How to create a QR code reader in a HTML5 website? [closed] - javascript

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I was looking for possibility to create QR code reader in my HTML5 based web page. I've done some googling and all the links point me to the mobile applications.
Please help me with some pointers as to how I can use HTML5 and JavaScript to read a QR code containing a url and then redirect the browser to that URL.

There aren't many JavaScript decoders.
There is one at http://www.webqr.com/index.html
The easiest way is to run ZXing or similar on your server. You can then POST the image and get the decoded result back in the response.

The jsqrcode library by Lazarsoft is now working perfectly using just HTML5, i.e. getUserMedia (WebRTC). You can find it on GitHub.
I also found a great fork which is much simplified. Just one file (plus jQuery) and one call of a method: see html5-qrcode on GitHub.

Reader they show at http://www.webqr.com/index.html works like a charm, but literaly, you need the one on the webpage, the github version it's really hard to make it work, however, it is possible. The best way to go is reverse-engineer the example shown at the webpage.
However, to edit and get the full potential out of it, it's not so easy. At some point I may post the stripped-down reverse-engineered QR reader, but in the meantime have some fun hacking the code.
Happy coding.

The algorithm that drives http://www.webqr.com is a JavaScript implementation of https://github.com/LazarSoft/jsqrcode. I haven't tried how reliable it is yet, but that's certainly the easier plug-and-play solution (client- or server-side) out of the two.

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Code colors in Html using CSS or javascript [closed]

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I have a website and I teach Java on it.
I know html and css if it helps..
I have lectures in my site and in my lectures there are descriptions: in the description I write code sometimes so I made a class for code so everytime I type code I do and it looks good, but not perfect.
I want to make specific words to be bold and in blue or pink color for example.
Is there a way to do it? maybe with javascript?
I know I can create a new class for special words and then to do for example but this will be too much job to write this span every time that it's not worth it.
So is there a way to do it maybe with html5 or js? Thank you.
edit: I use the usefedora.com platform so it's more difficult to do it, does somebody knows how to do it on usefedora's platform?
the thing you are searching for is a codemirror. There are many codemirrors but only one of them is called codemirror.
Code Mirror
There are also solutions that don't require you to write any javascript, using web components.
Prism.js
Here is one that's insanely trivial to use
There are plenty of code to html converters which do syntax highlighting if that's what your looking for e.g.
http://tohtml.com/java/
or
http://hilite.me/
You can take this HTML and use it on your site.
You can also download a jQuery plugin. SyntaxHighlighter is very popular.
The way they work is that you copy the files to your website, and then you just put your code into a tag, and the plugin automatically beautifies your code.
I would recommend choosing one of these libraries- PrismJS, Highlight.js, or Rainbow.
Each is designed for exactly this purpose. You just put your code into the web page, inside an HTML5 code tag decorated with the language name. They will automatically format your code with the necessary markup to attach color styles to. No need for any external tools. The first two provide their own styles as well, the last assumes you'll write your own.

Is there a good web application for manipulating pdf files? [closed]

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Is there a good web application for manipulating a PDF files? For example, drag and drop images to it and save for future reference, then remove the dropped images anytime etc. I want to integrate it with my existing web application also.
EDIT:
These links I have came across while searching. Might be useful for someone searching the same.:)
PDFescape
Crocodoc
A.nnotate.com(a.nnotate.com)
GroupDocs Annotation(groupdocs.com/apps/annotation)
Mozilla has pdf.js which renders PDF files using HTML5. This same script is used in the built-in PDF reader of recent Firefox browsers.
It's experimental, but you could hack the code and do whatever you want with it.
If you are looking for just an online tool which will spit the pdf file use - Sejda
there is a lot of other tools available online too
PDF Sharp will allow you to do all sort of manipulation that you require. It is open source, free to use. You can download it from here..
Features include
Creates PDF documents on the fly from any .Net language
Easy to understand object model to compose documents
One source code for drawing on a PDF page as well as in a window or on the printer
Modify, merge, and split existing PDF files
Images with transparency (color mask, monochrome mask, alpha mask)
Newly designed from scratch and written entirely in C#
The graphical classes go well with .Net

JavaScripted Augmented Reality [closed]

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Does anyone have experience with a JavaScript library for Augmented Reality?
If so, can you recommend one?
EDIT:
Not sure how to better clarify this... By Augmented Reality I mean using device webcam (laptop, smartphone, tablet) and overlapping elements over the video feed on screen. Ofen, the overlapping is done based on a marker the algorithm searches for within each frame and makes calculations about its position in space.
Hope that's enough.
Thanks.
I think this is what you might be looking for. JSARToolkit is a direct port of Flash FLARToolkit from Ilmari Heikkinen. Great tutorial you may also want to check out and a link to the Git repo.
http://weblog.bocoup.com/javascript-augmented-reality/
https://github.com/kig/JSARToolKit
You can try skarf.js, a framework that I have created for handling JavaScript augmented reality libraries in Three.js.
It currently integrates JSARToolKit and js-aruco, so you can easily switch between these two libraries to decide on the more suitable one to use.
This framework takes care of a number of things for you, including automatic loading of models when the associated markers are detected (association is specified in a JSON file). There is also a GUI marker system which allows users to control settings using AR markers.
Integration with Three.js is just one line of code to create a Skarf instance and another line of code to update.
There are videos, live demos, source codes, examples and documentation available. Check out http://cg.skeelogy.com/skarfjs/ for more info.

How can I make an online Book like http://www.20thingsilearned.com/ [closed]

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Recently, I have found this site made by Google Team.
http://www.20thingsilearned.com/
So far I understand this is not based on Flash. How can I use this technology to make an online book using their technology?
I looked in the usual spots to see if there's a framework or something but I only found these two things (it looks like it would be a TON of work to use):
news.ycombinator.com/item?id=1918551 >>> gist.github.com/705761
Alternatively you might want to look into the slides at http://slides.html5rocks.com.
They have a Google Code project page at code.google.com/p/html5rocks/wiki/Slides where you can download the source for that.
EDIT
check this out!
http://bartaz.github.com/impress.js
and this!
http://lab.hakim.se/reveal-js/
This is HTML5. You can check the explanation here: http://www.html5rocks.com/tutorials/casestudies/20things_pageflip.html :)
Or if you want you can do it with jQuery Booklet too though not as smooth as HTML5, see here: http://tympanus.net/Tutorials/MoleskineNotebook/
They posted the source code for the whole app (running on Google App Engine) under GPL v2 at http://code.google.com/p/20thingsilearned/ so you can reproduce the whole book effect too.
Yes this is not flash for sure but flash or flexx can also be used for developing this. This is developed using HMTL 5 and javascript. HTML 5 is having a canvas object and the i believe it is using properties of canvas to bulid it. However if you will search for some jQuery book plugins then also you may get some similiar results.

creating something like pageflakes [closed]

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Does anyone know about a tutorial that lets you to create something like pageflakes.com for your website? In jquery perhaps?
The creator of PageFlakes, Omar al Zabir, has created an open-source web portal called DropThings. Can't get any more similiar to PageFlakes than that!
You can use the UI library from jQuery where you'll find the draggable elements with grid. Besides that you only need to set and read some cookies that determine the position of each of the boxes.
Let's say your layout has 4 <div>s. Just save each id and position in a cookie (from javascript or by performing an AJAX request to a php/asp page).
Displaying the page is also pretty easy, you have to have 2 possibilities: when the user has a cookie defined, or else (this would be the default). If the user has a cookie defined, read it and position the <div>s like the cookie says, it shouldn't be too hard to do this.
This article on CodeProject has an excellent tutorial on how to build almost exactly what you're after, except that it uses ASP.Net Ajax. You would easily be able to substitute that with jQuery though.
.nettuts has an example all done in jquery and jquery ui. Here's the link:
http://net.tutsplus.com/tutorials/javascript-ajax/inettuts/
Goes through it all in very nice detail too. It won't be a direct copy of pageflakes, that's an exercise left for the reader but it does show exactly how to start.
HTH!
Check out ExtJS's Panels. They're what's used to build this pageflakes look-alike:
http://extjs.com/deploy/dev/examples/portal/portal.html

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