Determine TX value using Chain's getTransaction method.

txvalue.js

var getValues = function(hash, callback) {

  var is_input_info, is_output_info;
  var is_input  = false;
  var is_output = false;
  var satoshi   = 100000000;

  for (var j = 0; j < hash.inputs.length; j++){
     for (var k = 0; k < hash.inputs[j].addresses.length; k++){
        if(hash.inputs[j].addresses[k] == wallet){
           is_input = true;
           is_input_info = j;
        }
     }
  }
  for (var m = 0; m < hash.outputs.length; m++){
     for (var n = 0; n < hash.outputs[m].addresses.length; n++){
        if(hash.outputs[m].addresses[n] == wallet){
           is_output = true;
           is_output_info = m;
        }
     }
  }

  if (is_output && is_input){
     //CASE: sent & changeback

     val = (hash.inputs[is_input_info].value - hash.outputs[is_output_info].value)/satoshi;
    
     callback(val);

  }else if(is_input && !is_output){
     //CASE: only sent

     val = hash.inputs[is_input_info].value/satoshi;

     callback(val);;

  }else if(!is_input && is_output){

     //CASE: recv
     val = hash.outputs[is_output_info].value/satoshi;

     callback(val);

  }else{
     callback(val);
  }
};

chain.getTransaction('{hash}', function(err, data) {
  getValues(data, function(v) {
    console.log(v);
  });
});