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Revision as of 19:40, 19 April 2012
With GeoGebra 4.2 we have introduced pure HTML5 GeoGebra documents. This way GeoGebra applets start even faster than before, and this technology provides availability of GeoGebra for smartphone users as well since Java is no longer a prerequisite. Such documents currently have only a limited set of commands (e.g. spreadsheets do not work yet), and they have no menu driven graphical user interface, but otherwise have the same features as usual GeoGebra documents. The main advantage is that GeoGebra runs on a wider set of hardware at a more comfortable speed, but to harness all the possibilities, one should always use the latest web browsers. In short, we call this technology GeoGebraWeb, and the documents created by this method are called GeoGebraWeb documents.
There are two types of GeoGebraWeb documents: online and offline. Online documents are usually hosted by the official GeoGebra servers, primarily by GeoGebra; and offline documents are usually put on intranet servers by members of the GeoGebra community, or even on the end users' own machine.
We suggest using online documents everywhere! GeoGebra automatically detects a user's web browser and decides if it is running on a smartphone, and serves the document in GeoGebraWeb format. Hence we strongly suggest to upload all your documents to GeoGebraWeb if you want to publish teaching materials. This has a great advantage: GeoGebra will always show the latest GeoGebraWeb document when a user wants to visit it on his/her smartphone. In some cases, however, GeoGebra cannot identify the end user's machine correctly: in such cases we recommend to add the &mobile=true setting to the end of the document URL.
In some situations it is useful to have offline GeoGebraWeb documents available. For example, if internet is not available during a classroom teaching, or during a travel without an internet connection good enough.
Since version 18.104.22.168, offline GeoGebraWeb documents can also be created in GeoGebra by following these steps: In File menu, go to Export -> Dynamic worksheet as webpage (html), and click the "Export as Webpage" tab, then select the "Advanced" tab and check for the following options in the "Files" settings:
- Export to HTML5 only
- Allow offline use
Then press "Export". Now GeoGebra will automatically download the required set of files and copy them into the appropriate directory. Please expect approximately 40 MB of data for an offline GeoGebraWeb document. You can simply copy all the created files for this export to another directory or another machine, and use them.
How GeoGebraWeb works
GeoGebraWeb consists of a set of HTML files which will be downloaded from the GeoGebra Developer Site by GeoGebra on a user initiated export. The files are packaged in a .zip archive, and can be downloaded manually as well. However, these files are not intended for end users. For those who are still interested in the internal details, and want to tweak the HTML files, we provide some additional information here.
An HTML document may contain several GeoGebraWeb documents, but here we assume that only one will be used. The HTML file should look something like this:
Here we omit the beginning and closing parts of a typical HTML file and focus only the GeoGebraWeb parts. First of all, the GeoGebraWeb source must be loaded. For online documents the GEOGEBRAWEB_SOURCE must be http://www.geogebra.org/web/4.2/web/web.nocache.js, for offline documents its correct setting is web/web.nocache.js. The WIDTH and HEIGHT settings should be the desired applet size in pixels. The other parameters are direct settings for GeoGebraWeb. Finally, the data-param-ggbbase64 setting must contain the .ggb file in base64 encoding. This is usually a very long, unreadable text (several thousands of characters), not for human processing. Luckily, the GeoGebra desktop application will do the base64 encoding for the .ggb file for you, but of course you can use any other software if you wish (do an Internet search for base64 encoding software).
How to obtain GeoGebraWeb
Every time you export your .ggb file to offline GeoGebraWeb format, the GeoGebra application will download the latest GeoGebraWeb .zip file into your temp directory. To do this manually, you can always download it from http://dev.geogebra.org/download/web/GeoGebraWeb-latest.zip.If you are a web developer, you can learn even more on this technology on the GeoGebra Developer Site.es:Creando Documentos HTML5 con GeoGebraWeb