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CHAPTER 8: ExtendScript Tools and Features ExtendScript reflection interface 221

ExtendScript reflection interface

ExtendScript provides a reflection interface that allows you to find out everything about an object,

including its name, a description, the expected data type for properties, the arguments and return value

for methods, and any default values or limitations to the input values.

Reflection object

Every object has a reflect property that returns a reflection object that reports the contents of the

object. You can, for example, show the values of all the properties of an object with code like this:

var f = new File ("myfile");

var props = f.reflect.properties;

for (var i = 0; i < props.length; i++) {

$.writeln(’this property ’ + props[i].name + ’ is ’ + f[props[i].name]);

}

Reflection object properties

All properties are read only.

Reflection object functions

description

String Short text describing the reflected object, or undefined if no

description is available.

help

String Longer text describing the reflected object more completely, or

undefined if no description is available.

methods

Array of

ReflectionInfo

An Array of ReflectionInfo objects containing all methods of the

reflected object, defined in the class or in the specific instance.

name

String The class name of the reflected object.

properties

Array of

ReflectionInfo

An Array of ReflectionInfo objects containing all properties of the

reflected object, defined in the class or in the specific instance. For

objects with dynamic properties (defined at runtime) the list contains

only those dynamic properties that have already been accessed by

the script. For example, in an object wrapping an HTML tag, the

names of the HTML attributes are determined at run time.

find()

reflectionObj.find (name)

name

The property for which to retrieve information.

Returns the ReflectionInfo object

for the named property of the reflected object, or null if no such

property exists.

Use this method to get information about dynamic properties that have not yet been accessed, but

that are known to exist.

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