B4J Tutorials

Charts Framework

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[WebApp] Concurrent access to SQLite databases

SQLite databases are very easy to use as they don't require any additional software or configuration.

SQLite support for concurrent access is not comparable to server based databases such as...
 
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[Server] Guess My Number example

The purpose of this example is to demonstrate how you can interact with the server through ajax requests.



The server...
 

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Working with files

The File methods in B4J are identical to B4A File methods.

Text file methods

File.WriteString - Writes the given text to a new file.
File.ReadString - Reads a file and...
 
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Using Sliders

This is a simple example that shows :
Using sliders
Re-sizing windows
Changing background colour of a window
Truncating/Expanding text
Moving labels to keep pace with a slider button
Text with...
 

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  • SlidersAndText.zip
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jexcell and other librairies

How do I install the jexcell bookstore?
In fact I can not find it on the site.
 
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[WebApp] Example Task Manager using WebSockets & SQLite

This example is a simple Task Manager using HTML to access the server by the Client.
The tasks are stored in a SQLite database, which is managed by the B4J WebServer.
Read...
 
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[WebApp] (mini) Template Engine

WebUtils.ReplaceMap together with the CreateMap keyword are useful for building dynamic strings, especially for html output.

For example, in the chat example when a user writes a message we...
 
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[Server] Performance measures

B4J server library is based on an open source project named Jetty.
Jetty server performance is excellent which means that B4J server performance is also excellent.

The following numbers are the...
 
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What is B4J?

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[WebApp] Custom Elements - DatePicker & Dialogs

The web app framework can be easily extended with new elements and new features.

In this example we use two elements from jQuery UI library...
 

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  • DatePicker.zip
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GuessMyNumber - Very simple example



The computer chooses a number and you need to find the correct number.
B4X: 
Sub Process_Globals
   Private fx As JFX...
 

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  • GuessMyNumber.zip
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String to variable - Iterate variable names

This is a simple idea to replace the function "eval" or "execute" that other programming languages have. The purpose is to retrieve a variable from a string:

How to iterate variable...
 
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B4J Change Log (version history)

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Working with JavaFX Scene Builder

This is an old and irrelevant tutorial.
 
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Parsing huge text files

The JVM (Java Virtual Machine) performance is quite amazing.

This means that we can use B4J to build apps that handle huge files.
I downloaded a 3.7GB log file from this server. Each line...
 
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Modules Attributes

The following module attributes are supported:

Main Module
  • MainFormWidth / MainFormHeight - Set the main form initial width and height.
  • AdditionalJar - An...
 
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Magnifying glass example



A Canvas node is used to magnify a small window under the mouse cursor.

The main code is:
B4X: 
Sub iv_MouseMoved...
 

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  • MagnifyingGlass.zip
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RDC client

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  • RDC-Client.zip
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Moving Smiley Example



This example uses a Canvas node together with a Timer to draw a moving smiley.

The Canvas node is a special node the you...
 

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  • Smiley.zip
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