Check if a class `active` exist on element with jquery
I think you want to use hasClass() $(‘li.menu’).hasClass(‘active’);
class
@MAPSTRUCT. No property named “packaging” exists in source parameter(s)
For those, who have the same issue when using mapstruct + lombok: I had the same issue. The reason was that I’ve been using Lombok plugin too. There’s no need to remove it, but you have to ensure that in pom.xml in <annotationProcessorPaths> Lombok tag is before the Mapstruct one. Example (part of pom.xml file): … Read more
Android Studio says: duplicate class found
just add implementation(platform(“org.jetbrains.kotlin:kotlin-bom:1.8.0”)) in dependencies it solved my problem.
Toggle between two classes in jQuery
How about $(YOUR_ELEMENT).live(“EVENT_NAME”, function() { $(“.portlet-header”).toggleClass(“ui-icon-plus”).toggleClass(“ui-icon-minus”); }); Even more shorter $(YOUR_ELEMENT).live(“EVENT_NAME”, function() { $(“.portlet-header”).toggleClass(“ui-icon-plus ui-icon-minus”); }); EDIT As of jQuery 1.7, the .live() method is deprecated. Use .on() to attach event handlers. Users of older versions of jQuery should use .delegate() in preference to .live(). jQuery API reference
Typescript, using classes without constructor
You can use class as a type which is the way you’re using it. So, whether Hero is an interface or class it doesn’t matter because you’re using it as a type. class Hero { id: number; name: string } or interface Hero { id: number; name: string } The following doesn’t concern whether Hero … Read more
Why duck typing is allowed for classes in TypeScript
This is the way structural typing works. Typescript has a structural type system to best emulate how Javscript works. Since Javascript uses duck typing, any object that defines the contract can be used in any function. Typescript just tries to validate duck typing at compile time instead of at runtime. Your problem will however only … Read more
Typescript class: “Overload signature is not compatible with function implementation”
You get that compilation error because the signature of the implementation function does not satisfy the empty constructor you declared. As you want to have the default constructor, it should be: class MyItem { public name: string; public surname: string; public category: string; public address: string; constructor(); constructor(name:string, surname: string, category: string, address?: string); constructor(name?: … Read more
Access parent class instance attribute from child class instance?
Parent is a class – blue print not an instance of it, in OOPS to access attributes of an object it requires instance of the same, Here self/child is instance while Parent/Child are classes… see the answer below, may clarify your doubts. class Parent(): def __init__(self): self.myvar = 1 class Child(Parent): def __init__(self): Parent.__init__(self) # … Read more
Is it possible for class to inherit the annotations of the super class
Yes it is possible if the annotation has @Inherited added to it. For example, the @Transactional annotation has @Inherited. From the docs: Indicates that an annotation type is automatically inherited. If an Inherited meta-annotation is present on an annotation type declaration, and the user queries the annotation type on a class declaration, and the class … Read more
C++ class forward declaration
Use forward declaration when possible. Suppose you want to define a new class B that uses objects of class A. B only uses references or pointers to A. Use forward declaration then you don’t need to include <A.h>. This will in turn speed a little bit the compilation. class A ; class B { private: … Read more