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• Recording user data for heatmap with javascript

  - by Hanpan

  Hi, I was wondering how sites such as crazyegg.com store user click data during a session. Obviously there is some underlying script which is storing each clicks data, but how is that data then populated into a database? It seems to me the simple solution would be to send data via AJAX but when you consider that it's almost impossible to get a cross browser page unload function setup, I'm wondering if there is perhaps some other more advanced way of getting metric data. I even saw a site which records each mouse movement and I am guessing they are definitely not sending that data to a database on each mouse move event. So, in a nutshell, what kind of technology would I need in order to monitor user activity on my site and then store this information in order to create metric data? I am not looking to recreate GA, I'm just very interested to know how this sort of thing is done. Thanks in advance

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• What should I learn after HTML and CSS?

  - by Ryan B

  I am 5 days into learning how to make my website, flying through my HTML & CSS book and having fun. I’m starting to consider what to order next. I’m not sure what to study next, so please give me some advice if you can. My end goal is to create a site that has a lot of the functionality that www.edufire.com and similar sites have, just for example. I think I’m learning well with the Head First Series, and the style will probably serve me well as an intro to programming. However, I don't think the books dive too deeply into any 1 subject. I could order: A: Head First Programming: A Learner’s Guide to Programming Using the Python Language B: Head First Javascript C: Head First PHP & MySQL D: a different programming book or E: another CSS or design book to solidify my basic HTML & CSS skills Any guidance would be appreciated. Thanks!

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• nmake.exe: is there a way to exclude a file from a set of files specified in a macro?

  - by Cheeso

  I'm looking for something like the Exclude filter for msbuild, but I Want it in a makefile processed by nmake. Is that possible? Suppose I have a makefile that defines this macro: SOURCES=xxx.c yyy.c zzz.c and I invoke it with nmake OLD=xxx.c NEW=bbb.c ...can I produce, within the makefile, a macro with a value like: yyy.c zzz.c bbb.c ...basically substituting bbb.c for xxx.c ? The files can appear in any order. This would be pretty easy if the string substitution that is possible in nmake macros, allowed for evaluation of macros. In other words, I can do sources=xxx.c yyy.c zzz.c objs=$(sources:.c=.o) and the value of $(objs) is xxx.o yyy.o zzz.o But nmake does not allow a macro for the value of either argument to that substitution. I cannot do this: new=.o sources=xxx.c yyy.c zzz.c objs=$(sources:.c=$(new))

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• SQL to retrieve the latest records, grouping by unique foreign keys

  - by jbox

  I'm creating query to retrieve the latest posts in a forum using a SQL DB. I've got a table called "Post". Each post has a foreign key relation to a "Thread" and a "User" as well as a creation date. The trick is I don't want to show two posts by the same user or two posts in the same thread. Is it possible to create a query that contains all this logic? # Grab the last 10 posts. SELECT id, user_id, thread_id FROM posts ORDER BY created_at DESC LIMIT 10; # Grab the last 10 posts, max one post per user SELECT id, user_id, thread_id FROM post GROUP BY user_id ORDER BY date DESC LIMIT 10; # Grab the last 10 posts, max one post per user, max one post per thread???

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• How do I parse boolean logic?

  - by d03boy

  I need to write a boolean logic parser which will translate the boolean logic language to a SQL WHERE clause. The order of the operands will always be in the correct order (with value on the right). Here is a relatively simple example. There could be nested parentheses and the use of NOT operators, etc. (CACOUNT=01 OR CACOUNT=02 OR CACOUNT=03 OR CACOUNT=05 OR CACOUNT=07 OR CACOUNT=09 OR CACOUNT=12 OR CACOUNT=13 OR CACOUNT=18) AND Q4=1 AND NAME=TIMOTHY Here is what the WHERE clause would resemble. WHERE ( EXISTS ( SELECT 1 FROM MyVerticalTable b WHERE b.Key=a.Key AND b.Key='CACOUNT' AND b.Value='01' ) )

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• Is this a violation of the single responsiblity principle?

  - by L. Moser

  I have the following method and interface: public object ProcessRules(List<IRule> rules) { foreach(IRule rule in rules) { if(EvaluateExpression(rule.Exp) == true) return rule.Result; } //Some error handling here for not hitting any rules } public interface IRule { Expression Exp; Object Result; int Precedence; } Because rules have a precedence, they should actually never be processed out of order. This leads me with (I think) three solutions: Sort rules before passing them into the evaluator. Change the parameter type to something that enforces a sort order. Sort within the evaluator. I like option 3 because it always ensures that it is sorted and I like option 1 because it seems more cohesive. And option 2 seems like a good compromise. Is a scenario like this context specific/subjective, or is there really a best practice to be applied here?

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• Am I using EJBs properly?

  - by kgrad

  I am using a JEE6 stack including JPA 2.0, JSF 2.0, EJB 3.1 etc. The way my architecture is setup is the following: I have JPA annotated DAOs using hibernate as my JPA provider. I have JSF Managed beans which correspond to my facelet/xhtml pages. I have EJBs that handle all of my database requests. My XHTML pages have JSF EL which make calls to my Managed beans. My managed beans contain references to my DAO entities which are managed by EJBs. For example, I have a user entity which is mapped to a db table. I have a user EJB which handles all CRUD operations that return Users. I have a page that edits a user. The highlevel workflow would be: navigate to user edit page - EL calls a method located in the managed bean that loads a user. The method calls userEJB.loadUser(user) from the EJB to get the user from the database. The user is edited and submit - a function is called in the managed bean which calls a function in the EJB to save the user. etc. I am running into issues accessing my data within my JSF pages using EJBs. I am having a lot of problems with lazy initialization errors, which I believe is due to how I have set things up. For example, I have a Client entity that has a List of users which are lazily loaded. In order to get a client I call a method in my EJB which goes to the database, finds a client and returns it. Later on i wish to access this clients list of users, in order to do so i have to go back to the EJB by calling some sort of method in order to load those users (since they are lazily loaded). This means that I have to create a method such as public List<User> getUserListByClient(Client c) { c = em.merge(c); return c.getUserList(); } The only purpose of this method is to load the users (and I'm not even positive this approach is good or works). If i was doing session management myself, I would like just leave the session open for the entire request and access the property directly, this would be fine as the session would be open anyway, there seems to be this one extra layer of indirection in EJBs which is making things difficult for me. I do like EJBs as I like the fact that they are controlled by the container, pooled, offer transaction management for free etc. However, I get the feeling that I am using them incorrectly, or I have set up my JSF app incorrectly. Any feedback would be greatly appreciated. thanks,

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• How do I select last 5 rows in a table without sorting?

  - by ganesh Verma

  I want to select the last 5 records from a table in SQL Server without arranging the table in ascending or descending order.

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• Delphi - How to register a custom form...

  - by durumdara

  Hi! D6 Prof. Because of Z-Order problem I created a new form. I want to register this custom form in Delphi, to I can use it as normal form, and to I can replace my forms with this - to avoid Z-Order problems. But I don't know, how to do it. I created the class, but how to register? How to force Delphi to show it under "New..." menu? Thanks for your help: dd

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• Datamodel for a MVC learning project

  - by Dofs

  Hi, I am trying to learn Microsoft MVC 2, and have in that case found a small project I wanted to deploy it on. My idea was to simulate a restaurant where you can order a table. Basics: A user can only reserve a full table, so I don't have the trouble of merging people on different tables. A person can order a table for a certain amount of hours. My question was how I could make the data model the smartest way. I thought of just having a my database like this: Table { Id, TableName } Reservations { Id TableId ReservedFrom ReservedTo UserId } User { UserId UserName ... } By doing it this way I would have to program a lot of the logic in e.g. the business layer, to support which tables are occupied at what time, instead of having the data model handle it. Therefore do you guys have a better way to do this?

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• NHibernate: Mapping collections of value types

  - by Anry

  I have a table Order, Transaction, Payment. Class Order has the properties: public virtual Guid Id { get; set; } public virtual DateTime Created { get; set; } ... I added properties: public virtual IList<Transaction> Transactions { get; set; } public virtual IList<Payment> Payments { get; set; } These properties contain a record of tables [Transaction] and [Payment]. How to keep these lists in the database?

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• How do I get a screenshot of a given website using C#

  - by Ender

  I'm writing a specialised crawler and parser for internal use and I require the ability to take a screenshot of a web page in order to check what colours are being used throughout. The program will take in around ten web addresses and will save them as a bitmap image, from there I plan to use LockBits in order to create a list of the five most used colours within the image. To my knowledge it's the easiest way to get the colours used within a web page but if there is an easier way to do it please chime in with your suggestions. Anyway, I was going to use this program until I saw the price tag. I'm also fairly new to C#, having only used it for a few months. Can anyone provide me with a solution to my problem of taking a screenshot of a web page in order to extract the colour scheme? EDIT: Sorry for not getting back to this sooner, but I've been busy with some other things. Anyway, the code seems to work well, but the problem I am having right now is that I am running it within a form, and naturally with Application.Run() being called I cannot run two instances of the same form at once. It recommended Form.showDialog() but that broke everything. Can anyone give me a hand with this code? public static void buildScreenshotFromURL(string url) { int width = 800; int height = 600; using (WebBrowser browser = new WebBrowser()) { browser.Width = width; browser.Height = height; browser.ScrollBarsEnabled = true; // This will be called when the page finishes loading browser.DocumentCompleted += new System.Windows.Forms.WebBrowserDocumentCompletedEventHandler(OnDocumentCompleted); //browser.DocumentCompleted += OnDocumentCompleted; browser.Navigate(url); // This prevents the application from exiting until // Application.Exit is called // Application.Run() does not work as it cannot be called twice, recommended form.showDialog() // but still issues Application.Run(); } } public static void OnDocumentCompleted(object sender, WebBrowserDocumentCompletedEventArgs e) { // Define size of thumbnail neded int thumbSize = 50; // Now that the page is loaded, save it to a bitmap WebBrowser browser = (WebBrowser)sender; using (Graphics graphics = browser.CreateGraphics()) { using (Bitmap bitmap = new Bitmap(browser.Width, browser.Height, graphics)) { Rectangle bounds = new Rectangle(0, 0, bitmap.Width, bitmap.Height); browser.DrawToBitmap(bitmap, bounds); Bitmap thumbBitmap = new Bitmap(bitmap.GetThumbnailImage(thumbSize, thumbSize, thumbCall, IntPtr.Zero)); thumbBitmap.Save("screenshot.png", ImageFormat.Png); handleImage(thumbBitmap); } }

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• Fast partial sorting algorithm

  - by trican

  I'm looking for a fast way to do a partial sort of 81 numbers - Ideally I'm looking to extract the lowest 16 values (its not necessary for the 16 to be in the absolutely correct order). The target for this is dedicated hardware in an FPGA - so this slightly complicated matters as I want the area of the resultant implementation as small as possible. I looked at and implemented the odd-even merge sort algorithm, but I'm ideally looking for anything that might be more efficient for my needs (trade algorithm implementation size for a partial sort giving lowest 16, not necessarily in order as opposed to a full sort) Any suggestions would be very welcome Many thanks

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• How can I loop through posts as well as child pages to display them all by date in Wordpress 2.9

  - by Craig Dennis

  Some background info -- In wordpress I have my portfolio as a parent page with each item of work a child page. I also have a blog. I want to display the most recent 6 items on the homepage whether they are from my portfolio or my blog. I have a loop that displays the posts and on another page I have a loop that displays the child pages of a specific parent page. I only need to display the_title and the_post_thumbnail. Is it possible to loop through both the posts and the child pages and display them in order of date (recent first). So the final display would be a mixture of posts and child pages. Could it be done by having a separate loop for pages and one for posts, then somehow adding the results to an array and then pull them out in date order (recent first). Any help would be greatful. Thanks

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• Access 2007 VBA : Building a listbox with selection choices from another list box

  - by Justin

  So there are 8 categories that may be associated to each order, but not necessarily all of them. So i was going to build a list box that allowed the user to double click each of the category they wish to associate when they have an "Order Detail" form opened up (unbound form that has hidden text boxes with all needed ID numbers). I want to have another empty text box right beside it that will allow me to append the selections (up to 8) so the user can see that they have been added. So one list box with the default choices, and when a choice is double clicked, it adds that choice to the second list box to see the tally so to speak. What is the VB for getting something like this done? Thanks Justin

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• Storing date and time as epoch vs native datetime format in the database

  - by zakovyrya

  For most of my tasks I find it much easier to work with date and time in the epoch format: it's trivial to calculate timespan or determine if some event happened before or after another, I don't have to deal with time-zone issues if the data comes from different geographical sources, in case of scripting languages what I usually get from database when I request a datetime-typed column is a string that I need to parse in order to work with it. This list can go on, but for me in order to keep my code portable that's enough to ditch database's native datetime format and store date and time as integer. What do you guys think?

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• How can I reuse my javascript code between client and server?

  - by Chris Farmer

  I have some javascript code that includes an ANTLR-generated lexer and parser, and some associated syntax tree evaluation functionality. This code runs in the browser in my web app to support users who author code snippets which process scientific data. Now I'd like to do some additional background processing on the server using the same generated parser. I would prefer not to have to re-implement this stuff in C# and have multiple bits of code that did the exact same thing. Performance isn't as critical to me as eliminating duplication, since this is a background process. So, how can I call into my javascript code from C#? And how can I format my script so that it plays nicely with my .NET web app?

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• Topics and Interview Questions for PHP Developer

  - by Rachel

  What topics and interview questions should be covered in order to assess candidate for PHP Developer Position ?

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• UISegmentedControl register taps on selected segment

  - by Jongsma

  Hi, I have a segmented control where the user can select how to order a list. Works fine. However, I would like that when an already selected segment is tapped, the order gets inverted. I have all the code in place, but I don't know how to register the taps on those segments. It seems the only control event you can use is UIControlEventValueChanged, but that isn't working (since the selected segment isn't actually changing). Is there a solution for this? And if so, what is it? Thanks in advance!

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• How does the Licenses.licx based .Net component licensing model work?

  - by Gishu

  I've encountered multiple third part .Net component-vendors use a licensing scheme. On an evaluation copy, the components show up with a nag-screen or watermark or some such indicator. On a licensed machine, a Licenses.licx is created - with what appears to be just the assembly full name/identifiers. This file has to be included when the client assembly is built. How does this model work? Both from component-vendors' and users' perspective. What is the .licx file used for? Should it be checked in? We've had a number of issues with the wrong/right .licx file being checked in and what not

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• sti and polymorphic's

  - by Alexey Poimtsev

  Hi, I have problem with my code class Post < ActiveRecord::Base end class NewsArticle < Post has_many :comments, :as => :commentable, :dependent => :destroy, :order => 'created_at' end class Comment < ActiveRecord::Base belongs_to :commentable, :polymorphic => true, :counter_cache => true end And on attempt go get comments for some NewsArticle i see in logs something like Comment Load (0.9ms) SELECT "comments".* FROM "comments" WHERE ("comments"."commentable_id" = 1 and "comments"."commentable_type" = 'Post') ORDER BY created_at Strange that "commentable_type" = 'Post'. Whats wrong? PS: Rails 2.3.5 && ruby 1.8.7 (2010-01-10 patchlevel 249) [i686-darwin10]

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• Thinking Sphinx - sorting by a string attribute gets out of sync when changes are made

  - by Scott Brown

  I have a "restaurants" table with a "name" column. I've defined the following index: indexes "REPLACE(UPPER(restaurants.name), 'THE ', '')", :as => :restaurant_name, :sortable => true ... because I want to sort the restaurant names without respect to the prefix "The ". My problem is that whenever one of these records is updated (in any way) the new record jumps to the top of the sort order. If another record is updated, it also jumps ahead of the rest. I end up with two lists: a list of restaurants that have been updated since the last re-indexing and a list of those that haven't. Each respective list is in alphabetical order, but I don't understand why the overall list is getting segregated this way. I do have a delayed delta index set up, and I assume the issue is related to this.

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• Reducing piracy of iPhone applications

  - by Alex Reynolds

  What are accepted methods to reduce iPhone application piracy, which do not violate Apple's evaluation process? If my application "phones home" to provide the unique device ID on which it runs, what other information would I need to collect (e.g., the Apple ID used to purchase the application) to create a valid registration token that authorizes use of the application? Likewise, what code would I use to access that extra data? What seem to be the best available technical approaches to this problem, at the present time? (Please refrain from non-programming answers about how piracy is inevitable, etc.)

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• Is it a good practice to implement aggregate routes in Entity Framework 4?

  - by Kohan

  Having just started working on a new project using Entity Framework 4, I spoke to some of the other team that use NHibernate for advice. They implement aggregate routes on their entities, so instead of adding an order through the orders entity, they would add it through customer.order by having an addOrder method on customer. This is the approach I have taken but I am, alas, running into problems. These are issues that I hope to work out, but it got me thinking ... Is this a good way to work or am I fighting an uphill battle unnecessarily?

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• NHibernate: Mapping IList property

  - by Anry

  I have a table Order, Transaction, Payment. Class Order has the properties: public virtual Guid Id { get; set; } public virtual DateTime Created { get; set; } ... I added properties: public virtual IList<Transaction> Transactions { get; set; } public virtual IList<Payment> Payments { get; set; } These properties contain a record of tables [Transaction] and [Payment]. How to keep these lists in the database?

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