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Does Polymer fire() publish the event globally?

Asked By: Anonymous

Suppose the following is called from within a Polymer element:

this.fire("reset-counters");.

Will the reset-counters event be published to all elements that listen for that event or is in heard within the element that called this.fire() only?


Solution

Answered By: Anonymous

By default this.fire() raises a bubbling even which will be handled by all elements up the DOM tree. Like most events in the browser.

Polymer does however offer an API similar to the native events API, The fire method takes three parameters: event name, details object and options object. In options, set bubbles: false to forbid the event from being pushed up the DOM tree.

See the example below to see how only the immediate listener fires when you click the second button.

_x000D_

_x000D_

Polymer({_x000D_
  is: 'my-elem',_x000D_
  bubbling: function() {_x000D_
    this.fire('my-event', 'bubbling');_x000D_
  },_x000D_
  nonbubbling: function() {_x000D_
    this.fire('my-event', 'nonbubbling', {_x000D_
      bubbles: false_x000D_
    });_x000D_
  }_x000D_
});

_x000D_

<!DOCTYPE html>_x000D_
<html>_x000D_
<head>_x000D_
  <base href="https://polygit.org/components/">_x000D_
  <a href="http://webcomponentsjs/webcomponents-lite.min.js">http://webcomponentsjs/webcomponents-lite.min.js</a>_x000D_
  <link href="polymer/polymer.html" rel="import"/>_x000D_
</head>_x000D_
_x000D_
<body>_x000D_
  <div>_x000D_
    <my-elem></my-elem>_x000D_
  </div>_x000D_
  _x000D_
  <dom-module id="my-elem">_x000D_
    <template>_x000D_
      <input type="button" value="fire bubbling" on-tap="bubbling" />_x000D_
      <input type="button" value="fire non-bubbling" on-tap="nonbubbling" />_x000D_
    </template>_x000D_
  </dom-module>_x000D_
  _x000D_
  <script>_x000D_
    document.querySelector('my-elem')_x000D_
      .addEventListener('my-event', handle('my-elem'));_x000D_
    _x000D_
    document.querySelector('div')_x000D_
      .addEventListener('my-event', handle('div'));_x000D_
    _x000D_
    document_x000D_
      .addEventListener('my-event', handle('document'));_x000D_
    _x000D_
    function handle(elem) {_x000D_
      return function(e) {_x000D_
        console.log(e.detail + ' handled on ' + elem);_x000D_
      };_x000D_
    }_x000D_
  </script>_x000D_
_x000D_
</body>_x000D_
</html>

_x000D_

_x000D_

x000D

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