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node-red-nodes/99-sample.js.demo
2016-11-06 20:26:19 +00:00

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// If you use this as a template, update the copyright with your own name.
// Sample Node-RED node file
module.exports = function(RED) {
"use strict";
// require any external libraries we may need....
//var foo = require("foo-library");
// The main node definition - most things happen in here
function SampleNode(n) {
// Create a RED node
RED.nodes.createNode(this,n);
// Store local copies of the node configuration (as defined in the .html)
this.topic = n.topic;
// copy "this" object in case we need it in context of callbacks of other functions.
var node = this;
// Do whatever you need to do in here - declare callbacks etc
// Note: this sample doesn't do anything much - it will only send
// this message once at startup...
// Look at other real nodes for some better ideas of what to do....
var msg = {};
msg.topic = this.topic;
msg.payload = "Hello world !"
// send out the message to the rest of the workspace.
// ... this message will get sent at startup so you may not see it in a debug node.
this.send(msg);
// respond to inputs....
this.on('input', function (msg) {
node.warn("I saw a payload: "+msg.payload);
// in this example just send it straight on... should process it here really
node.send(msg);
});
this.on("close", function() {
// Called when the node is shutdown - eg on redeploy.
// Allows ports to be closed, connections dropped etc.
// eg: node.client.disconnect();
});
}
// Register the node by name. This must be called before overriding any of the
// Node functions.
RED.nodes.registerType("sample",SampleNode);
}