overriding-an-inherited-method.html

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<!--
# Overriding a extendee element method

Shows how to use and extend a extendee element method from the extender
element.

Use `this.super()` in the extender element to invoke a extendee element
method:

    <polymer-element name="extendee-element" attributes="message">
      ...
      <script>
        Polymer({
          setMessage: function() {
            this.message = 'I like Ike';
          }
        });
      </script>
    </polymer-element>

    <polymer-element name="extender-element" extends="extendee-element">
      ...
      <script>
        Polymer({
          setMessage: function() {
            this.super();
            this.message += ', but I love Lucy.';
          }
        });
      </script>
    </polymer-element>

Note: While this sample does not use this feature, you can optionally pass a
list of arguments to `super()`. See the
[official docs](https://www.polymer-project.org/docs/polymer/polymer.html#overriding-a-parents-methods).

[jsbin](http://jsbin.com/raqoj/edit)
-->

<link rel="import" href="../../components/polymer/polymer.html">

<polymer-element name="extendee-element" attributes="message">
  <template>
    <div>{{message}}</div>
    <button on-tap="{{setMessage}}">Show Message</button>
  </template>
  <script>
    Polymer({
      setMessage: function() {
        this.message = 'I like Ike';
      }
    });
  </script>
</polymer-element>

<polymer-element name="extender-element" extends="extendee-element">
  <template>
    <shadow></shadow>
  </template>
  <script>
    Polymer({
      setMessage: function() {
        this.super();
        this.message += ', but I love Lucy.';
      }
    });
  </script>
</polymer-element>