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• css override not working?

  - by Karin

  I have three tabs that change styles when clicked. class="active" gives the tab the same background as the tab content, while class="inactive" has another color. My problem is the text on the tabs, something's weird with the CSS. The default state of class="active" looks as it should, while the inactive tabs are underlined even though my CSS says text-decoration: none !important; and the clicked active tab text becomes extra bold (or maybe it's a shadow). Please look at my fiddle: http://jsfiddle.net/m8wQM/170/

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• manage date fields when are int in the db

  - by Luca Romagnoli

  Hi in my db there is a field "date_start" type integer. This is the part of form for this field <div class="editor-label"> <%: Html.LabelFor(model => model.date_start) %> </div> <div class="editor-field"> <%: Html.TextBoxFor(model => model.date_start, new { @class = "calendar" })%> <%: Html.ValidationMessageFor(model => model.date_start) %> </div> In the form i want that the field's format is date type. and memorize it in int type after calling a my function for the convertion. How can i manage it? thanks

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• runtime/compile time polymorphism

  - by dmadhavaraj

  Hi , In the below code , why b1.subtract() fails . Please explain me the reason ie., what happens in JVM while invoking that method . class Base { public void add() { System.out.println("Base ADD"); } } class Child extends Base { public void add(){ System.out.println("Child ADD"); } public void subtract() { System.out.println("Child Subtract"); } } class MainClass { public static void main(String args[]) { Base b1 = new Base(); Base b2 = new Child(); Child b3 = new Child(); b1.add(); b1.subtract(); // ?????????** b2.add(); b3.subtract(); } }

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• Grails: Duplicates & unique constraint validation

  - by rukoche

  OK here is stripped down version of what I have in my app Artist domain: class Artist { String name Date lastMined def artistService static transients = ['artistService'] static hasMany = [events: Event] static constraints = { name(unique: true) lastMined(nullable: true) } def mine() { artistService.mine(this) } } Event domain: class Event { String name String details String country String town String place String url String date static belongsTo = [Artist] static hasMany = [artists: Artist] static constraints = { name(unique: true) url(unique: true) } } ArtistService: class ArtistService { def results = [ [ name:"name", details:"details", country:"country", town:"town", place:"place", url:"url", date:"date" ] ] def mine(Artist artist) { results << results[0] // now we have a duplicate results.each { def event = new Event(it) if (event.validate()) { if (artist.events.find{ it.name == event.name }) { log.info "grrr! valid duplicate name: ${event.name}" } artist.addToEvents(event) } } artist.lastMined = new Date() if (artist.events) { artist.save(flush: true) } } } In theory event.validate() should return false and event will not be added to artist, but it doesn't.. which results in DB exception on artist.save() Although I noticed that if duplicate event is persisted first everything works as intended. Is it bug or feature? :P

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• GetValue on static field inside nested classes.

  - by Sir Gallahad

  Hi... I have the following class declared. I need to retreive the class structure and the static values without instanciate it. public MyClass() { public static string field = "Value"; public nestedClass() { public static string nestedField = "NestedValue"; } } I've successfuly used GetFields and GetNestedType to recover the class structure and GetValue(null) works fine on field, but not on nestedField. Let me sample: var fi = typeof(MyClass).GetField("field", BindingFlags.Public | BindingFlags.Static); var nt = typeof(MyClass).GetNestedType("nestedClass", BindingFlags.Public); var nfi = nt.GetField("nestedField", BindingFlags.Public | BindingFlags.Static); // All the above references are detected correctly var value = fi.GetValue(null); // until here everything works fine. value == "Value" var nestedValue = nfi.GetValue(null); // this one does not work!! Anyone knows why the last line does not work and how to work around? Thanks.

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• Dynamic validation in jquery

  - by mansoor

  $(document).ready(function(){ $('a[rel=addhint]').click(function(){ var html='<div><label>Hint</label>'; html+='<span class="input"><input type="text" size="30" class="text" name="hint"/><a href="#" rel="delhint">delete</a></span><br class="clear" /></div>'; $('div#hintTextContainer').append(html); bindDelHintAll(); return false; }); I want when a new text area include vadition of required field and max length will also apply on it.

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• Generics and reflection in Java

  - by Ragesh

  This is probably a very basic question, but I'm really new to generics in Java and I'm having a hard time altering my thought process from the way things are done in C#, so bear with me. I'm trying to build a generic repository in Java. I've created an IRepository interface that looks like this: public interface IRepository<T extends IEntity> And a Repository class that looks like this: public class Repository<T extends IEntity> implements IRepository<T> Now, from within the constructor of my Repository class, I'd like to be able to "divine" the exact type of T. For example, if I instantiated a repository like this: IRepository<MyClass> repo = new Repository<MyClass>(); I'd like to know that T is actually MyClass. This is trivial in C#, but obviously generics are a totally different beast in Java and I can't seem to find anything that would help me do this.

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• Possible for C++ template to check for a function's existence?

  - by andy

  Is it possible to write a C++ template that changes behavior depending on if a certain member function is defined on a class? Here's a simple example of what I would want to write: template<class T> std::string optionalToString(T* obj) { if (FUNCTION_EXISTS(T->toString)) return obj->toString(); else return "toString not defined"; } So if class T has "toString" defined then it uses it, otherwise it doesn't. The magical part that I don't know how to do is the "FUNCTION_EXISTS" part.

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• How Do I Select a `td` Element in a Row That Has a Checkbox That is Checked?

  - by Russ Bradberry

  I have a table that looks somethings like this: <table> <tr class="row even"> <td><input type="checkbox" /></td> <td class="name">foo</td> <td class="metric">22</td> </tr> ...etc What I want to do is get an array of all td.metric only in rows that have the checkbox checked. This didn't work out as expected: var ticks = $.map($("tr td input:checked td.metric"), function(v,i){ return ... });

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• Spring MVC 3.1 How to access HttpSession in Custom Authentication Provider (which implements AuthenticationProvider)

  - by user1506231

  My application calls a web service during the Authentication process (as shown in code below). How can I save some information in HttpSession during this process? This information like customer-account-number will be used in various other places in the application after the user is logged in. Is it possible to pass HttpSession parameter to the MyServiceManager's static login method? public class MyAuthenticationManager implements AuthenticationProvider { @Override public boolean supports(Class<? extends Object> authentication) { return authentication.equals(UsernamePasswordAuthenticationToken.class); } @Override public Authentication authenticate(Authentication authentication) { //MyServiceManager.login - makes a call to web service if(MyServiceManager.login(authentication.getName(), authentication.getCredentials().toString(), XXX_HTTP_SESSION_XXX)) { List<GrantedAuthority> authorities = new ArrayList<GrantedAuthority> (); authorities.add(new GrantedAuthorityImpl("ROLE_USER")); authorities.add(new GrantedAuthorityImpl("ROLE_SUPERVISOR")); return new UsernamePasswordAuthenticationToken(authentication.getName(), authentication.getCredentials(),authorities); } else { return null; } } }

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• Dynamic binding in C++

  - by chmike

  I'm implementing a CORBA like server. Each class has remotely callable methods and a dispatch method with two possible input, a string identifying the method or an integer which would be the index of the method in a table. A mapping of the string to the corresponding integer would be implemented by a map. The caller would send the string on the first call and get back the integer with the response so that it simply has to send the integer on subsequent calls. It is just a small optimization. The integer may be assigned dynamically on demand by the server object. The server class may be derived from another class with overridden virtual methods. What could be a simple and general way to define the method binding and the dispatch method ?

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• Can this be done with multiple inhertance?

  - by Milo

  Here is what I would like to do. Say I have Class Widget. I then create Button from Widget. I then create ModifiedWidget which re-implements certain functions of Widget. I then want Button to use ModifiedWidget rather than plain Widget. Is this possible to do some how? Thanks class Button : public Widget; class SuperButton : public Button, public ModifiedWidget; I'm just not sure if that would do what I want it to though.

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• Calculate average in each group

  - by Gokul

  I am using the following class class Country { int CountryID {get; set;} List<City> city {get; set;} } class City { int CountryID {get; set; } string city {get; set;} int sqkm {get; set;} } Here's is some sample data for Country and City Country US UK Canada City CityC CityF CityA CityB CityG CityD CityE I am populating using List<Country> countries = new List<Country> { new Country() { CountryID = "US", city = new List<City> { new City() {CountryID = "US", City ="CityF", sqkm = 2803 }, and so on Question 1: I want to use LINQ to find avg sq. km of land per country Eg: Canada - 2459 UK - 3243 US - 3564

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• IRepository with Inherited Classes

  - by Stacey

  In keeping with the Repository pattern of data input, I've a question in regards to using inherited classes. For instance, suppose I would have the class... class Employee IEmployeeRepository { Add(Employee employee); } This works fine, nothing wrong with it so far... but now let's say I continue on.. class Manager : Employee Okay, now let's assume that I never need to enter a manager different than an Employee? What's the best approach here? Would a scenario such as .. IEmployeeRepository { Add<T>(T employee) where T : Employee } Be the best approach, or do I need to abstract a different repository for each type?

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• jQuery .parent() does not work

  - by Misha Moroshko

  Why the following code fails with: Error: class_a_jquery_objects[0].parent is not a function ? HTML: <div> <div class='a b'></div> <div class='b c'></div> <div class='c a'></div> </div> <div id='log'></div> JS: $(function() { var class_a_jquery_objects = $(".a"); $("#log").append(class_a_jquery_objects.length + "<br />"); $("#log").append(class_a_jquery_objects[0] + "<br />"); $("#log").append(class_a_jquery_objects[0].parent() + "<br />"); });

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• Which Java library lets me initialize an object's properties from a properties file?

  - by Kjetil Ødegaard

  Is there a Java library that lets you "deserialize" a properties file directly into an object instance? Example: say you have a file called init.properties: username=fisk password=frosk and a Java class with some properties: class Connection { private String username; private String password; public void setUsername(String username) { this.username = username; } public void setPassword(String password) { this.password = password; } } I want to do this: Connection c = MagicConfigurator.configure("init.properties", new Connection()) and have MagicConfigurator apply all the values from the properties file to the Connection instance. Is there a library with a class like this?

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• AppFabric serialization problem.

  - by jandark

  I am trying cache a class instance with AppFabric but it return class instance with empty members. The reason is DataContract Attribute. My class is marked with [Serializable] and [DataContract(Name = "TestClass", Namespace = "CustomNameSpace.TestClass")] attributes. Problem solving if I mark all properties with DataMember or remove DataContract attribute. But I do not want to remove DataContract attributte because of other serialization needs (such as json or something else) Or I do not want to add DataMember attribute to other classes. (a lot of) Do you have any idea to solve that problem ? Thanks.

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• C++ template typedef

  - by Notinlist

  I have a class template<size_t N, size_t M> class Matrix { // .... }; I want to make a typedef which creates a Vector (column vector) which is equivalent to a Matrix with sizes N and 1. Something like that: typedef Matrix<N,1> Vector<N>; Which produces compile error. The following creates something similar, but not exactly what I want: template <int N> class Vector: public Matrix<N,1> { }; Is there a solution or a not too expensive workaround / best-practice for it? Thanks in advance!

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• C++ Why is the copy constructor implicitly called?

  - by ShaChris23

  Why is the Child class's copy constructor called in the code below? I mean, it automatically converts Base to Child via the Child copy constructor. The code below compiles, but shouldn't it not compile since I haven't provided bool Child::operator!=(Base const&)? class Base { }; class Child : public Base { public: Child() {} Child(Base const& base_) : Base(base_) { std::cout <<"should never called!"; } bool operator!=(Child const&) { return true; } }; void main() { Base base; Child child; if(child != base) std::cout << "not equal"; else std::cout << "equal"; }

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• Hibernate - why use many-to-one to represent a one-to-one?

  - by aberrant80

  I've seen people use many-to-one mappings to represent one-to-one relationships. I've also read this in a book by Gavin King and on articles. For example, if a customer can have exactly one shipping address, and a shipping address can belong to only one customer, the mapping is given as: <class name="Customer" table="CUSTOMERS"> ... <many-to-one name="shippingAddress" class="Address" column="SHIPPING_ADDRESS_ID" cascade="save-update" unique="true"/> ... </class> The book reasons as (quoting it): "You don't care what's on the target side of the association, so you can treat it like a to-one association without the many part." My question is, why use many-to-one and not one-to-one? What is it about a one-to-one that makes it a less desirable option to many-to-one? Thanks.

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• Beginner questions regarding Python classes.

  - by Andy

  Hi. I am new to Python so please don't flame me if I ask something too noobish :) 1. Consider I have a class: class Test: def __init__(self, x, y): self.x = x self.y = y def wow(): print 5 * 5 Now I try to create an object of the class: x = Test(3, 4) This works as expected. However, when I try to call the method wow(), it returns an error, which is fixed by changing wow() to: def wow(self) Why do I need to include self and if I don't, what does the method mean?2. In the definition of __init__: def __init__(self, x, y): self.x = x self.y = y Why do I need to declare x and y, when I can do this: def __init__(self): self.x = x self.y = y I hope I am being clear... Thanks for your time.

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• Passing an array argument from C# to a C++/CLI method

  - by jco

  I know only very little about C++/CLI, but I have a simple problem that needs a solution. I have a C++/CLI class method that takes a byte-array as a parameter. The array is of a pre-determined length, and can be allocated in C# beforehand. The array is supposed to be filled with data by the C++/CLI method. How do I declare the method and then call it from C#? I tried something like having the following in my C++/CLI class: public ref class C { public: void FillBytes(array<BYTE^>^ bytes); }; And then, in C#: o = new C(); var bytes = new byte[3]; o.FillBytes(bytes); But that didn't work at all :).

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• Beginning with Datampper, Association question

  - by Ian

  I'm just diving into Datamapper (and Sinatra) and have a question about associations. Below are some models I have. This is what I want to implemented. I'm having an issue with Workoutitems and Workout. Workout will be managed separately, but Workoutitems has a single workout associated with each row. Workout - just a list of types of workouts (run, lift, situps, etc) Selected workout - this is the name of a set of workouts, along with notes by the user and trainer. It has a collection of N workoutitems Workoutitems - this takes a workout and a number of repetitions to it that go in the workout set. class Workout include DataMapper::Resource property :id, Serial #PK id property :name, String, :length=50,:required=true # workout name property :description, String, :length=255 #workout description end class Selectedworkout include DataMapper::Resource property :id, Serial property :name, String, :length=50, :required=true property :workout_time, String, :length=20 property :user_notes, String, :length=255 property :coach_notes, String, :length=255 has n, :workoutitems end class Workoutitem include DataMapper::Resource property :id, Serial property :reps, String, :length=50, :required=true belongs_to :selectedworkout end

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• How are value types implemented in .NET

  - by Michael

  Been looking around the net and can't find any articles about how value types are actually implemented. For instance, an Int32 is a struct and it's direct parent is System.ValueType and that's ultimate parent is System.Object. Object is a class - I imagine ValueType is a class? What's the class hierarchy? What part does the CLR have to play? At what stage and how does the CLR know to allocate value types to the stack? (FYI, I am aware that value types are stored where they are declared).

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• Get other classes from an element with Jquery

  - by Jigs

  I am working on a small bit of script that will allow for easy and flexible creation of buttons. My buttons are made of three parts, a left, a right and a streched middle piece. There are three different sizes and three different colours of each. I have written the code that resizes the button to fit the text. Now I am looking to add the ability to easily set the colour and size. I was thinking of using three classes something like <div class="button blue big"> My script already loops through the button classes using each. Now I need to find out what other classes are set and adjust the pictures and dimentions used to fit. So how can I find out what other class selectors an element has? Also I am fairly new to jquery/javascript so I am wondering if storing the design as class selectors is the best way.

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