methods

问题 Assume I have an object with a member function that returns itself: /* -- Object 1 -- */ function Object1(){ this.me = new Image(10,10); this.me.src = "someImgUrl.jpg"; this.publish = function(){ return this.me; } } In production: var Obj1 = new Object1(); document.body.appendChild( Obj1.publish() ); Now, suppose I wanted to create an event that fires when the object's publish() method is called, but after the image is returned (something akin to an "onPublished()" event). Say, to to change

问题 I am trying to write a class method in Objective C. The project builds fine when I declare the method. But the build fails whenever I try to call the method. Here is my code. Header File #import <UIKit/UIKit.h> @interface LoginViewController : UIViewController { //Declare Vars } - (IBAction) login: (id) sender; + (NSString *) md5Hash:(NSString *)str; @end Source File + (NSString *) md5Hash:(NSString *)str { const char *cStr = [str UTF8String]; unsigned char result[16]; CC_MD5( cStr, strlen

问题 I have code that looks like follows: public interface BaseDAO{ // marker interface } public interface CustomerDAO extends BaseDAO{ public void createCustomer(); public void deleteCustomer(); public Customer getCustomer(int id); // etc } public abstract class DAOFactory { public BaseDAO getCustomerDAO(); public static DAOFactory getInstance(){ if(system.getProperty("allowtest").equals("yes")) { return new TestDAOFactory(); } else return new ProdDAOFactory(); } public class TestDAOFactory

问题 I'm searching for a way to get a list of method stubs of all classes within a jar file. I'm not sure where to start... May I use Reflection or Javassist or some other tools of which I've not heard yet!? At least it may be possible to unpack the jar, decompile the class files and scan with a line parser for methods, but I think that is the most dirtiest way ;-) Any ideas? Kind Regards 回答1: Building upon aioobe's answer, you can also use ASM's tree API (as opposed to its visitor API) to parse

问题 HI, I 'm trying to sort the rows in my datatable using select method. I know that i can say datatable.select("col1='test'") which in effect is a where clause and will return n rows that satisfy the condition. I was wondering can i do the following datatable.select("ORDER BY col1") ---col1 is the name of hte column I tried datatable.defaultview.sort() but didnt work Any ideas on how to get around this issue. thanks 回答1: Have you tried using the DataTable.Select(filterExpression, sortExpression

问题 I'm working with activemerchant and it raise me this error when validating the card is this ok in rails 3? thank you in advance more power to all belongs_to :reservation attr_accessor :card_number, :card_verification validate :validate_card, :on => :create def validate_card unless credit_card.valid? credit_card.errors.full_messages.each do |message| errors.add_to_base "error" end end end def credit_card @credit_card ||= ActiveMerchant::Billing::CreditCard.new( :type => card_type, :number =>

问题 How do I write the method for user authentication in REST web service? I am beginner with web services. 回答1: Authentication itself should be done in a stateless way, so that the REST paradigm is not broken. This means authentication has to occur on every request. this SO question might provide some further details the esiest method is using HTTP-Basic AUTH (rfc2617) over SSL encrypted connections (https). here are some java examples: ericonjava my blog entry another method is using nonces so

问题 I was wondering, aside from syntactic difference, when would one use a generic interface over a method that accepts a generic parameter? public interface Flight<T>{ void fly(T obj); } over public interface Flight{ void <T> fly(T obj); } 回答1: If you declare a generic method , you always let the caller decide, which type arguments to use for the type parameters. The implementation of the method must be able to deal with all possible types arguments (and it doesn’t even have a way to ask for the

问题 i want to detect a rotation process on ipad programmatically. In this case i want to set a boolean into yes, when the rotation will begin, and set it false after the rotation did ending. Is there any method that called when the rotation will begin and the rotation did ending? 回答1: From Apple Docs: Sent to the view controller just before the user interface begins rotating. - (void)willRotateToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation duration:(NSTimeInterval)duration

问题 I'm trying to create a simple link that will allow an admin to approve a user on my website quite similar to what this guy was trying : In Rails 3 how do I use button_to to change the value of a boolean? Here's how it was supposed to work : Admin clicks the link to approve a user The link calls the activate function in UsersController The active function calls that users model the user model updates the approved attribute to true and saves it and here's how I was going to do it in my users