node-red-contrib-smartnode/logic/changeSign/change-sign.js

this project is a nodejs package for making the nodered support the Smart Device development. the pacakge require node-red enviroment.

/**
 * Copyright 2015, 2015 MakerCollider.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 **/

module.exports = function(RED) {
    function changeSign(config) {
        RED.nodes.createNode(this, config);
        var node = this;

        this.on('input', function(msg) {
            if (!isNaN(msg.payload)) {
                msg.payload *= -1;
                node.send(msg);
            }
        });

        //clean up when re-deploying
        this.on('close', function() {
        });
    }
    
    RED.nodes.registerType("change-sign", changeSign);
}