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 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

Handle Keyboard events for iron-list in GWT?

Asked By: Anonymous

I use iron-list from google Polymer.

<iron-list items="[[data]]" as="item">
    <div tabindex$="[[tabIndex]]">
      Name: [[]]

I kwon you can use Polymer.IronA11yKeysBehavior but even with the example I have no idea how I add it in JavaScript to my iron-list.

Using Vaadin Polymer GWT lib. In this lib you have

IronList list; 
list.setKeyBindings(???);  // don't know how to use this function
list.setKeyEventTarget(????);  // don't know how to use this function

When I check the current values of the key bindings I defined a print function to log a variable to the console:

public native void print(JavaScriptObject obj) /-{

Then I print the current values with:


The result is:

Object {up: "_didMoveUp", down: "_didMoveDown", enter: "_didEnter"}

It seem that there are some key bindings already defined, but I have no idea where I find the functions _didMoveUp, _didMoveDown and _didEnter.

When I do


I get:

<iron-list class="fit x-scope iron-list-0" tabindex="1" style="overflow: auto;">

How can I set up a handler for capturing keyboard events using Vaadin Polymer GWT lib? How can I receive an event when keys like enter are pressed?


Answered By: Anonymous

answering this question

list.setKeyBindings(???); // don’t know how to use this function

according to com/vaadin/polymer/vaadin-gwt-polymer-elements/!/com/vaadin/polymer/public/bower_components/iron-list/iron-list.html:292

the keyBindings should have object of such structure:

      'up': '_didMoveUp',
      'down': '_didMoveDown',
      'enter': '_didEnter'

to construct such object, you can use following:

        new JSONObject() {{
            put("up", new JSONString("_didMoveUp"));
            put("down", new JSONString("_didMoveDown"));
            put("enter", new JSONString("_didEnter"));

I have no idea where I find the functions _didMoveUp, _didMoveDown and

they can be found here: com/vaadin/polymer/vaadin-gwt-polymer-elements/!/com/vaadin/polymer/public/bower_components/iron-list/iron-list.html:1504

here’s the extract

    _didMoveUp: function() {
      this._focusPhysicalItem(Math.max(0, this._focusedIndex - 1));

    _didMoveDown: function() {
      this._focusPhysicalItem(Math.min(this._virtualCount, this._focusedIndex + 1));

    _didEnter: function(e) {
      // focus the currently focused physical item
      // toggle selection

How can I set up a handler for capturing keyboard events using Vaadin
Polymer GWT lib?

How can I receive an event when keys like enter are

I could find this Polymer convention: properties not intended for external use should be prefixed with an underscore.

That’s the reason why they are not exposed in JsType IronListElement.
You can change this function using JSNI. I think that smth like this:

    private native static void changeDidMoveUp(IronListElement ironList) /*-{
        var _old = ironList._didMoveUp;
        ironList._didMoveUp = function() {

or add a new one

    IronListElement element ...

    com.vaadin.polymer.elemental.Function<Void, Event> func = event -> {
        return null;

    private native static void addUpdatePressed(IronListElement ironList, Function func) /*-{
        ironList._updatePressed = func;

        addUpdatePressed(element, func);
        element.addOwnKeyBinding("a", "_updatePressed");
        element.addOwnKeyBinding("shift+a alt+a", "_updatePressed");
        element.addOwnKeyBinding("shift+tab shift+space", "_updatePressed");

should work. You can get element from IronList#getPolymerElement().

keep in mind, that I haven’t tested this code 🙂

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