weirdness when trying to use attachMovie a class

[skalie]

Actionscript 1.0

I'm attaching a movie made at runtime ("box_mc").

This works....

code:

---

function Box(x_pos,y_pos,dep) {

	attachMovie("box_mc","aName", dep);

	aName._x = x_pos;

	aName._y = y_pos;

}

bla2 = new Box(50,50,2);

bla1 = new Box(100,100,1);

---

This doesn't (level property "dep" lower on first attach), the x_pos and y_pos aren't recognised.

code:

---

function Box(x_pos,y_pos,dep) {

	attachMovie("box_mc","aName", dep);

	aName._x = x_pos;

	aName._y = y_pos;

}

bla1 = new Box(50,50,1);  // changed

bla2 = new Box(100,100,2);  // or swapped

---

Am I missing something basic here?

[catbert303]

You're creating the clip using the same name, so once there is more than 1 aName flash has no way to know which one of these clips you meant to refer to when you use something like aName._x = x

maybe use something like this instead,

var mc = attachMovie("box_mc","aName" + dep, dep);
mc._x = x_pos;
mc._y = y_pos;

Is there are reason to use attachMovie in the a constructor function? if you're creating a movie clip subclass this might be better,

code:

---

function Box() {

    // this.params is created by the initObj argument in the attachMovie call

    this._x = this.params.x;

    this._y = this.params.y;

    // clean up the params object now it has done its job

    delete this.params;

}

// inherit from MovieClip

Box.prototype = new MovieClip();

/*

define other methods for the Box class here, eg



Box.prototype.methodName = function() {

   // do stuff

};



*/



// set up so that clips created from the clip with the linkage id box_mc will be instances of the Box class

Object.registerClass("box_mc", Box);



// now create a couple of boxes

var bla1 = this.attachMovie("box_mc", "box1", 1, {params: {x: 50, y: 50}});

var bla2 = this.attachMovie("box_mc", "box2", 2, {params: {x: 100, y: 100}});

---

[skalie]

Originally posted by catbert303
maybe use something like this instead,

var mc = attachMovie("box_mc","aName" + dep, dep);
mc._x = x_pos;
mc._y = y_pos;

Thank you kindly, adding the "var mc =" was the magical solution.

Is there are reason to use attachMovie in the a constructor function?

Er, inexperience?

Once I get the thing working totally as I foresaw it I will be taking a look at the code you posted to try and work out it's inherent advantages.

Thanks for taking the time to try and help me take my scripting skills to a higher level.