Welcome to OGeek Q&A Community for programmer and developer-Open, Learning and Share
Welcome To Ask or Share your Answers For Others

Categories

0 votes
128 views
in Technique[技术] by (71.8m points)

javascript - 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.

See Question&Answers more detail:os

与恶龙缠斗过久,自身亦成为恶龙;凝视深渊过久,深渊将回以凝视…
Welcome To Ask or Share your Answers For Others

1 Reply

0 votes
by (71.8m points)

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.


与恶龙缠斗过久,自身亦成为恶龙;凝视深渊过久,深渊将回以凝视…
OGeek|极客中国-欢迎来到极客的世界,一个免费开放的程序员编程交流平台!开放,进步,分享!让技术改变生活,让极客改变未来! Welcome to OGeek Q&A Community for programmer and developer-Open, Learning and Share
Click Here to Ask a Question

...