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ReferenceError: KeyframeEffect is not defined in paper component

I am creating a web application and for the dropdown I am using paper-dropdown-menu My code has remained simple and follows the demo closely here

Here's a snippet of code:

<link rel="import" href="/polymer/polymer-element.html">
<link rel="import" href="/paper-dropdown-menu/paper-dropdown-menu.html">
<link rel="import" href="/paper-item/paper-icon-item.html">
<link rel="import" href="/paper-listbox/paper-listbox.html">
<link rel="import" href="/iron-icons/maps-icons.html">

<dom-module id="isochrone-settings-element">
    <template>
     ...

        <div id="settings">
            <paper-dropdown-menu label="Travel mode">
                <paper-listbox slot="dropdown-content" attr-for-selected="value" selected={{selectedItem}}>
                    <paper-icon-item value="auto">
                        <iron-icon icon="maps:directions-car" slot="item-icon"></iron-icon>Driving
                    </paper-icon-item >
                    <paper-icon-item value="bicycle">
                        <iron-icon icon="maps:directions-bike" slot="item-icon"></iron-icon>Cycling
                    </paper-icon-item>
                    <paper-icon-item value="bus">
                        <iron-icon icon="maps:directions-bus" slot="item-icon"></iron-icon>Bus
                    </paper-icon-item>
                    <paper-icon-item value="pedestrian">
                        <iron-icon icon="maps:directions-walk" slot="item-icon"></iron-icon>Walking
                    </paper-icon-item>
                </paper-listbox>                
         </paper-dropdown-menu>
       </div>

    </template>
    .....

   </dom-module>

The thing is, when I try to use the dropdown in a webapp, I get the following error:

neon-animation-runner-behavior.html:40 Couldnt play ( fade-in-animation ). ReferenceError: KeyframeEffect is not defined
    at HTMLElement.configure (fade-in-animation.html:39)
    at HTMLElement._configureAnimations (neon-animation-runner-behavior.html:33)
    at HTMLElement.playAnimation (neon-animation-runner-behavior.html:93)
    at HTMLElement._renderOpened (iron-dropdown.html:233)
    at HTMLElement.__openedChanged (iron-overlay-behavior.html:541)
    at nextAnimationFrame (iron-overlay-behavior.html:566)

The same error occurs at least 3 times every time I use the menu.

Now I am looking at the component itself, but since I haven't found many problems that look relevant on the web, I think the problem might come from me.

Is there something clearly wrong with this snippet?

thank

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2 answers


You need to enable polyfill for WebAnimation API. The animation you are trying to use is only available in Chrome Canary. Just add:

<link rel="import" href="../../neon-animation/web-animations.html">



The reserved line in the source code can be found here.

And here you will get updates if you need to enable these changes

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You will need to import neo-animation and web-animation-js

bower install --save PolymerElements/neon-animation
bower install --save web-animations-js


Then enable imports:

<link rel="import" href="../bower_components/neon-animation/web-animations.html">
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