I am interested in dynamically importing elements using the
Polymer.import( elements, callback )My query is: Is there a conventional method to determine if a Polymer element has been successfully loaded?
When an element is not registered, it is treated as a standard HTMLElement.
To check elements, you can use the following method:
<!-- IN HEAD: core-pages would be loaded -->
<link href="core-pages/core-pages.html" rel="import">
...
<!-- IN BODY: core-animated-pages would NOT be loaded -->
<core-pages id='reg'></core-pages>
<core-animated-pages id='unreg'></core-animated-pages>
...
<script>
document.addEventListener('polymer-ready', function(e) {
/* will print false ⇒ registered */
console.log(document.getElementById('reg').constructor === HTMLElement);
/* will print true ⇒ unregistered */
console.log(document.getElementById('unreg').constructor === HTMLElement);
});
</script>
Check out the live example here: http://plnkr.co/edit/uqxn6RlBXZ3746AhTnON?p=preview
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