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Javascript within Polymer (not targeting the right way)

Asked By: Anonymous

So I just started using Polymer, I want to build a custom SoundCloud player in this element. Somehow I keep getting following error:

Uncaught Error: SC.Widget function should be given either iframe
element or a string specifying id attribute of iframe element.

That should mean I am not targeting the iframe the right way, but I can’t think of another way to do so (since almost 4 hours).

= My problem is why var iframe = $(".iframe"); doesn’t target the iframe. I tried it outside of Polymer and it worked fine there.

breaker-stream.html:

<polymer-element name="breaker-stream" attributes="url">
    <template>
    <a href="http://url">http://url</a>
      <script>   
        var iframe = $(".iframe");
        var widget = SC.Widget(iframe);
      </script>
  </template>
  <script>
    Polymer('breaker-stream', {
        url: ""
    });
  </script>
  <a href="http://ajax.googleapis.com/ajax/libs/jquery/1/jquery.min.js">http://ajax.googleapis.com/ajax/libs/jquery/1/jquery.min.js</a>
  <a href="https://w.soundcloud.com/player/api.js">https://w.soundcloud.com/player/api.js</a> 
</polymer-element>

Solution

Answered By: Anonymous
  1. You cannot use jquery $ to access elements inside a shadow-root the same way you do in the main document. This is well-documented, try searching.
  2. Putting <script> tags inside your template is a bad idea, put element-script inside the prototype object (inside Polymer()).
  3. It’s also a bad idea to put <script> inside of <polymer-element>. They don’t do anything special when put there, and should be outside that element instead.

Here is a working example (http://jsbin.com/xujole/4/edit):

<!DOCTYPE html>
<html>
<head>
<meta charset=utf-8>
<title>Polymer</title>

  <!-- web components polyfill for non-Chrome -->
  <script src="//www.polymer-project.org/components/platform/platform.js"></script>

</head>
<body>

  <breaker-stream url="http://api.soundcloud.com/users/1539950/favorites"></breaker-stream>

  <!-- from here down could be in an import -->

  <!-- need this to make Polymer elements -->
  <link rel="import" href="//www.polymer-project.org/components/polymer/polymer.html">
  <!-- don't load this twice -->
  <a href="https://w.soundcloud.com/player/api.js">https://w.soundcloud.com/player/api.js</a> 

  <polymer-element name="breaker-stream" attributes="url" block>
  <template>
    <a href="https://w.soundcloud.com/player/?url=url">https://w.soundcloud.com/player/?url=url</a>
  </template>
  <script>
    Polymer({
      url: "",
      ready: function() {
        this.widget = SC.Widget(this.$.frame);
      }
    });
  </script>
  </polymer-element>

</body>
</html>

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