MACROMEDIA DREAMWEAVER MX 2004-EXTENDING DREAMWEAVER Spezifikationen PDF herunterladen (Seite 219)

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101

A simple toolbar command file 219

canAcceptCommand(): enable the toolbar item

The canAcceptCommand() function consists of one line of code that checks to see whether

there is a current Document Object Model (DOM) and whether the document is parsed as

HTML. The function returns the results of those tests. If the conditions are

true,

Dreamweaver enables the text box item on the toolbar. If the function returns the value

false, Dreamweaver disables the item.

The function is as follows:

function canAcceptCommand()

{

return (dw.getDocumentDOM() != null && dw.getDocumentDOM().getParseMode()

== 'html');

}

receiveArguments(): set the title

Dreamweaver invokes the receiveArguments() function, shown in the following example,

when the user enters a value in the Title text box and presses the Enter key or moves the focus

away from the control.

The function is as follows:

function receiveArguments(newTitle)

{

var dom = dw.getDocumentDOM();

if (dom)

dom.setTitle(newTitle);

}

Dreamweaver passes newTitle, which is the value that the user enters, to the

receiveArguments() function. The receiveArguments() function first checks to see

whether a current DOM exists. If it does, the

receiveArguments() function sets the new

document title by passing

newTitle to the dom.setTitle() function.

getCurrentValue(): get the title

Whenever an update cycle occurs, as determined by the default update frequency of the

onEdit event handler, Dreamweaver calls the getCurrentValue() function to determine

what value to display for the control. The default update frequency of the

onEdit handler

determines the update frequency because the Title text edit control has no update attribute.

For the Title text box, the following

getCurrentValue() function calls the JavaScript

application programming interface (API) function

dom.getTitle() to obtain and return the

current title.

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