Category: HTML5

MicroAccounting Web App

This semester at the university I attended a course of web programming, and as part of the final exam I was asked to develop a web application. It would use a Java servlet hosted by the Google App Engine, and would store data to the Google’s Datastore.

I thought that it would be much more useful to make a mobile web app, which is something slightly more challenging which I didn’t practice a lot in the past.

The app goal is to track daily expenses, by providing a way to insert, edit and delete transactions.

Of course the whole project was basically boring (which is different than easy), so I decided to add a funny functionality: I included a QR code scanner to add transactions by automatically, simply scanning the related QR code.

In the end, it has been fun, and as usual I’m writing this blog post to keep track of my works.

A live version of the app is hosted by Google here.

A simple test Microaccounting Store which provides QR codes to test the app is here.

HTML5 Android apps

Some days ago me and a classmate of mine (Marco Virgolin), due to a lack of serious things to do, developed a simple quiz game as a web app, then we included it in an android app using WebView.

I write this post just to keep track of the projects I’ve been doing.

Here’s the links for the Android apps (yes, we cloned the first and made a second one):

 

The original: https://play.google.com/store/apps/details?id=com.quizdurello.quixxx

and the clone: https://play.google.com/store/apps/details?id=com.quizes.quizdogs

The Web Browser Rain

I recently discovered the library Physics.js, which is a physic engine written in Javascript for the web. It’s very interesting, so I decided to make a little project to understand how it works. On its website there are some tutorial, it’s pretty easy to get started following the instructions on that website.

After some fun coding, here‘s my result, made using the CUE framework I’ve recently written about.

CUE Framework

Today I write about another project I’ve been developing in these days.

It is the natural evolution of one of my last projects, which took me to think about a more general framework to make simple HTML 5 based websites, which look a lot like presentations, but with some enhanced components and interactive capabilities.

I named it CUE, and it’s declarative. I thought that a very tight framework like this could be the right thing to make declarative, given his simplicity and relatively few components. So you could write a simple website with this framework just by editing one html file, without needing any scripting (if you don’t need any additional components).

If you want to take a look and have a little introduction to it, visit the CUE presentation website, made of course with CUE.

Now let’s get more technical.

First of all, the framework is strongly based on jQuery, so you’ll need to include it for getting it to work. Then you can just include the CUE script file, which is quite straightforward:

<script src="http://www.nicassio.it/daniele/cue/cue.js"></script>

Then, writing the pages is quite easy too.

If you have already visited the presentation website, you should now understand what Screens and Pages are. Now that you now this, we will learn how to create some sample screens and pages, to make a little presentation website, with a bgImage and a bgGradient, with the music player and the sitemap component.

Actually, it’s really easy, and this is what your HTML should look like:

<html>
  <head>
    <title>Your title</title>
  </head>
  <body>
  <script src="your_jquery_include.js"></script>
  <cue>
      <player song="your_song.ogg"></player>
      <sitemap></sitemap>
      <page>
        <screen>
          <bgImage src="your_image.jpg"></bgImage>
          <bgCaption>First screen caption</bgCaption>
          <content>
            This is my content, here I can place any <span class="banana">HTML code</span>.
          <span trigger="nextScreen">This is a trigger</span>
          </content>
        </screen>
        <screen>
          <bgGradient type="top" color1="red" color2="black"></bgGradient>
          <bgCaption>Second screen caption</bgCaption>
          <content>
            This is the second page.
          </content>
        </screen>
      </page>
      <page>
        <screen>
          <bgImage src="your_image.jpg"></bgImage>
          <bgCaption>First screen caption</bgCaption>
          <content>
            This is the third page.
            <span trigger="nextScreen">This is a trigger</span>
          </content>
        </screen>
        <screen>
          <bgGradient type="top" color1="red" color2="black"></bgGradient>
          <bgCaption>Second screen caption</bgCaption>
          <content>
            This is the fourth page.
          </content>
        </screen>
      </page>
    </cue>
    <script src="http://www.nicassio.it/daniele/cue/cue.js"></script>
  </body>
</html>

Styling

Now, you should worry about the styling. Of course, to be customizable, you can style all your content with usual CSS. Anyway, you should know that there are other components which can be styled in the usual way: bgCaption can be provided with a class=”” parameter which will be used as a class by the framework. The same works with player and bgImage, if you need some extra styling there.

Fonts

In general, fonts can be styled with usual CSS too. But since nowadays the screen size is very variable, I introduced a class which manages the font dimension and keeps it dinamically sized relatively to the screen size.

Therefore, if you use a relative font size unit like % or em, the font size will be automatically adjusted by the framework, which modifies the body style so that every child which uses relative fonts will be modified too.

Triggers

The last thing to talk about is triggers. As you read in the presentation, a click in the first screen by default triggers the next page, not the next screen. You will need a way to set a trigger. As you see in the code above, a trigger is set simply by adding the trigger=”” parameter in an element of the content.

The triggers avaiable for use are so far:

  • nextScreen
  • nextPage
  • play
  • showPlayer

If you want to use multiple triggers for an element, do it the HTML way:

<span trigger="play showPlayer">trigger</span>

And that’s it.

I’ve developed this framework for fun, and it may be buggy. I will probably keep updating it for a while, but I can’t promise I will update this post too.

An engaging design with HTML5

This little project consists in an HTML5 page/script to make “rich presentations”. The idea is to create a design which easily takes advantage of what HTML5 offers.

In this example I decided to implement a slideshow of photos enhanced with background music, which helps creating a very pleasing experience for the user. You could fully control the user experience also by setting timers to trigger the pages, or preventing people to skip pages by clicking, and so on. Unfortunately, the code is still very messed up, but I’m planning to organize it better and maybe share it in the future updating this post.

The project was created to experience some of the power of HTML5, which includes the audio tag and the fullscreen option (which I get with this jQuery plugin).

I didn’t try (I run linux on my PCs) but I wouldn’t be surprised in discovering that IE cannot execute the page correctly. It was tested on Firefox and Chromium, having a little better performances achieved by Firefox.

Here’s the link to the example, which uses photos taken by a friend of mine, Stefano Collovati, who I want to publicly thanks here for his help in designing the prototype.

All the photos are property of Stefano Collovati, you should contact him if you want further information about using and/or sharing them.