professional-javascript-04-xbObjectsExample2.htm / htm
<html>
<head>
<title>Example</title>
<script type="text/javascript" src="xbObjects.js"></script>
</head>
<body>
<script type="text/javascript">
_classes.registerClass("Polygon");
function Polygon(iSides) {
_classes.defineClass("Polygon", prototypeFunction);
this.init(iSides);
function prototypeFunction() {
Polygon.prototype.init = function(iSides) {
this.parentMethod("init");
this.sides = iSides;
};
Polygon.prototype.getArea = function () {
return 0;
};
}
}
_classes.registerClass("Triangle", "Polygon");
function Triangle(iBase, iHeight) {
_classes.defineClass("Triangle", prototypeFunction);
this.init(iBase,iHeight);
function prototypeFunction() {
Triangle.prototype.init = function(iBase, iHeight) {
this.parentMethod("init", 3);
this.base = iBase;
this.height = iHeight;
};
Triangle.prototype.getArea = function () {
return 0.5 * this.base * this.height;
};
}
}
_classes.registerClass("Rectangle", "Polygon");
function Rectangle(iLength, iWidth) {
_classes.defineClass("Rectangle", prototypeFunction);
this.init(iLength, iWidth);
function prototypeFunction() {
Rectangle.prototype.init = function(iLength, iWidth) {
this.parentMethod("init", 4);
this.length = iLength;
this.width = iWidth;
}
Rectangle.prototype.getArea = function () {
return this.length * this.width;
};
}
}
var triangle = new Triangle(12, 4);
var rectangle = new Rectangle(22, 10);
alert(triangle.sides);
alert(triangle.getArea());
alert(rectangle.sides);
alert(rectangle.getArea());
</script>
</body>
</html>
(C) Æliens 20/2/2008
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