Messaging

How to send & receive inter-control messages

Functions

OAT.MSG.send(sender, message, event)

Dispatches a message.

• sender - to object sending this message.
• message - a constant, defined in OAT.MSG. Developers are encouraged to add more message types. Examples include OAT_LOAD,TREE_EXPAND, and AJAX_FAILURE.
• event - an object carrying data relevant to this message; no particular format is required.

OAT.MSG.attach(sender, message, callback)

Subscribes to messages.

• sender - the object whose messages we want to receive; value of "*" means ALL senders.
• message - the message we want to receive; it is possible to use "*" or RegExpmatches here.
• callback - When a message arrives, callback is executed with arguments passed to appropriate OAT.MSG.send()function.

OAT.MSG.detach(sender, message, callback)

Detaches previously set message receiving handler. All three fields must match.

Example

/* assume that there exists OAT.MSG.CUSTOM_MESSAGE */

function myMessageHandler(source, message, event) {
        alert("Message arrived!"(;
}

/* subscribe to receiving... */
OAT.MSG.attach("*","CUSTOM_.*",myMessageHandler);

/* dispatch message */
OAT.MSG.send(this, OAT.MSG.CUSTOM_MESSAGE, {}); // will invoke myMessageHandler