Type.isInstanceOfType Method
Returns a value that indicates whether an object is an instance of a specified class or of one of its derived classes.
var isInstanceOfTypeVar = TypeA.isInstanceOfType(instance);
The following example shows how to use the isInstanceOfType method to determine whether one class is an instance of another class.
<!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>Untitled Page</title> </head> <body> <form id="form1" runat="server"> <asp:ScriptManager runat="server" ID="ScriptManager1"> </asp:ScriptManager> <script type="text/javascript"> // Register classes to test. Type.registerNamespace('Samples'); Samples.A = function() { // Initialize as a base class. Samples.A.initializeBase(this); } Samples.A.registerClass('Samples.A'); Samples.B = function(){} Samples.B.registerClass('Samples.B', Samples.A); Samples.C = function(){} // Register class Samples.C as derived from Samples.A Samples.C.registerClass('Samples.C'); var test; // Output: "true". test = Samples.B.inheritsFrom(Samples.A); alert(test); // Output: "false". test = Samples.C.inheritsFrom(Samples.A); alert(test); // Output: "false". test = Samples.A.isInstanceOfType(Samples.B); alert(test) </script> </form> </body> </html>
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