How to get a payload value of a message with a specific topic to show in label of a chart node

[nosered1966]

Hi,
I know that I can use

<font color=#1F51FF size="4">{{msg.payload}}</font>

to display the value of "msg.payload" as text on the dashboard.

But how can I extract the payload value from a specific message (having a specific topic) to use as text for a chart node, which has more than one wire / more than one messages as input?

Thank you and kind regards
Thomas

[jbudd]

@nosered1966

payload ... to use as text for a chart node,

To use as text where in the chart node?

You can dynamically style the chart label

Or you could put a text node above or below the chart.

[nosered1966]

@jbudd Thank you for quick response!
But for dynamically style the chart label I need an additional specific message. I can not directly use the payload of the message (related to you example) you use to draw the red line?

[jbudd]

I can't really imagine the scenario where you would use one of several msg.payloads feeding into a chart node to set the label.

However, I assume you could achieve it something like this
If this msg.payload is the one you want to use, set a flow context variable.
Run all inputs to the chart node through a change node which sets msg.label to that context variable.

[nosered1966]

@jbudd

The scenario is: I have two temperature setpoint values and one actual value shown in one chart node. And I want to see only the text of the actual value in the label of the chart "behind" the name of the chart.
But I think I can mange it using your last example the next days.
Thank you very much for help so far!