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how to access ShadowDOM of other polymer elements?

Asked By: Anonymous

I’m learning Dart by making a simple webapp. the app ui I have in mind has two parts, one is a control panel, the other is a workspace. by clicking buttons in the control panel, user should be able to control the workspace.

both the control panel and the workspace are custom polymer elements. In the Control Panel’s dart class, I can access itself by using shadowRoot.querySelector, but since the control panel needs to control the workspace, I need to access the workspace also. but I don’t know how to do that. I tried querySelector for example, It gave me null. I understand it is a shadow DOM in the workspace tag, but how to access other tags’ shadow DOM?

I can’t find anything online, every example and document seems to only use shadowRoot to access self elements.


Answered By: Anonymous

It is difficult to access the shadow DOM of another element, and this is by design. Instead of having your two custom elements so tightly coupled, a better approach would be to use events or signals. Your control panel element should take user input and fire appropriate events using the convenient fire() method it inherits from the PolymerElement class. Your application can catch and then relay those events to your workspace element. If that seems overly circuitous, you can use Polymer’s <core-signals> element to pass events without dealing with intermediaries.

As an example, inside your control panel element, you might have a bold button.

<button on-click="{{boldClicked}}">Bold</button>

When that button is clicked, the control panel’s boldClicked() method is executed in response. It might look something like this:

void boldClicked(Event event, var detail, Element target) {
fire('core-signal', detail: {'name': 'bold', 'data': null});

Then in your workspace element’s HTML file, you might have:

<core-signals on-core-signal-bold="{{boldEventReceived}}"></core-signals>

And finally, in your workspace element’s Dart class would be a method like so:

void boldEventReceived(Event event, var detail, Element sender) {
// manipulate workspace shadow DOM here

This is just one of several ways to accomplish this. You can look over the Dart team’s <core-signals> example for more.

And of course, if you’re using Polymer to its full potential, you will find that you need to do very little manual DOM manipulation. Using data binding and data-driven views is a winning strategy.

techinplanet staff

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