Tutorial by Examples: r

AfterViewChecked

Fire after the check of the view, of the component, has finished. (Only available for components) import { Component, AfterViewChecked } from '@angular/core'; @Component({ selector: 'so-afterviewchecked-component', templateUrl: 'afterviewchecked-component.html', styleUrls: ['afte...

Angular 2 • Lifecycle Hooks

Use Trigger to manage a "Recycle Bin" for deleted items

CREATE TRIGGER BooksDeleteTrigger ON MyBooksDB.Books AFTER DELETE AS INSERT INTO BooksRecycleBin SELECT * FROM deleted; GO

SQL • Triggers

Link CoreLocation Framework

Import the CoreLocation module in your classes that use CoreLocation functionality. //Swift import CoreLocation //Objective-C #import <CoreLocation/CoreLocation.h>

iOS • Core Location

Request Permission to Use Location Services

Check the app's authorization status with: //Swift let status: CLAuthorizationStatus = CLLocationManager.authorizationStatus() //Objective-C CLAuthorizationStatus status = [CLLocationManager authorizationStatus]; Test the status against the follow constants: //Swift switch status { case ...

iOS • Core Location

How to define a test operation for a system

(in-package #:asdf-user) (defsystem #:foo :components ((:file "foo")) :in-order-to ((asdf:test-op (asdf:load-op :foo))) :perform (asdf:test-op (o c) (uiop:symbol-call :foo-tests 'run-tests))) (defsystem #:foo-tests :name "foo-test" :compo...

common-lisp • ASDF - Another System Definition Facility

Stringer

The fmt.Stringer interface requires a single method, String() string to be satisfied. The string method defines the "native" string format for that value, and is the default representation if the value is provided to any of the fmt packages formatting or printing routines. package main ...

Go • Fmt

Installation or Setup

Notepad++ can be installed: From the installer downloaded from the project's web site From Ninite, which would download and automatically install the latest version available: https://ninite.com/notepadplusplus/ Built from sources who are available in the GitHub Repo of this project.

notepad++ • Getting started with notepad++

Copy to clipboard from textarea using execCommand("copy")

Example: <!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title></title> </head> <body> <textarea id="content"></textarea> <input type="button" id="copy...

JavaScript • execCommand and contenteditable

Character class and common problems faced by beginner

1. Character Class Character class is denoted by []. Content inside a character class is treated as single character separately. e.g. suppose we use [12345] In the example above, it means match 1 or 2 or 3 or 4 or 5 . In simple words, it can be understood as or condition for single characters (...

Regular Expressions • Character classes

Moving scroll when UITextView becomes first responder

Observe the notifications UIKeyboardWillShowNotification and UIKeyboardWillHideNotification, update the scrollView content insets according to keyboard height, then scroll to the focused control. - (void)viewDidLoad { [super viewDidLoad]; // register for keyboard notifications [[...

iOS • UITextField

Submitting Ajax form

View file: <?php use yii; use yii\bootstrap\ActiveForm; use yii\helpers\Html; ?> <?php $form = ActiveForm::begin([ 'action' => ['comments/ajax-comment'], 'options' => [ 'class' => 'comment-form' ] ]); ?> <?= $form->field($model, '...

yii2 • Ajax Request

Reading a cookie

In order to read a cookie use the following code: $value = \Yii::$app->getRequest()->getCookies()->getValue('my_cookie'); Note: this code allows read cookies that has been set using cookie component (because it signs all cookies by default). Therefore if you add/update cookie using JS c...

yii2 • Cookies

Cookies for subdomains

Because of security reasons, by default cookies are accessible only on the same domain from which they were set. For example, if you have set a cookie on domain example.com, you cannot get it on domain www.example.com. So if you're planning to use subdomains (i.e. admin.example.com, profile.exampl...

yii2 • Cookies

Cross-subdomain authentication and identity cookies

In case of autologin or "remember me" cookie, the same quirks as in case of subdomain cookies are applying. But this time you need to configure user component, setting identityCookie array to desired cookie config. Open you application config file and add identityCookie parameters to use...

yii2 • Cookies

Session cookie parameters

Session cookies parameters are important both if you have a need to maintain session while getting from one subdomain to another or when, in contrary, you host backend app under /admin URL and want handle session separately. $config = [ // ... 'components' => [ // ... ...

yii2 • Cookies

Changing CSS with JavaScript

Pure JavaScript It's possible to add, remove or change CSS property values with JavaScript through an element's style property. var el = document.getElementById("element"); el.style.opacity = 0.5; el.style.fontFamily = 'sans-serif'; Note that style properties are named in lower came...

CSS • Getting started with CSS

Unwrap async values with async pipe

import { Component } from '@angular/core'; import { Observable } from 'rxjs/Observable'; import 'rxjs/add/observable/of'; @Component({ selector: 'async-stuff', template: ` <h1>Hello, {{ name | async }}</h1> Your Friends are: <ul> <li *ngFor=&quot...

Angular 2 • Pipes

Installation or Setup

Detailed instructions on getting oauth set up or installed.

oauth • Getting started with oauth

Injecting a dependency into a Controller Action

A less known builtin feature is Controller Action injection using the FromServicesAttribute. [HttpGet] public async Task<IActionResult> GetAllAsync([FromServices]IProductService products) { return Ok(await products.GetAllAsync()); } An important note is that the [FromServices] c...

asp.net-core • Dependency Injection

*ngFor

form1.component.ts: import { Component } from '@angular/core'; // Defines example component and associated template @Component({ selector: 'example', template: ` <div *ngFor="let f of fruit"> {{f}} </div> <select required> <option ...

Angular 2 • Directives