Tutorial by Examples: d

Demonstration of the Flash Scope usage

Bean1 @ManagedBean @ViewScoped public class Bean1 implements Serializable { /** * Just takes the given param, sets it into flash context and redirects to * page2 * * @param inputValue * @return */ public String goPage2(String inputValue) { ...

jsf • The Flash Scope in JSF 2

Computed Observables

Computed observables are functions that can "watch" or "react" to other observables on the view model. The following example shows how you would display the total number of users and the average age. Note: The example below can also make use of pureComputed() (introduced in v3....

knockout.js • Getting started with knockout.js

How to add Firebase Crash Reporting to your app

In order to add Firebase Crash Reporting to your app, perform the following steps: Create an app on the Firebase Console here. Copy the google-services.json file from your project into your in app/ directory. Add the following rules to your root-level build.gradle file in order to inc...

Android • Firebase Crash Reporting

"anonymous object" + "dynamic keyword" solution

You can return an anonymous object from your function public static object FunctionWithUnknowReturnValues () { /// anonymous object return new { a = 1, b = 2 }; } And assign the result to a dynamic object and read the values in it. /// dynamic object dynamic x = FunctionWithUnknowR...

C# Language • Function with multiple return values

Parse and TryParse with culture info

You might want to use it when parsing DateTimes from different cultures (languages), following example parses Dutch date. DateTime dateResult; var dutchDateString = "31 oktober 1999 04:20"; var dutchCulture = CultureInfo.CreateSpecificCulture("nl-NL"); DateTime.TryParse(dutch...

C# Language • DateTime Methods

Defining a Structure and Accessing Structure Members

The format of the struct statement is this: struct [structure tag] { member definition; member definition; ... member definition; } [one or more structure variables]; Example: declare the ThreeFloats structure: typedef struct { float x, y, z; } ThreeFloats; @inter...

Objective-C Language • Structs

REMOTE HOST IDENTIFICATION HAS CHANGED!

The common error using ssh is to see the error like @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ @ WARNING: REMOTE HOST IDENTIFICATION HAS CHANGED! @ @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ IT IS POSSIBLE THAT SOMEONE IS DOING SOMETHING NASTY! Someone c...

Secure Shell • Debugging ssh problems

Global Factory Function to Emulate a Parameterized Constructor

' Making a factory with parameter to the class Public Function new_Car(wheels) Set new_Car = New Car new_Car.Wheels = wheels End Function ' Creating a car through a factory Dim semiTrailer Set semiTrailer = new_Car(18)

vbscript • Using Classes

Load HTML string

Web views are useful to load locally generated HTML strings. NSString *html = @"<!DOCTYPE html><html><body>Hello World</body></html>"; [webView loadHTMLString:html baseURL:nil]; Swift let htmlString = "<h1>My First Heading</h1><p&gt...

iOS • UIWebView

Standard form vs Elvis form

// long form String sayHello(String name){ "Hello, ${name ? name : 'stranger'}." } // elvis String sayHello(String name){ "Hello, ${name ?: 'stranger'}." } Notice that the "elvis" format omits the "true" term because the original comparison...

groovy • Ternary and Elvis Operators

Designing and drawing a Bezier Path

This example shows the process from designing the shape you want to drawing it on a view. A specific shap is used but the concepts you learn can be applied to any shape. How to draw a Bézier path in a custom view These are the main steps: Design the outline of the shape you want. Divide the ou...

iOS • UIBezierPath

Getting and Setting the Cursor Postition

Useful information The very beginning of the text field text: let startPosition: UITextPosition = textView.beginningOfDocument The very end of the text field text: let endPosition: UITextPosition = textView.endOfDocument The currently selected range: let selectedRange: UITextRange? = textV...

iOS • UITextView

Creating a UIBarButtonItem in the Interface Builder

The example below shows how to add a navigation bar button (called a UIBarButtonItem) in the Interface Builder. Add a Navigation Controller to your Storyboard Select your View Controller and then in the Xcode menu choose Editor > Embed In > Navigation Controller. Alternatively, you could ...

iOS • UIBarButtonItem

PHPUnit Data Providers

Test methods often need data to be tested with. To test some methods completely you need to provide different data sets for every possible test condition. Of course, you can do it manually using loops, like this: ... public function testSomething() { $data = [...]; foreach($data as $dat...

PHP • Unit Testing

Create an Xamarin Forms custom input control (no native required)

Below is an example of a pure Xamarin Forms custom control. No custom rendering is being done for this but could easily be implemented, in fact, in my own code, I use this very same control along with a custom renderer for both the Label and Entry. The custom control is a ContentView with a Label, ...

Xamarin.Forms • Creating custom controls

Make an Image tappable by adding a TapGestureRecognizer

There are a couple of default recognizers available in Xamarin.Forms, one of them is the TapGestureRecognizer. You can add them to virtually any visual element. Have a look at a simple implementation which binds to an Image. Here is how to do it in code. var tappedCommand = new Command(() => {...

Xamarin.Forms • Gestures

Show all of the zoomed Image content with the PanGestureRecognizer

When you have a zoomed Image (or other content) you may want to drag around the Image to show all of its content in the zoomed in state. This can be achieved by implementing the PanGestureRecognizer. From code this looks like so: var panGesture = new PanGestureRecognizer(); panGesture.PanUpdated...

Xamarin.Forms • Gestures

Basic Binding to ViewModel

EntryPage.xaml: <?xml version="1.0" encoding="utf-8" ?> <ContentPage xmlns="http://xamarin.com/schemas/2014/forms" xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml" xmlns:vm="clr-namespace:MyAssembly.ViewModel;a...

Xamarin.Forms • Data Binding

Valid Keys

Redis keys are binary-safe, so literally anything can be used as a key. The only limitations are that they must be less than 512MB. Examples of valid keys: 7 ++++ `~!@#$%^&*()-_=+ user:10134 search/9947372/?query=this%20is%20a%28test%29%20query <div id="div64"> Any othe...

redis • Redis Keys

Adding a map in Xamarin.Forms (Xamarin Studio)

You can simply use the native map APIs on each platform with Xamarin Forms. All you need is to download the Xamarin.Forms.Maps package from nuget and install it to each project (including the PCL project). Maps Initialization First of all you have to add this code to your platform-specific project...

Xamarin.Forms • Working with Maps