B4J Tutorials

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...

 

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

The server...

 

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...

 

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...

 

How do I install the jexcell bookstore?
In fact I can not find it on the site.

 

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...

 

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...

 

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...

 

Edit: See this page for more information about B4J: https://www.b4x.com/b4j.html

 

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...

 

The computer chooses a number and you need to find the correct number.

Sub Process_Globals
   Private fx As JFX...

 

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...

 

v10.5 - March 11, 2026 - https://www.b4x.com/android/forum/t...ed-code-bundle-tool-has-been-released.170564/

• CodeBundle AI tool.
• Autocomplete in...

 

This is an old and irrelevant tutorial.

 

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...

 

The following module attributes are supported:

Main Module

• MainFormWidth / MainFormHeight - Set the main form initial width and height.
• AdditionalJar - An...

 

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

The main code is:

Sub iv_MouseMoved...

 

You can create an RDC client with B4J in the same way as done with B4A: Remote Database Connector - Connect to any remote DB...

 

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

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