Tutorial by Examples: er

Tooltip pointer example

$color-purple-bg: #AF6EC4; $color-purple-border: #5D0C66; $color-yellow-bg: #E8CB48; $color-yellow-border: #757526; .tooltip { position: relative; &--arrow-down { @include pointer('bottom', 30px, ($color-purple-border, $color-purple-bg), 15px); } ...

Edit - Controller part

// GET: Student/Edit/5 // It is receives a get http request for the controller Student and Action Edit with the id of 5 public ActionResult Edit(int? id) { // it good practice to consider that things could go wrong so,it is wise to have a validation in the controller ...

Void Generator

The void generator class: public class VoidGenerator extends ChunkGenerator { @SuppressWarnings("deprecation") public byte[] generate(World w, Random rand, int x, int z) { byte[] result = new byte[32768]; //chunksized array filled with 0 - Air //Build a...

Detect errors when reading data on Android

A frequent reason why your read operation may not work is because your security rules reject the operation, for example because you're not authenticated (by default a database can only be accessed by an authenticated user). You can see these security rule violations in the logcat output. But it's e...

Using JavaScript Interop

(ns so-doc.events) (enable-console-print!) (defn click-event [] (println "Button clicked")) (defn load-event [] (println "Page loaded!") (.addEventListener (.getElementById js/document "btn") "click" click-event false)) (.addEventListener ...

Using different Properties/Configuration for different environments like dev, qa, staging etc.

Large scale applications often need different properties when running on different environments. we can achieve this by passing arguments to NodeJs application and using same argument in node process to load specific environment property file. Suppose we have two property files for different enviro...

Builder Pattern

Separate the construction of a complex object from its representation so that the same construction process can create different representations and and provides a high level of control over the assembly of the objects. In this example demonstrates the Builder pattern in which different vehicles ar...

Prototype Pattern

Specify the kind of objects to create using a prototypical instance, and create new objects by copying this prototype. In this example demonstrates the Prototype pattern in which new Color objects are created by copying pre-existing, user-defined Colors of the same type. using System; using Syste...

Abstract Factory Pattern

Provide an interface for creating families of related or dependent objects without specifying their concrete classes. In this example demonstrates the creation of different animal worlds for a computer game using different factories. Although the animals created by the Continent factories are diffe...

Code that will always/never be executed

if true; then echo Always executed fi if false; then echo Never executed fi

contact_picker.cs

using System; using Xamarin.Forms; namespace contact_picker { public class App : Application { public App () { // The root page of your application MainPage = new MyPage(); } protected override void OnStart () ...

ChooseContactPicker.cs

using System; using Xamarin.Forms; namespace contact_picker { public class ChooseContactPage : ContentPage { public ChooseContactPage () { } } }

ChooseContactRenderer.cs

using UIKit; using AddressBookUI; using Xamarin.Forms; using Xamarin.Forms.Platform.iOS; using contact_picker; using contact_picker.iOS; [assembly: ExportRenderer (typeof(ChooseContactPage), typeof(ChooseContactRenderer))] namespace contact_picker.iOS { public partial class Choose...

Common HTML Operations

If the input HTML DOM is <html> <body> <a>link</a> <div class='container' id='divone'> <p class='common' id='enclosedone'>Element One</p> <p class='common' id='enclosedtwo'>Element Two</p> ...

Convert px to (r)em

To convert px to em or rem you can use the following function: @function rem-calc($size, $font-size : $font-size) { $font-size: $font-size + 0px; $remSize: $size / $font-size; @return #{$remSize}rem; } @function em-calc($size, $font-size : $font-size) { $font-size: $font-siz...

Bilateral Filtering

In image processing applications, the bilateral filters are a special type of non-linear filters. There is a trade off between loosing structure and noise removal, because the most popular method to remove noise is Gaussian blurring which is not aware of structure of image; therefore, it also remov...

Creating custom interceptors

Interceptors require the IInterceptor interface. Any public method within the intercepted class will be intercepted (including getters and setters) public class MyInterceptor : IInterceptor { public void Intercept(IInvocation invocation) { //Calls the next method in the chain - T...

Hello World in the browser with SystemJS

Install systemjs and plugin-typescript npm install systemjs npm install plugin-typescript NOTE: this will install typescript 2.0.0 compiler which is not released yet. For TypeScript 1.8 you have to use plugin-typescript 4.0.16 Create hello.ts file export function greeter(person: String) { ...

Accessing a filtered list from outside an ng-repeat

Occasionally you will want to access the result of your filters from outside the ng-repeat, perhaps to indicate the number of items that have been filtered out. You can do this using as [variablename] syntax on the ng-repeat. <ul> <li ng-repeat="item in vm.listItems | filter:vm.myF...

Database First in Entity Framework Core with a Class Library and SQL Server

Okay it took me about a day to figure it out so here I am posting the steps I followed to get my Database First working in a Class Project (.NET Core), with a .NET Core Web App. Step 1 - Install .NET Core Make Sure you are using .NET Core not DNX (Hint: You should be able to see the .NET Core opti...

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