oli larkin

https://cycling74.com/forums/index.php?t=msg&goto=160274&rid=1876&S=0d2e85251e5eb656429d35673c9c869a&srch=class+wrap#msg_160274

...Just make a .js file (name isn't important), and

put it in the jsextensions folder. For each "nobox" class you'd like

to wrap with a JS interface, add a line like the following:

maxclasswrap("mymaxclassname","MyJavascriptClassName");

This will automatically create a class definition wrapped with the

appropriate methods and instantiable in JS like this

var mything = new MyJavascriptClassName();

I modified the simplemax example to be a NOBOX. And then i added this to a js file in jsextensions:

maxclasswrap("simplemax","TriggerPopup");

but when i try and call this from a js file i get an error:

js: Macintosh HD:/Users/oli/Desktop/poptest.js: Javascript ReferenceError: TriggerPopup is not defined, line 9

Quote:
...Just make a .js file (name isn't important), and
put it in the jsextensions folder. For each "nobox" class you'd like
to wrap with a JS interface, add a line like the following:

This will automatically create a class definition wrapped with the
appropriate methods and instantiable in JS like this

maxclasswrap

Has you nobox object been loaded by Max prior to trying to use it from js? For example, have you put the .mxo/.mxe into the Cycling '74/extensions folder prior to launching Max?

JS should be able to wrap the class this way, but the class has to be loaded first.

Has you nobox object been loaded by Max prior to trying to use it from js?  For example, have you put the .mxo/.mxe into the Cycling '74/extensions folder prior to launching Max?  

JS should be able to wrap the class this way, but the class has to be loaded first.


yes, i did that. It turns out you have to do:

without setting CLASS_FLAG_POLYGLOT, JS wasn't seeing my object

c->c_flags = CLASS_FLAG_POLYGLOT;
class_register(CLASS_NOBOX, c);

And for the record, you can then access to attributes of your nobox object:

var toto = new MyClass()
post(toto.myattribute, "n");
toto.myattribute = 74;
post(toto.myattribute, "n");

and if you want to make methods that returns something, you need to use the A_GIMMEBACK signature. For instance:

class_addmethod(c, (method)simplemax_doabs,                "doabs",        A_GIMMEBACK, 0);

t_max_err simplemax_doabs(t_simplemax *x, t_symbol *s, long ac, t_atom *av, t_atom *rv)
{
    t_atom a;
    double f = 0;

    if (ac) {
        if (atom_gettype(av) == A_LONG)
            f = fabs(atom_getlong(av));
        else if( atom_gettype(av) == A_FLOAT)
            f = fabs(atom_getfloat(av));
    } else
        error("missing argument for method doabs()");

    atom_setfloat(&a, f);

    atom_setobj(rv, object_new(gensym("nobox"), gensym("atomarray"), 1, &a));
    return MAX_ERR_NONE;
}


class_addmethod(c, (method)simplemax_doabs,				"doabs",		A_GIMMEBACK, 0);

t_max_err simplemax_doabs(t_simplemax *x, t_symbol *s, long ac, t_atom *av, t_atom *rv)
{
	t_atom a;
	double f = 0;

	if (ac) {
		if (atom_gettype(av) == A_LONG)
			f = fabs(atom_getlong(av));
		else if( atom_gettype(av) == A_FLOAT)
			f = fabs(atom_getfloat(av));
	} else
		error("missing argument for method doabs()");

	atom_setfloat(&a, f);

	atom_setobj(rv, object_new(gensym("nobox"), gensym("atomarray"), 1, &a));
	return MAX_ERR_NONE;
}
