Hello I have the data in the attached screenshot parsed from an AWS DynamoDB. I've tried to extract parts of the payload to feed into a UI chart (in this function I am trying to plot temperature vs time). [query] The function code is as follows: var x=0; var data = {}; var i=0; for (i=0; i< ms…

There is a link in the info panel for the Chart node that tells you how to pre-format data to be passed in as a complete chart.

thank you for that information I've tried to feed the data in as per the flow example on node-red/node-red-dashboard/blob/master/Charts.md#stored-data # Node-RED-Dashboard Charts ## Live data To display live data just wire up an input with a `msg.payload` that contains a number. ### L…

[image] Sirhc: objectdata = {"x":msg.payload.Items[i].time, "y":msg.payload.Items[i].payload.M.Temperature}; Looking at the most obvious problem you can see that x and y in the result are not numbers. In the debug showing your source data expand those two elements (time and Temperature) and …

Thanks for that! So I now have my flow injecting the following data into a chart node (you can see the data on the right). But I cannot get it to chart. Any ideas why? [asdsdfsdf]

It is a pity that the example in the docs has three series but also three points for each series so it is not entirely clear whether the data array contains one element for each series, and each of those elements contains the data points for that series, or whether the data array contains one elemen…

I think it's because I am parsing the values as strings instead of numbers...

Ah, you could be right. In that case use "x": Number(msg.payload.items...)

Yep - I just wrote that as you responded! Works a treat now, except the EPOCH time in the x value is not being converted correctly on the chart. Does node-red conver that time to a normal readable time ?[time] The first point pased is: x: 1552215913 (converts to Sunday March 10, 2019 22:05:13 (pm…

If you look again at the example in the docs you will see that the timestamps should be javascript time (which is milliseconds), so the first thing to do is to multiply all your timestamps by 1000.

Developing UI chart from an array

General

Sirhc 12 March 2019 11:50 14

One more issue I'm having, the points all display correctly on the chart, but the X-axis does not reflect the points ?

Is there a setting on the chart somewhere to ensure this adjusts to the time stamps I am plotting?

query

Topic		Replies	Views
Help with sending an array to a chart General	16	2865	28 September 2021
Problem in Chart sensor data General	8	1266	30 May 2020
Display datas from influx in an UI-Chart Dashboard	42	3967	6 February 2021
Graph with stored data Dashboard	29	5890	26 October 2020
Dashboard 2 - best format to use for timeseries data Dashboard dashboard-2	30	723	12 December 2023

Developing UI chart from an array

Related topics