ov-downlink

src/ov-downlink.js

A STILL OF demo/downlink.html

Attributes

Properties

None that can be set. See the read-only properties below.

READ-ONLY PROPERTIES

report

Events

Using it

import 'overscan'
import 'overscan/overscan.css'

<ov-downlink
  id="doc-downlink"
  label="ROCINANTE"
  lines="4"
  style="inline-size:320px;max-inline-size:100%"
>
</ov-downlink>
<script type="module">
  customElements.whenDefined('ov-downlink').then(() => {
    const link = document.getElementById('doc-downlink');
    link.receive({ text: 'BURN COMPLETE, COASTING', age: 212 });
    link.receive({ text: 'TIGHTBEAM ALIGNED', age: 206 });
    link.receive({ text: 'RELAYED, NO TIMESTAMP' });
    link.receive({ text: 'CREW NOMINAL', age: 200 });
  });
</script>

import { OvDownlink } from 'overscan/react'

<OvDownlink
  id="doc-downlink"
  label="ROCINANTE"
  lines="4"
  onSignal={handler}
/>

import { OvDownlink } from 'overscan/vue'

<OvDownlink
  id="doc-downlink"
  label="ROCINANTE"
  lines="4"
  @signal="handler"
/>

import OvDownlink from 'overscan/svelte/OvDownlink.svelte'

<OvDownlink
  id="doc-downlink"
  label="ROCINANTE"
  lines="4"
  onsignal={handler}
/>

The CSS is a separate import in every framework. A single element can be imported on its own instead of the whole kit: import 'overscan/src/ov-chart.js'

A reading is set as a PROPERTY, never an attribute. An attribute is a string, so an array cannot survive one and a null arrives as the word "null", which the protocol would read as a value rather than a dropout.

Every ov: event is bound with addEventListener. The colon has no declarative spelling in Svelte 5, where the on: directive is gone and "onov:commit" is not an identifier, nor in JSX. Vue can bind it.

The wrapper applies attributes ITSELF and hands the framework nothing but a ref. All three frameworks set a prop as a property when the name exists on the element, and this kit has 77 getter-only properties across 43 elements. Assigning one throws, and in React it does not degrade: the whole tree fails to render. 13 elements have a getter-only name that is also a real attribute (at, bearing, digits, duration, floor, fov, fresh, hold, lat, lon, period, pitch, range, ring, rings, span, step, sweep, sweeps, traces, value), which are the ones a reader would naturally pass in markup.