owl/doc/reference/utils.md

🦉 Utils 🦉

Owl export a few useful utility functions, to help with common issues. Those functions are all available in the owl.utils namespace.

Content

• whenReady: executing code when DOM is ready
• loadFile: loading a file (useful for templates)
• EventBus: a simple EventBus

whenReady

The function whenReady returns a Promise resolved when the DOM is ready (if not ready yet, resolved directly otherwise). If called with a callback as argument, it executes it as soon as the DOM ready (or directly).

const { whenReady } = owl;

await whenReady();
// do something

or alternatively:

whenReady(function () {
  // do something
});

loadFile

loadFile is a helper function to fetch a file. It simply performs a GET request and returns the resulting string in a promise. The initial usecase for this function is to load a template file. For example:

const { loadFile } = owl;

async function makeEnv() {
  const templates = await loadFile("templates.xml");
  // do something
}

EventBus

It is a simple EventBus, with the same API as usual DOM elements, and an additional trigger method to dispatch events:

const bus = new EventBus();
bus.addEventListener("event", () => console.log("something happened"));

bus.trigger("event"); // 'something happened' is logged