lazy-loading | 易学教程

Lazy loading UITableView with multiple images in each cell

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问题 I am using lazy loading to show images on a table view. But I need to create a tableview with multiple images in every cell.Which can be scrolled. All images are loaded from server only How can I create this without any lagging for table scrolling ? Is there any tutorial available for this 回答1: Try this code. SDWebImage. It downloads image from server and save it to device cache. Also if you don't want save it to cache then you might have a look at AFNetworking . 回答2: There is another option.

How to test whether lazy loaded JPA collection is initialized?

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I have a service that gets a JPA entity from outside code. In this service I would like to iterate over a lazily loaded collection that is an attribute of this entity to see if the client has added something to it relative to the current version in the DB. However, the client may have never touched the collection so it's still not initialized. This results in the well known org.hibernate.LazyInitializationException: failed to lazily initialize a collection of role: com.example.SomeEntity. Of course, if the client never touched the collection, my service doesn't have to check it for possible

Java JDBC Lazy-Loaded ResultSet

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Is there a way to get a ResultSet you obtain from running a JDBC query to be lazily-loaded? I want each row to be loaded as I request it and not beforehand. Short answer: Use Statement.setFetchSize(1) before calling executeQuery() . Long answer: This depends very much on which JDBC driver you are using. You might want to take a look at this page , which describes the behavior of MySQL, Oracle, SQL Server, and DB2. Major take-aways: Each database (i.e. each JDBC driver) has its own default behavior. Some drivers will respect setFetchSize() without any caveats, whereas others require some "help"

Stop loading of images with javascript (lazyload)?

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问题 I am trying to stop the loading of images with javascript on dom ready and then init the loading whenever i want, a so called lazy loading of images. Something like this: $(document).ready(function () { var images = $('img'); $.each(images, function() { $(this).attr('src', ''); }); }); This doesn't work (tested in ff3.5, safari 3-4). The images is getting loaded anyway, i dont get it. For example this plugin, www.appelsiini.net/projects/lazyload, is doing the exact same thing, removing the

Angular 5: Lazy-loading of component without routing

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问题 In my web application I have a "Terms and Conditions" popup that opens by link click in the footer (so it's a core component). Popup comprises of several tabs, each of them is a pretty big template file. I wonder if it's possible to move tab templates to separate chunk and organize their lazy-loading? I'm not sure if default Angular lazy-loading is acceptable for me because I don't want to have separate route for the popup. 回答1: You can wait for the user to click on the link and as soon as

how to apply the load on demand (Lazy loading) concept in datalist for Images using asp.net?

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问题 In my asp.net application have one data list, page load event I have to bind number of image items(1000), how to apply the load on demand (What you can say Lazy loading of images) (when scrolling the page that time only bind the items like facebook new needs page) Basically I don't want page load delay due to no of images and their loading time. my code is page load event get the data and bind the datalist SqlCommand comd = new SqlCommand("usp_GetSubCategoryProducts", OBcon); comd.CommandType

Java lazy loading of enum instances

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问题 If I have a bunch of enum instances in an enum type, and if I access an instance of it the first time, all of its remaining instances too are initialized at the same time. Is there any way to initialize an enum instance only when it's accessed the first time? 回答1: Not without basically making it not an enum anymore. Enums are classes. The first time a class is used, it gets loaded by the JVM and all of its static initialization is done. Setting up the enum members is a static initialization,

Implementing “withDelay” in Picasso Android (for skimming)

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When dealing with many scrolling images, you have to avoid the problem of loading while skimming, while the user is fast scrolling. The simplest and often best solution is remarkably simple: just introduce a small delay (say .350) before doing anything . If the image is already in cache, just load it. Otherwise just wait a bit - and then proceed totally normally. With the magnificent Picasso, depressingly it looks like there is a fork which in fact does just this, it has a "withDelay" option** (see https://github.com/square/picasso/issues/248 ) I'm scared of forks. But is it possible to do

NHibernate creates proxy via session.Load(), but not via Linq or Criteria API

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问题 I have an odd problem in my current project. Lazy loading for queries does not work. When I query a list, nhibernate fetches all associations separately. I extracted small parts of it and put it into a separate solution. Basically what I've got now, is a Account-Table and a AccountSync-Table. Both have an ID and a URL, while the ID is just a db-guid. My classes are: public class HippoAccount { public virtual Guid Id { get; set; } public virtual string Url { get; set; } public virtual

Lazy loading not working for many-to-one relationship when mapping to a non-key field using property-ref

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问题 I have a legacy database that I am mapping using NHibernate. The objects of concern are an Account and a list of Notification objects. The objects look like: public class Notification { public virtual int Id { get; set; } public virtual DateTime BatchDate { get; set; } /* other properties */ public virtual Account Account { get; set; } } public class Account { public virtual int Id { get; set; } public virtual string AccountNumber { get; set; } /* other properties */ } The mapping files look