What is a flow-function?

A flow-function is a recognition of the fact that in programming, different structures of control flow are often strongly related to specific classes of function. For instance, the if-then-else construct (known as a conditional) is often affiliated with testing or comparing values.

In Obyx, we have tied the flow structure with the functions that commonly occur with them, by declaring the specific function that controls the flow as the 'operation' attribute of each of the language's four flow-functions.

For more detail on flow-functions, visit the flow-function documentation

Download validating User Input Tutorial (.zip file)

Validating User Input (We are working on this one - Coming soon)

This tutorial introduces User Input Validation and shows how to write reusable OBYX functions.

Following on from the Iteration tutorial, we will now learn how to overcome the run-time error previously encountered and also how to write reusable OBYX functions.

Using the rational from previous tutorials we will call the XHTML file "userinput.ixml".

The View

Use the code provided below to create your view file 

userinput.ixml:
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
<head>
	<meta http-equiv="content-type" content="text/html; charset=utf-8" />
	<title>Validating User Input</title>
</head>
<body>
<div></div>
</body>
</html>

this is text

-----------------

Summary of Validating User Input Tutorial

By the end of this tutorial you should have knowledge about the following concepts:

  • Validate User Input
  • Write reusable OBYX functions

Download Validating User Input Tutorial (.zip file)

Understanding these basic concepts are essential to OBYX programming. Spend time experimenting with each of the examples and ensure you understand why each of the elements are used.



Last Modified: Tue, 08 Jun 2010