Chart update not working

Dashboard
1

Hello I have trouble with showing values on chart. Chart is empty. I run out of ideas.

Point is one of 3000. y value goes to 10 and x value is time from 0:0:0 to 23:59:59

{"x":"14:46:48","y":0}

image
image471×798 18.9 KB

2

Please indicate via the thread's tags whether this is for Dashboard 1 or 2. Thanks.

3

@Sekuti's screen capture shows Class and Name at the bottom of the popup, thus it's the original, node-red-dashboard.

The original dashboard is picky about it's input data structure.
Can you capture the entire message payload (using a Write file node?), edit it, deleting about 2995 of the 3000 data points before sharing it here?

4

[{"labels":["01"],
"series":["2-Izmena"],
"data":[[{"x":"13:18:11","y":11.1},{"x":"13:18:18","y":11.38},{"x":"13:18:28","y":10.75},{"x":"13:18:38","y":10.74},{"x":"13:18:48","y":10.68},{"x":"13:18:58","y":10.87},{"x":"13:19:8","y":10.41},{"x":"13:19:18","y":10.68}]]}]

5

Problem now is that x scale always starts with current hour and offcourse chart is empty

6

I suspect the chart node cannot understand your x value strings "hh:mm:ss".

Specify your x values as either a javascript timestamp or Date object rather than a string.

7

[{"labels":["01"],"series":["2-Izmena"],"data":[[{"x":"2026-2-16","y":44.45},{"x":"2026-2-17","y":93.49},{"x":"2026-2-18","y":79.38}]]}]
[{"labels":["01"],"series":["2-Izmena"],"data":[[{"x":"13:18:11","y":11.1},{"x":"13:18:18","y":11.38},{"x":"13:18:28","y":10.75}]]}]

8

upper post represents two data. One is working and other not. The only diferent is that for one I use year-Month-Date and on the other HH:mm:ss

9

This data works for me, after sending an empty array to clear the chart.

[
    {
        "labels": [
            "01"
        ],
        "series": [
            "2-Izmena"
        ],
        "data": [
            [
                {
                    "x": "2026-02-18T13:18:11",
                    "y": 11.1
                },
                {
                    "x": "2026-02-18T13:18:18",
                    "y": 11.38
                },
                {
                    "x": "2026-02-18T13:18:28",
                    "y": 10.75
                },
                {
                    "x": "2026-02-18T13:18:38",
                    "y": 10.74
                },
                {
                    "x": "2026-02-18T13:18:48",
                    "y": 10.68
                },
                {
                    "x": "2026-02-18T13:18:58",
                    "y": 10.87
                },
                {
                    "x": "2026-02-18T13:19:08",
                    "y": 10.41
                },
                {
                    "x": "2026-02-18T13:19:18",
                    "y": 10.68
                }
            ]
        ]
    }
]

I (arbitrarily) made each of your hh:mm:ss values into a datetime for yesterday.
I also tweeked the "13:19:8" value to "13:19:08"

The chart can understand your data eg "2026-2-15" (as midnight on the given date).

I believe that a javascript timestamp is a better option than a date time string.