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All, Development, Systems. for analysing your site speed and performance as a Frontend Developer!

Posted on 16 October 2014 | Development by Raymon Schouwenaar

For a while i was searching for a good tool to analyse my work of HTML, CSS & JavaScript. I just wanted to know what i could do better to make the websites/web-app load faster in the browsers. But I never came any further than the Google PageSpeed Insights tool. That tool is really simple …

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Bash ShellShock

Posted on 30 September 2014 | Systems by Daniel Schutterop

OK. It’s been all over the news, we all know about the bash ‘ShellShock’ exploit. The numerous proofs-of-concept and articles regarding this bug (mostly coming from companies trying to profile themselves by screaming loudest) have risen to the surface in the aftermath of the cherry bomb that was launched into the relatively quiet pond. In …

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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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What is using your shared memory?

Posted on 31 August 2014 | Systems by Jeroen de Meijer

We have a lot of Oracle database running on our Solaris systems. And they all use shared memory. It might be interesting to know how many of that shared memory is used, and maybe also which database is using how much of the available shared memory. The first is easy, the latter a bit more …

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Dynamic loading of external Javascript

Posted on 30 August 2014 | Development by Ronald Toussaint

To be able to use KPI’s for the applications we maintain, we agreed with the SLA management team to log certain in-application events and the time they have taken. For this we use an in-house developed service running under its own domain. This service can be accessed by including a JavaScript file that is hosted …

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Posted on 29 August 2014 | Systems by Anonymous Engineer

Infiniband is a switching fabric, network topology using switches, used in HPC environments. It’s features are high throughput, quality of service and low latency. It can be used for fast access to storage or between compute nodes in a cluster for instance. Mellanox is the main brand and has hardly any competition, but Intel is …

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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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