Identify the moment when a component is connected or disconnected from the DOM

Transitioning from React to hyperHTML for the sake of performance is my current focus. Utilizing third-party libraries like the dock panel management tools from PhosphorJS has been essential in this process. When implementing the 'DockPanel' class, I encounter the need to connect it to the actual DOM tree.

In React, accomplishing this task can be done through the use of the componentDidMount function (which is called immediately after the virtual nodes are attached to the DOM tree).

My query is whether there exists a method to detect when a component is "mounted" and "unmounted"? While I am aware that HyperElement incorporates the dis/connectedCallback function, it does not seem to work within hyper.Components.

Any insights on this matter would be greatly appreciated!

typescriptdomvirtual-domhyperhtml

Answer №1

The hyperHTML.Component includes both the onconnected and ondisconnected mechanisms, which are detailed in the official documentation.

class Timer extends hyper.Component {
  get initialState() { return {time: new Date()}; }
  onconnected() {
    console.info('Now live');
  }
  render() {
    return this.html`
      <div onconnected=${this} >
        <h1>Greetings, Earth!</h1>
        <h2>The current time is ${
          this.state.time.toLocaleTimeString()
        }.</h2>
      </div>`;
  }
}

I haven't come across PhosphorJS before (it's a new one for me), but as long as it's based on standard DOM elements, you should be good to go.

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