Adobe Extending Dreamweaver CS4 Manuale Utente Scaricare il pdf (Pagina 189)

183

EXTENDING DREAMWEAVER CS4

Toolbars

checked="script"

This attribute is required for check buttons and radio buttons. Dreamweaver ignores the checked attribute for other

types of items. As with menus, the script returns a value that specifies whether the item is checked or unchecked. The

checked attribute is equivalent to isCommandChecked() in a toolbar command file. If you do not specify this

attribute, it defaults to unchecked.

Example

checked="dw.getDocumentDOM() != null && dw.getDocumentDOM().getView() == 'code'"

value="script"

This attribute is required for pop-up menus, combo boxes, text boxes, and color pickers. Dreamweaver ignores the

value attribute for other types of items.

To determine what value to display for pop-up menus and combo boxes, Dreamweaver first calls

isCommandchecked() for each item in the menu. If the isCommandchecked() function returns a true value for any

items, Dreamweaver displays the value for the first one. If no items return a

true value or the isCommandChecked()

function is not defined, Dreamweaver calls the

getCurrentValue() function or executes the script that the value

attribute specifies. If the control is a combo box, Dreamweaver displays the returned value. If the control is a pop-up

menu, Dreamweaver temporarily adds the returned value to the list and displays it.

In all other cases, the script returns the current value to display. For pop-up menus or combo boxes, this value should

be one of the items in the menu list. For combo boxes and text boxes, the value can be any string that the script returns.

For color pickers, the value should be a valid color but Dreamweaver does not enforce this.

The value attribute is equivalent to the getCurrentValue() function in a toolbar command file.

update="update_frequency_list"

Optional. This attribute specifies how often the enabled, checked, showif, and value handlers should run to update

the visible state of the item. The

update attribute is equivalent to the getUpdateFrequency() function in a toolbar

command file.

You must specify the update frequency for toolbar items because these items are always visible, unlike menu items. For

this reason, you should always select the lowest frequency possible and make sure your handlers for the

enabled,

checked, and value handlers are as simple as possible.

The following list shows the possible handlers for update_frequency_list, from least to most frequent. If you do not

specify the

update attribute, the update frequency defaults to onEdit frequency. You can specify multiple update

frequencies, separated by commas. The handlers run on any of the following specified events:

• onServerModelChange executes when the server model of the current page changes.

• onCodeViewSyncChange executes when the Code view becomes in or out of sync with the Design view.

• onViewChange executes whenever the user switches focus between Code view and Design view or when the user

changes between Code view, Design view, or Code and Design view.

• onEdit executes whenever the document is edited in Design view. Changes that you make in Code view do not

trigger this event.

• onSelChange executes whenever the selection changes in Design view. Changes that you make in Code view do not

trigger this event.

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