Adobe Extending Dreamweaver CS4 - Manual (Page 164)

158 EXTENDING DREAMWEAVER CS4
Menus and menu commands
function canAcceptCommand()
{
var PIB = dw.getBrowserList();
if (arguments[0] == 'primary' || arguments[0] == 'secondary')
return havePreviewTarget();
return havePreviewTarget() && (PIB.length > 0);
}
The canAcceptCommand() function in the PIB_Dynamic.js file again retrieves the browser list that was created in the
Preferences dialog box. Then it checks whether the first argument ( arguments[0] ) is primary or secondary. If so, it
returns the value returned by the havePreviewTarget() function. If not, it tests the call to the
havePreviewTarget() function and tests whether any browsers have been specified ( PIB.length > 0 ). If both tests
are true, the function returns the value true . If either or both of the tests are false, the function returns the value
false .
havePreviewTarget()
The
havePreviewTarget() function is a user-defined function that returns the value true if Dreamweaver has a valid
target to display in the browser. A valid target is a document or a selected group of files in the Site panel. The
havePreviewTarget() function looks like the following example:
function havePreviewTarget()
{
var bHavePreviewTarget = false;
if (dw.getFocus(true) == 'site')
{
if (site.getFocus() == 'remote')
{
bHavePreviewTarget = site.getRemoteSelection().length > 0 &&
site.canBrowseDocument();
}
else if (site.getFocus() != 'none')
{
var selFiles = site.getSelection();
if (selFiles.length > 0)
{
var i;
bHavePreviewTarget = true;
for (i = 0; i < selFiles.length; i++)
{
var selFile = selFiles[i];
// For server connections, the files will
// already be remote URLs.
if (selFile.indexOf("://") == (-1))
{
var urlPrefix = "file:///";
var strTemp = selFile.substr(urlPrefix.length);
if (selFile.indexOf(urlPrefix) == -1)