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• Hex colors: Numeric representation for "transparent"?

  - by Pekka

  I am building a web CMS in which the user can choose colours for certain site elements. I would like to convert all colour values to hex to avoid any further formatting hassle ("rgb(x,y,z)" or named colours). I have found a good JS library for that. The only thing that I can't get into hex is "transparent". I need this when explicitly declaring an element as transparent, which in my experience can be different from not defining any value at all. Does anybody know whether this can be turned into some numeric form? Will I have to set up all processing instances to accept hex values or "transparent"? I can't think of any other way.

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• How can I ensure that when I shuffle my puzzle I still end up with an even permutation?

  - by Mithrax

  I'm interested making an implementation of the 14-15 puzzle: I'm creating an array with the values 0 - 15 in increasing order: S = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15 } Now, what I want to do is shuffle them to create a new instance of the puzzle. However, I know that if I create a board with an "odd permutation" than it is unsolvable. Wikipedia says I need to create the puzzle with an even permutation. I believe this means that I simply have to do ensure I do an even number of swaps? How would I modify Fisher-Yates so I ensure I end up with an even permutation at the end? If I do a swap for every element in the array that would be 16 swaps which I believe would be an even permutation. However, do I need to be concerned about swapping with itself? Is there any other way to ensure I have a valid puzzle?

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• Equality between two enumerables

  - by Berryl

  I have two enumerables with the exact same reference elements, and wondering why Equals wouldn't be true. As a side question, the code below to compare each element works, but there must be a more elegant way Cheers, Berryl var other = (ActivityService) obj; if (!AllAccounts.Count().Equals(other.AllAccounts.Count())) return false; for (int i = 0; i < AllAccounts.Count(); i++) { if (!AllAccounts.ElementAt(i).Equals(other.AllAccounts.ElementAt(i))) { return false; } } return true;

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• Qt: Background color on QStandardItem using StyleSheet

  - by Johan

  Hi I have a class that inherits QStandardItem and I put the elements in a QTreeWidget. The class receive notifications from the outside and I want to change the background color of the item based on what happened. If I do not use stylesheets it works just fine, like this: void myClass::onExternalEvent() { setBackground(0, QColor(255,0,0))); } However as soon as I put a stylesheet on the QTreeWidget this has no effect, the stylesheet seems to override the setBackground call. So I tried : void myClass::onExternalEvent() { this-setStyleSheet("background-color: red"); } but this is probably all wrong, it changed the color of some other element on my screen, not sure why. So anyone have an idea on how I can alter the background color like with setBackgroundColor but still be able to use stylesheet on my QTreeWidget?

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• How to setup a project to use TweetSharp

  - by Stuart Helwig

  I am trying to follow Pete Brown's introductory WPF tutorial which makes use of the TweetSharp libraries to interact with Twitter. I have downloaded what appears to be the latest TweetSharp binaries (and a few others including the ReleaseCandidate) from Codeplex (http://tweetsharp.codeplex.com/). No matter what references I add and no matter what using statements I try, I cannot create a reference to the TwitterService for the FluentTwitter class. I simply get the compiler error - "The type or namespace cannot be found". Now I've noticed that the TweetSharp.dll that Pete references is 518KB but the one contained in each of my different downloads is only 84kb. (I've tried several times - I am getting the full download here). The link from Pete's article to the TweetSharp libraries, no longer works (http://code.google.com/p/tweetsharp/). What basic element am I missing here or what could I be doing wrong?

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• VisualStudio 2010 Settings Page - Collection Settings

  - by Ed Eichman

  I have a list of Filemaker database names Each DB name has a list of field/attribute pairs associated with it I have a windows form application in C# 4.0 (vs2010) that wants to use the above data I would like to maintain the list either in the Visual Studio settings page, or in one of the standard visual studio settings files using the standard .NET settings calls I would like to avoid writing my own custom settings, xml, xds (to avoid the "Could not find schema information for the element/attribute " errors) I just have a slightly complicated INI file! I don't want to complicate my life! Do any easy solutions exist? Unless someone has a brighter idea, I am simply going to write string settings with names that indicate it's a FM DB (e.g. "fmdbAddresses"), and values that concat my field/attribute pairs (e.g. "gUserResult=skipField|gAddressID=convertToInt|gAddressID=uniqueIx")

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• How to access the Principal from a Java service object without using FlexContext?

  - by Marplesoft

  We're building some Java objects that are exposed via BlazeDS to our flex client application. So basically the BlazeDS messagebroker servlet instantiates and invokes methods on these objects in response to client requests. Works great. We're using app server-based authentication and have set up a security constraint on the <destination> elements in the remoting-config.xml file element to prevent unauthenticated clients from being able to access these remote java objects. Again, works fine. However, there are several places within the implementation of these java objects where we want to get the currently logged on user's username. Right now we are doing this via FlexContext.getUserPrincipal(), which gives access to this but we have a nagging concern that we don't like the idea that the implementation of these objects (the service layer) has a hard dependency on a BlazeDS class. But we're not sure how else to get access to this. The same applies to accessing the ServletContext and such. Any ideas?

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• Using wix3 SqlScript to run generated temporary sql-script files.

  - by leiflundgren

  I am starting to write an installer which will use the SqlScript-element. That takes a reference to the Binary-table what script to run. I would like to dynamically generate the script during the installation. I can see three possibilities: Somehow to get SqlScript to read it data from a file rather then a Binary entry. Inject my generated script into the Binary table Using SqlString Which will cause the need to place some rather long strings into Properties, but I guess that shouldn't really be a prolem. Any advice? Regards Leif (My reason, should anyone be interested is that the database should have a job set up, that calls on an installed exe-file. I prefer to create the job using sqlscript. And the path of that file is not known until InstallDir has been choosen.)

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• How do you handle the fetchxml result data?

  - by Luke Baulch

  I have avoided working with fetchxml as I have been unsure the best way to handle the result data after calling crmService.Fetch(fetchXml). In a couple of situations, I have used an XDocument with LINQ to retrieve the data from this data structure, such as: XDocument resultset = XDocument.Parse(_service.Fetch(fetchXml)); if (resultset.Root == null || !resultset.Root.Elements("result").Any()) { return; } foreach (var displayItem in resultset.Root.Elements("result").Select(item => item.Element(displayAttributeName)).Distinct()) { if (displayItem!= null && displayItem.Value != null) { dropDownList.Items.Add(displayItem.Value); } } What is the best way to handle fetchxml result data, so that it can be easily used. Applications such as passing these records into an ASP.NET datagrid would be quite useful.

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• CSS How to apply child:hover but not parent:hover

  - by CNelson

  With the following html, when I hover over child, I get a green background on parent. How can I stop that from happening? I do want the green background if I am hovering outside of the child element. CSS3 is fine. <style> .parent { padding: 100px; width: 400px; height:400px; } .parent:hover { background-color: green; } .child { padding: 100px; width: 200px; height:200px; } .child:hover { background-color: blue; } </style> <div class="parent"> <div class="child">Child</div> </div>

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• How to select text, but not images, in CSS

  - by thinkswan

  Simple question: I have the following markup... <a href='#'> <img src='icon.png'> This is the link </a> I want to have the text become underlined on mouseover. What is the CSS selector for selecting only the text in that <a> element and nothing else? I'd rather not wrap it in anything if I don't have to. a:hover { text-decoration: none; } a:hover <select_text_here> { text-decoration: underline; }

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• iPad/iPhone HTML5 video loading

  - by mrollinsiv

  I'm trying to load on the fly on the iPad/iPhone and notice that I cannot place a div above this. I put the overlay in the html so that it's generated on page load and not added via javascript and the video when its created is absolutely positioned below this element. This works on a PC, I'm wondering if since it was created via js that the iPhone OS is overriding the z-index and forcing to the top? Also is there a way to override the default "cannot play icon", the one with the slash, and show a loading animation instead? This would solve my issue via another route. My last option would be to loaded all the video tags via js on page load and have them layered on top of each other for the iPad/iPhone? Since the iPhone OS won't load any video until requested would this work? I also am having an issue with the iPhone and showing the "poster" attribute that is set on the video tag.

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• IE6 Hacks: Getting jQuery tools expose to work properly on my site

  - by Wild Thing

  Hi, I am trying to get the jQuery tools 'expose' function to work properly in IE6. The page is http://204.51.246.10:12123/ You will need IE6 to reproduce the bug (obviously :)). If you click 'Sign In' on the top-right corner (below the 'Join Today!' button), you will notice that the sign in panel (fieldset#login-controls) is getting covered by the background of its parent element (.signinPanel), which is very weird. It is not on the top of z-index, and I can't figure out why. Please note that in order to get fieldset#login-controls positioned correctly, I have applied the following hack for IE6: $("#header, #header div, #header table, #header td, #header tr").css("position", "static"); $("fieldset#login-controls *").css("position", "static"); This might be the reason for the above. I am pretty lost at this point, as I can't figure what's going on - any advise would be appreciated. Cheers, Wild Thing

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• A question about "empty" lists in Python

  - by bitrex

  I've started teaching myself Python, and as an exercise I've set myself the task of generating lookup tables I need for another project. I need to generate a list of 256 elements in which each element is the value of math.sin(2pi/256). The problem is I don't know how to generate a list initialized to "dummy" values that I can then use a for loop to step through and assign the values of the sin function. Using list[] seems to create an "empty" list, but with no elements so I get a "list assignment index out of range" error in the loop. Is there a way to this other than explicitly creating a list declaration containing 256 elements all with "0" as a value? Thanks!

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• Using XSD to validate node count

  - by heath

  I don't think this is possible but I thought I'd throw it out there. Given this XML: <people count="3"> <person>Bill</person> <person>Joe</person> <person>Susan</person> </people> Is it possible in an XSD to force the @count attribute value to be the correct count of defined elements (in this case, the person element)? The above example would obviously be correct and the below example would not validate: <people count="5"> <person>Bill</person> <person>Joe</person> <person>Susan</person> </people>

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• CSS / HTML centering a textbox

  - by Robert

  This should be easy but its proving difficult... My element I want centred is exactly this <input type="text"> I don't want the text centred, just the text box within the outer div. This is my attempt which is not working <div class ="temp123"> <input type="text" /> </div> Where: .temp123 { margin: 0 auto; margin-left: auto; margin-right: auto; } The text box remains on the left. The outer div has a fixed with of 300px and itself is centered using margin: 0 auto;

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• SWT Layout for absolute positioning with minimal-spanning composites

  - by pure.equal

  Hi, I'm writing a DND-editor where I can position elemtents (like buttons, images ...) freely via absolute positioning. Every element has a parent composite. These composites should span/grasp/embrace every element they contain. There can be two or more elements in the same composite and a composite can contain another composite. This image shows how it should look like. To achive this I wrote a custom layoutmanager: import org.eclipse.swt.SWT; import org.eclipse.swt.graphics.Point; import org.eclipse.swt.widgets.Composite; import org.eclipse.swt.widgets.Control; import org.eclipse.swt.widgets.Layout; public class SpanLayout extends Layout { Point[] sizes; int calcedHeight, calcedWidth, calcedX, calcedY; Point[] positions; /* * (non-Javadoc) * * @see * org.eclipse.swt.widgets.Layout#computeSize(org.eclipse.swt.widgets.Composite * , int, int, boolean) * * A composite calls computeSize() on its associated layout to determine the * minimum size it should occupy, while still holding all its child controls * at their minimum sizes. */ @Override protected Point computeSize(Composite composite, int wHint, int hHint, boolean flushCache) { int width = wHint, height = hHint; if (wHint == SWT.DEFAULT) width = composite.getBounds().width; if (hHint == SWT.DEFAULT) height = composite.getBounds().height; return new Point(width, height); } /* * (non-Javadoc) * * @see * org.eclipse.swt.widgets.Layout#layout(org.eclipse.swt.widgets.Composite, * boolean) * * Calculates the positions and sizes for the children of the passed * Composite, then places them accordingly by calling setBounds() on each * one. */ @Override protected void layout(Composite composite, boolean flushCache) { Control children[] = composite.getChildren(); for (int i = 0; i < children.length; i++) { calcedX = calcX(children[i]); calcedY = calcY(children[i]); calcedHeight = calcHeight(children[i]) - calcedY; calcedWidth = calcWidth(children[i]) - calcedX; if (composite instanceof Composite) { calcedX = calcedX - composite.getLocation().x; calcedY = calcedY - composite.getLocation().y; } children[i].setBounds(calcedX, calcedY, calcedWidth, calcedHeight); } } private int calcHeight(Control control) { int maximum = 0; if (control instanceof Composite) { if (((Composite) control).getChildren().length > 0) { for (Control child : ((Composite) control).getChildren()) { int calculatedHeight = calcHeight(child); if (calculatedHeight > maximum) { maximum = calculatedHeight; } } return maximum; } } return control.computeSize(SWT.DEFAULT, SWT.DEFAULT, true).y + control.getLocation().y; } private int calcWidth(Control control) { int maximum = 0; if (control instanceof Composite) { if (((Composite) control).getChildren().length > 0) { for (Control child : ((Composite) control).getChildren()) { int calculatedWidth = calcWidth(child); if (calculatedWidth > maximum) { maximum = calculatedWidth; } } return maximum; } } return control.computeSize(SWT.DEFAULT, SWT.DEFAULT, true).x + control.getLocation().x; } private int calcX(Control control) { int minimum = Integer.MAX_VALUE; if (control instanceof Composite) { if (((Composite) control).getChildren().length > 0) { for (Control child : ((Composite) control).getChildren()) { int calculatedX = calcX(child); if (calculatedX < minimum) { minimum = calculatedX; } } return minimum; } } return control.getLocation().x; } private int calcY(Control control) { int minimum = Integer.MAX_VALUE; if (control instanceof Composite) { if (((Composite) control).getChildren().length > 0) { for (Control child : ((Composite) control).getChildren()) { int calculatedY = calcY(child); if (calculatedY < minimum) { minimum = calculatedY; } } return minimum; } } return control.getLocation().y; } } The problem with it is that it always positions the composite at the position (0,0). This is because it tries to change the absolute positioning into a relative one. Lets say I position a image at position (100,100) and one at (200,200). Then it has to calculate the location of the composite to be at (100,100) and spanning the one at (200,200). But as all child positions are relative to their parents I have to change the positions of the children to remove the 100px offset of the parent. When the layout gets updated it moves everything to the top-left corner (as seen in the image) because the position of the image is not (100,100) but (0,0) since I tried to remove the 100px offset of the partent. Where is my error in reasoning? Is this maybe a totally wrong approach? Is there maybe an other way to achive the desired behavior? Thanks in advance! Best regards, Ed

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• CSS child selector (>) doesn't work with IE

  - by Eric

  The following CSS works well under firefox but doesn't work under IE browser, Why? Also, how can I make only the elements, directly under the parent element, be affected by CSS? CSS: .box{font:24px;} .box>div{font:18px} .box>div>div{font:12px;} HTML: <div class="box"> level1 <div> level2 <div> level3</div> <div> level3</div> </div> <div> level2 <div> level3</div> <div> level3</div> </div> </div>

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• R strsplit and vectorization

  - by James

  When creating functions that use strsplit, vector inputs do not behave as desired, and sapply needs to be used. This is due to the list output that strsplit produces. Is there a way to vectorize the process - that is, the function produces the correct element in the list for each of the elements of the input? For example, to count the lengths of words in a character vector: words <- c("a","quick","brown","fox") > length(strsplit(words,"")) [1] 4 # The number of words (length of the list) > length(strsplit(words,"")[[1]]) [1] 1 # The length of the first word only > sapply(words,function (x) length(strsplit(x,"")[[1]])) a quick brown fox 1 5 5 3 # Success, but potentially very slow Ideally, something like length(strsplit(words,"")[[.]]) where . is interpreted as the being the relevant part of the input vector.

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• copy HTML to UIPasteboard

  - by ManniAT

  Hi, I want to transfer HTML from my app to the iPhone mail application. I already have the HTML text - lest say <span style='color:red'Test</span I can place this to UIPasteBoard - but when I paste it to mail I get the html source. When I place the same string in a HTMLView - select it there and copy it it pastes as red text in mail. What do I have to do to place the string in the UIPasteBoard so that it pastes as red text to the mail application? I've been searching for "format types" - and found that UIPasteBoard returns "Aplle Web Archive pasteboard type" when I have the element (copied from UIWebView) in the clipboard. But setting this as type when adding the content to UIPasteBoard pastes nothing in the mail app. Manfred

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• D3.js binding an object to data and appending for each key

  - by frshca

  I'm a D3.js newbie and I'm learning how to play around with data. Let's say I have an object with names as keys, and each key has an array of numbers like this: var userdata = { 'John' : [0, 1, 3, 9, 8, 7], 'Harry': [0, 10, 7, 1, 1, 11], 'Steve': [3, 1, 4, 4, 4, 17], 'Adam' : [4, 77, 2, 13, 11, 13] }; For each user, I would like to append an SVG object and then plot the line with the array of values for that user. So here is my assumption of how that would look based on tutorials, but I know it is incorrect. This is to show my limited knowledge and give better understanding of what I'm doing: First I should create the line var line = d3.svg.line().interpolate('basis'); Then I want to bind the data to my body and append an svg element for each key: d3.select('body') .selectAll('svg') .data(userdata) .enter() .append('svg') .append(line) .x(function(d, i) { return i; }) .y(function(d) { return d[i]; }); So am I close??

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• How to use HTML-5 data-* attributes in ASP.NET MVC

  - by sleepy

  I am trying to use HTML5 data- attributes in my ASP.NET MVC 1 project. (I am a C# and ASP.NET MVC newbie.) <%= Html.ActionLink("« Previous", "Search", new { keyword = Model.Keyword, page = Model.currPage - 1}, new { @class = "prev", data-details = "Some Details" })%> The "data-details" in the above htmlAttributes give the following error: CS0746: Invalid anonymous type member declarator. Anonymous type members must be declared with a member assignment, simple name or member access. It works when I use data_details, but I guess it need to be starting with "data-" as per the spec. My questions: Is there any way to get this working and use HTML5 data attributes with Html.ActionLink or similar Html helpers ? Is there any other alternative mechanism to attach custom data to an element? This data is to be processed later by JS.

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• UiElement from abstract class

  - by plotnick

  I placed a control into a grid. let's say the control is derived from public class 'ButBase' which is derived in its turn from System.Windows.Controls.Button. The code normally compiles and app works just fine. But there's something really annoying. When you try to switch to xaml-design tab it will say 'The document root element is not supported by the visual designer', which is normal and I'm totally okay with that, but the thing is, that all the xaml code is underlined and VS2010 says: 'Cannot create an instance of ButBase' although still normally compiles and able to run. I've tried the same code in VS2008, it said that needs to see a public parameterless constructor in the ButBase, and even after I put one it showed the same error. What do I miss here?

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• PHP's SimpleXML not handling &#8217 ; properly

  - by Matty

  I'm parsing an RSS feed that has an &#8217; in it. SimpleXML turns this into a ’. What can I do to stop this? Just to answer some of the questions that have come up - I'm pulling an RSS feed using CURL. If I output this directly to the browser, the &#8217; displays as ’ which is what's expected. When I create a new SimpleXMLElement using this, (e.g. $xml = new SimpleXmlElement($raw_feed); and dump the $xml variable, every instance of &#8217; is replaced with ’. It appears that SimpleXML is having trouble with UTF-8 ampersand encoded characters. (The XML declaration specifies UTF-8.) I do have control over the feed after CURL has retrieved the feed before it's used to construct a SimpleXML element.

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• Flash under dhtml menu

  - by David

  I'm struggling with this probelm for few hours and it's drives me crazy. I want my drop down menu put over flash area and it works but only in FF. Unfotunelly IE and Opera shows my menu under flash. The DHTML menu system is the simplest as possible and it was wrote from scratch by me. I've been trying everything, and still it doesn't work like it should. I tried to put the flash element by jquery.flashEmbed script and by standard code with param transparent, but it never works. Plese help me, I'm loosing my head. Here is the xhtml: http://www.project.yamandi.com/toton/ Regards, David

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