windows 10 pro office 2019 pro office 365 pro windows 10 home windows 10 enterprise office 2019 home and business office 2016 pro windows 10 education visio 2019 microsoft project 2019 microsoft project 2016 visio professional 2016 windows server 2012 windows server 2016 windows server 2019 Betriebssysteme office software windows server https://softhier.com/ instagram takipçi instagram beğeni instagram görüntüleme instagram otomatik beğeni facebook beğeni facebook sayfa beğenisi facebook takipçi twitter takipçi twitter beğeni twitter retweet youtube izlenme youtube abone instagram

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.


Solution

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

instagram volgers kopen volgers kopen buy windows 10 pro buy windows 11 pro


Windows 10 Kaufen Windows 10 Pro Office 2019 Kaufen Office 365 Lizenz Windows 10 Home Lizenz Office 2019 Home Business Kaufen windows office 365 satın al follower kaufen instagram follower kaufen porno
Alanya escort Manavgat escort Fethiye escort Kemer escort Didim escort Çanakkale escort Aydın escort Muğla escort Tekirdağ escort Manisa escort Balıkesir escort Trabzon escort Elazığ escort Ordu escort Kütahya escort Isparta escort Rize escort Kahramanmaraş escort Yalova escort Giresun escort Yozgat escort Tokat escort Şanlıurfa escort Sivas escort Batman escort Erzurum escort Sinop escort Kırşehir escort Karaman escort Kırıkkale escort Bolu escort Amasya escort Niğde escort Uşak escort Edirne escort Çorum escort Osmaniye escort Zonguldak escort Van escort Erzincan escort Söke escort Bodrum escort Çerkezköy escort Akhisar escort Bandırma escort Ayvacık escort Akçaabat escort Karakoçan escort Altınordu escort Tavşanlı escort Eğirdir escort Ardeşen escort Afşin escort Altınova escort Bulancak escort Sorgun escort Erbaa escort Viranşehir escort Zara escort Kozluk escort Aziziye escort Ayancık escort Kaman escort Ermenek escort Keskin escort Gerede escort Göynücek escort Bor escort Banaz escort Havsa escort Osmancık escort Bahçe escort Alaplı escort Başkale escort Kemah escort Nazilli escort Fethiye escort Çorlu escort Alaşehir escort Altıeylül escort Biga escort Araklı escort Kovancılar escort Fatsa escort Simav escort Yalvaç escort Çayeli escort Dulkadiroğlu escort Çiftlikköy escort Espiye escort Sarıkaya escort Niksar escort Suruç escort Yıldızeli escort Sason escort Horasan escort Boyabat escort Mucur escort Sarıveliler escort Yahşihan escort Göynük escort Gümüşhacıköy escort Çamardı escort Eşme escort İpsala escort Sungurlu escort Hasanbeyli escort Çaycuma escort İpekyolu escort Refahiye escort Kuşadası escort Marmaris escort Süleymanpaşa escort Turgutlu escort Susurluk escort Gelibolu escort Of escort Ünye escort Domaniç escort Fındıklı escort Elbistan escort Çınarcık escort Tirebolu escort Akdağmadeni escort Turhal escort Eyyübiye escort Suşehri escort Yakutiye escort Gerze escort Mengen escort Merzifon escort Ulukışla escort Sivaslı escort Keşan escort Kadirli escort Ereğli escort Özalp escort Tercan escort Efeler escort Didim escort Çine escort Dalaman escort Menteşe escort Milas escort Ortaca escort Seydikemer escort Ergene escort Kapaklı escort Malkara escort Salihli escort Şehzadeler escort Soma escort Yunusemre escort Ayvalık escort Bigadiç escort Burhaniye escort Gönen escort Karesi escort Çan escort Yenice escort Ortahisar escort Yomra escort Perşembe escort Pazar escort Onikişubat escort Pazarcık escort Türkoğlu escort Eynesil escort Görele escort Piraziz escort Yağlıdere escort Çayıralan escort Boğazlıyan escort Zile escort Siverek escort Karaköprü escort Haliliye escort Akçakale escort Şarkışla escort Gemerek escort Oltu escort Palandöken escort Mudurnu escort Suluova escort Taşova escort Toprakkale escort Kilimli escort Tuşba escort Üzümlü escort