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• Tactics for using PHP in a high-load site

  - by Ross

  Before you answer this I have never developed anything popular enough to attain high server loads. Treat me as (sigh) an alien that has just landed on the planet, albeit one that knows PHP and a few optimisation techniques. I'm developing a tool in PHP that could attain quite a lot of users, if it works out right. However while I'm fully capable of developing the program I'm pretty much clueless when it comes to making something that can deal with huge traffic. So here's a few questions on it (feel free to turn this question into a resource thread as well). Databases At the moment I plan to use the MySQLi features in PHP5. However how should I setup the databases in relation to users and content? Do I actually need multiple databases? At the moment everything's jumbled into one database - although I've been considering spreading user data to one, actual content to another and finally core site content (template masters etc.) to another. My reasoning behind this is that sending queries to different databases will ease up the load on them as one database = 3 load sources. Also would this still be effective if they were all on the same server? Caching I have a template system that is used to build the pages and swap out variables. Master templates are stored in the database and each time a template is called it's cached copy (a html document) is called. At the moment I have two types of variable in these templates - a static var and a dynamic var. Static vars are usually things like page names, the name of the site - things that don't change often; dynamic vars are things that change on each page load. My question on this: Say I have comments on different articles. Which is a better solution: store the simple comment template and render comments (from a DB call) each time the page is loaded or store a cached copy of the comments page as a html page - each time a comment is added/edited/deleted the page is recached. Finally Does anyone have any tips/pointers for running a high load site on PHP. I'm pretty sure it's a workable language to use - Facebook and Yahoo! give it great precedence - but are there any experiences I should watch out for? Thanks, Ross

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• how to display image in repeater after AJAX AsyncFileUpload ?

  - by Gordon Shamway

  Hello i am using the AsyncFileUpload from the ajaxtoolkit, upter the upload is complete , i want to display all the images that were uploaded (and their URL is inserted into the DB) with my repeater and binding method. but its not working! the images are uploaded, the DB insert works file, but i cant see the images after the repeater is dinded. (i have to mention that if i go step by step, i do see that the ITEMBOUND is being binded and executed) <ajax:TabContainer runat="server" ID="testTab"> <ajax:TabPanel runat="server" ID="testTabContainer"> <ContentTemplate> <ajax:AsyncFileUpload ID="uploadAsyncImage" runat="server" OnUploadedComplete="InsertToTemp" ThrobberID="Throbber"/> <asp:Label ID="Throbber" runat="server" Style="display: none"> <img src="Images/indicator.gif" align="absmiddle" alt="loading" /> </asp:Label> <br /> <asp:UpdatePanel runat="server" ID="pnlImages" UpdateMode="Conditional" ChildrenAsTriggers="true"> <ContentTemplate> <asp:Repeater runat="server" ID="rptImages" > <ItemTemplate> <a href="<%# DataBinder.Eval(Container.DataItem, "PicURL")%>" rel="lightbox"> <asp:Image ImageUrl='<%# DataBinder.Eval(Container.DataItem, "PicURL")%>' Width="50" Height="50" runat="server" ID="testPic" /> </a> </ItemTemplate> </asp:Repeater> </ContentTemplate> </asp:UpdatePanel> </ContentTemplate> </ajax:TabPanel> </ajax:TabContainer> </form> also adding my Code Behind, since it might be important or will help you get an idea of what i am trying to do.private void BindRepater() { ProjDataContext db = DbContext.DbContextProvider(); var pic = from p in db.TempProdCats where p.SessionID == Session.SessionID.ToString() select new { PicURL = p.PicURL }; rptImages.DataSource = pic; rptImages.DataBind(); pnlImages.Update(); } protected void rptImages_ItemDataBound(object sender, RepeaterItemEventArgs e) { if (e.Item.ItemType == ListItemType.Item || e.Item.ItemType == ListItemType.AlternatingItem) { Image lblCat = (Image)e.Item.FindControl("testPic"); lblCat.ImageUrl = (string)DataBinder.Eval(e.Item.DataItem, "PicURL"); pnlImages.Update(); } } your help will be highly appreciated , if any of you got any idea how to make it work...

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• How much abstraction is too much?

  - by Daniel Bingham

  In an Object Oriented Program: How much abstraction is too much? How much is just right? I have always been a nuts and bolts kind of guy. I understood the concept behind high levels of encapsulation and abstraction, but always felt instinctively that adding too much would just confuse the program. I always tried to shoot for an amount of abstraction that left no empty classes or layers. And where in doubt, instead of adding a new layer to the hierarchy, I would try and fit something into the existing layers. However, recently I've been encountering more highly abstracted systems. Systems where everything that could require a representation later in the hierarchy gets one up front. This leads to a lot of empty layers, which at first seems like bad design. However, on second thought I've come to realize that leaving those empty layers gives you more places to hook into in the future with out much refactoring. It leaves you greater ability to add new functionality on top of the old with out doing nearly as much work to adjust the old. The two risks of this seem to be that you could get the layers you need wrong. In this case one would wind up still needing to do substantial refactoring to extend the code and would still have a ton of never used layers. But depending on how much time you spend coming up with the initial abstractions, the chance of screwing it up, and the time that could be saved later if you get it right - it may still be worth it to try. The other risk I can think of is the risk of over doing it and never needing all the extra layers. But is that really so bad? Are extra class layers really so expensive that it is much of a loss if they are never used? The biggest expense and loss here would be time that is lost up front coming up with the layers. But much of that time still might be saved later when one can work with the abstracted code rather than more low level code. So when is it too much? At what point do the empty layers and extra "might need" abstractions become overkill? How little is too little? Where's the sweet spot? Are there any dependable rules of thumb you've found in the course of your career that help you judge the amount of abstraction needed?

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• ASP.Net Web Farm Monitoring

  - by cisellis

  I am looking for suggestions on doing some simple monitoring of an ASP.Net web farm as close to real-time as possible. The objectives of this question are to: Identify the best way to monitor several Windows Server production boxes during short (minutes long) period of ridiculous load Receive near-real-time feedback on a few key metrics about each box. These are simple metrics available via WMI such as CPU, Memory and Disk Paging. I am defining my time constraints as soon as possible with 120 seconds delayed being the absolute upper limit. Monitor whether any given box is up (with "up" being defined as responding web requests in a reasonable amount of time) Here are more details, things I've tried, etc. I am not interested in logging. We have logging solutions in place. I have looked at solutions such as ELMAH which don't provide much in the way of hardware monitoring and are not visible across an entire web farm. ASP.Net Health Monitoring is too broad, focuses too much on logging and is not acceptable for deep analysis. We are on Amazon Web Services and we have looked into CloudWatch. It looks great but messages in the forum indicate that the metrics are often a few minutes behind, with one thread citing 2 minutes as the absolute soonest you could expect to receive the feedback. This would be good to have for later analysis but does not help us real-time Stuff like JetBrains profiler is good for testing but again, not helpful during real-time monitoring. The closest out-of-box solution I've seen is Nagios which is free and appears to measure key indicators on any kind of box, including Windows. However, it appears to require a Linux box to run itself on and a good deal of manual configuration. I'd prefer to not spend my time mining config files and then be up a creek when it fails in production since Linux is not my main (or even secondary) environment. Are there any out-of-box solutions that I am missing? Obviously a windows-based solution that is easy to setup is ideal. I don't require many bells and whistles. In the absence of an out-of-box solution, it seems easy for me to write something simple to handle what I need. I've been thinking a simple client-server setup where the server requests a few WMI metrics from each client over http and sticks them in a database. We could then monitor the metrics via a query or a dashboard or something. If the client doesn't respond, it's effectively down. Any problems with this, best practices, or other ideas? Thanks for any help/feedback.

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• WPF - Redrawing a Context Menu when Items change?

  - by Rachel

  I have a ItemsControl in a ScrollViewer, and when the items exceed the width of the ScrollViewer they are put into a ContextMenu and shown as a DropDown instead. My problem is that when the Context Menu is first loaded, it saves the saves the size of the Menu and does not redraw when more commands get added/removed. For example, a panel has 3 commands. 1 is visible and 2 are in the Menu. Viewing the menu shows the 2 commands and draws the control, but then if you resize the panel so 2 are visible and only 1 command is in the menu, it doesn't redraw the menu to eliminate that second menu item. Or even worse, if you shrink the panel so that no commands are shown and all 3 are in the Menu, it will only show the top 2. Here's my code: <Button Click="DropDownMenu_Click" ContextMenuOpening="DropDownMenu_ContextMenuOpening"> <Button.ContextMenu> <ContextMenu ItemsSource="{Binding Path=MenuCommands}" Placement="Bottom"> <ContextMenu.Resources> <Style TargetType="{x:Type MenuItem}"> <Setter Property="Command" Value="{Binding Path=Command}" /> <Setter Property="Visibility" Value="{Binding Path=IsVisible, Converter={StaticResource ReverseBooleanToVisibilityConverter}}"/> </Style> </ContextMenu.Resources> <ContextMenu.ItemTemplate> <DataTemplate> <TextBlock Text="{Binding Path=DisplayName}" /> </DataTemplate> </ContextMenu.ItemTemplate> </ContextMenu> </Button.ContextMenu> </Button> Code Behind: void DropDownMenu_ContextMenuOpening(object sender, ContextMenuEventArgs e) { Button b = sender as Button; b.ContextMenu.IsOpen = false; e.Handled = true; } private void DropDownMenu_Click(object sender, RoutedEventArgs e) { Button b = sender as Button; ContextMenu cMenu = b.ContextMenu; if (cMenu != null) { cMenu.PlacementTarget = b; cMenu.Placement = System.Windows.Controls.Primitives.PlacementMode.Bottom; } } I have tried using InvalidateVisual and passing an empty delegate on Render to try and force a redraw, however neither works. I'm using .Net 4.0.

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• Microsoft Charting Histogram Zero With Line

  - by Brownman98

  I am currently developing an application that uses chart control to create a histogram. The histogram displays data correctly however I would like to center the data. Right now the Min and Max are automatically set. I would like the graph to always force its to be displayed symmetrically. Here is an example of what I'm trying to accomplish. Basically I would like it to look like a normal distribution graph. Does anyone know how I can do the the following: Get the graph to be displayed symmetrically? Always show a zero line. Here is the aspx markup. <asp:Chart ID="ChartHistogram" runat="server" Height="200" Width="300"> <Series> <asp:Series Name="SeriesDataHistogram" ChartType="RangeColumn" Color="#4d5b6e" BorderColor="#ffffff" BorderDashStyle="NotSet"> </asp:Series> </Series> <ChartAreas> <asp:ChartArea Name="ChartAreaMain" BorderColor="#CCCCCC"> <AxisX TitleFont="Arial, 7pt" LabelAutoFitMaxFontSize="7"> <MajorGrid LineColor="#FFFFFF" Interval="5" /> <LabelStyle Format="P1" /> </AxisX> <AxisY Title="Frequency" TitleFont="Arial, 7pt" LabelAutoFitMaxFontSize="7"> <MajorGrid LineColor="#FFFFFF" /> </AxisY> </asp:ChartArea> </ChartAreas> </asp:Chart> Here is the code behind private void DrawHistogram(List<ReturnDataObject> list) { foreach (ReturnDataObject r in list) this.ChartHistogram.Series["SeriesDataHistogram"].Points.AddY(r.ReturnAmount); // HistogramChartHelper is a helper class found in the samples Utilities folder. HistogramChartHelper histogramHelper = new HistogramChartHelper(); // Show the percent frequency on the right Y axis. histogramHelper.ShowPercentOnSecondaryYAxis = false; // Create histogram series histogramHelper.CreateHistogram(ChartHistogram, "SeriesDataHistogram", "Histogram"); } Thanks for any help.

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• asp.net CustomValidator never fires OnServerValidate

  - by Bryce Fischer

  I have the following ASP page: <asp:Content ID="Content2" ContentPlaceHolderID="ShellContent" runat="server"> <form runat="server" id="AddNewNoteForm" method="post""> <fieldset id="NoteContainer"> <legend>Add New Note</legend> <asp:ValidationSummary ID="ValidationSummary1" runat="server" /> <div class="ctrlHolder"> <asp:Label ID="LabelNoteDate" runat="server" Text="Note Date" AssociatedControlID="NoteDateTextBox"></asp:Label> <asp:TextBox ID="NoteDateTextBox" runat="server" class="textInput" CausesValidation="True" ></asp:TextBox> <asp:CustomValidator ID="CustomValidator1" runat="server" ErrorMessage="CustomValidator" ControlToValidate="NoteDateTextBox" OnServerValidate="CustomValidator1_ServerValidate" Display="Dynamic" >*</asp:CustomValidator> </div> <div class="ctrlHolder"> <asp:Label ID="LabelNoteText" AssociatedControlID="NoteTextTextBox" runat="server" Text="Note"></asp:Label> <asp:TextBox ID="NoteTextTextBox" runat="server" Height="102px" TextMode="MultiLine" class="textInput" ></asp:TextBox> <asp:RequiredFieldValidator ID="RequiredFieldValidator2" runat="server" ErrorMessage="Note Text is Required" ControlToValidate="NoteTextTextBox">*</asp:RequiredFieldValidator> </div> <div class="buttonHolder"> <asp:Button ID="OkButton" runat="server" Text="Add New Note" CssClass="primaryAction" onclick="OkButton_Click"/> <asp:HyperLink ID="HyperLink1" runat="server">Cancel</asp:HyperLink> </div> </fieldset> </form> </asp:Content> and the following code behind for the CustomValidator1_ServerValidate() method: protected void CustomValidator1_ServerValidate(object source, ServerValidateEventArgs args) { if (string.IsNullOrEmpty(args.Value.Trim())) { args.IsValid = false; CustomValidator1.ErrorMessage = "Note Date is Required!"; return; } DateTime testDate; if (DateTime.TryParse(args.Value, out testDate)) { args.IsValid = true; CustomValidator1.ErrorMessage = "Invalid Date!"; } } It never seems to fail validation no matter what I put in the text box... Should mention this is ASP.NET 2.0

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• How to avoid using duplicate savepoint names in nested transactions in nested stored procs?

  - by Gary McGill

  I have a pattern that I almost always follow, where if I need to wrap up an operation in a transaction, I do this: BEGIN TRANSACTION SAVE TRANSACTION TX -- Stuff IF @error <> 0 ROLLBACK TRANSACTION TX COMMIT TRANSACTION That's served me well enough in the past, but after years of using this pattern (and copy-pasting the above code), I've suddenly discovered a flaw which comes as a complete shock. Quite often, I'll have a stored procedure calling other stored procedures, all of which use this same pattern. What I've discovered (to my cost) is that because I'm using the same savepoint name everywhere, I can get into a situation where my outer transaction is partially committed - precisely the opposite of the atomicity that I'm trying to achieve. I've put together an example that exhibits the problem. This is a single batch (no nested stored procs), and so it looks a little odd in that you probably wouldn't use the same savepoint name twice in the same batch, but my real-world scenario would be too confusing to post. CREATE TABLE Test (test INTEGER NOT NULL) BEGIN TRAN SAVE TRAN TX BEGIN TRAN SAVE TRAN TX INSERT INTO Test(test) VALUES (1) COMMIT TRAN TX BEGIN TRAN SAVE TRAN TX INSERT INTO Test(test) VALUES (2) COMMIT TRAN TX DELETE FROM Test ROLLBACK TRAN TX COMMIT TRAN TX SELECT * FROM Test DROP TABLE Test When I execute this, it lists one record, with value "1". In other words, even though I rolled back my outer transaction, a record was added to the table. What's happening is that the ROLLBACK TRANSACTION TX at the outer level is rolling back as far as the last SAVE TRANSACTION TX at the inner level. Now that I write this all out, I can see the logic behind it: the server is looking back through the log file, treating it as a linear stream of transactions; it doesn't understand the nesting/hierarchy implied by either the nesting of the transactions (or, in my real-world scenario, by the calls to other stored procedures). So, clearly, I need to start using unique savepoint names instead of blindly using "TX" everywhere. But - and this is where I finally get to the point - is there a way to do this in a copy-pastable way so that I can still use the same code everywhere? Can I auto-generate the savepoint name on the fly somehow? Is there a convention or best-practice for doing this sort of thing? It's not exactly hard to come up with a unique name every time you start a transaction (could base it off the SP name, or somesuch), but I do worry that eventually there would be a conflict - and you wouldn't know about it because rather than causing an error it just silently destroys your data... :-(

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• TVirtualStringTree - resetting non-visual nodes and memory consumption

  - by Remy Lebeau - TeamB

  I have an app that loads records from a binary log file and displays them in a virtual TListView. There are potentially millions of records in a file, and the display can be filtered by the user, so I do not load all of the records in memory at one time, and the ListView item indexes are not a 1-to-1 relation with the file record offsets (List item 1 may be file record 100, for instance). I use the ListView's OnDataHint event to load records for just the items the ListView is actually interested in. As the user scrolls around, the range specified by OnDataHint changes, allowing me to free records that are not in the new range, and allocate new records as needed. This works fine, speed is tolerable, and the memory footprint is very low. I am currently evaluating TVirtualStringTree as a replacement for the TListView, mainly because I want to add the ability to expand/collapse records that span multiple lines (I can fudge it with the TListView by incrementing/decrementing the item count dynamically, but this is not as straight forward as using a real tree). For the most part, I have been able to port the TListView logic and have everything work as I need. I notice that TVirtualStringTree's virtual paradigm is vastly different, though. It does not have the same kind of OnDataHint functionality that TListView does (I can use the OnScroll event to fake it, which allows my memory buffer logic to continue working), and I can use the OnInitializeNode event to associate nodes with records that are allocated. However, once a tree node is initialized, it sees that it remains initialized for the lifetime of the tree. That is not good for me. As the user scrolls around and I remove records from memory, I need to reset those non-visual nodes without removing them from the tree completely, or losing their expand/collapse states. When the user scrolls them back into view, I can re-allocate the records and re-initialize the nodes. Basically, I want to make TVirtualStringTree act as much like TListView as possible, as far as its virtualization is concerned. I have seen that TVirtualStringTree has a ResetNode() method, but I encounter various errors whenever I try to use it. I must be using it wrong. I also thought of just storing a data pointer inside each node to my record buffers, and I allocate and free memory, update those pointers accordingly. The end effect does not work so well, either. Worse, my largest test log file has ~5 million records in it. If I initialize the TVirtualStringTree with that many nodes at one time (when the log display is unfiltered), the tree's internal overhead for its nodes takes up a whopping 260MB of memory (without any records being allocated yet). Whereas with the TListView, loading the same log file and all the memory logic behind it, I can get away with using just a few MBs. Any ideas?

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• Proxy settings with ivy...

  - by user315228

  Hi, I have an issue where in I have defined dependancies in ivy.xml on our internal corporate svn. I am able to access this svn site without any proxy task in ant. While my dependencies resides on ibiblio, that’s something outside our corporate, and needs proxy inorder to download something. I am facing problem using ivy here: I have following in build.xml <target name="proxy" <property name="proxy.host" value="xyz.proxy.net"/ <property name="proxy.port" value="8443"/ <setproxy proxyhost="${proxy.host}" proxyport="${proxy.port}"/ </target <!-- resolve the dependencies of stratus --> <target name="resolveTestDependency" depends="testResolve, proxy" description="retrieve test dependencies with ivy"> <ivy:settings file="stratus-ivysettings.xml" /> <ivy:retrieve conf="test" pattern="${jars}/[artifact]-[revision].[ext]"/><!--pattern here specifies where do you want to download lib to?--> </target> <target name=" testResolve "> <ivy:settings file="stratus-ivysettings.xml" /> <ivy:resolve conf="test" file="stratus-ivy.xml"/> </target> Following is the excerpt from stratus-ivysettings.xml <resolvers <!-- here you define your file in private machine not on the repo (e.g. jPricer.jar or edgApi.jar)-- <!-- This we will use a url nd not local file system.. -- <url name="privateFS" <ivy pattern="http://xyz.svn.com/ivyRepository/ [organisation]/ivy/ivy.xml"/ </url . . . <url name="public" m2compatible="true" <artifact pattern="http://www.ibiblio.org/maven2/[organisation]/[module]/[revision]/[artifact]-[revision].[ext]"/ </url . . . So as can be seen here for getting ivy.xml, I don’t need any proxy as its within our own network which cant be accesses when I set proxy. But on the other hand I am using ibiblio as well which is external to our network and works only with proxy. So above build.xml wont work in that case. Can somebody help here. I don’t need proxy while getting ivy.xml (as if I have proxy, ivy wont be able to find ivy file behind proxy from within the network), and I just need it when my resolver goes to public url.

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• Proxy settings with ivy...

  - by user315228

  Hi, I have an issue where in I have defined dependancies in ivy.xml on our internal corporate svn. I am able to access this svn site without any proxy task in ant. While my dependencies resides on ibiblio, that’s something outside our corporate, and needs proxy inorder to download something. I am facing problem using ivy here: I have following in build.xml <target name="proxy"> <property name="proxy.host" value="xyz.proxy.net"/> <property name="proxy.port" value="8443"/> <setproxy proxyhost="${proxy.host}" proxyport="${proxy.port}"/> </target> &lt;!-- resolve the dependencies of stratus --&gt; &lt;target name="resolveTestDependency" depends="testResolve, proxy" description="retrieve test dependencies with ivy"&gt; &lt;ivy:settings file="stratus-ivysettings.xml" /> &lt;ivy:retrieve conf="test" pattern="${jars}/[artifact]-[revision].[ext]"/&gt;<!--pattern here specifies where do you want to download lib to?--> </target> <target name=" testResolve "> <ivy:settings file="stratus-ivysettings.xml" /> <ivy:resolve conf="test" file="stratus-ivy.xml"/> </target> Following is the excerpt from stratus-ivysettings.xml <resolvers <!-- here you define your file in private machine not on the repo (e.g. jPricer.jar or edgApi.jar)-- <url name="privateFS" <ivy pattern="http://xyz.svn.com/ivyRepository/[organisation]/ivy/ivy.xml"/ </url . . . <url name="public" m2compatible="true" <artifact pattern="http://www.ibiblio.org/maven2/[organisation]/[module]/[revision]/[artifact]-[revision].[ext]"/ </url . . . So as can be seen here for getting ivy.xml, I don’t need any proxy as its within our own network which cant be accesses when I set proxy. But on the other hand I am using ibiblio as well which is external to our network and works only with proxy. So above build.xml wont work in that case. Can somebody help here. I don’t need proxy while getting ivy.xml (as if I have proxy, ivy wont be able to find ivy file behind proxy from within the network), and I just need it when my resolver goes to public url.

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• z-index issues with jQuery Tabs, Superfish Menu

  - by NightMICU

  Hi all, For the life of me I cannot get my Superfish menu to stop hiding behind my jQuery UI tabs in IE 7. I have read the documentation out there, have tried changing z-index values and tried the bgIframe plugin, although I am not sure if I am implementing it correctly (left out in my example below, using Supersubs). Here is the Javascript I am using for Superfish - using the Supersubs plugin: $(document).ready(function() { $("ul.sf-menu").supersubs({ minWidth: 12, // minimum width of sub-menus in em units maxWidth: 27, // maximum width of sub-menus in em units extraWidth: 1 // extra width can ensure lines don't sometimes turn over // due to slight rounding differences and font-family }).superfish({ delay: 1000, // one second delay on mouseout animation: {opacity:'show',height:'show'}, // fade-in and slide-down animation speed: 'medium' // faster animation speed }); }); And here is the structure of my page: <div id="page-container"> <div id="header"></div> <div id="nav-admin"> <!-- This is where Superfish goes --> </div> <div id="header-shadow"></div> <div id="content"> <div id="admin-main"> <div id="tabs"> <ul> <li><a href="#tabs-1">Tab 1</a></li> <li><a href="#tabs-2">Tab 2</a></li> </ul> <div id="tabs-1"> <!-- Content for Tab 1 --> </div> <div id="tabs-2"> <!-- Content for Tab 2 --> </div> </div> </div> </div> <div id="footer-shadow"></div> <div id="footer"> <div id="alt-nav"> <?php include $_SERVER['DOCUMENT_ROOT'] . '/includes/altnav.inc.php'; //CHANGE WHEN UPLOADED TO MATCH DOCUMENT ROOT ?> </div> </div> </div>

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• When will the ValueConverter's Convert method be called in wpf

  - by sudarsanyes

  I have an ObservableCollection bound to a list box and a boolean property bound to a button. I then defined two converters, one that operates on the collection and the other operates on the boolean property. Whenever I modify the boolean property, the converter's Convert method is called, where as the same is not called if I modify the observable collection. What am I missing?? Snippets for your reference, xaml snipet, <Window.Resources> <local:WrapPanelWidthConverter x:Key="WrapPanelWidthConverter" /> <local:StateToColorConverter x:Key="StateToColorConverter" /> </Window.Resources> <StackPanel> <ListBox x:Name="NamesListBox" ItemsSource="{Binding Path=Names}"> <ListBox.ItemsPanel> <ItemsPanelTemplate> <WrapPanel x:Name="ItemWrapPanel" Width="500" Background="Gray"> <WrapPanel.RenderTransform> <TranslateTransform x:Name="WrapPanelTranslatation" X="0" /> </WrapPanel.RenderTransform> <WrapPanel.Triggers> <EventTrigger RoutedEvent="WrapPanel.Loaded"> <BeginStoryboard> <Storyboard> <DoubleAnimation Storyboard.TargetName="WrapPanelTranslatation" Storyboard.TargetProperty="X" To="{Binding Path=Names,Converter={StaticResource WrapPanelWidthConverter}}" From="525" Duration="0:0:2" RepeatBehavior="100" /> </Storyboard> </BeginStoryboard> </EventTrigger> </WrapPanel.Triggers> </WrapPanel> </ItemsPanelTemplate> </ListBox.ItemsPanel> <ListBox.ItemTemplate> <DataTemplate> <Grid> <Label Content="{Binding}" Width="50" Background="LightGray" /> </Grid> </DataTemplate> </ListBox.ItemTemplate> </ListBox> <Button Content="{Binding Path=State}" Background="{Binding Path=State, Converter={StaticResource StateToColorConverter}}" Width="100" Height="100" Click="Button_Click" /> </StackPanel> code behind snippet public class WrapPanelWidthConverter : IValueConverter { public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture) { ObservableCollection<string> aNames = value as ObservableCollection<string>; return -(aNames.Count * 50); } public object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture) { throw new NotImplementedException(); } } public class StateToColorConverter : IValueConverter { public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture) { bool aState = (bool)value; if (aState) return Brushes.Green; else return Brushes.Red; } public object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture) { throw new NotImplementedException(); } }

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• HTML Purifier: Removing an element conditionally based on its attributes

  - by pinkgothic

  As per the HTML Purifier smoketest, 'malformed' URIs are occasionally discarded to leave behind an attribute-less anchor tag, e.g. <a href="javascript:document.location='http://www.google.com/'">XSS</a> becomes <a>XSS</a> ...as well as occasionally being stripped down to the protocol, e.g. <a href="http://1113982867/">XSS</a> becomes <a href="http:/">XSS</a> While that's unproblematic, per se, it's a bit ugly. Instead of trying to strip these out with regular expressions, I was hoping to use HTML Purifier's own library capabilities / injectors / plug-ins / whathaveyou. Point of reference: Handling attributes Conditionally removing an attribute in HTMLPurifier is easy. Here the library offers the class HTMLPurifier_AttrTransform with the method confiscateAttr(). While I don't personally use the functionality of confiscateAttr(), I do use an HTMLPurifier_AttrTransform as per this thread to add target="_blank" to all anchors. // more configuration stuff up here $htmlDef = $htmlPurifierConfiguration->getHTMLDefinition(true); $anchor = $htmlDef->addBlankElement('a'); $anchor->attr_transform_post[] = new HTMLPurifier_AttrTransform_Target(); // purify down here HTMLPurifier_AttrTransform_Target is a very simple class, of course. class HTMLPurifier_AttrTransform_Target extends HTMLPurifier_AttrTransform { public function transform($attr, $config, $context) { // I could call $this->confiscateAttr() here to throw away an // undesired attribute $attr['target'] = '_blank'; return $attr; } } That part works like a charm, naturally. Handling elements Perhaps I'm not squinting hard enough at HTMLPurifier_TagTransform, or am looking in the wrong place(s), or generally amn't understanding it, but I can't seem to figure out a way to conditionally remove elements. Say, something to the effect of: // more configuration stuff up here $htmlDef = $htmlPurifierConfiguration->getHTMLDefinition(true); $anchor = $htmlDef->addElementHandler('a'); $anchor->elem_transform_post[] = new HTMLPurifier_ElementTransform_Cull(); // add target as per 'point of reference' here // purify down here With the Cull class extending something that has a confiscateElement() ability, or comparable, wherein I could check for a missing href attribute or a href attribute with the content http:/. HTMLPurifier_Filter I understand I could create a filter, but the examples (Youtube.php and ExtractStyleBlocks.php) suggest I'd be using regular expressions in that, which I'd really rather avoid, if it is at all possible. I'm hoping for an onboard or quasi-onboard solution that makes use of HTML Purifier's excellent parsing capabilities. Returning null in a child-class of HTMLPurifier_AttrTransform unfortunately doesn't cut it. Anyone have any smart ideas, or am I stuck with regexes? :)

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• jQuery tools modal overlay display problem in IE6-8

  - by Michael Stone

  I'm trying to enable the overlay to be modal. It works perfectly fine in FireFox, but the window object is behind the mask when it becomes modal. This prevents any interaction with it and the page is actually useless. I've tried debugging this for a while and can't figure it out. Here is a link to the example on their site: http://flowplayer.org/tools/demos/overlay/modal-dialog.html $.fn.cfwindow = function(btnEvent,modal,draggable){ //error checking if(btnEvent == ""){ alert('Error in window :\n Please provide an id that instantiates the window. '); } if(!modal && !draggable){ $('#'+btnEvent+'[rel]').overlay(); $('#content_overlay').css('cursor','default'); } if(!modal && draggable){ $('#'+btnEvent+'[rel]').overlay(); $('#content_overlay').css('cursor','move'); $('#custom').draggable(); } if(modal){ $('#'+btnEvent+'[rel]').overlay({ // some mask tweaks suitable for modal dialogs mask: { color: '#646464', loadSpeed: 200, opacity: 0.6 }, closeOnClick: false }); $('#content_overlay').css('cursor','default'); //$('#custom').addClass('modal'); } }; That's what I'm referencing when I call through: <script type="text/javascript"> $(document).ready(function(){ $(document).pngFix(); var modal = <cfoutput>#attributes.modal#; var drag = #attributes.draggable#; var btn = '#attributes.selector#'; var src = '#attributes.source#'; var wid = '#attributes.width#'; $('##custom').width(parseInt(wid)); $('div##load_content').load(src); $('##custom').cfwindow(btn,modal,drag,wid); }); </script> CSS for the modal: <style type="text/css"> .modal { display:none; text-align:left; background-color:#FFFFFF; -moz-border-radius:6px; -webkit-border-radius:6px; } </style> Exclude the and the additional pound signs, IE. "##". Screen shot of the problem: http://twitpic.com/1tak06 Note: IE6 and IE8 have the same problem. Any help would be appreciated.

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• AvalonDock + UserControl + DataGrid + ContextMenu command routing issue

  - by repka

  I have this kind of layout: <Window x:Class="DockAndMenuTest.MainWindow" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:ad="clr-namespace:AvalonDock;assembly=AvalonDock" Title="MainWindow" Height="350" Width="525"> <ad:DockingManager> <ad:DocumentPane> <ad:DockableContent Title="Doh!"> <UserControl> <UserControl.CommandBindings> <CommandBinding Command="Zoom" Executed="ExecuteZoom" CanExecute="CanZoom"/> </UserControl.CommandBindings> <DataGrid Name="_evilGrid"> <DataGrid.Resources> <Style TargetType="DataGridRow"> <Setter Property="ContextMenu"> <Setter.Value> <ContextMenu> <MenuItem Command="Zoom"/> </ContextMenu> </Setter.Value> </Setter> </Style> </DataGrid.Resources> </DataGrid> </UserControl> </ad:DockableContent> </ad:DocumentPane> </ad:DockingManager> </Window> Briefly: ContextMenu is set for each DataGridRow of DataGrid inside UserControl, which in its turn is inside DockableContent of AvalonDock. Code-behind is trivial as well: public partial class MainWindow { public MainWindow() { InitializeComponent(); _evilGrid.ItemsSource = new[] { Tuple.Create(1, 2, 3), Tuple.Create(4, 4, 3), Tuple.Create(6, 7, 1), }; } private void ExecuteZoom(object sender, ExecutedRoutedEventArgs e) { MessageBox.Show("zoom !"); } private void CanZoom(object sender, CanExecuteRoutedEventArgs e) { e.CanExecute = true; } } So here's the problem: right-clicking on the selected row (if it it was selected before the right click) my command comes out disabled. The command is "Zoom" in this case, but can be any other, including a custom one. If I get rid of either docking or UserControl around my grid there are no problems. ListBox doesn't have this issue either. So I don't know what's at fault here. SNOOP shows that in cases when this propagation fails, instead of UserControl, CanExecute is handled by PART_ShowContextMenuButton (Button), which is part of docking header. I've had other issues with UI command propagation within UserControls hosted inside AvalonDock, but this one is the easiest to reproduce.

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• Implementing EAV pattern with Hibernate for User -> Settings relationship

  - by Trevor

  I'm trying to setup a simple EAV pattern in my web app using Java/Spring MVC and Hibernate. I can't seem to figure out the magic behind the hibernate XML setup for this scenario. My database table "SETUP" has three columns: user_id (FK) setup_item setup_value The database composite key is made up of user_id | setup_item Here's the Setup.java class: public class Setup implements CommonFormElements, Serializable { private Map data = new HashMap(); private String saveAction; private Integer speciesNamingList; private User user; Logger log = LoggerFactory.getLogger(Setup.class); public String getSaveAction() { return saveAction; } public void setSaveAction(String action) { this.saveAction = action; } public User getUser() { return user; } public void setUser(User user) { this.user = user; } public Integer getSpeciesNamingList() { return speciesNamingList; } public void setSpeciesNamingList(Integer speciesNamingList) { this.speciesNamingList = speciesNamingList; } public Map getData() { return data; } public void setData(Map data) { this.data = data; } } My problem with the Hibernate setup, is that I can't seem to figure out how to map out the fact that a foreign key and the key of a map will construct the composite key of the table... this is due to a lack of experience using Hibernate. Here's my initial attempt at getting this to work: <composite-id> <key-many-to-one foreign-key="id" name="user" column="user_id" class="Business.User"> <meta attribute="use-in-equals">true</meta> </key-many-to-one> </composite-id> <map lazy="false" name="data" table="setup"> <key column="user_id" property-ref="user"/> <composite-map-key class="Command.Setup"> <key-property name="data" column="setup_item" type="string"/> </composite-map-key> <element column="setup_value" not-null="true" type="string"/> </map> Any insight into how to properly map this common scenario would be most appreciated!

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• WPF ComboBox SelectedValue not updating from binding source.

  - by vg1890

  Here's my binding source object: Public Class MyListObject Private _mylist As New ObservableCollection(Of String) Private _selectedName As String Public Sub New(ByVal nameList As List(Of String), ByVal defaultName As String) For Each name In nameList _mylist.Add(name) Next _selectedName = defaultName End Sub Public ReadOnly Property MyList() As ObservableCollection(Of String) Get Return _mylist End Get End Property Public ReadOnly Property SelectedName() As String Get Return _selectedName End Get End Property End Class Here is my XAML: <Window x:Class="Window1" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" Title="Window1" Height="300" Width="300" xmlns:local="clr-namespace:WpfApplication1" > <Window.Resources> <ObjectDataProvider x:Key="MyListObject" ObjectInstance="" /> </Window.Resources> <Grid> <ComboBox Height="23" Margin="24,91,53,0" Name="ComboBox1" VerticalAlignment="Top" SelectedValue="{Binding Path=SelectedName, Source={StaticResource MyListObject}, Mode=OneWay}" ItemsSource="{Binding Path=MyList, Source={StaticResource MyListObject}, Mode=OneWay}" /> <Button Height="23" HorizontalAlignment="Left" Margin="47,0,0,87" Name="btn_List1" VerticalAlignment="Bottom" Width="75">List 1</Button> <Button Height="23" Margin="0,0,75,87" Name="btn_List2" VerticalAlignment="Bottom" HorizontalAlignment="Right" Width="75">List 2</Button> </Grid> </Window> Here's the code-behind: Class Window1 Private obj1 As MyListObject Private obj2 As MyListObject Private odp As ObjectDataProvider Public Sub New() InitializeComponent() Dim namelist1 As New List(Of String) namelist1.Add("Joe") namelist1.Add("Steve") obj1 = New MyListObject(namelist1, "Steve") . Dim namelist2 As New List(Of String) namelist2.Add("Bob") namelist2.Add("Tim") obj2 = New MyListObject(namelist2, "Tim") odp = DirectCast(Me.FindResource("MyListObject"), ObjectDataProvider) odp.ObjectInstance = obj1 End Sub Private Sub btn_List1_Click(ByVal sender As System.Object, ByVal e As System.Windows.RoutedEventArgs) Handles btn_List1.Click odp.ObjectInstance = obj1 End Sub Private Sub btn_List2_Click(ByVal sender As System.Object, ByVal e As System.Windows.RoutedEventArgs) Handles btn_List2.Click odp.ObjectInstance = obj2 End Sub End Class When the Window first loads, the bindings hook up fine. The ComboBox contains the names "Joe" and "Steve" and "Steve" is selected by default. However, when I click a button to switch the ObjectInstance to obj2, the ComboBox ItemsSource gets populated correctly in the dropdown, but the SelectedValue is set to Nothing instead of being equal to obj2.SelectedName. Thanks in advance!

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• point light illumination using Phong model

  - by Myx

  Hello: I wish to render a scene that contains one box and a point light source using the Phong illumination scheme. The following are the relevant code snippets for my calculation: R3Rgb Phong(R3Scene *scene, R3Ray *ray, R3Intersection *intersection) { R3Rgb radiance; if(intersection->hit == 0) { radiance = scene->background; return radiance; } ... // obtain ambient term ... // this is zero for my test // obtain emissive term ... // this is also zero for my test // for each light in the scene, obtain calculate the diffuse and specular terms R3Rgb intensity_diffuse(0,0,0,1); R3Rgb intensity_specular(0,0,0,1); for(unsigned int i = 0; i < scene->lights.size(); i++) { R3Light *light = scene->Light(i); R3Rgb light_color = LightIntensity(scene->Light(i), intersection->position); R3Vector light_vector = -LightDirection(scene->Light(i), intersection->position); // check if the light is "behind" the surface normal if(normal.Dot(light_vector)<=0) continue; // calculate diffuse reflection if(!Kd.IsBlack()) intensity_diffuse += Kd*normal.Dot(light_vector)*light_color; if(Ks.IsBlack()) continue; // calculate specular reflection ... // this I believe to be irrelevant for the particular test I'm doing } radiance = intensity_diffuse; return radiance; } R3Rgb LightIntensity(R3Light *light, R3Point position) { R3Rgb light_intensity; double distance; double denominator; if(light->type != R3_DIRECTIONAL_LIGHT) { distance = (position-light->position).Length(); denominator = light->constant_attenuation + (light->linear_attenuation*distance) + (light->quadratic_attenuation*distance*distance); } switch(light->type) { ... case R3_POINT_LIGHT: light_intensity = light->color/denominator; break; ... } return light_intensity; } R3Vector LightDirection(R3Light *light, R3Point position) { R3Vector light_direction; switch(light->type) { ... case R3_POINT_LIGHT: light_direction = position - light->position; break; ... } light_direction.Normalize(); return light_direction; } I believe that the error must be somewhere in either LightDirection(...) or LightIntensity(...) functions because when I run my code using a directional light source, I obtain the desired rendered image (thus this leads me to believe that the Phong illumination equation is correct). Also, in Phong(...), when I computed the intensity_diffuse and while debugging, I divided light_color by 10, I was obtaining a resulting image that looked more like what I need. Am I calculating the light_color correctly? Thanks.

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• Best way to handle multiple tables to replace one big table in Rails? (e.g. 'Books1', 'Books2', etc.

  - by mikep

  Hello, I've decided to use multiple tables for an entity (e.g. Books1, Books2, Books3, etc.), instead of just one main table which could end up having a lot of rows (e.g. just Books). I'm doing this to try and to avoid a potential future performance drop that could come with having too many rows in one table. With that, I'm looking for a good way to handle this in Rails, mainly by trying to avoid loading a bunch of unused associations. (I know that I could use a partition for this, but, for now, I've decided to go the 'multiple tables' route.) Each user has their books placed into a specific table. The actual book table is chosen when the user is created, and all of their books go into the same table. I'm going to split the adds across the tables. The goal is to try and keep each table pretty much even -- but that's a different issue. One thing I don't particularly want to have is a bunch of unused associations in the User class. Right now, it looks like I'd have to do the following: class User < ActiveRecord::Base has_many :books1, :books2, :books3, :books4, :books5 end class Books1 < ActiveRecord::Base belongs_to :user end class Books2 < ActiveRecord::Base belongs_to :user end class Books3 < ActiveRecord::Base belongs_to :user end I'm assuming that the main performance hit would come in terms of memory and possibly some method call overhead for each User object, since it has to load all of those associations, which in turn creates all of those nice, dynamic model accessor methods like User.find_by_. But for each specific user, only one of the book tables would be usable/applicable, since all of a user's books are stored in the same table. So, only one of the associations would be in use at any time and any other has_many :bookX association that was loaded would be a waste. For example, with a user.id of 2, I'd only need books3.find_by_author('Author'), but the way I'm thinking of setting this up, I'd still have access to Books1..n. I don't really know Ruby/Rails does internally with all of those has_many associations though, so maybe it's not so bad. But right now I'm thinking that it's really wasteful, and that there may just be a better, more efficient way of doing this. So, a few questions: 1) Is there's some sort of special Ruby/Rails methodology that could be applied to this 'multiple tables to represent one entity' scheme? Are there any 'best practices' for this? 2) Is it really bad to have so many unused has_many associations for each object? Is there a better way to do this? 3) Does anyone have any advice on how to abstract the fact that there's multiple book tables behind a single books model/class? For example, so I can call books.find_by_author('Author') instead of books3.find_by_author('Author'). Thank you!

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• Hiding iPhone Status Bar pulls my tableViews up by 20px

  - by JustinXXVII

  When doing an asynchronous HTTP request, I hide the iPhone status bar and animate in my own custom UIViewController to show upload status. So instead of seeing signal strength, carrier, time and battery life, the user gets messages based on the progress of the HTTP request. My status bar is exactly 20px high, and fits nicely where the status bar used to be. When the HTTP activity is done, the custom view animates out and the iPhone status bar animates back in. I would like to just avoid hiding the iPhone status bar completely, and instead bring my custom view ON TOP of the status bar. Currently, if I invoke my custom view animation and keep the iPhone status bar set to visible, my custom view is behind it. This is the code I have: -(void) animateStatusBarIn { CGRect statusFrame = CGRectMake(0.0f, -20.0f, 320.0f, 20.0f); UploadStatusBar *statusView = [[UploadStatusBar alloc] initWithNibName:@"UploadStatusBar" bundle:nil]; self.status = statusView; [statusView release]; status.view.frame = statusFrame; [[UIApplication sharedApplication] setStatusBarHidden:YES animated:YES]; [window addSubview:status.view]; [UIView beginAnimations:@"slideDown" context:nil]; [UIView setAnimationDuration:0.3]; [UIView setAnimationDelegate:self]; [UIView setAnimationDidStopSelector:@selector(animationFinished:)]; status.view.frame = CGRectMake(0.0f, 0.0f, 320.0f, 20.0f); [UIView commitAnimations]; } -(void) animateStatusBarOut { [UIView beginAnimations:@"slideUp" context:nil]; [UIView setAnimationDuration:0.3]; [UIView setAnimationDelegate:self]; [UIView setAnimationDidStopSelector:@selector(animationFinished:)]; status.view.frame = CGRectMake(0.0f, -20.0f, 320.0f, 20.0f); [UIView commitAnimations]; } -(void)animationFinished:(NSString *)name { if ([name isEqualToString:@"slideDown"]) { } if ([name isEqualToString:@"slideUp"]) { [[UIApplication sharedApplication]setStatusBarHidden:NO animated:YES]; [status.view removeFromSuperview]; } } Without the [[UIApplication sharedApplication]setStatusBarHidden:YES animated:YES] you can't see my custom view. How can I get my custom view to just appear on top of the status bar so I don't have to hide it? Thank you!

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• What am I missing about WCF?

  - by Bigtoe

  I've been developing in MS technologies for longer than I care to remember at this stage. When .NET arrived on the scene I thought they hit the nail on the head and with each iteration and version I thought their technologies were getting stronger and stronger and looked forward to each release. However, having had to work with WCF for the last year I must say I found the technology very difficult to work with and understand. Initially it's quite appealing but when you start getting into the guts of it, configuration is a nightmare, having to override behaviours for message sizes, number of objects contained in a messages, the complexity of the security model, disposing of proxies when faulted and finally moving back to defining interfaces in code rather than in XML. It just does not work out of the box and I think it should. We found all of the above issues while either testing ourselves or else when our products were out on site. I do understand the rationale behind it all, but surely they could have come up with simpler implementation mechanism. I suppose what I'm asking is, Am I looking at WCF the wrong way? What strengths does it have over the alternatives? Under what circumstances should I choose to use WCF? OK Folks, Sorry about the delay in responding, work does have a nasty habbit of get in the way somethimes :) Some clarifications My main paint point with WCF I suppose falls down into the following areas While it does work out of the box, your left with some major surprises under the hood. As pointed out above basic things are restricted until they are overridden Size of string than can be passed can't be over 8K Number of objects that can be passed in a single message is restricted Proxies not automatically recovering from failures The amount of configuration while it's there is a good thing, but understanding it all and what to use what and under which circumstances can be difficult to understand. Especially when deploying software on site with different security requirements etc. When talking about configuration, we've had to hide lots of ours in a back-end database because security and network people on-site were trying to change things in configuration files without understanding it. Keeping the configuration of the interfaces in code rather than moving to explicitly defined interfaces in XML, which can be published and consumed by almost anything. I know we can export the XML from the assembley, but it's full of rubbish and certain code generators choke on it. I know the world moves on, I've moved on a number of times over the last (ahem 22 years I've been developing) and am actively using WCF, so don't get me wrong, I do understand what it's for and where it's heading. I just think there should be simplier configuration/deployment options available, easier set-up and better management for configuration (SQL config provider maybe, rahter than just the web.config/app.config files). OK, back to the daily grid. Thanks for all your replies so far. Kind Regards Noel

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• Determine the 'Overtype' mode using Javascript

  - by Snorkpete

  We are creating a web app to replace an old-school green-screen application. In the green-screen app, as the user presses the Insert key to switch between overtype and insert modes, the cursor changes to indicate which input mode the user is currently in. In IE (which is the official browser of the company), overtype mode also works, but there's no visual indication as to whether overtype mode is on or not, until the user starts typing and possibly over-writes existing information unexpectedly. I'd like to put some sort of visual indicator on the screen if in overtype mode. How can you determine if the browser is in 'overtype mode' from Javascript? Is there some property or function i can query to determine if the browser is in overtype mode? Even an IE-specific solution would be helpful, since our corporate policy dictates the browser to use as IE7 (pure torture, btw). (I do know that one solution is to do check for key presses of the Insert key. However, it's a solution that I'd prefer to avoid since that method seems a bit flaky & error-prone because I can't guarantee what mode the user would be in BEFORE he/she hits my page. ) The reasoning behind this question: The functionality of this portion of the green-screen app is such that the user can select from a list of 'preformatted bodies of text'. crude eg. The excess for this policy is: $xxxxxx and max limit is:$xxxxxx Date of policy is: xx/xx/xxxx and expires : xx/xx/xxxx Some other irrelevant text After selecting this 'preformatted text', the user would then use overtype to replace the x's with actual values, without disturbing the alignment of the rest of the text. (To be clear, they can still edit any part of the 'preformatted text' if they so wished. It's just that usually, they just wish to replace specific portions of the text. Keeping the alignment is important since these sections of text can end up on printed documents.) Of course, the same effect can be achieved by just selecting the x's to replace first, but it would be helpful (with respect to easing the transition to the web app) to allow old methods of doing things to continue to work, while still allowing 'web methods' to be used by the more tech-savvy users. Essentially, we're trying to make the initial transition from the green-screen app to the web app be as seemless as possible to minimise the resistance from the long-time green-screeners.

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• Web Safe Area (optimal resolution) for web app design

  - by M.A.X

  I'm in the process of designing a new web app and I'm wondering for what 'web safe area' should I optimize the app layout and design. I did some investigation and thinking on my own but wanted to share this to see what the general opinion is. Here is what I found: Optimal Display Resolution: w3schools web stats seems to be the most referenced source (however they state that these are results from their site and is biased towards tech savvy users) http://www.w3counter.com/globalstats.php (aggregate data from something like 15,000 different sites that use their tracking services) StatCounter Global Stats Display Resolution (Stats are based on aggregate data collected by StatCounter on a sample exceeding 15 billion pageviews per month collected from across the StatCounter network of more than 3 million websites) NetMarketShare Screen Resolutions (marketshare.hitslink.com) (a web analytics consulting firm, they get data from browsers of site visitors to their on-demand network of live stats customers. The data is compiled from approximately 160 million visitors per month) Display Resolution Summary: There is a bit of variation between the above sources but in general as of Jan 2011 looks like 1024x768 is about 20%, while ~85% have a higher resolution of at least 1280x768 (1280x800 is the most common of these with 15-20% of total web, depending on the source; 1280x1024 and 1366x768 follow behind with 9-14% of the share). My guess would be that the higher resolution values will be even more common if we filter on North America, and even higher if we filter on N.American corporate users (unfortunately I couldn't find any free geographically filtered statistics). Another point to note is that the 1024x768 desktop user population is likely lower than the aforementioned 20%, seeing as the iPad (1024x768 native display) is likely propping up those number. My recommendation would be to optimize around the 1280x768 constraint (*note: 1280x768 is actually a relatively rare resolution, but I think it's a valid constraint range considering that 1366x768 is relatively common and 1280 is the most common horizontal resolution). Browser + OS Constraints: To further add to the constraints we have to subtract the space taken up by the browser (assuming IE, which is the most space consuming) and the OS (assuming WinXP-Win7): Win7 has the biggest taskbar footprint at a height of 40px (XP's and Vista's is 30px) The default IE8 view uses up 25px at the bottom of the screen with the status bar and a further 120px at the top of the screen with the windows title bar and the browser UI (assuming the default 'favorites' toolbar is present, it would instead be 91px without the favorites toolbar). Assuming no scrollbar, we also loose a total of 4px horizontally for the window outline. This means that we are left with 583px of vertical space and 1276px of horizontal. In other words, a Web Safe Area of 1276 x 583 Is this a correct line of thinking? I tried to Google some design best practices but most still talk about designing around 1024x768 which seems to be quickly disappearing. Any help on this would be greatly appreciated! Thanks.

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• Maven nexus with jetty 7 and apache2 reverse proxy

  - by user613154

  Hello stackoverflow ! Here is my problem : i try to run a maven nexus behind an apache reverse proxy. As i have multiples war in my jetty, i want the nexus to run here : http://localhost:8080/nexus I made a jetty context file as follow : {jetty.home}/contexts/nexus.xml <?xml version="1.0" encoding="ISO-8859-1"?> <!DOCTYPE Configure PUBLIC "-//Jetty//Configure//EN" "http://www.eclipse.org/jetty/configure.dtd"> <Configure class="org.eclipse.jetty.webapp.WebAppContext"> <Set name="contextPath">/nexus</Set> <Set name="war"><SystemProperty name="jetty.home" default="."/>/webapps/nexus.war</Set> </Configure> My jetty connector in jetty.xml is as follow : <Call name="addConnector"> <Arg> <New class="org.eclipse.jetty.server.nio.SelectChannelConnector"> <Set name="host"><Property name="jetty.host" /></Set> <Set name="port"><Property name="jetty.port" default="8080"/></Set> <Set name="maxIdleTime">300000</Set> <Set name="Acceptors">2</Set> <Set name="forwarded">true</Set> <Set name="statsOn">false</Set> <Set name="confidentialPort">8443</Set> <Set name="lowResourcesConnections">20000</Set> <Set name="lowResourcesMaxIdleTime">5000</Set> </New> </Arg> </Call> I want http://maven.foo.com/ as an end point for the nexus, so i made this apache2 configuration file : ProxyRequests Off ProxyVia Off ProxyPreserveHost On <Proxy *> AddDefaultCharset off Order deny,allow Allow from all </Proxy> <VirtualHost *:80> ServerName maven.foo.com ProxyPass / http://localhost:8080/nexus/ ProxyPassReverse / http://localhost:8080/nexus/ ErrorLog ${APACHE_LOG_DIR}/error_nexus.log </VirtualHost> But i can't manage to make it work. The error message displayed in the browser is "The server has not found anything matching the request URI". I tried to read docs on jetty and apache web site, but didn't find information for mapping a subdomain "sub.foo.com" to a context "localhost:8080/sub" ... Any help welcome ! Thanks

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