javascript - Listening global window events in stencilJS - Stack Overflow

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Let's say that I have something like this somewhere in application:

var event = new Event('build');
window.dispatchEvent(event);

In stencilJS documentation, they say that you can listen to global events like this:

@Listen('body:scroll')
handleScroll(ev) {
    console.log('the body was scrolled', ev);
}

But I couldn't find way to listen to event that is emitted on window, like I can listen it with plain Javascript:

window.addEventListener('build', function (e) { 
  console.log('Event happened',e);
}, false);

Any ideas?

Let's say that I have something like this somewhere in application:

var event = new Event('build');
window.dispatchEvent(event);

In stencilJS documentation, they say that you can listen to global events like this:

@Listen('body:scroll')
handleScroll(ev) {
    console.log('the body was scrolled', ev);
}

But I couldn't find way to listen to event that is emitted on window, like I can listen it with plain Javascript:

window.addEventListener('build', function (e) { 
  console.log('Event happened',e);
}, false);

Any ideas?

• javascript
• dom-events
• stenciljs

Share Improve this question Follow edited Nov 2, 2019 at 21:51 Brian Tompsett - 汤莱恩 5,8937272 gold badges6161 silver badges133133 bronze badges asked Nov 20, 2017 at 16:57 Dragan MalinovicDragan Malinovic 60266 silver badges1313 bronze badges

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3 Answers 3

Sorted by: Reset to default 4

I tried the stencil docs example and it did not work. I then changed the 'body' to 'window' and now I see the scroll event in the console.

@Listen('window:scroll')
handleScroll(ev) {
  console.log('the body was scrolled', ev);
}

import { Listen } from '@stencil/core';

@Listen('scroll', { target: 'window' })
handleScroll(ev) {
  console.log('the body was scrolled', ev);
}

Official documentation : https://stenciljs./docs/events

Ok, so i did a example of listening to a ponents published event in this blog post.

But here is the general solution. I would use Stencils Event Emitter and emit from a ponent. Lets say you do this and emit an event from your ponent called fancyEvent...

@Event() fancyEvent: EventEmitter;
...
this.fancyEvent.emit($event);

To listen to this event on the window (i.e. in index.js), you can do one of two things. If you have a transpiler such as typescript, you can listen like this

@Listen('fancyEvent')
function doSomethingFancy() {}

But in vanilla es5 style javascript you can also listen to these custom events like this.

window.addEventListener('fancyEvent', function(e) {})

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