Chart help please.

[shykitten55]

Setting up a Chart is fairly easy.

I have most of what I want to happen happening, but I'm wondering if this is possible:

In the graph's settings there is a field which you enter text, and before any data arrives, this text is shown.

This is handy for THE first time before data arrives to see that is true.

But subsequent attempts fail to get that text back.

Is there a way that if/when data stops arriving, a message (text) can be shown as per the afore mentioned?

I've tried setting the field to {{msg.topic}} and sending a packet with the msg.topic = "TEST" and nothing happens.

Thanks in advance.

[shykitten55]

(sorry, should have posted this with the original post)

This is the example flow - which doesn't work.

[{"id":"5c230b5a.cb1d74","type":"debug","z":"2d44537.f26082c","name":"Topic","active":true,"tosidebar":true,"console":false,"tostatus":false,"complete":"topic","x":500,"y":930,"wires":[]},{"id":"fc7d360c.71206","type":"function","z":"2d44537.f26082c","name":"","func":"msg.topic = \"No Comms\";\nreturn msg;","outputs":1,"noerr":0,"x":360,"y":890,"wires":[["551f28b2.981e9","5c230b5a.cb1d74","6e7816b7.6e8ad"]]},{"id":"5e830479.30b914","type":"inject","z":"2d44537.f26082c","name":"","topic":"","payload":"0","payloadType":"num","repeat":"","crontab":"","once":false,"onceDelay":0.1,"x":190,"y":890,"wires":[["fc7d360c.71206"]]}]

[Dave C-J]

the text it there when there is no data... so to get back to no data you need to send a payload containing and empty array    

    msg.payload = [];

[shykitten55]

Thanks.

Honestly I don't know why, but I tried that and it "didn't work" but now when I tried it after you said it:  it worked.

Go figure.