More Chart questions - sorry folks

This is a line chart so you should see the legend when you hover your mouse over the lines of the chart.

Hovering over the lines does bring up the name... sorta. The line that is "in front" shows it's name as expected, but the line 'in the background' acts a bit spotty when hovering over it. Only like 3 out of the 100 points will display a name when I hover over the background line. I'm guessing it would behave the same if I have more than 2 lines as well.

Regardless, hovering and remembering the name as I absorb the chart is not such a good flow. I really do need the legends for more efficient recognition when looking at the charts.

Did you turn on the legend option ?

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:man_facepalming: that was just... bad. Yes I did not see that in there. Thanks!

Hey, we are all allowed to make mistakes.

I am really having a field day with them recently.

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EDIT: I made a new topic for this: click me

I got no suxcess with a chart, using multiple lines. Maybe some can help.
This is what I have:
picture 1
picture 2

var dataArray = [[]];
var seriesArray = []; 
var labelsArray = [""];

for (i=0; i< 5; i++) 
    var name = msg.payload[i].brand + " " + msg.payload[i].place + " " + msg.payload[i].street;
    var preis = msg.payload[i].diesel.toFixed(2);
    var dateTime =;
    var timestamp = Math.floor(dateTime / 1000);

    dataArray[0][i] = {"x":dateTime,"y":preis};
    seriesArray[i] = name;
    //node.send({payload: chart });

var chart = [{

var chartMsg = {payload: chart};
return chartMsg;

Flow needs "Tankerkoenig" + API Id so may be its not so usefull for you:

        "id": "97dfc7db.a3c4d",
        "type": "ui_chart",
        "z": "30b57812.5c8b38",
        "name": "Dieselpreise",
        "group": "107ce709.2e71e1",
        "order": 0,
        "width": "6",
        "height": "6",
        "label": "Diesel",
        "chartType": "line",
        "legend": "true",
        "xformat": "HH:mm:ss",
        "interpolate": "linear",
        "nodata": "Noch keine Daten vorhanden",
        "dot": true,
        "ymin": "1.00",
        "ymax": "2.00",
        "removeOlder": "72",
        "removeOlderPoints": "",
        "removeOlderUnit": "60",
        "cutout": 0,
        "useOneColor": false,
        "colors": [
        "useOldStyle": false,
        "outputs": 1,
        "x": 1530,
        "y": 560,
        "wires": [
        "id": "107ce709.2e71e1",
        "type": "ui_group",
        "z": "",
        "name": "",
        "tab": "7e68b62d.0b5fa",
        "disp": false,
        "width": "6",
        "collapse": false
        "id": "7e68b62d.0b5fa",
        "type": "ui_tab",
        "z": "",
        "name": "",
        "icon": "dashboard",
        "disabled": false,
        "hidden": false

I am unsure whats wrong, since I see no big differences to the working version of @truglodite
The chart should show a line for every entry of seriesArray and add a new entries without deleding the old once.
Thanx for your help!

Would be better to open your own topic, but looking at var dataArray = [[]];
This does not seem correct. it seems to work.

Your y values are strings. Perhaps you can use a parseFloat(msg.payload[i].diesel) instead.

I changed it to float thx. the Problem remains. I ll open a new topic. - Thank you!

Here I go: Problems with chart node (multiple lines)