lazy-loading

问题 Is it possible to initialize the Instance of a Singleton when it is really needed? Consider this pattern taken from the famous "Design Patterns": class Singleton { public: static Singleton* Instance(); protected: Singleton(); private: static Singleton* _instance; } Singleton* Singleton::_instance = 0; // unit.cpp static Singleton* Singleton::Instance() { if (_instance == 0) { _instance = new Singleton; } return _instance; } Now, I think there is a problem in the pattern there, if one desires

问题 I have a list that I am loading lazily - only 10 items at a time. When the user scrolls to the bottom another 10 are loaded etc. However I also want to have an option of searching for an item within the full list - not the lazy list. My list exists on client side but is 900+ items and rendering takes long. How can i keep my list displayed lazily but have the search box filter items from my full list. *I am hoping that creating my on custom search with ng-change() is not my only option Here is

问题 In my Angular App, I have a parent component : console.component.html <div class="main"> <ibe-snackbar></ibe-snackbar> <router-outlet></router-outlet> </div> routler-outlet can load two child component. One is loaded eagerly the other one is loaded with lazy loading. Here's the routes file console.component.routes const ConsoleRoutes: Routes = [ { path: 'console', component: ConsoleComponent, data: {context : CONSOLE_CONTEXT}, children: [ { path: "projects", component: ProjectsListComponent,

问题 I have a project with a angular version of 4. *. \ *. I tried to update the project to 6 angular versions. I fixed all the errors that the compiler told me when I build a prod. There were a lot of them. Now the project compiles without errors, but it does not work in the browser. And now I'm stuck. Can someone help me with this problem? I think this is somehow connected with lazy loading, but I have not been able to find a solution for a long time. Added a code that can help in the answer. If

问题 I would like to create a multilingual app with React. The way I see it would be to have a js file for each language, for example : en.js: module.exports = { langEnglish: 'English', langFrench: 'French', navHome: 'Home', navUsers: 'Users', ... }; fr.js: module.exports = { langEnglish: 'Anglais', langFrench: 'Français', navHome: 'Accueil', navUsers: 'Utilisateurs', ... }; As each language file will be quite big and there could be dozens of different languages supported, I would prefer to

问题 I have problem to let user know about exceptions occurred in PrimeFaces LazyDataModel#load method. I am loading there data from database and when an exception is raised, I have no idea how to inform the user about it. I tried to add FacesMessage to FacesContext , but message is not shown on the Growl component, even if Growl is set to autoUpdate="true" . Using PrimeFaces 3.3. 回答1: It doesn't work because load() method is invoked during Render Response phase (you can check this by printing

问题 I used this method before. <iframe data-src="https://youtube.com/...?autoplay=1"></iframe> On event with javascript I turned the data-src to src and the video started to play. I had browser caching problems with that, videos autoplaying in background (I load a thumbnail in place for the actual iframe) when going back in the browser. Because of that I switched to a method where I just load the iframe inside a comment <!--<iframe src="https://youtube.com/...?autoplay=1"></iframe>--> and then

问题 i'm using Angular2 and SystemJS to create a web application. I have some modules in my app and in the router configuration i use lazy loading to open them. Here is a routing file of my app that lazy loads two modules: const appRoutes: Routes = [ { path: '', component: MainComponent, canActivate: [AuthGuard], children: [ { path: 'dashboard', component: DashboardComponent }, { path: 'first-section', loadChildren: 'app/modules/FIRST-SECTION/first-section.module' }, { path: 'second-section',

问题 I would like to use Plupload in an Angular2 component and access the Plupload JavaScript file from a CDN. I want it specific to a component so that it is not downloaded if it is not required - I want it to be in a lazy loaded module. How can I do this? Now fully answered on this page! The result of this quest, which included offering and awarding bounties to two people who worked hard with me on it, is as follows: Example of using Plupload with Angular 2 and TypeScript How to Lazy load a

问题 I can lazy load one-to-many and many-to-one associations but I can't with the many-to-many associations. We have a city in wich we have merchants wich have adresses. Merchants can have multiple addresses and multiple merchants can have the same addresses. When we load a merchant with a get, Merchant merchant = (Merchant) hib_session.get(Merchant.class, id); System.out.println(merchant.getName()); it's ok, addresses aren't load until we iterate over them. But when we load a list of merchants,