Polymer and WebComponentsReady event
According to the Polymer docs, the WebComponentsReady event is necessary because...
The polyfills parse element definitions and handle their upgrade asynchronously. If you prematurely fetch the element from the DOM before it has a chance to upgrade, you’ll be working with an HTMLUnknownElement. In these situations, wait for the WebComponentsReady event before interacting with the element
I have an HTML page that imports a single web component and registers a handler that logs a statement when all web components are loaded:
<!DOCTYPE html>
<html>
<head>
<script src="bower_components/platform/platform.js"></script>
<link rel="import" href="elements/my-element.html">
</head>
<body unresolved>
<my-element></my-element>
<script>
window.addEventListener('WebComponentsReady', function(e) {
console.log('components ready');
});
</script>
</body>
</html>
Why is the WebComponentsReady event firing before my-element's ready polymer event? I need to know when I can interact with the custom element, e.g. change its properties and call its public methods.
Answer
In Polymer 1.0 you can just listen for WebComponentsReady.
In Polymer 0.5, because it does more things asynchronously, there's an extra event called polymer-ready which will fire when your elements are loaded. Here's a jsbin showing the order.