents - don't know if that makes a difference. Any help would be appreciated.

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• C# Events between threads executed in their own thread (How to) ?

  - by Guillaume

  Hello, I'd like to have two Threads. Let's call them : Thread A Thread B Thread A fires an event and thread B listen to this event. When the Thread B Event Listener is executed, it's executed with the Thread A's thread ID, so i guess it is executed within the Thread A. What I'd like to do is be able to fire event to Thread B saying something like: "hey, a data is ready for you, you can deal with it now". This event must be executed in its own Thread because it uses things that only him can access (like UI controls). How can I do that ? Thank you for you help.

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• Should Service Depend on Many Repositories, or Break Them Up?

  - by Josh Pollard

  I'm using a repository pattern for my data access. So I basically have a repository per table/class. My UI currently uses service classes to actually get things done, and these service classes wrap, and therefore depend on repositories. In many cases my services are only dependent upon one or two repositories, so things aren't too crazy. Unfortunately, one of my forms in the UI expects the user to enter data that will span five different tables. For this form I made a single service class that depends upon five repositories. Then the methods within the service for saving and loading the data call the appropriate methods on all of the corresponding repositories. As you can imagine, the save and load methods in this service are really big. Also, unit testing this service is getting really difficult because I have to setup so many fake repositories. Would it have been a better choice to break this single service apart into a few smaller services? It would put more code at the UI layer, but would make the services smaller and more testable.

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• C++: What is the size of an object of an empty class?

  - by Ashwin

  I was wondering what could be the size of an object of an empty class. It surely could not be 0 bytes since it should be possible to reference and point to it like any other object. But, how big is such an object? I used this small program: #include <iostream> using namespace std; class Empty {}; int main() { Empty e; cerr << sizeof(e) << endl; return 0; } The output I got on both Visual C++ and Cygwin-g++ compilers was 1 byte! This was a little surprising to me since I was expecting it to be of the size of the machine word (32 bits or 4 bytes). Can anyone explain why the size of 1 byte? Why not 4 bytes? Is this dependent on compiler or the machine too? Also, can someone give a more cogent reason for why an empty class object will not be of size 0 bytes?

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• At what asp.net page event are clientIDs assigned?

  - by user191272

  I want to do something like this: Panel divPanel = new Panel(); divPanel.ID = "divPanel"; this.Page.Controls.Add(divPanel); string script = "function alertID(){alert("the id is: "+divPanel.ClientID+");}"; this.Page.ClientScript.RegisterClientScriptBlock(this.GetType(), "scripttests", script); But when I put this code in page_load, I don't get the full id, which is ctl00_ContentMain_divPanel, I just get divPanel. Is there another event I should use? How do I make this work?

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• AJAX Panel not throwing exceptions

  - by Grant

  Hi, i have just noticed something strange in some asp.net markup. I have a standard form with a couple of textboxes and a submit button. When clicked the code behind will attempt to perform some logic and then return. If the input values are not valid it used to throw an exception. The moment i wrapped the controls in an AJAX update panel and try to submit bad data, no exception is thrown and the panel returns like nothing was wrong. Does anyone know how to return this to the previous behavior whilst keeping the update panel?

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• asp.net multiple textbox validation

  - by Zaps

  Hi, I currently have 3 textbox controls on my page. I also have a required valdiator of each of the textboxes. However I only want the validator for a textbox to fire if there is text in either of the other 2 textboxes. If all 3 textboxes are empty then no validators should fire. Is there any way I can do this in javascript/jquery as I want the user to get the best experience possible. Any help would be greatly appreciated. Thanks in advance.

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• Rails Form Submission, User can't be blank

  - by pmanning

  I'm trying to create an event through an event form and I keep getting a form error that says "User can't be blank". The event needs a user_id to post a feed_item showing who created the event. Why can't this event get created? event.rb class Event < ActiveRecord::Base attr_accessible :description, :location, :title, :category_id, :start_date, :start_time, :end_date, :end_time, :image belongs_to :user belongs_to :category has_many :rsvps has_many :users, through: :rsvps, dependent: :destroy mount_uploader :image, ImageUploader validates :title, presence: true, length: { maximum: 60 } validates :user_id, presence: true create_events.rb (database) class CreateEvents < ActiveRecord::Migration def change create_table :events do |t| t.string :title t.date :start_date t.time :start_time t.date :end_date t.time :end_time t.string :location t.string :description t.integer :category_id t.integer :user_id t.timestamps end add_index :events, [:user_id, :created_at] end end events_controller.rb def new @event = Event.new @user = current_user end def create @event = current_user.events.build(params[:event]) if @event.save flash[:success] = "Sesh created!" redirect_to root_url else @feed_items = [] render 'static_pages/home' end end routes.rb SampleApp::Application.routes.draw do resources :users do member do get :following, :followers, :events end end resources :events do member do get :members end end root to: 'static_pages#home' events/new.html.erb <%= form_for @event, :html => {:multipart => true} do |f| %> <%= render 'shared/error_messages', object: @event %>

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• C# creating a custom user interface

  - by CSharpInquisitor

  Hi, I have a SQL database holding a number of numeric and text values that get updated regularly. The exact number/type/names of these data points can change depending on the source of the database writes. I would like to create a user interface editor, where the user can add database points to the UI and arrange them and format them as they want. If a new point is added to the database they can right click on the UI and say "add this point" and choose from a list of database points. I'm looking for some pointers on where to start on creating this editor application, could something clever be done using XAML to dynamically create std WPF controls at runtime? Thanks in advance for any help, Si

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• creating a custom user interface in WPF

  - by CSharpInquisitor

  I have a SQL database holding a number of numeric and text values that get updated regularly. The exact number/type/names of these data points can change depending on the source of the database writes. I would like to create a user interface editor, where the user can add database points to the UI and arrange them and format them as they want. If a new point is added to the database they can right click on the UI and say "add this point" and choose from a list of database points. I'm looking for some pointers on where to start on creating this editor application, could something clever be done using XAML to dynamically create std WPF controls at runtime?

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• [C#] Implementing different windows/forms in a Windows Mobile application?

  - by pbean

  I am a bit new to Windows Mobile (with C# and the compact framework) development, so I am kind of unsure how to do this. The user has to go through several pages of information in a wizard-like manner. At the start there is a login window. How would I go about and implement this? Would I just have different User Controls for each page and create/show and destroy/hide them on request? Or do I need to create different forms and somehow show those?

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• Selecting radiobuttons populated within asp.net RadioButtonList with jQuery

  - by user194881

  Hello and thanks in advance for the communal help I always find here. I have been tinkering around with what should seem a pretty straight forward task even for a jQuery newb as myself. I have a radiobuttonlist control bound to a collection: <asp:RadioButtonList ID="radBtnLstPackageSelector" runat="server" CssClass="PackageS"> </asp:RadioButtonList> My form does have several other controls of the same type; Now, the challenge is to select and wire up a on Click event for every radiobutton from the radBtnLstPackageSelector. I have tried several approaches such as: var results1 = $(".PackageS").children("input"); var results1 = $(".PackageS").children("input[type=radiobutton"); var results1 = $("table.PackageS > input[type=radiobutton"); with no luck... Your help would be great right now! ~m

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• How to retrieve value from asp.net textbox from javascript?

  - by Clean

  Hi, I have an asp.net web form with a couple of asp.net textbox controls: <asp:TextBox ID="txtTextBox" runat="server" /> . I have a javascript file tools.js that are included in the page: <script src="tools.js" type="text/javascript"></script> How can I access the value from txtTextBox from javascript? Ive tried using document.getElementById('<%= txtTextBox.ClienID %>').value; document.getElementById('<%= txtTextBox.UniqueID %>').value; document.getElementById('<%= txtTextBox %>').value; but none of them works. Any ideas?

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• Rails 4 testing bug?

  - by Jamato

  Situation: if we add two identic line items into a cart, we update line item quantity instead of adding a duplicate.In browser everything works fine but in unit testing section something fails because of an empty cycle in code. Which I wanted to use to update all prices. Why? Is that a unit test engine bug? LineItem.all and cart.line_items in process of testing produce two DIFFERENT structures. #<LineItem id: 980190964, product_id: 1, cart_id: 999, created_at: "2014-06-01 00:21:28", updated_at: "2014-06-01 00:21:28", quantity: 2, price: #<BigDecimal:ba0fb544,'0.4E1',9(27)>> #<LineItem id: 980190964, product_id: 1, cart_id: 999, created_at: "2014-06-01 00:21:28", updated_at: "2014-06-01 00:21:28", quantity: 1, price: #<BigDecimal:ba0d1b04,'0.4E1',9(27)>> cart.line_items guy did not update quantity Code itself (produces LineItem which is then saved in line_item_controller which calls this method) class Cart < ActiveRecord::Base has_many :line_items, dependent: :destroy def add_product(product_id) # LOOK THIS CYCLE BREAKS UNIT TEST, SRSLY, I MEAN IT line_items.each do |item| end current_item = line_items.find_by(product_id: product_id) fresh_price = Product.find_by(id: product_id).price if current_item current_item.quantity += 1 else current_item = line_items.build(product_id: product_id, price: fresh_price) end return current_item end ... Unit test code test "non-unique item added" do cart = Cart.new(:id => 999) line_item0 = cart.add_product(2) line_item0.save line_item1 = cart.add_product(1) line_item1.save assert_equal 2, cart.line_items.size #success line_item2 = cart.add_product(1) line_item2.save assert_equal 2, cart.line_items.size, "what?" assert cart.total_price > 15 #fail, prices are not enough, quantity of product1 = 1 #we get total price from quantity, it's a simple method in model end And once again: IT DOES WORK in browser as it should. Even with cycle. I feel so dumb right now...

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• Java Pack No Resize

  - by ikurtz

  i am learning Java at the moment and have the following question: i am adding my controls to JFrame and then pack() before displaying. this runs the application and all is very nice. i was wondering is there a way to stop the user from resizing the application window? also is there a way to for the image in JLabel to expand as the user changes the application window? at the moment i have it as: constraints.fill = GridBagConstraints.BOTH; constraints.anchor = GridBagConstraints.CENTER; and it only centers the image, i would like to be able to expand/shrink the image. thanks.

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• Is it possible to make a TListView search by the caption of a different column in Delphi?

  - by James

  Hi, When you set the Caption of a TListItem it seems to always set the Text for the first column in the row. When you start typing in the ListView it will search & select the closest match based on the caption of the first column. I have a situation where I need the caption of the first row to be empty, but still need the search functionality to work as normal (in this case the data I would be searching for may be in the 2nd/3rd column). Is this possible without using any 3rd party controls?

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• Get width of DataGridView Column When AutoGenerateColumns = true And It added dynomically?

  - by n H

  I want to get width of each column of DataGridView in codeBehinde after setting DataSource and before showing it to user: DataGridView dgv = new DataGridView(); dgv.AutoGenerateColumns = true; dgv.AutoSizeColumnsMode = DataGridViewAutoSizeColumnsMode.AllCells; dgv.AutoSize = true; dgv.DataSource = dc.Branches.ToList(); this.Controls.Add(dgv); //How to get Width of each Column Here?? var ColCount = dgv.Columns.Count; //return 0 ??

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