Adobe Extending Dreamweaver CS4 Manuel d'utilisateur télécharger pdf (Page 160)

154

EXTENDING DREAMWEAVER CS4

Menus and menu commands

function canAcceptCommand()

{

var selarray;

if (arguments.length != 1) return false;

var bResult = false;

var whatToDo = arguments[0];

if (whatToDo == "undo")

{

bResult = dw.canUndo();

}

else if (whatToDo == "redo")

{

bResult = dw.canRedo();

}

return bResult;

}

receiveArguments()

Dreamweaver calls the receiveArguments() function to process any arguments that you defined for the menuitem

tag. For the Undo and Redo menu items, the

receiveArguments() function calls either the dw.undo() function or

the

dw.redo() function, depending on whether the value of the argument, arguments[0], is "undo" or "redo". The

dw.undo() function undoes the previous step that the user performed in the document window, dialog box, or panel

that has focus. The

dw.redo() function redoes the last operation that was undone.

The receiveArguments() function looks like the following example code:

function receiveArguments()

{

if (arguments.length != 1) return;

var whatToDo = arguments[0];

if (whatToDo == "undo")

{

dw.undo();

}

else if (whatToDo == "redo")

{

dw.redo();

}

In this command, the receiveArguments() function processes the arguments and executes the command. More

complex menu commands might call different functions to execute the command. For example, the following code

checks whether the first argument is

"foo"; if it is, it calls the doOperationX() function and passes it the second

argument. If the first argument is

"bar", it calls the doOperationY() function and passes it the second argument. The

doOperationX() or doOperationY() function is responsible for executing the command.

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Adobe Extending Dreamweaver CS4 Manuel d'utilisateur Page 160

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