Handling loadbang() and notifydeleted() conflicts in Javascript in Max/MSP

max-deletion-flags.js

//  G L O B A L   V A R I A B L E S

// set ID for module
var modulename = 'my-module';
// or if the [js] object is given a first argument, use that
if (jsarguments.length > 1) {
	modulename = jsarguments[1];
}

// set unique ID for each module instance with random number generator
var instanceID = Math.round(Math.random()*100000);
// or if the [js] object is given a second argument use that — should be #0 within your patch
if (jsarguments.length > 2) {
	instanceID = jsarguments[2];
}

// initialise global dictionary to hold our instantiation flags
var instantiationFlags = new Dict("instantiation-flags");


//  G L O B A L   M E T H O D S

// notifydeleted -- called when module deleted
function notifydeleted() {
  // make sure our deleted instance ID still matches the ID stored
  // in the dictionary before running notifydeleted() functions
	if(instantiationFlags.get(modulename)) {
		testid = instantiationFlags.get(modulename);
		if(testid == instanceID) {
			// YOUR ON-DELETION FUNCTIONS GO HERE
			post(modulename, "has been deleted.\n");
			flagsOff();
		}
	}
}

// loadbang -- called when [bpatcher] is created or reinstantiated
function loadbang() {
	// YOUR ON-(RE)INSTANTIATION FUNCTIONS GO HERE
	post(modulename, "has been created or reinstantiated.\n");
	flagsOn();
	if(instantiationFlags.get(modulename)) {
		// YOUR ON-REINSTANTIATION FUNCTIONS GO HERE
		post(modulename, "has been reinstantiated.\n");
	}
	if(!instantiationFlags.get(modulename)) {
		// YOUR ON-FIRST-INSTANTIATION FUNCTIONS GO HERE
		post(modulename, "has been created.\n");
	}
}

//  I N S T A N T I A T I O N   F L A G S

flagsOn.local = 1; // make sure we can’t trigger this with a message
function flagsOn() {
	// store the current instance ID for our module in the instantiationFlags dictionary
	instantiationFlags.replace(modulename, instanceID);
}

flagsOff.local = 1; // make sure we can’t trigger this with a message
function flagsOff() {
	// remove the entry for our module from the instantiationFlags dictionary
	instantiationFlags.remove(modulename);
}