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Dart: Scalable Application Development by Ivo Balbaert, Sergey Akopkokhyants, Davy Mitchell

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Extending DOM elements

Instead of making a new Polymer component from scratch, as we did in the previous recipes, you can also start from a native HTML element and build upon that. This is made possible because our component is backed up by a class that can inherit the properties and behavior of an existing HTML element class. For our example, we will extend a Div element. You can find the code in the project dom_extend.

How to do it...

  1. The script starts with web\index.html, where a component with the name dom-extend is imported through the following line:
    <link rel="import"href="dom_extend.html">

    From this, we know that the component is defined in dom_extend.html, and the code behind it is in a file named dom_extend.dart. For a discussion of the ...

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