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Polymer webcomponent that detects and notifies changes to the size of its content
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Container element that is aware of, and notifies of, changes to its size.


Sometimes you may need to take some action when the rendered size of an element changes. This element provides the something like the window resize event but for an individual element.

There are many reasons an element's size could change - CSS or class changes, content changes, content of other elements affecting the flow, viewport changes, etc. This element detects the size changes without polling or loops.

This element works in Polymer 2 and Polymer 1 projects. For Polymer 3, see plastic-resize-aware.

This custom control uses code from procurios/ResizeSensor modified to work with Polymer in both Shadow and Shady DOM.


For Polymer 2.0 projects, install the 2.0 native, class based version:

bower install --save resize-aware

For Polymer 1.x projects, install the hybrid version:

bower install --save resize-aware#^1.9.1

For Polymer 3.0 projects, use plastic-resize-aware, and install via:

npm install --save plastic-resize-aware

How to Use

<link rel="import" href="../../bower_components/resize-aware.html" />
<resize-aware on-element-size-changed="handleChange">
    <img src="[[thePic]]">


 any content that could have been in a div
this.$$('resize-aware').addEventListener('element-resize', this.someHandlerName);

Change Notification

You can either include a handler in the markup:

<resize-aware on-element-size-changed="someHandlerName">
  stuff to watch

or listen for the event:

this.$$('resize-aware').addEventListener('element-resize', this.someHandlerName);


MIT license

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