VBScript Procedures
VBScript has two kinds procedures:
- Sub procedure
- Function procedure
VBScript Sub Procedures
A Sub procedure:
- is a series of statements, enclosed by the Sub and End Sub statements
- can perform actions, but does not return a value
- can take arguments
- without arguments, it must include an empty set of parentheses ()
Sub mysub()
some statements
End Sub |
or
Sub mysub(argument1,argument2)
some statements
End Sub |
VBScript Function Procedures
A Function procedure:
- is a series of statements, enclosed by the Function and End Function statements
- can perform actions and can return a value
- can take arguments that are passed to it by a calling procedure
- without arguments, must include an empty set of parentheses ()
- returns a value by assigning a value to its name
Function myfunction()
some statements
myfunction=some value
End Function |
or
Function myfunction(argument1,argument2)
some statements
myfunction=some value
End Function |
Example (IE Only)
function myfunction()
myfunction=Date()
end function |
Try it yourself »
|
How to Call a Procedure
There are different ways to call a procedure. You can call it from within
another procedure, on an event, or call it within a script.
Example (IE Only)
Call a procedure when the user clicks on a button:
<body>
<button onclick="myfunction()">Click me</button>
</body> |
Try it yourself »
|
Procedures can be used to get a variable value:
Here you call a Function called "findname", the Function returns a
value that will be stored in the variable "carname".
Function procedures can calculate the sum of two arguments:
Example (IE Only)
Function myfunction(a,b)
myfunction=a+b
End Function
document.write(myfunction(5,9)) |
Try it yourself »
|
The function "myfunction" will return the sum of argument "a" and argument
"b". In this case 14.
When you call a procedure you can use the Call statement, like this:
Or, you can omit the Call statement, like this:
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