Pure JavaScript

File.prototype

NES3+, ECMAScript 1.0+Syntax

							file.prototype.method = methodName
							file.prototype.property
						

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 methodName of the method you have defined.

Example

Listing 8.81 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 is written to the page.

Listing 8.81 Using the prototype Property to Create a New Property and Method

<SERVER> // Define the method that we prototyped function verifyTEXT(){ // Check to see if ...