Adobe Extending Dreamweaver CS4 Manuel d'utilisateur télécharger pdf (Page 247)

241

EXTENDING DREAMWEAVER CS4

Behaviors

Returns

Dreamweaver expects either a string that contains the JavaScript functions or a string that contains the names of the

functions to be inserted in the user’s document. This value must be exactly the same every time (it cannot depend on

user input). The functions are inserted only once, regardless of how many times the action is applied to elements in

the document.

Note: Quotation marks ("")within the returned string must be preceded by a backslash (\) escape character to avoid

errors that the JavaScript interpreter reports.

Example

The following instance of the behaviorFunction() function returns the MM_popupMsg() function:

function behaviorFunction(){

return ""+

"function MM_popupMsg(theMsg) { //v1.0\n"+

"alert(theMsg);\n"+

"}";

}

The following example is equivalent to the preceding behaviorFunction() declaration and is the method used to

declare the

behaviorFunction() function in all behaviors that come with Dreamweaver:

function MM_popupMsg(theMsg){ //v1.0

alert(theMsg);

}

function behaviorFunction(){

return "MM_popupMsg";

}

canAcceptBehavior()

Description

This function determines whether the action is allowed for the selected HTML element and specifies the default event

that should trigger the action. Can also check for the existence of certain objects (such as SWF files) in the user’s

document and not allow the action if these objects do not appear.

Arguments

HTMLElement

The argument is the selected HTML element.

Returns

Dreamweaver expects one of the following values:

• A true value if the action is allowed but has no preferred events.

• A list of preferred events (in descending order of preference) for this action. Specifying preferred events overrides

the default event (as denoted with an asterisk [*] in the Event file) for the selected object. See step 1 in

“How

Behaviors work” on page 234.

• A false value if the action is not allowed.

If the canAcceptBehavior() function returns a false value, the action is dimmed in the Actions pop-up menu

on the Behaviors panel.

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Adobe Extending Dreamweaver CS4 Manuel d'utilisateur Page 247

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