MMM-MealViewer

[htilburgs]

@cowboysdude, I’m looking for the part where you “change” the XML data to JSON data. I’m trying to write a new MMM, but the data is presented in XML. I like the have it in JSON, so I can use it.

Maybe I read over it, but I cannot figure out where you do this.

[sdetweil]

@htilburgs there are a few xml to json modules

https://www.npmjs.com/package/xml2js

google search
‘nodejs xmltojson’

here is one with a just code, no extra libs

https://davidwalsh.name/convert-xml-json

[htilburgs]

@sdetweil , I’ve found them, but I don’t know how to use it in combination with the URL that creates the XML.

Indeed the last one with no extra libs looks promising. I tried to simply add this in the node_helper.js but getting stuck at how to use it.
I’ve looked into all the MMM Modules but cannot seem to find an example.

[sdetweil]

@htilburgs the url bring back the data with request

request(url, function(err, res, body) {
    // if no error and server was happy
    if(err == null && res.statusCode ==200){
    console.log(body);
    var json_data=this.xmlToJson(body)
    console.log("Speed[0] text is "+json_data.SD[0].SPEED.@attributes.TEXT)
}
});

when the server responds, the function is called and passed the data, body)
and then u would convert it from xml to json . using the last code

var json_data=this.xmlToJson(body)

then the json is accessed with the normal structure notation
(using the sample with the code in the last link)

json_data.SD[0].SPEED.@attributes.TEXT will be ‘1421’

SD is an array (multiple of same xml tags)

a little ugly in the data layour, could get rid of the @attributes thing with a small code change

[htilburgs]

So in my case the URL produces:

image url)

json_data.SD[0].SPEED@attributes.TEXT will be:

json.data.film[0].titel    --> 'Bellicher: Cel'

Correct?

[sdetweil]

@htilburgs correct (json_data is the name of the output variable, note underscore, not dot, using dot means ‘go into’) … if you use one of the module add ons… not the code shown…

[sdetweil]

@htilburgs and the number of films in the array would be

json_data.film.length

using the developers window you can put a code stop on the line after the xml2json
and then u can explore the conversion…

you can also use console.log(JSON.stringify(some_object)) and it will dump the structure in json format

[htilburgs]

Mmmm… not working yet…
My current node_helper.js:

const NodeHelper = require('node_helper');
const request = require('request');

module.exports = NodeHelper.create({

    start: function() {
        console.log("Starting node_helper for: " + this.name);
    },
	
	// Changes XML to JSON
	xmlToJson: function(xml) {
		
		// Create the return object
		var obj = {};

		if (xml.nodeType == 1) { // element
			// do attributes
			if (xml.attributes.length > 0) {
			obj["@attributes"] = {};
				for (var j = 0; j < xml.attributes.length; j++) {
					var attribute = xml.attributes.item(j);
					obj["@attributes"][attribute.nodeName] = attribute.nodeValue;
				}
			}
		} else if (xml.nodeType == 3) { // text
			obj = xml.nodeValue;
		}

		// do children
		if (xml.hasChildNodes()) {
			for(var i = 0; i < xml.childNodes.length; i++) {
				var item = xml.childNodes.item(i);
				var nodeName = item.nodeName;
				if (typeof(obj[nodeName]) == "undefined") {
					obj[nodeName] = xmlToJson(item);
				} else {
					if (typeof(obj[nodeName].push) == "undefined") {
						var old = obj[nodeName];
						obj[nodeName] = [];
						obj[nodeName].push(old);
					}
					obj[nodeName].push(xmlToJson(item));
				}
			}
		}
		return obj;
	},
		
	
	getMTVM: function(url) {
		request(url, function(err, res, body) {
		// if no error and server was happy
			if(err == null && res.statusCode ==200){
			console.log(body);
			var json_data = this.xmlToJson(body)
			console.log("Text is " + json_data.film[0].titel)
			}
		});
	},


    socketNotificationReceived: function(notification, payload) {
        if (notification === 'GET_MTVM') {
            this.getMTVM(payload);
        }
    }
});

In the dev console I get an error:

Whoops! There was an uncaught exception...
TypeError: this.xmlToJson is not a function

[sdetweil]

@htilburgs ah the fun of ‘this’…

	getMTVM: function(url) {
               let self=this
		request(url, function(err, res, body) {
		        // if no error and server was happy
			if(err == null && res.statusCode ==200){
			   console.log(body);
			   var json_data = self.xmlToJson(body)
			   console.log("Text is " + json_data.film[0].titel)
			}
		});
	},

[htilburgs]

@sdetweil Yeah! That part is working. Now I’ve an other error which has something to do with the xmlToJson function:

Whoops! There was an uncaught exception...
TypeError: xml.hasChildNodes is not a function

Any idea?