Standard Globals

Embedded JavaScript defines a set of global functions, constructors and variables for every JavaScript program.

JavaScript Variables

The ESP run-time defines the following JavaScript variables for use inside an ESP page.

Variable Name	Description
false	False boolean value
global	Global variables for this request
Infinity	Floating point number set to Infinity
local	Local variables for the outermost JavaScript block in the ESP web page
Nan	Floating point number set to "Not a Number"
null	Defined variable set to Null
true	True boolean value
undefined	Variable has no value and is set to the Undefined Value

JavaScript Constructors

EJS defines the following object constructors.

Script Name	Syntax	Examples	Description
Array	Array(elt1, elt2, ...) Array(size)	var o = new Array("item 1", "item 2"); var o = new Array(256);	Create an array and insert elements. The second form creates an array with elements named "0", "1", "2", and so forth up to the nominated size.
Object	Object();	var o = new Object();	Create a new object.

JavaScript Functions

EJS defines the following global functions:

Script Name	Syntax	Examples	Description
assert	assert(condition)
eval	eval(script);	eval("var " + x + " = " + string);	Evaluate the given script.
exit	exit(status)	exit(0);	Immediately terminate the current script or ESP.
include	include(filename);	include("myLib.js");	Server side inclusion of a JavaScript library. The nominated file is read and parsed inline when the page is compiled by AppWeb.
print	print(string, ...);	print("Hello World\n");	Print the given strings to the web server standard output.
println	print(string, ...);	print("Hello World");	Print the given strings to the web server standard output followed by a new line.
printVars	print(v, ...);	print(obj1, obj2, obj3);	Print the string representation of the given objects to the web server standard output. Objects are expanded and all properties are printed. Great for debugging.
refCount	refCount(o);	var count = refCount(obj);	Return the number of references to this object.
trace	trace(message); trace(level, message);	trace(2, "Message at level 2");	Write a message to the AppWeb log.