gwagner's blog

Dropping a DOM node without consulting its parent

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For quite a long time, it was pretty cumbersome to delete a node from the DOM of an HTML document because one had to go to its parent and ask it to destroy its child (by invoking removeChild), like so:

var elemToDrop = document.getElementById("elemID");
elemToDrop.parentNode.removeChild( elemToDrop);

It has always felt strange having to use such an indirect approach (having to ask the parent) for the very basic operation of dropping a DOM node.

CRUD Operations with IndexedDB - Part 1: Creating and Clearing a Database

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In this article, we show how to create and clear an IndexedDB database keeping all code in a single HTML file. Creating an IndexedDB database means first creating an empty database, and then adding records to its empty tables (or "object stores"). In Part 2, we will explain how to retrieve, update and delete IndexedDB records, such that we get the full collection of CRUD operations: Create, Update, Retrieve and Delete.

Drag&Drop HTML5/JS API Summary

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Test the Drag & Drop Mechanism

Representing Information Models as RDF and OWL Vocabularies

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The Resource Description Framework (RDF), together with its extension RDF Schema, is a logical formalism that allows formalizing information models in the form of RDF vocabularies and representing propositional information on the Web, embedded in web pages or in the form of special web data sources. OWL extends RDF by adding many additional language elements for expressing constraints, equalities and derived classes and properties in the context of defining vocabularies. Unfortunately, both RDF and OWL have many usability issues.

What Is Reactive Programming and how Does It Work?

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The term "reactive programming" refers to a programming style based on handling "events" of all sorts. App developers are familiar with simple user interface events, such as mouse clicks, and know how to deal with them using their favorite programming language. But there are also other kinds of events an app may have to deal with, such as a state change of an object, an incoming message, the completion of an asynchronuous operation or an exception/error event.


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