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node-red-nodes/function/rbe/rbe.js

53 lines
1.7 KiB
JavaScript

/**
* Copyright 2014 IBM Corp.
*
* 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) {
"use strict";
function RbeNode(n) {
RED.nodes.createNode(this,n);
this.func = n.func || "rbe";
this.gap = n.gap || 0;
var node = this;
var previous = null;
this.on("input",function(msg) {
if (msg.hasOwnProperty("payload")) {
if (this.func === "rbe") {
if (msg.payload != previous) {
previous = msg.payload;
node.send(msg);
}
}
else {
var n = parseFloat(msg.payload);
if (!isNaN(n)) {
if (previous == null) { previous = n - node.gap; }
if (Math.abs(n - previous) >= node.gap) {
previous = n;
node.send(msg);
}
}
else {
node.warn("no number found in payload");
}
}
} // ignore msg with no payload property.
});
}
RED.nodes.registerType("rbe",RbeNode);
}