Script¶

The Script node converts the payload into another format using JavaScript.

Node Type¶

Action.

Input and Output Ability¶

This node has 1 entry point and 1 exit point. The input and output can be any format. You can define the format using the JavaScript you write, and the return data is the output message.

Note

Does not support Javascript ES6.

Node Properties¶

Settings Tab¶

Name

The name for this node.

Description

The description for this node.

Script Tab¶

The JavaScript (ES8 supported) for converting the input into the desired format. The supported function is transform with two parameters, msg and metadata. The msg is the input message, and the metadata can be the MQTT topic for example, which can be used in the script.

Built-in JavaScript functions are also available. For the list of available functions, see Built-in JS Functions Overview.

Click the Test button to test your JavaScript by entering the input message to see if your JavaScript works as designed.

Limitations¶

msg and metadata needs to be returned in the script function.
Does not support Javascript ES6.

Samples¶

Input Sample¶

The input is dependent on what the script requires.

Output Sample¶

The output is subject to how the script processes the input.

Script Sample¶

if(!msg.Data){
  return tools.resultBuilder.build(false);
}
var dataArray = msg.Data.data;
var stream = msg.Data.stream;
var device_id = stream.camera;
var flag = true;

for (var i=0; i<dataArray.length; i++) {
  var data = dataArray[i];
  if(!data.eventName){
    flag = false;
    break;
  }

  var paramsArray = new Array();
  if(data.eventName === "Event1"){
    var mps = {};
    mps["raw_data_count"] = JSON.stringify(data.count);
    mps["alarm_data_event_name"] = data.eventName;
    mps["raw_data_imgpath"] = JSON.stringify(data.imgpath);
    mps["raw_data_start_time"] = data.startTime;
    mps["raw_data_timestamp"] = data.timestamp;
    mps["raw_stream_camera"] = stream.camera;

    var params = {};
    params["measurepoints"] = mps;
    params["time"] = new Date().getTime();
    params["device_id_no"] = device_id;
    paramsArray.push(params);
  }else{
    paramsArray = metadata.params;
  }
}

if(!flag){
  return tools.resultBuilder.build(false);
}

return tools.resultBuilder.build(true,JSON.stringify(paramsArray));