Quick References
      ADO
      ASP
      CSS2
      HTML
      JavaScript
      Jet SQL
      VBScript
      WML
      WMLScript
      WSH
      XHTML
      XML DOM
      XSLT

Features
      Knowledge Base
      Tutorials

Partners
     ZVON.ORG
     XML
     Planet Source Code
     VisualBuilder
     Web Design
     Your HTML Source
     XML/XSLT Forums
     ASPAlliance
     Scripts
     
     Programmers Heaven
     Tek-Tips Forums
     Developer Fusion
     Code Project











METHOD:  Object::valueOf
Object.valueOf()
 
The valueOf method returns a primitive value for a specified object and is inherited by all objects descended from Object. It is usually called automatically by JavaScript behind the scenes whenever it encounters an object where a primitive value is expected. If the object has no primitive value, then the object itself is returned as [object Object]. You can also call valueOf yourself to convert a built-in object into a primitive value. The following two examples illustrate uses of it:
 
Code:
(Object.valueOf()
 
Output:
function Object() { [native code] }
 
Code:
function Cat(breed, name, age)
{
   this.breed = breed
   this.name = name
}
Cat.valueOf()
 
Output:
function Cat(breed, name, age) { this.breed = breed this.name = name }
 
The valueOf method can also be overwritten in a custom object by assigning a user-defined function with no arguments in its place as follows:
 
Code:
Cat.prototype.valueOf() = myValueOf()
 
NOTE:
 
Every core JavaScript object will over-ride the valueOf method to return an appropriate value.

 


Copyright 1999-2005 by Infinite Software Solutions, Inc. All rights reserved.
Trademark Information