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functionnode-red

Node-red - need a multi-input function for a number value

So I'm just getting to grips with node-red and I need to create a conditional global function.

I have two separate global.payloads set to a number value of either 0 or 1.

What I need to happen now is, if global.payload is equal to value 1 then follow this flow, if it is equal to value 0 then follow this one.

I'm just a little confused with the syntax for the function statement. Any help gratefully appreciated.

Solution

  • Since you haven't accepted the current answer, thought I'd give this a try. I think this is what you need to handle inputs from two separate global contexts. I'm simulating them here with two separate inject nodes to demonstrate:

    enter image description here

    The checkconf inject node emits a 1 or a 0. Same for the meshstatus node. Substitute your real inputs for those inject nodes. The real work is done inside the function:

    var c = context.get('c') || 0;  // initialize variables
var m = context.get('m') || 0;

if (msg.topic == "checkconf")  // update context based on topic of input
{
    c = {payload: msg.payload};
    context.set("c", c);  // save last value in local context
}

if (msg.topic == 'meshstatus') // same here
{
    m = {payload: msg.payload};
    context.set('m', m); // save last value in local context
}

// now do the test to see if both inputs are triggered...
if (m.payload == 1) // check last value of meshstatus first
{
    if (c.payload == 1)  // now check last value of checkconf
        return {topic:'value', payload: "YES"};
}
else
    return {topic:'value', payload: "NO"};

    Be sure to set the "topic" property of whatever you use as inputs so the if statements can discriminate between the two input. Good luck!