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CHAPTER 2: The ExtendScript Toolkit Debugging in the Toolkit 33

Evaluation in help tips

If you let your mouse pointer rest over a variable or function in a document window, the result of

evaluating that variable or function is displayed as a help tip. When you are not debugging the program,

this is helpful only if the variables and functions are already known to the JavaScript engine. During

debugging, however, this is an extremely useful way to display the current value of a variable, along with

its current data type.

Tracking data

The Data Browser panel is your window into the JavaScript engine. It displays all live data defined in the

current context, as a list of variables with their current values. If execution has stopped at a breakpoint, it

shows variables that have been defined using

var in the current function, and the function arguments. To

show variables defined in the global or calling scope, use the Call Stack to change the context (see “

The

call stack” on page 34).

You can use the Data Browser to examine and set variable values.

X Click a variable name to show its current value in the edit field at the top of the panel.

X To change the value, enter a new value and press ENTER. If a variable is Read only, the edit field is

disabled.

The flyout menu for this panel lets you control the amount of data displayed:

X Undefined Variables toggles the display of variables whose value is undefined (as opposed to null).

X Functions toggles the display of all functions that are attached to objects. Most often, the interesting

data in an object are its callable methods.

X Core JavaScript Elements toggles the display of all data that is part of the JavaScript language

standard, such as the Array constructor or the Math object.

X Prototype Elements toggles the display of the JavaScript object prototype chain.

Each variable has a small icon that indicates the data type. An invalid object (that is, a reference to an

object that has been deleted) shows the object icon crossed out in red. An undefined value has no icon.

Examine or modify

selected variable’s value

Object opened to

show properties

flyout

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EDOBE XDOM TAKE 6 IR - PRODUCTSHEET Especificações Página 33