Description
The prototype property of the File object allows you to add methods and properties to the File object. If you are adding a method, you set the instance equal to the name of the method you have defined.
Example
Listing 9.113 creates a new property and method of the File object. An instance is created and the new property is set. The new method is then called to verify the property, and, if it is incorrect (which it is), an error message is written to the page.
Listing 9.113 Using the prototype Property to Create a New Property and Method
<server>// Define the method that we prototyped. function verifyTEXT(){// Check to see if the type property we added is set to a valid value. if(this.type == "text"){ return true; }else{ return false; } } ...
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