Perspective component get dropdown props from gateway

Module Development
1

Hi,

I want to create a perspective component with a input_datapoint_id property which a list of items will be provided as dropdown to select a single value.

If my dropdown list is fixed I can do this

{
  "type": "object",
  "additionalProperties": false,
  "required": [],
  "properties": {
    "input_datapoint_id": {
      "type": "string",
      "enum": ["one", "two", "three"],
      "description": "Input datapoint id of production loss",
      "default": "one"
    },
  }
}

However, What if the dropdown list should be generated dynamically (ideally a query to the gateway would work but how can this be done?), will it be possible to have a dynamic dropdown list for the props of a perspective component?

2

I've never used it, but apparently this exists:

3

Cool I'll try that out.

How about if I want to get data from the gateway to populate the dropdown within the component.

Is it possible to do an api call to the gateway to get such data?

4

Seems like an anti-pattern. Components are best when they’re flexible, and making a component do its own queries is at odds with the goals of Ignition. Is there a reason you don’t want to provide your options through a binding?

5

It's quite a custom component that I am building and I want to abstract away as much things as possible

6

If you insist.

I’d handle fetching the data in your ComponentModelDelegate and send it the client via an event. You could do this when the delegate starts, on some interval, and/or when the client requests a refresh through a message.