Fetch Backend Data in Foreground

Developing Nodes
1

Hi,

I like to fetch an environment variable in oneditsave() and wonder if this is possible. I think that the problem is, that we're on the browser, but need to get data from the NR-flow.

Something like:

//...
oneditsave: function () {
	// ...
	const e = $env.get('VARIABLE');
	// ...
}

Is there a straightforward way?

2

You can add an admin endpoint in node-red (server-side) (in the JS) and call it from the front end (in the html script).

Look at the source for the serial node (and others) that already do this.

3

I'm on my lunch, so dropping by...

To enforce the above by @Steve-Mcl, here is what I do for my z-wave module:
Here is an http endpoint, that returns serial ports :

Then in my node html (oneditprepare)

1 Like
4

uibuilder also has several examples and they are broken out into separate functions for convenience along with error handling and user-notification where needed.

5

Cool, works like charm. A little bit painful to search all these source code for solutions. :wink:

6

Maybe fresh eyes could document it and submit a PR against the node-red docs? :wink:

1 Like
7

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