Anselm Hannemann anselmh

Upgrade Postgresql from 9.2 to 9.6 on an uberspace

Uberspace (an awesome german web hoster) has superb postgresql support, except that it currently only offers postgresql versions 9.2.x and 9.3.x. I run postgresql 9.6.2 on my uberspace and documented steps for a migration to postgresql 9.6 here.

My goal was to be as close to the original uberspace-postgresql-setup as possible, but I had to copy and modify some uberspace scripts so they correctly use the new postgresql version.

Warning: Here be dragons. This is what I did -- that doesn't mean you should do the same or what I did was clever. Always backup your data and maybe test on a throw-away uberspace first. If you find things to improve, let me know and I'll try to keep this updated.

What I assume you have

My reply to https://helloanselm.com/2016/open-service-worker-questions/, which sets a new record for false statements per word.

The first thing I noticed after making sure that Service Worker are enabled (Chrome is behind flags)

No they're not. They've been in stable for over a year now.

was that I found no user setting or any hint in the developer tools about service workers

There's a service worker panel in the sources tab and in the resources tab. There's also chrome://serviceworker-internals/. The script also appears in the context dropdown (as iframes do). The script itself also appears in the sources panel. You can also type navigator.serviceWorker.controller into the console to inspect the controlling service worker for the page.

Conference User Stories

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As an Organizer

As an organiser I want to create an event where everyone feels safe and welcome.
As an organiser I want attendees to show a level of personal responsibility. That means ensuring that they arrive in time for all sessions, don't consume food or drink that they know will have adverse personal results and respect the speakers by listening to them and not being heads down on their laptops.
As a conference treasurer I want a ticketing system that pays straight away (like tito and not like eventbrite) so I have nice cash-flow management.

Conference User Stories

I want to gather user stories useful for running a conference (see linked blog post for more context).

Would you like to contribute? Please add a comment. This list is in no way exhaustive!

No guarantee that they'll be used, but all input is appreciated!

A common "template" is As a X, I want Y, so that Z, but use whatever feels most appropriate.

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

Answering the Front-end developer JavaScript interview questions to the best of my ability.

Explain event delegation

Sometimes you need to delegate events to things.

Explain how this works in JavaScript

This references the object or "thing" defined elsewhere. It's like "hey, thing I defined elsewhere, I'm talkin' to you."

Explain how prototypal inheritance works.

This let's me git clone a template repo, cd into and fire up a new template in my editor of choice:

$ clone starter # clones https://github.com/addyosmani/starter (a personal boilerplate)

$ clone h5bp html5-boilerplate # get me HTML5 Boilerplate

$ clone angular angular-seed # same for AngularJS seed

$ clone polymerlabs seed-element # same for a new Polymer element

	/**
	* Inspired by ebidel@ (https://gist.github.com/ebidel/1b418134837a7dde7d76ed36288c1d16)
	* @author surma@
	* License Apache-2.0
	*/

	function* collectAllElementsDeep(selector = '*', root = document.all) {
	for (const el of root) {
	if (!el.matches(selector))
	continue;

	[{"key":"320 x 480","name":"iPhone 3/4/S","width":320,"height":480},
	{"key":"320 x 568","name":"iPhone 5/C","width":320,"height":568},
	{"key":"375 x 667","name":"iPhone 6/S","width":375,"height":667},
	{"key":"414 x 736","name":"iPhone 6/S Plus","width":414,"height":736},
	{"key":"768 x 1024","name":"iPad1/2/3/4/Air","width":768,"height":1024},
	{"key":"1024 x 1366","name":"iPad Pro","width":1024,"height":1366},
	{"key":"320 x 533","name":"Samsung S/S2/S3mini","width":320,"height":533},
	{"key":"360 x 640","name":"Samsung S3/S4/S5/Note2/3/4","width":360,"height":640},
	{"key":"400 x 640","name":"Samsung Note","width":400,"height":640},
	{"key":"800 x 1280","name":"Samsung Galaxy Tab 8.9/10","width":800,"height":1280},