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AudioMatt

I know this is silly but I nearly missed that I could deduce the sample rate of a buffer like this so 

    var buf = new Buffer("myBuffer");

    post("samplerate: ",buf.samplerate(),"\n"); 

Buffer.prototype.samplerate = function(){

    return 1000*this.framecount()/this.length()

I know this is silly but I nearly missed that I could deduce the sample rate of a buffer like this so for anyone searching in the future:

function bang(){
	var buf = new Buffer("myBuffer");
	post("samplerate: ",buf.samplerate(),"\n"); 
}
Buffer.prototype.samplerate = function(){
	return 1000*this.framecount()/this.length()
}

I know this is silly but I nearly missed that I could deduce the sample rate of a buffer like this so for anyone searching in the future:

f

buffer-samplerate-javascript

Buffer Samplerate Javascript

Federico-AmazingMaxStuff

Here I want to collect all the less intuitive Javascript syntax and techniques for Max. 

Feel free to comment everything that comes to your mind related to the subject, I'll add it to the list. 

Max JS uses ES5 version, so features like "let" and Classes added in ES6 will not work.

https://docs.cycling74.com/max8/vignettes/javascriptinmax

http://max-javascript-reference.tim-schenk.de/

In this video we see how we can call a callback function in JS every time an object in the patcher changes state. 
This is useful for example for creating dynamic UI that can be reduced or expanded without having to use patchcoord connections. 

Download the patch and JS file from my Patreon (1€ Tier) ► 
https://www.patreon.com/posts/patcher-in-js-55403240

Here you can find all my video tutorials ► https://www.federicofoderaro.com/videoTutorials.html

Follow Amazing Max Stuff on Instagram ► https://www.instagram.com/amazingmaxstuff/

Join my Patreon to support Amazing Max Stuff and get lots of Patches for the Visuals ► https://www.patreon.com/mediacoding

Take a look at my shared patches ► https://www.federicofoderaro.com/patches.html

#maxmsp #cycling74 #tutorials #javascript #scripting #objlistener #thispatcher

Max/MSP Patcher Scripting in Javascript | maxobjlistener

Set the input you want to send the next texture:

myGLPix.param("<param_name>", <param_value> / [<array_of_param_values>]);

myGLPix.jit_gl_texture("<texture_to_process_name>");

myGLPix.draw(); // IMPORTANT, the jit.gl.pix obj needs also to draw

var myProcessedTexture = myGLPix.out_name;

Here I want to collect all the less intuitive Javascript syntax and techniques for Max. 
Feel free to comment everything that comes to your mind related to the subject, I'll add it to the list. 

Max JS uses ES5 version, so features like "let" and Classes added in ES6 will not work.

Max's documentation for JS: 
https://docs.cycling74.com/max8/vignettes/javascriptinmax 

Tim's JS Reference:
http://max-javascript-reference.tim-schenk.de/ 

Get keys pressed in JS:
https://github.com/cskonopka/maxJS 

Create a new Max object: 
var myObj = this.patcher.newdefault(<obj_pos_x>, <obj_pos_y>, "<max_obj_name>"); 

Add arguments to Object when creating it: 
var anotherObject = p.newdefault(100, 100, "combine", "text", "::", "moretext")

Add Object to Presentation: 
maxObject.presentation(1);    // note that it's a function

Move Object:maxObject.message("patching_position", [posX, posY]);

Create a new "bpatcher" object with attributes: 
var myNewObject = p.newdefault(100, 100, "bpatcher", "@name", "myPatch", "@args", name);

Get patcher file path:         var filepath = this.patcher.filepath;

Rescale Max Object: 
this.patcher.script("sendbox", <max_obj>.varname, "patching_rect", [ <obj_pos_x>, <obj_pos_y>, <obj_size_x>, <obj_size_y> ]);

Hide a Max Object:
<max_obj>.hidden = val;

Rescale Max Object in Presentation:  
this.patcher.script("sendbox", <max_obj>.varname, "presentation_rect", [ <obj_pos_x>, <obj_pos_y>, <obj_size_x>, <obj_size_y> ]);

Bring to Front/Back Max Object: 
this.patcher.script("bringtofront" / "sendtoback", <max_obj>.varname); 

Connect two Max objects: 
this.patcher.connect(<max_obj_1>, <outlet_index>, <max_obj_2>, <inlet_index>);

Connect two Max objects with hidden cable:  
this.patcher.hiddenconnect(<max_obj_1>, <outlet_index>, <max_obj_2>, <inlet_index>);

Connect the JS object itself with a Max object in the same patch:this.patcher.connect(this.box, <outlet_index>, <max_obj>, <inlet_index>)

Send a message to a Max "receive" object from within JS: 
messnamed("<receive_obj_name>");

Get a named Max object and assign it to a JS object: 
var myMaxObj = this.patcher.getnamed("<obj_varname>");

Get the value of an attribute of a Max object:obj.getboxattr("<attr_name>");

Resize a BPatcher that contains the JS object:
this.patcher.box.rect = [<leftTopX>, <leftTopY>, <bottomRightX>, <bottomRightY>] 

Change size of Max patcher:this.patcher.window( "size", x, y, x + w, y + h ); 
this.patcher.window( "exec" );

Get the size of the current patcher: var size = this.patcher.wind.size;

Get the rect of the current patcher:var rect = this.patcher.wind.location;

Get the rect of the JSUI object box: 
 var objRect = box.rect.slice();
Get size of box.rect = 
var objSize =  [box.rect[2] - box.rect[0], box.rect[3] - box.rect[1]];
box.rect can also be set. 

Create a Folder object and read the file names in the folder: 
var myFolder = new Folder(<folder_path>); 
Set Folder typelist (an empty typelist will make the Folder object read every file type): 
myFolder.typelist = ["<file_type>", "<file_type>", etc...]; 
Read the Folder file names:
while (!myFolder.end) 
{
   post(myFolder.filename); 
   myFolder.next();
}

Basic querying:  

function dictionary(dictname) 
{  
     var d = new Dict(dictname);  
     outlet(0, d.get('layer1key::layer2key'); 
}

Iterating through layers of a Dict:

function dictionary(dictname) 
{   
    var d = new Dict(dictname);    
    var layer1 = d.getkeys();    
    layer1.forEach(function(key)
    {
       var layer2 = d.get(key).getkeys();    
    } 
}
 

Listen to a Max Object for attributes or value changes: 
var myListener = new MaxobjListener(<max_obj>, <callback_function>);
The Callback function can be used like this: 
function MyCallback(data)
{
     data.value;     // the output of the Max object
     data.maxobject; // the object itself
}

To make the "this" inside a callback refer to the current object, you can write the callback directly inside the object in this way:

   var MyCallback = (function(data) 
        {
             post(this.myObjProperty); 
        } ).bind(this);

Create Jitter Matrix: 
var myMatrix = new JitterMatrix("<name_optional>", <int_number_of_planes>, "<type>", [<int_dim_0>, <int_dim_1>, ... ] );

Get name of object as registered from Max:
var objRegName = <jsJitterObj>.getregisteredname();

Create Jitter Object: 
var myJitterObj = new JitterObject("<obj_name>", <argument>);
Example: 
var myJitterObj = new JitterObject("jit.gl.gridshape", "<drawto>"); 

Free Jitter Object Memory (must be done every time a Jitter object is deleted in JS): 
myJitterObj.freepeer();

Use a "jit.gl.pix" object within JS (same for "jit.gl.slab"): 
var myGLPix = new JitterObject("jit.gl.pix"); 
myGLPix.gen = "<genjit_file_path>"; 

        Set the input you want to send the next texture:

myGLPix.activeinput = <int_input_index>

       Set parameters: 
   myGLPix.param("<param_name>", <param_value> / [<array_of_param_values>]);
        Get the processed texture:
   myGLPix.jit_gl_texture("<texture_to_process_name>");
   myGLPix.draw(); // IMPORTANT, the jit.gl.pix obj needs also to draw
   var myProcessedTexture = myGLPix.out_name;

Play a movie with "jit.movie" and get a texture output from within JS: 
First create a dummy matrix, the dimensions don't matter: 

var dummyMat = new JitterMatrix(4, "char", 320, 240);
jit.movie needs output_texture enabled:

var moviePlayer = new JitterObject("jit.movie"); 
moviePlayer.output_texture = 1;
Get new frame and output texture: 

function LoadNewFrame() 
{
    moviePlayer.matrixcalc(dummyMat, dummyMat);
    outlet(0, moviePlayer.texture_name); 
}

       Get the new frame as texture:  newFrame = moviePlayer.texture_name;

Get texture output from jit.gl.node:var texOut = myNode.out_name;

Use a JitterListener to listen to change of state in Jitter Objects: 
https://docs.cycling74.com/max8/tutorials/jitterchapter47?q=jitterlistener

OUTPUTMATRIX from GL objects in JS: 
check out the example patch js.gl.matrixoutput.maxpat in the Files Browser.

JIT.CONCAT in JS: 
var concat = new JitterObject("jit.concat");
concat([leftMat, rightMat], outMat);

Get the TEXTURE name from JIT.GL.NODE: 
return myNode.out_name;
Or: 
myNode.out_names;

Max 4 Live JS guide by Adam Murray:
http://compusition.com/writings/js-live-api-setup


little-bible-of-js-syntax-in-maxmsp

Hi, I think the real bible is this https://docs.cycling74.com/max8/vignettes/javascriptinmax, isn't it ?

btw: the JitterListener link doesn't work. 

Thank you Olsen, that's a great resource, will pin it to the top. 
However I find that it's still useful to collect all the Jitter syntax and the more esoteric things (like "activeinput" for jit.gl.pix and jit.gl.slab) which are not immediately recollected from the documentation. 

If nothing else, I will use this post to note things I encounter and that I wish to remember. 

Oh yes, Tim's website is a bit funky, thanks for noting



try this link for Tim's JS site - http://max-javascript-reference.tim-schenk.de/ 

(and thanks much for collecting these Federico, hugely helpful)

Thank you Rob, wanted to point to a precise article, but will pin Tim's website as well as a resource. 

Might be nice to have some more advanced new object examples

Here are some from my own patches
var myNewObject = p.newdefault(100, 100, "bpatcher", "@name", "myPatch", "@args", name);

var anotherObject = p.newdefault(100, 100, "combine", "text", "::", "moretext")

Javascript Forum