U-X > while |
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while
Availability
Flash Player 4.
Usage
while(
condition
) {
statement(s)
;
}
Parameters
condition
The expression that is reevaluated each time the while
action is executed. If the statement evaluates to true
, the statement(s)
is run.
statement(s)
The code to execute if the condition evaluates to true
.
Returns
Nothing.
Description
Action; tests an expression and runs a statement or series of statements repeatedly in a loop as long as the expression is true
.
Before the statement block is run, the condition
is tested; if the test returns true
, the statement block is run. If the condition is false
, the statement block is skipped and the first statement after the while
action's statement block is executed.
Looping is commonly used to perform an action while a counter variable is less than a specified value. At the end of each loop, the counter is incremented until the specified value is reached. At that point, the condition
is no longer true
, and the loop ends.
The while
statement performs the following series of steps. Each repetition of steps 1-4 is called an iteration of the loop. The condition
is retested at the beginning of each iteration, as in the following steps:
1 |
The expression |
2 |
If |
Otherwise, the |
|
3 |
Run the statement block |
4 |
Go to step 1. |
Example
This example duplicates five movie clips on the Stage, each with a randomly generated x and y position, xscale
and yscale
, and _alpha
property to achieve a scattered effect. The variable foo
is initialized with the value 0. The condition
parameter is set so that the while
loop will run five times, or as long as the value of the variable foo
is less than 5. Inside the while
loop, a movie clip is duplicated and setProperty
is used to adjust the various properties of the duplicated movie clip. The last statement of the loop increments foo
so that when the value reaches 5, the condition
parameter evaluates to false
, and the loop will not be executed.
on(release) { foo = 0; while(foo < 5) { duplicateMovieClip("_root.flower", "mc" + foo, foo); setProperty("mc" + foo, _x, random(275)); setProperty("mc" + foo, _y, random(275)); setProperty("mc" + foo, _alpha, random(275)); setProperty("mc" + foo, _xscale, random(200)); setProperty("mc" + foo, _yscale, random(200)); foo++; } }
See also
do while
, continue
, for
, for..in
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