Java Code Examples for com.vaadin.flow.dom.Element#addPropertyChangeListener()

@Override
protected void init(VaadinRequest request) {
    Push push = getClass().getAnnotation(Push.class);

    getPushConfiguration().setPushMode(push.value());
    getPushConfiguration().setTransport(push.transport());

    Div div = new Div();
    div.setText("Just a label");
    div.setId("label");
    add(div);
    Element area = ElementFactory.createTextarea();
    area.addPropertyChangeListener("value", "change", event -> {
    });
    area.setAttribute("id", "text");
    getElement().appendChild(area);
}
 

private void addSyncWithInitialValue() {
    add(new Text("Synchronized on 'change' event with initial value"));
    final Div syncOnChangeInitialValueLabel = new Div();
    syncOnChangeInitialValueLabel.setId("syncOnChangeInitialValueLabel");
    Element syncOnChangeInitialValue = ElementFactory.createInput();
    syncOnChangeInitialValueLabel.setText("Server value on create: "
            + syncOnChangeInitialValue.getProperty("value"));
    syncOnChangeInitialValue.setAttribute("id", "syncOnChangeInitialValue");
    syncOnChangeInitialValue.addPropertyChangeListener("value", "change",
            event -> {
            });
    syncOnChangeInitialValue.addEventListener("change", e -> {
        syncOnChangeInitialValueLabel
                .setText("Server value in change listener: "
                        + syncOnChangeInitialValue.getProperty("value"));
    });
    syncOnChangeInitialValue.setProperty("value", "initial");

    getElement().appendChild(syncOnChangeInitialValue);
    add(syncOnChangeInitialValueLabel);
}
 

private void addSyncMultipleProperties() {
    add(new Text(
            "Synchronize 'value' on 'input' event and 'valueAsNumber' on 'blur'"));
    Div valueLabel = new Div();
    valueLabel.setId("multiSyncValueLabel");
    Div valueAsNumberLabel = new Div();
    valueAsNumberLabel.setId("multiSyncValueAsNumberLabel");

    Element multiSync = ElementFactory.createInput("number");
    multiSync.setAttribute("id", "multiSyncValue");
    multiSync.addPropertyChangeListener("valueAsNumber", "blur", event -> {
    });
    multiSync.addPropertyChangeListener("value", "input", event -> {
    });

    multiSync.addEventListener("input", e -> {
        valueLabel
                .setText("Server value: " + multiSync.getProperty("value"));
    });
    multiSync.addEventListener("blur", e -> {
        valueAsNumberLabel.setText("Server valueAsNumber: "
                + multiSync.getProperty("valueAsNumber"));
    });

    getElement().appendChild(multiSync);
    add(valueLabel, valueAsNumberLabel);
}
 

@Override
protected void onShow() {
    Element mainElement = getElement();
    mainElement.getStyle().set("margin", "1em");

    Element button = ElementFactory.createButton("Click me");

    Element input = ElementFactory.createInput().setAttribute("placeholder",
            "Synchronized on change event");
    input.addPropertyChangeListener("value", "change", event -> {
    });

    button.addEventListener("click", e -> {
        JsonObject eventData = e.getEventData();
        String buttonText = eventData.getString("element.textContent");
        int clientX = (int) eventData.getNumber("event.clientX");
        int clientY = (int) eventData.getNumber("event.clientY");
        Element greeting = ElementFactory.createDiv(
                "Thank you for clicking \"" + buttonText + "\" at ("
                        + clientX + "," + clientY + ")! The field value is "
                        + input.getProperty("value"));
        greeting.setAttribute("class", "thankYou");
        greeting.addEventListener("click",
                e2 -> greeting.removeFromParent());

        mainElement.appendChild(greeting);
    }).addEventData("element.textContent").addEventData("event.clientX")
            .addEventData("event.clientY");

    Element helloWorldElement = ElementFactory.createDiv("Hello world");

    Set<String> spanClasses = helloWorldElement.getClassList();

    helloWorldElement.setProperty("id", "hello-world");
    spanClasses.add("hello");
    helloWorldEventRemover = helloWorldElement.addEventListener("click",
            e -> {
                if (helloWorldElement.getText().equals("Hello world")) {
                    helloWorldElement.setText("Stop touching me!");
                } else {
                    // We never get to this code as long as the event
                    // removal actually works
                    helloWorldElement.setText(helloWorldElement.getText()
                            + " This might be your last warning!");
                }
                spanClasses.clear();
                helloWorldEventRemover.remove();
            });
    Style s = helloWorldElement.getStyle();
    s.set("color", "red");
    s.set("fontWeight", "bold");

    Element elementContainer = ElementFactory.createDiv();

    Element toRemove = ElementFactory.createDiv("To Remove")
            .setAttribute("id", "to-remove");
    elementContainer.appendChild(toRemove);

    elementContainer.setAttribute("id", "addremovecontainer");
    Element addRemoveButton = ElementFactory
            .createButton("Add and remove element");
    addRemoveButton.setAttribute("id", "addremovebutton");

    addRemoveButton.addEventListener("click", e -> {
        // very basic usecase: append and then immediately remove
        Element div = ElementFactory.createDiv("foobar");
        elementContainer.appendChild(div);
        elementContainer.removeChild(div);

        elementContainer.removeChild(toRemove);
        elementContainer.appendChild(toRemove);

        // Now let's have two "add" operation and then two "remove"
        // operation so that removal has an addition right before which
        // targets different element
        Element div2 = ElementFactory.createDiv("foobar");
        elementContainer.appendChild(div);
        elementContainer.appendChild(div2);

        Element ok = ElementFactory.createDiv("OK");
        ok.setAttribute("id", "ok");
        elementContainer.appendChild(ok);

        elementContainer.removeChild(div);
        elementContainer.removeChild(div2);
    });

    mainElement.appendChild(helloWorldElement, button, input,
            addRemoveButton, elementContainer);

}
 

private static Element createSynchronizedInput(String id) {
    Element element = ElementFactory.createInput().setAttribute("id", id);
    element.addPropertyChangeListener("value", "change", event -> {});
    return element;
}