Someday I started an application using NodeJS with ExpressJS framework and decided to use passport for authenticate the users. As many other times I wanted to use flash messages so, when user authentication fails, the application shows a message informing about bad credentials. Nothing new on the horizon until…. OMG !!! I can’t see the flash messages !!! Disclaimer: This is ...

OpenLayers3 offers the ol.source.GeoJSON class that allows to read data from a GeoJSON source (an URL, a JavaScript object or a text string). Maybe you, like me, has spent some time trying to understand why your GeoJSON data is not rendering properly: projection is fine, your GeoJSON is well formed and validated but OpenLayers3 doesn’t return any features and so ...

A heatmap is a powerful way to visualise data. Given a matrix of data each value is represented by a color. The implementation of the heatmap algorithm is expensive in computation terms: for each grid’s pixel you need to compute its colour from a set of known values. As you can thing, it is not feasible to be implement it on the ...

For my next project and, after looking for candidates and reading some hundreds of lines of documentation, I finally choose to work with the so called MEAN stack: mongodb, express, angular and node. As with any other technology ecosystem, the great number of frameworks, libraries and tools can make our choice a challenge, and JavaScript is not an exception. But for ...

This post is the continuation of the series Things I learned creating a jQuery Plugin. In the first part we have seen how the structure of a jQuery plugin must be, the plugin entry point (so called wrapper function) and how we can control the behavior of a method as a getter or setter. Define default options Your plugin more probably will accept ...

jQuery is one of the most used JavaScript libraries, if not the most used one, which allows to make great things with the big set of little tools it offers to the web developers: HTML/DOM manipulation, CSS manipulation, HTML event methods, effects and animations, AJAX, utilities, … One of the key aspects of jQuery is the possibility to extend it ...