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How to get numeric keyboards on all iOS and Android devices with vanilla JavaScript

Posted on 1 September 2014 | Development by Raymon Schouwenaar

If you’re working with Mobile Web Applications you might have encountered some issues with the HTML5 input types. When you only need an numeric keyboard, the logical approach would be <input type=”number”>. But on some iOS and Android devices that doesn’t work (you get a normal keyboard). But how can you fix this with Vanilla …

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Javascript fundamentals: variable scopes

Posted on 25 August 2014 | Development by Michiel van Roon

A few months ago I wrote about the concept of context and the this keyword – one of JavaScript’s core fundamentals. Today I’ll be going over another important concept in JavaScript called ‘scope’. Browsers – and other JavaScript environments like NodeJS – reserve, fill and free up computer memory when you define variables inside your …

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Create a CSS-only Responsive Image Grid (with ratio scaling)

Posted on 18 August 2014 | Development by Raymon Schouwenaar

(almost) Everywhere on the web nowadays you see Responsive Websites, but it can be challenging to get your images to scale in ratio. Here is a small demo I made of one solution. Step 1 Create an HTML list with images and an text label. I use dummy images from, it’s super handy! 1 …

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Using sendmail as a mail server

Posted on 30 July 2014 | Systems by Jeroen de Meijer

Last time I described how you can easily configure a system to send email to a central mailserver with sendmail. Using sendmail as a basic mailserver isn’t difficult either. Again, the file is not designed to be readable, but optimized for parsing. The correct (and easy) way to configure sendmail is by using macro’s. …

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Create partials in a static site with jQuery

Posted on 30 July 2014 | Development by Raymon Schouwenaar

If you’re building a static website, you know that if you change the footer or header you need to change it in every html page. Of course if you’re using some server-side language like PHP you can include partial files, but jQuery can help too. Place the code of your header in header.html (for example). …

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Configuring sendmail using macro’s

Posted on 8 July 2014 | Systems by Jeroen de Meijer

A lot of sysadmins complain that sendmail is way to difficult and that the file is unreadable. The fact is however, that the is not designed to be human readable (but optimized for parsing). The correct (and easy) way to configure sendmail is by using macro’s. You define which macro’s you want to …

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Switching files

Posted on 7 July 2014 | Systems by Daniel Schutterop

I can’t even recall how often I copy a file to and revise the original, just to copy the .org back to its original when my actions fail. Or even worse, copying the modified file to a, copying the to filename and the to Been there? Way too many actions …

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Automating tasks with Fabric

Posted on 1 July 2014 | Systems by Arjen de Vries

For a client I had to test and setup a new puppet environment. This included reinstalling and configuring the base installation multiple times. To make my life a bit easier i’ve created the fabric fabfile shown below. It’s not that fancy but can make your life a lot easier. I’ve used it on mainly Scientific …

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Debug your Responsive website remotely with Chrome

Posted on 25 June 2014 | Development by Raymon Schouwenaar

How do you test your Responsive website? Do you use the DevTools in Chrome and just resize your browser? Or do you switch between the user agents (also an option in Chrome’s DevTools)? If you use one of these options it’s nice. But! It can be a lot better to test on real devices. So …

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How to build a docker image based on debian 14.04 LTS with an Nginx webserver

Posted on 11 June 2014 | Systems by Arjen de Vries

In this short tech tutorial i’ll show you how to build a docker image based on debain 14.04 LTS with an Nginx webserver. Of course you an also use an image from the docker repositories, but where’s the fun in that First we’ll need a base image to build our docker image from. You can …

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