Tutorial by Examples: re

Replacing fragments with ajax

If you want to replace parts of your website, ajax is an easy way to do it. The website.html where you want to replace the content based on the selected value: <!DOCTYPE html> <html xmlns="http://www.w3.org/1999/xhtml" xmlns:th="http://www.thymeleaf.org"> ...

thymeleaf • Getting started with thymeleaf

Access to Request in a Twig or PHP template.

In Twig template, Request object is available at {{ app.request }} When you want display request method in Twig, try this: <p>Request method: {{ app.request.method }}</p> In PHP template <p>Request method: <?php echo $app->getRequest()->getMethod() ?></p>...

symfony2 • Request

Secure your WebApp with Login and Logout

This example is a very simple Spring Boot application. Maven Dependencies At first add the following dependencies to your project. Spring Initializr is recommended when you create a new project. <parent> <groupId>org.springframework.boot</groupId> <artifactId>spr...

thymeleaf • Spring Security and Thymeleaf

Reshape from wide to long format with gather()

library(tidyr) ## example data df <- read.table(text =" numbers firstName secondName 1 1 1.5862639 0.4087477 2 2 0.1499581 0.9963923 3 3 0.4117353 0.3740009 4 4 -0.4926862 0.4437916", header = T) df # numbers firstName secondName # 1 ...

R Language • Reshape using tidyr

Creating a video with OpenCV (Java)

VideoWriter videoWriter; videoWriter = new VideoWriter(outputFile, VideoWriter.fourcc('x', '2','6','4'), fps, frameSize, isRGB); //We have stated that we will use x264 as codec with FourCC //For writing, we add the following method and it will write the image we give as parameter...

opencv • Creating a Video

Using Blocks for Recurring Elements

One of the most useful things that came along with sections is blocks. Blocks are basically a blueprint for something that can be created an unlimited amount of times. One of the best examples is the slides of a slider. A block is a top level item in the schema, meaning it is alongside things like n...

Shopify • Implementing Sections

Entities and Repositories

A simple entity: Using Lombok @Getter and @Setter annotations to generate getters and setters for us @Entity @Getter @Setter public class Message { @Id @GeneratedValue(generator = "system-uuid") @GenericGenerator(name = "system-uuid", strategy = "uuid...

spring-boot • Spring boot + Hibernate + Web UI (Thymeleaf)

Thymeleaf Resources and Spring Controller

In order to expose Thymeleaf templates we need to define controllers. Example: @Controller @RequestMapping("/") public class MessageController { @Autowired private MessageRepository messageRepository; @GetMapping public ModelAndView index() { It...

spring-boot • Spring boot + Hibernate + Web UI (Thymeleaf)

Configure restriction access when Docker daemon starts

Work in progress

Docker • Iptables with Docker

Avoid memory leaks with Anonymous Class, Handler, Timer Task, Thread

In android, every developer uses Anonymous Class (Runnable) at least once in a project. Any Anonymous Class has a reference to its parent (activity). If we perform a long-running task, the parent activity will not be destroyed until the task is ended. Example uses handler and Anonymous Runnable cla...

Android • Memory Leaks

Named actions that can be started or removed from elsewhere.

Sometimes you would want to start or remove an action on a specific node at a certain time. For example, you might want to stop a moving object when the user taps the screen. This becomes very helpful when a node has multiple actions and you only wants to access one of them. let move = SKAction.mov...

sprite-kit • SKAction

Making Your Machine Ready for Building!

Before you can build anything, you are required to make your machine ready for building. For this you need to install a lot of libraries and modules. The most recommended Linux distribution is Ubuntu, so this example will focus on installing everything that is needed on Ubuntu. Installing Java Fir...

Android • Create Android Custom ROMs

Printing the title with code before and after

Code the_title( '<h1>', '</h1>' ); Output The title of the current post or page in h1 tags

WordPress • the_title()

Responsive image using picture element

Code <picture> <source media="(min-width: 600px)" srcset="large_image.jpg"> <source media="(min-width: 450px)" srcset="small_image.jpg"> <img src="default_image.jpg" style="width:auto;"> </picture> ...

HTML • Images

Automatically map custom model to data structure

After you have set a few data to database and have get a structure consisting of several nodes like this; "user" : { "-KdbKcU2ptfYF2xKb5aO" : { "firstName" : "Arthur", "lastName" : "Schopenhauer", "userName&q...

firebase-database • Getting started with firebase-database

Create custom Error with localized description

Create enum of custom errors enum RegistrationError: Error { case invalidEmail case invalidPassword case invalidPhoneNumber } Create extension of RegistrationError to handle the Localized description. extension RegistrationError: LocalizedError { public var errorDescription...

Swift Language • Error Handling

JsonResponse

Return JSON formated response: use Symfony\Component\HttpFoundation\JsonResponse; public function someAction(){ // Action's code $data = array( // Array data ); return new JsonResponse($data); }

symfony2 • Response

Create a table that references other table.

In this example, User Table will have a column that references the Agency table. CREATE TABLE agencies ( -- first create the agency table id SERIAL PRIMARY KEY, name TEXT NOT NULL ) CREATE TABLE users ( id SERIAL PRIMARY KEY, agency_id NOT NULL INTEGER REFERENCES agencies(id) DEFERR...

postgresql • Table Creation

Re-export

Typescript allow to re-export declarations. //Operator.ts interface Operator { eval(a: number, b: number): number; } export default Operator; //Add.ts import Operator from "./Operator"; export class Add implements Operator { eval(a: number, b: number): number { ...

TypeScript • Modules - exporting and importing

Java 8 features subset with Retrolambda

Retrolambda lets you run Java 8 code with lambda expressions, method references and try-with-resources statements on Java 7, 6 or 5. It does this by transforming your Java 8 compiled bytecode so that it can run on an older Java runtime. Backported Language Features: Lambda expressions are back...

Android • Java on Android