Object.getTypeName Function
Returns a string that identifies the run-time type name of an object.
var typeNameVar = Object.getTypeName(instance);
The following code example demonstrates how to use the getTypeName function to discover the name of an object's type.
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml" > <head id="Head1" runat="server"> <title>Samples</title> </head> <body> <form id="form1" runat="server"> <asp:ScriptManager runat="server" ID="ScriptManager1"> </asp:ScriptManager> <script type="text/javascript"> Type.registerNamespace('Samples'); // Define and register a Samples.Rectangle class. Samples.Rectangle = function(width, height) { this._width = width; this._height = height; } Samples.Rectangle.prototype.getWidth = function() { return (this._width === undefined) ? null : this._width; } Samples.Rectangle.prototype.getHeight = function() { return (this._width === undefined) ? null : this._height; } Samples.Rectangle.registerClass('Samples.Rectangle'); // Define and register a Samples.Square class. Samples.Square = function(length) { this._length = length; } Samples.Square.prototype.getLength = function() { return (this._length === undefined) ? null : this._length; } Samples.Square.prototype.setLength = function(length) { this._length = length; } Samples.Square.registerClass('Samples.Square'); // Create instances of Square and Rectangle and discover their types. Samples.testObjectReflection = function() { var width = 200; var height = 100; var a = new Samples.Rectangle(width, height); var length = 50; var b = new Samples.Square(length); var name = Object.getTypeName(a); // Output "The type name of object a is: Samples.Rectangle" alert("The type name of object a is: " + name); var isSquare = Samples.Rectangle.isInstanceOfType(b) // Output "Object b is an instance of type Square: false" alert("Object b is an instance of type Square: " + isSquare); var c = Object.getType(b); name = Object.getTypeName(c); // Output "The type name of object c is: Function" alert("The type name of object c is: " + name); var isSquare = Samples.Square.isInstanceOfType(c); if (isSquare) { var newLength = a.getWidth(); c.setLength(newLength); alert("Object c is a Square with a length of: " + c.getLength()); } } // Run the sample. Samples.testObjectReflection(); </script> </form> </body> </html>
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