Tutorial by Examples: r

Separate Overrides from Bug Fixes

In ExtJS, you can override nearly any method of the framework and replace it with your own. This allows you to modify existing classes without directly modifying the ExtJS source code. Sometimes, you may want to enhance an existing class or provide a sane default property on a class. For example, ...

extjs • Common Pitfalls & Best Practices

Basic webpage using bootstrap components

<!DOCTYPE html> <html lang="en"> <head> <meta charset="utf-8"> <meta http-equiv="X-UA-Compatible" content="IE=edge"> <meta name="viewport" content="width=device-width, initial-scale=1">...

twitter-bootstrap • Getting started with twitter-bootstrap

Insert data

ECMA 6: const user = new User({ name: 'Stack', password: 'Overflow', }) ; user.save((err) => { if (err) throw err; console.log('User saved!'); }); ECMA5.1: var user = new User({ name: 'Stack', password: 'Overflow', }) ; user.save(function (err) { ...

Node.js • Database (MongoDB with Mongoose)

Read data

ECMA6: User.findOne({ name: 'stack' }, (err, user) => { if (err) throw err; if (!user) { console.log('No user was found'); } else { console.log('User was found'); } }); ECMA5.1: User.findOne({ name: 'stack' }, function (err, user) { i...

Node.js • Database (MongoDB with Mongoose)

Catching and handling errors in user code

On error move to labelled code and see if there is a specific error that needs to be handled. Public Const cErrCodeNotNumber = 2262 ' This value must be a number. Public Const cErrCodeNumericOverflow = 2263 ' The number is too large. Private Sub MySub() Dim objConn As ADODB.Connection ...

access-vba • Access Error Codes (Form.Error, DataErr)

Search by filename

While in the sources tab use CTRL+O (⌘+O for Mac) to search by filename.

google-chrome-devtools • Getting started with google-chrome-devtools

Go to member (javaScript function/CSS rule)

Use CTRL+SHIFT+O (⌘+SHIFT+O for mac) to navigate to a javaScript function/CSS rule when viewing a file.

google-chrome-devtools • Getting started with google-chrome-devtools

cd command, directories explained

michael@who-cares:~$ The symbol ~ after the who-cares: is the current directory. ~ actually means the person's home directory. In this case, that's /home/michael. michael@who-cares:~$ cd Downloads michael@who-cares:~/Downloads$ Looks for Downloads in the current directory, then makes that th...

unix • Basic console commands

Integrity Validated - Symmetric Key - Encryption and Decryption example using Java

Encryption is used to transform data in its orignal format (Eg: The contents of a letter, Credentials part of authorizing a financial transaction) to something that cannot be easily reconstructed by anyone who is not intended to be part of the conversation. Basically encryption is used to preve...

cryptography • Getting started with cryptography

Ionic Platform (Ionic Cloud) for Yo (Yeoman) Ionic Projects

Ionic Platform: Build, push, deploy, and scale your Ionic apps, the easy way. Title Description: The Ionic Platform is a cloud platform for managing and scaling cross-platform mobile apps. Integrated services enable you and your team to build, deploy, and grow your apps efficiently. Docume...

ionic-framework • Getting started with ionic-framework

What is Data processing latency?

When a hit is sent to Google Analytics the data must be processed. Processing latency is 24-48 hours. This means that it can take time before you will see data under standard reports (Not real-time) any data that you do see may not be correct as it has probably not completed processing. Standard a...

google-analytics • Data processing latency

with_items - predefined list

You can also loop over a variable list. From vars: favorite_snacks: - hotdog - ice cream - chips and then the loop: - name: create directories for storing my snacks file: path=/etc/snacks/{{ item }} state=directory with_items: '{{ favorite_snacks }}' If you are using Ansible ...

ansible • Ansible: Looping

with_items - predefined dictionary

It is possible to create more complex loops with dictionaries. From vars: packages: - present: tree - present: nmap - absent: apache2 then the loop: - name: manage packages package: name={{ item.value }} state={{ item.key }} with_items: '{{ packages }}' Or, if you don't like ...

ansible • Ansible: Looping

with_items - dictionary

You can use a dictionary for a slightly more complex loop. - name: manage packages package: name={{ item.name }} state={{ item.state }} with_items: - { name: tree, state: present } - { name: nmap, state: present } - { name: apache2, state: absent }

ansible • Ansible: Looping

Decoupling ErrorHandlerAttribute registering from the service implementation

To decouple and reuse the same error logging code for all your services you need two boilerplate classes and tuck them away in a library somewhere. ErrorhandlerAttribute implementing IServiceBehavior. FaultErrorhandler implementing IErrorhandler which logs all the exceptions. [AttributeUsage(Attr...

wcf • Handling exceptions

Introduction

Instead of bloating your main js file that contains your navigator with buttons. It's cleaner to just inject buttons on-demand in any page that you need. //In the page "Home", I want to have the right nav button to show //a settings modal that resides in "Home" component. c...

react-native • Navigator with buttons injected from pages

Simple CRUD with POJOs

One of the great things about Ektorp, is that it provides ORM like functionality, straight out of the box. This example will walk you through creating a simple POJO and doing standard CRUD operation on it Creating a simple POJO First off, we define a POJO as follows import com.fasterxml.jackson...

couchdb • Ektorp java client

Getting Started with FirebaseUI

FirebaseUI offers Android, iOS, and Web clients. You can get started with them like so: Android: // app/build.gradle dependencies { // Single target that includes all FirebaseUI libraries compile 'com.firebaseui:firebase-ui:0.5.2' // FirebaseUI Database only compile 'com.f...

firebase • FirebaseUI

Replacing strings in case clauses

Let's say we have multiple data sources which include database, file, prompt and argumentList. Depending on chosen source we change our approach: def loadData(dataSource: Symbol): Try[String] = dataSource match { case 'database => loadDatabase() // Loading data from database case 'file =&g...

Scala Language • Symbol Literals

Use the AdaptiveTrigger to change the UI layout

The UWP applications can run in windowed mode and on several devices. They can be displayed on a wide range of screen sizes from low end phones to the huge surface hub screen. Using relative positioning will be enough for a lot of scenario but as the window size increases, it is always interesting t...

uwp • Adaptive UI