Head first developing MM module for extreme beginners

Dobi

@sdetweil I gave it a try but without differences :(
I made a new git repo : https://github.com/Dobherrmann/MMM-cookbook.git
Now there I should have the same name in the repo like my module.

my config. js looks like this (I gave it a position):

 {
      module: "MMM-cookbook",
      position: "middle_center",
      config: {
        header: "My Cookbook",
        foo: "I'm the King of the world!"
      }
    },

I started to debug “my code” a little bit and I found this when I want to send a socket notification:

self.sendSocketNotification("DO_YOUR_JOB", this.count);
					console.log("Notfication", this.sendSocketNotification("DO_YOUR_JOB", this.count))
					this.sendSocketNotification("DO_YOUR_JOB", this.count)
					this.subElementUp.innerHTML = "Count UP:" + this.count

On my console i get the feedback that “this.sendSocketNotification(“DO_YOUR_JOB”, this.count” is undefined. It looks like that this function is unkown.

sdetweil

@dobi u are inside a callback. change the ‘this’ to ‘self’ like the self.sendSocketNotification

‘this’ is always tricky. depends on the context, and some of the programming idioms used

that’s why we typically see
var self = this;
at the beginning of functions that have callbacks or .then() used inside

Dobi

@sdetweil ok, but it dosen’t change something.

notificationReceived: function (notification, payload, sender) {
		self = this;
		switch (notification) {
			case "DOM_OBJECTS_CREATED":
				var timer = setInterval(() => {
					//this.updateDom()
					self.sendSocketNotification("DO_YOUR_JOB", this.count);
					console.log(`self.sendSocketNotification("DO_YOUR_JOB", this.count)`, self.sendSocketNotification("DO_YOUR_JOB", this.count))
					self.sendSocketNotification("DO_YOUR_JOB", this.count)
					this.subElementUp.innerHTML = "Count UP:" + this.count
					this.count++
				}, 1000)
				break
		}
	},

Now i could post a picture of my console

sdetweil

@dobi show the source code page. u had to fix both counters

sources tab, modules, mmm-cookbook, mmm-cookbook.js

sdetweil

@dobi

self.sendSocketNotification("DO_YOUR_JOB", this.count)

but u didn’t change this.count to self.count
in all the places

Dobi

@sdetweil I replaced all this. … calls to self. … but I don’t get a change. Is there a way that I can check to check that I can check that the function is loaded correctly from the kernal?

sdetweil

@dobi view the source in the dev window

what u showed above is not changed

Dobi

@sdetweil
sorry I only updated it on github


notificationReceived: function (notification, payload, sender) {
		var self = this;
		switch (notification) {
			case "DOM_OBJECTS_CREATED":
				var timer = setInterval(() => {
					//this.updateDom()
					self.sendSocketNotification("DO_YOUR_JOB", self.count);
					console.log(`self.sendSocketNotification("DO_YOUR_JOB", this.count)`, self.sendSocketNotification("DO_YOUR_JOB", self.count))
					self.sendSocketNotification("DO_YOUR_JOB", self.count)
					self.subElementUp.innerHTML = "Count UP:" + self.count
					self.count++
				}, 1000)
				break
		}
	},

sdetweil

@dobi and in the console.log too

Dobi

@sdetweil Hey sorry for my quite late response. But I wanted to tell you that I found my error it was quite stupid. I had to restart my raspi. After a restart the node_helper worked fine :)
I wrote my first module.

Thanks for your patient