MACROMEDIA DIRECTOR MX 2004, Reference

Page: 28 / 1130

28 Chapter 2: Director Scripting Essentials
The
not
(Lingo) or ! (JavaScript syntax) operator is useful for toggling a
TRUE
or
FALSE
value to
its opposite. For example, the following statement turns on the sound if it’s currently off and
turns off the sound if it’s currently on:
-- Lingo syntax
_sound.soundEnabled = not (_sound.soundEnabled)
// JavaScript syntax
_sound.soundEnabled = !(_sound.soundEnabled);
String operators
String operators combine and define strings.
Use care when using logical operators and string operators in Lingo and JavaScript syntax. For
example, in JavaScript syntax
&&
is a logical operator that determines whether two expressions are
true, but in Lingo,
&&
is a string operator that concatenates two strings and inserts a space
between the two expressions.
Conditional constructs
By default, Director always executes script statements starting with the first statement and
continuing in order until it reaches the final statement or a statement that instructs a script to go
somewhere else.
The order in which statements are executed affects the order in which you should place
statements. For example, if you write a statement that requires some calculated value, you need to
put the statement that calculates the value first.
The first statement in the following example adds two numbers, and the second statement assigns
a string representation of the sum to a field cast member named
Answer
, which appears on the
Stage. The second statement could not be placed before the first statement because the variable
x
has not yet been defined.
-- Lingo syntax
x = 2 + 2
member("Answer").text = string(x)
// JavaScript syntax
var x = 2 + 2;
member("Answer").text = x.toString();
Operator Effect Precedence
& (Lingo only) Concatenates two strings 2
+ (JavaScript syntax only) Concatenates two string values and returns a
third string that is the union of the two operands 2
+= (JavaScript syntax only) Concatenates one string variable and one
string value, and assigns the returned value to the string variable 2
&& (Lingo only) Concatenates two strings and inserts a space between
the two 2
" Marks the beginning or end of a string. 1