Herc herkulano

Comprehensive Introduction to @ngrx/store

Also check out my lesson @ngrx/store in 10 minutes on egghead.io!

Update: Non-middleware examples have been updated to ngrx/store v2. More coming soon!

Table of Contents

Hexadecimal color code for transparency

How to set transparency with hex value ?

For example, you want to set 40% alpha transparence to #000000 (black color), you need to add 66 like this #66000000.

Download This sample on Google Play Store

What forces layout / reflow

All of the below properties or methods, when requested/called in JavaScript, will trigger the browser to synchronously calculate the style and layout*. This is also called reflow or layout thrashing, and is common performance bottleneck.

Generally, all APIs that synchronously provide layout metrics will trigger forced reflow / layout. Read on for additional cases and details.

Element APIs

Getting box metrics

elem.offsetLeft, elem.offsetTop, elem.offsetWidth, elem.offsetHeight, elem.offsetParent

Angular2 + JSPM cheat sheet

First time setup

install jspm beta: npm install -g jspm@beta
set up your project: jspm init
install dependencies: jspm install angular2 reflect-metadata zone.js es6-shim

This will create a jspm_packages folder, and a config.js file.

Open the config.js file - this file manages options for the System.js loader - tweak it as appropriate

	/**
	* Calculate the contrast of a color to determine the appropriate opposing text color.
	* @author D. Condrey
	* @param {string\|object} - element background-color or element
	* @return {string}
	* white - if background is a dark shade color
	* black - if background is a light shade color
	*/
	define(function() {

	ssh-keygen -t rsa -b 4096 -m PEM -f jwtRS256.key
	# Don't add passphrase
	openssl rsa -in jwtRS256.key -pubout -outform PEM -out jwtRS256.key.pub
	cat jwtRS256.key
	cat jwtRS256.key.pub

	<!DOCTYPE html>
	<html>
	<head>
	<style>
	body.loading #splash {
	opacity: 1;
	}
	#splash {
	position: absolute;
	top: 0;

	<!DOCTYPE html>
	<html>
	<head>
	<title>Simple tables in D3</title>
	<meta charset="utf-8">
	<script src="http://d3js.org/d3.v3.min.js"></script>
	<script src="https://rawgit.com/gka/d3-jetpack/master/d3-jetpack.js"></script>
	<style type="text/css">
	body { font-family: 'Helvetica Neue', Helvetica; font-weight: 300; padding: 20px;}
	th { text-align: left; }

	/* bling.js */
	window.$ = document.querySelector.bind(document);
	window.$$ = document.querySelectorAll.bind(document);
	Node.prototype.on = window.on = function(name, fn) { this.addEventListener(name, fn); };
	NodeList.prototype.__proto__ = Array.prototype;
	NodeList.prototype.on = function(name, fn) { this.forEach((elem) => elem.on(name, fn)); };