controller - Javascript ERROR, undefined, not an object -

i new in javascript, , trying map controller's buttons , leds mixxx application. object, array? var missing.

behringercmdmm1.leds = [     // master     { "shiftbutton" : 0x12 },     // deck 1     {  "sync" : 0x30  },     // deck 2     {  "sync" : 0x33  } ]; 

i have error here,

behringercmdmm1.shiftbutton = function (channel, control, value, status, group) { // note there no 'if (value)' here executes both when shift button pressed , when released. // therefore, behringercmdmm1.shift true while shift button held down var deck = behringercmdmm1.grouptodeck(group); behringercmdmm1.shift = !behringercmdmm1.shift // '!' inverts value of boolean (true/false) variable behringercmdmm1.setled(behringercmdmm1.leds[deck]["shiftbutton"], behringercmdmm1.shift); 

}

about "shiftbutton" undefined.

also have function

behringercmdmm1.setled = function(value, status) {  status = status ? 0x7f : 0x00; midi.sendshortmsg(0x94, value, status); 

}

this javascript file found on internet created different controller. so, trying things understand how can configure mine.

behringercmdmm1.leds array of objects. within array, element @ index 0 object has shiftbutton property. thus, way 0x12 value in example this:

behringercmdmm1.leds[0]['shiftbutton']

so when code executes...

var deck = behringercmdmm1.grouptodeck(group);

...the value of deck other 0, , you're accessing 1 of sync objects in behringercmdmm1.leds array. example, if value of deck 1, this...

behringercmdmm1.leds[deck]['shiftbutton']

...will undefined because you're doing this:

behringercmdmm1.leds[1]['shiftbutton']