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• how to display the listbox items to a label using VB2008

  - by Cecilia

  I am trying to display listbox items in a label. After debugging,I get the error : " make sure that the maximun index on the list is less than the list size" any comment will be highly appreciate, Private Sub xMultiButton_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) _ Handles xMultiButton.Click Dim count As Integer count = Me.xNamesListBox.Items.Count For count = 0 To 3 Me.xResultLabel.Text = Me.xNamesListBox.SelectedItems.Item(0).ToString & ControlChars.NewLine _ & Me.xNamesListBox.SelectedItems.Item(1).ToString & ControlChars.NewLine _ & Me.xNamesListBox.SelectedItems.Item(2).ToString & ControlChars.NewLine _ & Me.xNamesListBox.SelectedItems.Item(3).ToString & ControlChars.NewLine _ & Me.xNamesListBox.SelectedItems.Item(4).ToString Next End Sub

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• Ruby on Rails: how to sort data in an array of active record objects right before iterating?

  - by DerNalia

  What is the best way to sort an array of active record objects by by a field? This array is a field of an object, link_pages, and I want it sorted by the field "sequence" <% @menu_bar.link_pages.each do |lp| %> <li id="page_<%= lp.id%>" class="ui-state-default"> <span class="ui-icon ui-icon-arrowthick-2-n-s"></span> <font size=5><%= lp.name %></font> | <%= link_to "remove", :controller => "admin/menu_bars", :action => :remove_page_from_menu, :page => lp.id, :id => @menu_bar.id %> </li> <% end %> maybe there is a way to do @menu_bar.link_pages.sort_by_sequence.each do .... that would be slick... but I just don't know.

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• DataGridView and the CellEndEdit Event

  - by Brandon

  I have a DataGridView, and would like to hook into the CellEndEdit event. I've been able to successfully hook into the CellContentClick event, but am having issues with CellEndEdit. I added the following code to my Form1.cs file: private void dataGridView1_CellEndEdit(object sender, DataGridViewCellCancelEventArgs e) { dataGridView1[0, 0].Value = "Changed"; } With that code, nothing happens when I am done editing a cell. Is there anything else that I need to do to successfully hook into this event? I see that CellContentClick has a this.dataGridView1.CellContentClick += new System.Windows.Forms.DataGridViewCellEventHandler(this.dataGridView1_CellContentClick); line of code in the Form1.Designer.cs file, but I tried to mimic this for CellEndEdit, and received a compile error (No overload for 'dataGridView1_CellEndEdit' matches delegate 'System.Windows.Forms.DataGridViewCellEventHandler')

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• Group and count in Rails

  - by alamodey

  I have this bit of code and I get an empty object. @results = PollRoles.find( :all, :select => 'option_id, count(*) count', :group => 'option_id', :conditions => ["poll_id = ?", @poll.id]) Is this the correct way of writing the query? I want a collection of records that have an option id and the number of times that option id is found in the PollRoles model. EDIT: This is how I''m iterating through the results: <% @results.each do |result| %> <% @option = Option.find_by_id(result.option_id) %> <%= @option.question %> <%= result.count %> <% end %>

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• gridview databind

  - by frenchie

  Hi, I'm doing a gridview with an object datasource: List<MyObject> TheSource = a linq query At some point, I have MyGridview.DataSource = TheSource; MyGridview.Databind(); and an OnRowDataBound event handler that's tied to the databinding. In that event handler, how do you make column 2 contain 2 objects from TheSource. For instance, in the TheSource, there is a variable for FirstName and another one for LastName. Column 2 needs to contain both the first and last name in the same cell. Thanks.

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• How to test soft deletion event listner without setting up NHibernate Sessions

  - by isuruceanu

  I have overridden the default NHibernate DefaultDeleteEventListener according to this source: http://nhforge.org/blogs/nhibernate/archive/2008/09/06/soft-deletes.aspx so I have protected override void DeleteEntity( IEventSource session, object entity, EntityEntry entityEntry, bool isCascadeDeleteEnabled, IEntityPersister persister, ISet transientEntities) { if (entity is ISoftDeletable) { var e = (ISoftDeletable)entity; e.DateDeleted = DateTime.Now; CascadeBeforeDelete(session, persister, entity, entityEntry, transientEntities); CascadeAfterDelete(session, persister, entity, transientEntities); } else { base.DeleteEntity(session, entity, entityEntry, isCascadeDeleteEnabled, persister, transientEntities); } } How can I test only this piece of code, without configuring an NHIbernate Session?

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• UIComponent's width and height have no effect on Sprite

  - by flexwheel

  Given this code: var circle:Sprite = new Sprite(); circle.graphics.beginFill(0xFFCC00); circle.graphics.drawCircle(0, 0, 20); var uiComp:UIComponent = new UIComponent(); uiComp.x = 100; uiComp.y = 100; uiComp.measuredHeight = 0; uiComp.measuredWidth = 0; uiComp.addChild(circle); addChild(uiComp); Why does changing the width and height of uiComp not affect the Sprite? Wouldn't UIComponent provide Sprite with a Graphics object, which limits that area where Sprite can draw?

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• How are managed the sequences by JPA and Hibernate?

  - by romaintaz

  Hi all, I am using Hibernate in my project, and many of my entities use a sequence for their technical keys. For example: @Entity @Table(name = "T_MYENTITY") @SequenceGenerator(name = "S_MYENTITY", sequenceName = "S_MYENTITY") public class MyEntity { @Id @GeneratedValue(strategy = GenerationType.SEQUENCE, generator = "S_MYENTITY") @Column(name = "MY_ENTITY_ID") private Long entityId; ... } I have two questions about the ID generated by Hibernate when a new object of this class is persisted: Why SequenceGenerator (from javax.persistence) has a default value of allocationSize set to 50 instead of 1? What are the interests of that? What is the default algorithm used by Hibernate to calculate the generated ID? It seems that Hibernate uses the value returned by the sequence hosted by my Oracle database, but then modify it before assigning it to my entity...

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• respond_to? and protected methods

  - by mlomnicki

  It may not be so obvious how respond_to? works in ruby. Consider that: class A def public_method end protected def protected_method end private def private_method end end obj = A.new obj.respond_to?(:public_method) # true - that's pretty obvious obj.respond_to?(:private_method) # false - as expected obj.respond_to?(:protected_method) # true - WTF? So if 'obj' responds to protected_method we should expect obj.protected_method not to raise an exception, shouldn't we? ...but it raises obviously Documentation points that calling respond_to? with 2nd argument set to true check private method as well obj.respond_to?(:private_method, true) # true And that's far more reasonable So the question is how to check if object responds to public method only? Is there a solution better than that? obj.methods.include?(:public_method) # true obj.methods.include?(:protected_method) # false

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• stop cript debug error dialogs occur in ie8 ?

  - by Haroldo

  I get this, clicking 'no' means the page displays flawlessly. it's refering to this part of jquery1.4.2.js: // Get the Nth element in the matched element set OR // Get the whole matched element set as a clean array get: function( num ) { return num == null ? // Return a 'clean' array this.toArray() : // Return just the object ( num < 0 ? this.slice(num)[ 0 ] : this[ num ] ); }, I assume i'm calling something in the wrong context somewhere in one of my js files (which would be a real mission to find). Will standard IE8 users get this error? (i imagine ms make it pretty difficult to reinstall ie!)

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• Delay the display of image loaded using jquery + ajax

  - by niczoom

  I am using the following code : $.ajax({ url: "pgiproxy.php", data: ({ data : $("#formdata").serialize(), mode : "graph"}), success: function(result){ var temp = $('<div/>').html(result); var val = temp.find('center').html(); $('#BFX').html(val); }, error: function(){ $("#error").html("ERROR !!!"); } }); The 'result' from the ajax call to 'pgiproxy.php' is a whole web page (returned as a string), this is then converted to a jQuery object and stored in 'var'. I then extract the data I need (a .gif image) using .find() which is stored in 'val'. This image is then inserted into a #BFX div for display. My problem is every successive time I click my button to update this image it shows the image loading from top to bottom as it is reading it in from the web. Is there a way to only display this image once it has fully loaded so the user doesnt see the image loading and only sees the image change instantly.

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• Tag property null when data binding

  - by rotary_engine

  Can anyone see what is wrong with this? The Tag property is returning null however the Binding for Id property is definately returning an int value. <ListBox ItemsSource="{Binding ElementName=myDomainDataSource, Path=Data}"> <ListBox.ItemTemplate> <DataTemplate> <StackPanel Orientation="Horizontal"> <TextBlock Text="{Binding Path=Id, Mode=OneWay}" /> <HyperlinkButton Content="Edit" Tag="{Binding ElementName=Id, Mode=OneWay}" Click="Edit_Click" /> </StackPanel> </DataTemplate> </ListBox.ItemTemplate> </ListBox> and then... private void Edit_Click(object sender, RoutedEventArgs e) { ContentControl c = sender as ContentControl; // exception - c.Tag is null int id = (int)c.Tag; } The Id property is showing a value on the UI, but doesn't seem to be getting stored in the buttons Tag property.

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• javascript inserting html code

  - by Marius

  Hello, I have a situation when there's a table and you can add a new row by clicking a button. The row is dynamically generated by a server and it is passed back in HTML. So basically what i need to do is prefix the new row to the old table. Something like this: tableelement.innerHTML = newHtml + tableelement.innerHTML; That surely works, but i have a table header and, obviously, i need to insert the new html after it. How would i do this? insertBefore or insertAfter can't help (afaik), because they're meant for inserting elements and not unparsed HTML. So how could i, having an object of the header's row, insert another row (in HTML) after it (or before) ? Thank you for your ideas

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• Hibernate mapping to manage bidirectional relationship using intermediate table

  - by shikarishambu

  I have an object hierarchy that is as follows. Party inherited by Organization and Person Organization inherited by Customer, Vendor Person inherited by Contact In the database I have the following tables Party, Customer, Vendor, Contact. All of them have a corresponding row in Party table. Contact belongs to either Vendor or Customer. I have a field on the Contact table for org_party_id. However, since the organization can be either a Customer or Vendor I need to be able to look at different tables. Is there a way to map this in hibernate? Or, a better way to manage it in DB/ hibernate?

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• Clear sqlalchemy reflection cache

  - by OrganicPanda

  Hi all, I'm using sqlalchemy's reflection tools to get a Table object. I do this because these tables are dynamic and tables/columns can change. Here's the code I'm using: def getTableByReflection(self, tableName, metadata, engine): return Table(tableName, metadata, autoload = True, autoload_with = engine) The problem is that when the above code is run twice it seems to return the same results regardless of whether or not the columns have changed. I have tried refreshing using the mysession.refresh(mytable) but that fails because the table is not attached to any metadata - which makes sense but then why am I seeing cached results? Is there any way to tell the metadata/engine/session to forget about this table and let me load it cleanly?

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• C# Serial Communications - Received Data Lost

  - by Jim Fell

  Hello. Received data in my C# application is getting lost due to the collector array being over-written, rather than appended. private void serialPort1_DataReceived(object sender, SerialDataReceivedEventArgs e) { try { pUartData_c = serialPort1.ReadExisting().ToCharArray(); bUartDataReady_c = true; } catch ( System.Exception ex ) { MessageBox.Show(ex.Message, "Error", MessageBoxButtons.OK, MessageBoxIcon.Error); } } In this example pUartData_c is over-written every time new data is received. On some systems this is not a problem because the data comes in quickly enough. However, on other systems data in the receive buffer is not complete. How can I append received data to pUartData_c, rather than over-write it. I am using Microsoft Visual C# 2008 Express Edition. Thanks.

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• Create a class with array of objects.

  - by Bi

  Hi Code below defines a ChargeCustomer class that contains an array of type "customers". I want to be able to create an object with either 1 "customer" or 2 "customers" based on the constructor parameters. Is this the right way to do so in C#: public class ChargeCustomer { private Customer[] customers; public ChargeCustomer( string aName, string bName, int charge ) { customers = new Customer[2]; customers[0] = new Customer(aName, charge); customers[1] = new DropBox(bName, charge); } public ChargeCustomer( string bName, int charge ) { customers = new Customer[1]; customers[0] = new Customer( bName, charge ); } } Thanks!

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• [C#] How to share a variable between two classes?

  - by Altefquatre

  Hello, How would you share the same object between two other objects? For instance, I'd like something in that flavor: class A { private string foo_; // It could be any other class/struct too (Vector3, Matrix...) public A (string shared) { this.foo_ = shared; } public void Bar() { this.foo_ = "changed"; } } ... // inside main string str = "test"; A a = new A(str); Console.WriteLine(str); // "test" a.Bar(); Console.WriteLine(str); // I get "test" instead of "changed"... :( I read there is some ref/out stuff, but I couldn't get what I'm asking here. I could only apply some changes in the methods scope where I was using ref/out arguments... I also read we could use pointers, but is there no other way to do it? Thanks Altefquatre

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• [jquery] return the inserted element

  - by Quamis

  Hello, i'm pretty new to jquery. I'm trying to insert an element to the DOM, and get that element back in my script. Ex: var elem = $("body").append(""); $(elem).show(); but it seems that .append returns the whole jQuery object.. am i supposed to use an ID for the inserted element and always reference it by it?? i really hope that there is a smarter move here. I'm used to do it like that from Prototype..

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• NoneType has no attribute Append

  - by Rosarch

  I'm new to Python. I can't understand why a variable is None at a certain point in my code: class UsersInRoom(webapp.RequestHandler): def get(self): room_id = self.request.get("room_id") username = self.request.get("username") UserInRoom_entities = UserInRoom.gql("WHERE room = :1", room_id).get() if UserInRoom_entities: for user_in_room in UserInRoom_entities: if user_in_room.username == username: user_in_room.put() # last_poll auto updates to now whenenever user_in_room is saved else: user_in_room = UserInRoom() user_in_room.username = username user_in_room.put() UserInRoom_entities = [] UserInRoom_entities.append(user_in_room) // error here # name is `user_at_room` intead of `user_in_room` to avoid confusion usernames = [user_at_room.username for user_at_room in UserInRoom_entities] self.response.out.write(json.dumps(usernames)) The error is: Traceback (most recent call last): File "C:\Program Files\Google\google_appengine\google\appengine\ext\webapp\__init__.py", line 507, in __call__ handler.get(*groups) File "path\to\chat.py", line 160, in get AttributeError: 'NoneType' object has no attribute 'append' How is this possible? I'm setting UserInRoom_entities = [] immediately before that call. Or is something else the None in question?

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• Is `eval`ing in a CPAN module without localizing $@ a bug?

  - by rassie

  I think I've encountered a bug in Params::Validate, but I'm not sure whether I identified the problematic code piece correctly. The code in question failed to pass exceptions up the chain (using Try::Tiny), so I started debugging and found out that a class used inside the try block has a destructor. This destructor calls object methods which use Params::Validate and looking into Validate.pm source I see an eval without $@ localization, i.e. the global $@ gets overwritten. Now I see two options: Params::Validate should always localize $@ and thus it's a bug that should be reported. The bug is in the class in question, because it shouldn't use Params::Validate in a destructor. Params::Validate can stay as it is now. Which one is it? How I should I handle this situation? PS: I think that CPAN modules should be rock-solid and neither break themselves nor their environment, hence the question title.

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• custom Filter Android won't show me the results

  - by TiGer

  Hi, I have been implementing a class which class extends ArrayAdapter and implements Filterable. The filtering part (in the performFiltering method()) seems to go ok, it fills the FilterResults object just as expected. But then I think I'm not doing it right on how to publish the results, atm I have : protected void publishResults(CharSequence prefix, FilterResults results) { // NOTE: this function is *always* called from the UI thread. subItems = (Vector)results.values; notifyDataSetChanged(); } But this simply won't "populate" my List with the received data. So now my question is how do I populate my List with the received results ? Do I have to do that programmatically ?

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• WPF List of ViewModels bound to list of Model objects.

  - by Eric

  In the model, I have: public ObservableCollection<Item> Items { get; private set; } In the ViewModel, I have a corresponding list of ItemViewModels: public ObservableCollection<ItemViewModel> ItemViewModels ... In the XAML, I will bind (in this case a TreeView) to the ItemViewModels property. My question is, what goes in the "..." in the ViewModel shown above? I am hoping for a line or two of code to binds these two ObservableCollections (providing the type of the ViewModel to construct for each model object). However, what I'm fearing is necessary is a bunch of code to handle the Items.CollectionChanged event and manually updates the ItemViewModels list by constructing ViewModels as necessary. Thanks! Eric

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• crash in the handler that moves up a treenode in a treeview c#

  - by voodoomsr

  i have a event handler that moves the selected treenode up. I don't know why is crash in the line with comented. treeviewdocxml is a treeview object, from System.Windows.Forms treeViewDocXml.BeginUpdate(); TreeNode sourceNode = treeViewDocXml.SelectedNode; if (sourceNode.Parent == null) { return; } if (sourceNode.Index > 0) { sourceNode.Parent.Nodes.Remove(sourceNode); sourceNode.Parent.Nodes.Insert(sourceNode.Index - 1, sourceNode); //HERE CRASH } treeViewDocXml.EndUpdate();

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• WPF C#: Starting crash due to client 'Region and Language' settings

  - by FrieK

  Hi, I'm working on a WPF C# application, and it seems to crash with a few random people. So eventually I found out it was the 'Region and Language' settings that was responsible. For example, if I were to set my Format to English (United States) it will work, if I set it to Swedish (Sweden) it will crash from the start. When I test this in Visual Studio 2010 it gives error 'TypeInitializationException'. More precisely it does it here (it doesn't get passed the InitializeComponent() void): private void RadioButton_Checked(object sender, RoutedEventArgs e) { Info.SortOrder = SortBy.Rank; } It claims the error at the first line, which is just setting an enum value to a variable. I guess it's just doing it there because it's the first thing it makes, or something. Anyone has any idea how to fix this? I've searched around but can't seem to find out how :( Any help is much appreciated! Thanks

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