MACROMEDIA DREAMWEAVER MX 2004-EXTENDING DREAMWEAVER Specifiche Scaricare il pdf (Pagina 170)

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170 Commands

The contents of the Title tag, Make Uppercase or Lowercase, appears in the top bar of

the dialog box. Within the form, a table with two cells controls the layout of the elements.

Within the table cells are the two radio buttons, Uppercase and Lowercase. The Uppercase

button has the

checked attribute, making it the default selection and ensuring that the user

must either select one of the two buttons or cancel the command.

The form looks like the following figure.

The commandButtons() function supplies the OK and Cancel buttons that let the user

submit the choice or cancel the operation.

Writing the JavaScript code

The following example consists of two extension API functions, canAcceptCommand() and

commandButtons(), which Dreamweaver calls, and one user-defined function,

changeCase(), which is called from the commandButtons() function.

In this example, you will write JavaScript to perform the following tasks:

■ Determining whether the command should be enabled or dimmed

■ Linking functions to the OK and Cancel buttons

■ Letting the user specify uppercase or lowercase

Determining whether the command should be enabled or

dimmed

The first task in creating a command is to determine when the item should be active and

when it should be dimmed. When a user clicks the Commands menu, Dreamweaver calls the

canAcceptCommand() function for each menu item to determine whether it should be

enabled. If

canAcceptCommand() returns the value true, Dreamweaver displays the menu

item text as active or enabled. If

canAcceptCommand() returns the value false, Dreamweaver

dims the menu item. In this example, the menu item is active when the user has selected text

in the document.

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MACROMEDIA DREAMWEAVER MX 2004-EXTENDING DREAMWEAVER Specifiche Pagina 170

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