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HelloWorldView.java
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HelloWorldView.java
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/*
* Copyright 2000-2021 Vaadin Ltd.
*
* Licensed under the Apache License, Version 2.0 (the "License"); you may not
* use this file except in compliance with the License. You may obtain a copy of
* the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations under
* the License.
*/
package com.vaadin.flow.navigate;
import com.vaadin.flow.component.Text;
import com.vaadin.flow.component.html.NativeButton;
import com.vaadin.flow.component.html.Paragraph;
import com.vaadin.flow.component.html.Span;
import com.vaadin.flow.router.PageTitle;
import com.vaadin.flow.router.Route;
@Route(value = "hello")
@PageTitle("Hello World")
public class HelloWorldView extends Span {
public static final String NAVIGATE_ABOUT = "navigate-about";
public static final String IS_CONNECTED_ON_INIT = "is-connected-on-init";
public static final String IS_CONNECTED_ON_ATTACH = "is-connected-on-attach";
private final Span isConnectedOnInit = new Span("");
private final Span isConnectedOnAttach = new Span("");
public HelloWorldView() {
setId("hello-world-view");
NativeButton toAbout = new NativeButton("Say hello",
e -> getUI().get().navigate("about"));
toAbout.setId(NAVIGATE_ABOUT);
add(toAbout);
isConnectedOnInit.setId(IS_CONNECTED_ON_INIT);
updateIsConnected(isConnectedOnInit);
add(new Paragraph(new Text("Connected on init: "), isConnectedOnInit));
isConnectedOnAttach.setId(IS_CONNECTED_ON_ATTACH);
isConnectedOnAttach.addAttachListener(
event -> updateIsConnected(isConnectedOnAttach));
add(new Paragraph(new Text("Connected on attach: "),
isConnectedOnAttach));
}
private void updateIsConnected(Span output) {
output.getElement()
.executeJs("this.textContent=String(this.isConnected)");
}
}