How to load a <script> src = " " </script> into my mirror?

[nbrenn]

I am trying to have my module load the d3 library to create a table for my csv data. But I am not sure how to type in the line:

src="d3.min.js?v=3.2.8"

(which is wrapped in script brackets), into my module. Right now, nothing shows up on my Mirror aside from the name of the module, datafeed. My code is as follows:

Module.register("datafeed",{
getScripts: function() {
 	return ["d3.min.js"]
 },

 // Define styles.
 getStyles: function() {
 	return ["datafeed_styles.css"];
 },
 

 // Override dom generator.
 getDom: function() {
     d3.text("JANUARY22TEST.csv", function(data) {
             var parsedCSV = d3.csvParseRows(data);

             var container = d3.select("body")
                 .append("table")

                 .selectAll("tr")
                     .data(parsedCSV).enter()
                     .append("tr")

                 .selectAll("td")
                     .data(function(d) { return d; }).enter()
                     .append("td")
                     .text(function(d) { return d; });
         });
 },
});

[morozgrafix]

Here is a snippet from Module Development documentation. Full details are here: https://github.com/MichMich/MagicMirror/tree/master/modules#getscripts

getScripts: function() {
    return [
        'script.js', // will try to load it from the vendor folder, otherwise it will load is from the module folder.
        'moment.js', // this file is available in the vendor folder, so it doesn't need to be available in the module folder.
        this.file('anotherfile.js'), // this file will be loaded straight from the module folder.
        'https://code.jquery.com/jquery-2.2.3.min.js',  // this file will be loaded from the jquery servers.
    ]
}

I would recommend saving it locally in your module directory and loading it from there, because mirror will stall if it can’t access externally hosted file.
Hope this helps.

[nbrenn]

Thanks for your response! I tried to change it to the method you described, but it is still isn’t showing anything. Looking at my code, do you know if there is something else keeping it from working?

I am getting an error that it failed to load resource, on the line of my csv. Do I have to specify the path?

[morozgrafix]

It seems that you are appending table element to the body. If you take a look at HelloWorld sample module you will see a basic structure for getDom method. It needs to return element that will be injected into HTML of the MM when system calls getDom method.

Very basic example would look like this:

getDom: function() {
	var wrapper = document.createElement("div");
	wrapper.innerHTML = "Hello World!";
	return wrapper;
}

When system calls getDom it will get wrapper which would have <div>Hello World!</div> HTML.
If you have a simple CSV file d3 may be an overkill for that, you can probably use a fairly simple javascript to get that done. Here is an example of how you can do it (I didn’t load CSV from external file in that example, I kind of threw it together quickly, but it seems to work): https://jsfiddle.net/morozgrafix/8oz1t9g4/1/

Module development documentation is also pretty good: https://github.com/MichMich/MagicMirror/tree/master/modules
In case your CSV data gets updated while mirror is running, you can also figure out how to periodically update information that you display by looking at other modules.

[nbrenn]

Thanks for the great response. Your example is very helpful.

I would like to update the CSV while the mirror is running, so I will have to look in to how to accomplsh that.

One question about loading the CSV, if I were to use your example. In your example, you are reading the CSV data from a text area. In my case, how would I read the CSV from a directory on my Raspberry Pi? It looks like I would have to access the file and then save it as the object “csvData”.

It also looks like I am receiving a “http://localhost:8080/home/pi/MagicMirror/modules/datafeed/JANUARY22TEST.csv Failed to load resource: the server responded with a status of 404 (Not Found)” error. The connection to port 8080 is refused (and my mirror is running on Port 8080 and all of my other modules are running fine). Do you know a workaround for this?

Thank you!

[morozgrafix]

Sorry I’m on mobile right now and it’s not easy to write code samples on the phone.

You will not be able to access your local file via URL like that. You would need to read it from the file system. In default compliments module there is a piece of code that you can modify to achieve that.

EDIT: If you place your JANUARY22TEST.csv file in the directory of your module named datafeed it should be available at this URL: http://localhost:8080/modules/datafeed/JANUARY22TEST.csv

Here is a snippet, but I would recommend looking through the whole module to get a better idea how it works:

	/* complimentFile(callback)
	 * Retrieve a file from the local filesystem
	 */
	complimentFile: function(callback) {
		var xobj = new XMLHttpRequest();
		xobj.overrideMimeType("application/json");
		xobj.open("GET", this.file(this.config.remoteFile), true);
		xobj.onreadystatechange = function () {
			if (xobj.readyState == 4 && xobj.status == "200") {
				callback(xobj.responseText);
			}
		};
		xobj.send(null);
	},

In this case it’s reading JSON file, but you would need to read plain text CSV. There are a few examples that are similar on Stack Overflow and in tutorials online. I will try to dig up an example when I’m back in front of my computer, but I’m sure you can easily search for them.

[nbrenn]

@morozgrafix Thanks for the response and the support!

This looks very promising solution and I’ll give it a go once I solve one nagging problem. I am receiving the connection refused error when I am connecting to the localhost: 8080:

pi@raspberrypi:~ $ wget --verbose localhost:8080
--2017-01-24 12:11:12--  http://localhost:8080/
Resolving localhost (localhost)... ::1, 127.0.0.1
Connecting to localhost (localhost)|::1|:8080... failed: Connection refused.
Connecting to localhost (localhost)|127.0.0.1|:8080... failed: Connection refused.
pi@raspberrypi:~ $

[morozgrafix]

@nbrenn is your mirror up and running with npm start or node serveronly? If webserver isn’t running on port 8080 you will get connection refused error when attempting to access it over HTTP.

[nbrenn]

@morozgrafix I start my mirror with npm start. And my Mirror config.js, I am using Port 8080.

[morozgrafix]

@nbrenn when your electron MM app shows up on the screen and while it is running, you should be able to do wget http://localhost:8080 without getting connection refused.