MACROMEDIA FLASH 8-LEARNING ACTIONSCRIPT 2.0 IN FLASH, Manual

Page: 195 / 830

About operators 195
Using logical operators
You often use logical operators with comparison operators to determine the condition of an
if
statement. This is demonstrated by the next example.
To use logical operators in your code:
1. Select File > New and create a new Flash document.
2.
Open the Actions panel and type the following ActionScript on Frame 1 of the Timeline:
this.createTextField("myTxt", 20, 0, 0, 100, 20);
myTxt.type = "input";
myTxt.border = true;
myTxt.restrict = "0-9";
this.createEmptyMovieClip("submit_mc", 30);
submit_mc.beginFill(0xFF0000);
submit_mc.moveTo(0, 0);
submit_mc.lineTo(100, 0);
submit_mc.lineTo(100, 20);
submit_mc.lineTo(0, 20);
submit_mc.lineTo(0, 0);
submit_mc.endFill();
submit_mc._x = 110;
submit_mc.onRelease = function():Void {
var myNum:Number = Number(myTxt.text);
if (isNaN(myNum)) {
trace("Please enter a number");
return;
}
if ((myNum > 10) && (myNum < 20)) {
trace("Your number is between 10 and 20");
} else {
trace("Your number is NOT between 10 and 20");
}
};
In this ActionScript, you create a text field at runtime. If you type a number into the text
field and click the button on the Stage, Flash uses the logical operator to display a message
in the Output panel. The message depends on the value of the number you type into the
text field.