MACROMEDIA DREAMWEAVER MX 2004-EXTENDING DREAMWEAVER Specifiche Scaricare il pdf (Pagina 171)

100

101

A simple command example 171

To determine whether the command should be active or dimmed:

1. Create a new blank file.

2. Add the following code:

function canAcceptCommand(){

var theDOM = dw.getDocumentDOM(); // Get the DOM of the current

document

var theSel = theDOM.getSelection(); // Get start and end of selection

var theSelNode = theDOM.getSelectedNode(); // Get the selected node

var theChildren = theSelNode.childNodes; // Get children of selected

node

return (theSel[0] != theSel[1] && (theSelNode.nodeType ==

Node.TEXT_NODE¬

|| theSelNode.hasChildNodes() && (theChildren[0].nodeType == ¬

Node.TEXT_NODE)));

}

Save the file as Change Case.js in the Configuration/Commands folder.

The first lines of the

canAcceptCommand() function retrieve the selected text by retrieving the

DOM for the user’s document and calling the

getSelection() function on the document

object. Next, the function retrieves the node that contains the selected text, followed by any

children of the node, as shown in the following code. Then, the last line checks to see if the

selection or its first child is text and returns the result as a value of

true or false.

The first part of the

return statement (theSel[0] != theSel[1]) checks if the user has

selected anything in the document. The variable

theSel is a two-slot array that holds the

beginning and ending offsets of the selection within the document. If the two values are not

equal, content has been selected. If the values in the two slots are equal, there is only an

insertion point and nothing has been selected.

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MACROMEDIA DREAMWEAVER MX 2004-EXTENDING DREAMWEAVER Specifiche Pagina 171

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